3X Crank Sensor: 3 X crank sensor indicates engine
RPM based on the 3X reference signal input to the powertrain control
module (PCM).
18X Crank Sensor: 18X crank sensor indicates engine
RPM based on the 18 X reference signal input to the PCM.
1-2 Solenoid Circuit Status: 1-2 Solenoid
Circuit Status indicates the diagnostic state of the 1-2 solenoid
control circuit. The scan tool displays Fault, OK, or Invalid State.
2-3 Solenoid Circuit Status: 2-3 Solenoid
Circuit Status indicates the diagnostic state of the 2-3 solenoid
control circuit. The scan tool displays Fault, OK, or Invalid State.
A/C High Side Pressure Sensor: Scan tool displays 0.00-5.00 volts.
Represents the A/C refrigerant pressure sensor signal. The amount of pressure
indicates the amount of load that the A/C compressor is
placing on the engine. The PCM uses this information to
adjust idle and to control the cooling fans.
A/C Off For WOT: Scan tool displays YES or NO. Indicates
whether A/C is commanded OFF due to wide open throttle (WOT).
A/C Pressure Disable: Scan tool displays YES or NO.
Indicates whether A/C is commanded OFF due to excessive or insufficient pressure.
A/C Relay Command: Scan tool displays On or Off. Indicates
intended PCM output to the A/C relay.
A/C Relay Circuit Status: Scan tool displays OK, Fault,
or Invalid State. Indicates the diagnostic state of the A/C relay control
circuit.
Air Fuel Ratio: Scan tool range 0.0-25.5. Air
fuel ratio indicates the PCM commanded value. In Closed Loop, Air Fuel
Ratio should normally be around 14.2-14.7. A lower
air fuel ratio indicates a richer commanded mixture, which may
be seen during power enrichment (PE) or 3-way catalytic converter
(TWC) protection modes. A higher air fuel ratio indicates
a leaner commanded mixture. This can be seen during Decel
Fuel Mode.
AIR Pump Relay Command: AIR Pump Relay Command indicates
the commanded state of the secondary air injection (AIR) pump relay. The
scan tool displays ON or OFF.
AIR Pump Relay Circuit Status: AIR Pump Relay Circuit
Status indicates the diagnostic state of the output driver for the AIR pump
relay control circuit. The scan tool displays Fault, OK or Invalid
State.
AIR Solenoid Command: AIR Solenoid Command indicates
the commanded state of the AIR solenoid. The scan tool displays On or Off.
AIR Solenoid Circuit Status: AIR Solenoid Circuit Status
indicates the diagnostic state of the output driver for the AIR solenoid
control circuit. The scan tool displays Fault, OK or Invalid State.
BARO: Scan tool range 10-105 kPa/0.00-5.00 volts.
The barometric pressure (BARO) reading is determined from the manifold
absolute pressure (MAP) sensor signal monitored during
key up and WOT conditions. BARO is used to adjust fuel
delivery and spark advance to compensate for altitude
changes.
Boost Solenoid Circuit Status: Boost Solenoid Circuit
Status indicates the diagnostic state of the output driver for the boost
solenoid control circuit. The scan tool displays Fault, OK or Invalid
State
Boost Solenoid Command: Boost Solenoid Command indicates
the commanded state of the boost solenoid. The scan tool displays percent.
CMP Sensor Signal Present: Camshaft position (CMP) Sensor
Signal Present indicates if the PCM is receiving the cam sensor reference
signal from the ignition control module (ICM). The scan tool displays
Yes or No.
Cruise Control Active: Scan tool displays ENGAGED or
DISENGAGED. Represents the state of the cruise Status Input from the SMCC
module. Cruise should not display ENGAGED unless the vehicle
is operating in cruise control.
Cruise Inhibit Reason: Scan tool displays vehicle speed,
brake, or clutch. Indicates reason cruise is being inhibited.
Cruise Inhibit Signal Circuit Status: Cruise Inhibit
Signal Circuit Status indicates the diagnostic state of the output driver
for the cruise inhibit signal circuit. The scan tool displays Fault,
OK or Invalid State.
Cruise Inhibit Signal Command: Cruise Inhibit Signal
Command indicates if cruise is being inhibited. The scan tool displays Yes
or No.
Current Gear: Scan tool displays numbers 1, 2, 3, or
4. The PCM looks at trans range position and the gear commanded by the
PCM. The actual forward gear that the transaxle is in
will be the lower of the two because the manual valve can
override the PCM commanded gear.
Cycles of Misfire Data: Scan Tool Range--0-99 Counts.
Indicates the total number of cylinder firing events that were detected
as being misfires during the last 200 crankshaft revolution sample period.
Cyl. 1-6 Injector Circuit History: Scan Tool Displays--Fault
or OK
This parameter saves the state of the driver circuit for this device.
Cyl. 1-6 Injector Circuit Status: Scan Tool Displays--Fault
or OK
This parameter indicates the state of the driver circuit for this device.
Decel Fuel Cutoff: Scan tool displays ACTIVE or INACTIVE.
ACTIVE displayed indicates that the PCM has detected conditions appropriate
to operate in Deceleration Fuel Mode. The PCM will command
deceleration fuel mode when a sudden decrease in throttle
position has been detected while the vehicle is traveling
over 40 km/h (25 mph). While in Deceleration Fuel mode,
the PCM will decrease the amount of fuel delivered by entering
Open Loop and decreasing the injector pulse width.
Desired EGR Position: Scan tool displays volts or a
range from 0-100 percent. Represents the exhaust gas recirculation
(EGR) pintle position that the PCM is commanding. Desired EGR Position
should stay close to EGR position sensor.
Desired Idle Speed: Scan tool range 0-3187 RPM.
Represents the idle speed that is commanded by the PCM. The PCM will compensate
for various engine loads based on engine coolant temperature
(ECT) to keep the engine at the desired idle speed.
Driver Module 1 Status: Driver Module 1 Status
indicates the diagnostic state of the module. The scan tool displays Enabled,
Off-High Volts, Off-High Temp, or Invalid State.
Driver Module 2 Status: Driver Module 2 Status
indicates the diagnostic state of the module. The scan tool displays Enabled,
Off-High Volts, Off-High Temp, or Invalid State.
Driver Module 3 Status: Driver Module 3 Status
indicates the diagnostic state of the module. The scan tool displays Enabled,
Off-High Volts, Off-High Temp, or Invalid State.
Driver Module 4 Status: Driver Module 4 Status
indicates the diagnostic state of the module. The scan tool displays Enabled,
Off-High Volts, Off-High Temp, or Invalid State.
ECT Sensor: Scan tool range -40 to +151°C
(-40 to +304°F). The engine coolant temperature (ECT) sensor
is mounted in the coolant stream. The PCM applies 5 volts
to the ECT sensor circuit. The sensor is a thermistor
which changes internal resistance as temperature changes.
When the sensor is cold, the internal resistance is high, the
PCM monitors a high signal voltage and interprets the higher
voltage as a cold engine. As the sensor warms, the internal
resistance decreases, the voltage signal decreases and the
PCM interprets the lower voltage as a warm engine.
EGR Flow Test Count: Scan tool range 0-255. Indicates
the number of EGR flow test samples collected during the current ignition
cycle. The maximum number of samples allowed is 1 during
normal operation. If the PCM battery feed has been disconnected
or a DTC P0401 has been cleared, several EGR flow
test samples will be allowed during the next ignition cycle.
This is to allow repair verification during a single ignition
cycle.
EGR Learned Minimum Position: Scan tool range 0.0-5.0 volts.
Represents the learned voltage that the PCM uses to determine whether or
not the EGR valve is fully closed, 0 percent pintle position. If
the Desired EGR Position is 0 percent and a difference
of more than 0.4 volt between EGR Feedback and EGR Closed
Valve Pintle Position is detected, DTC P1406 will
set.
EGR Position Sensor: Scan tool range 0.00-5.00 volts.
Indicates the EGR pintle position sensor signal voltage being monitored
by the PCM. A low voltage indicates a fully extended pintle,
closed valve, a voltage near 5 volts indicates a
fully retracted pintle, open valve.
EGR Position Sensor: Scan tool range 0-100 percent.
Represents the actual position of the EGR pintle in percent. 0 percent
displayed indicates a fully extended pintle, the EGR valve
is closed.
EGR Position Variance: Scan tool range 0-100
percent. Indicates the difference between Desired EGR Position and Actual
EGR Position currently being monitored by the PCM. If
the EGR Position Variance reaches an unacceptable level, DTC P1406
will set.
EGR Solenoid Command: Scan tool range 0-100 percent.
Represents the EGR valve driver pulse width modulation (PWM) signal from
the PCM. A duty cycle of 0 percent indicates that no EGR flow
is being commanded, a 100 percent duty cycle indicates
maximum EGR flow commanded.
EGR Solenoid Circuit History: Scan Tool Displays--Fault
or OK
This parameter saves the state of the driver circuit for this device.
EGR Solenoid Circuit Status: EGR Solenoid Circuit Status
indicates the diagnostic state of the output driver for the EGR solenoid
circuit. The scan tool displays Fault, OK or Invalid State.
Engine Load: Scan tool range 0-100 percent.
Engine load is calculated by the PCM from engine speed and mass air flow
(MAF) sensor readings. Engine load should increase with
an increase in RPM or air flow.
Engine Oil Level Switch: Scan tool displays OK or LOW.
Indicates the oil level as determined by the engine oil level switch.
Engine Oil Life Remaining: Scan tool range 0-100 percent.
Indicates the engine oil life index. The PCM calculates engine oil life
based upon the number of engine revolutions seen and operating
conditions such as calculated oil temperature. Pressing
the Oil Life Monitor reset switch will return the displayed Engine
Oil Life to 100 percent.
Engine Oil Pressure Switch: Engine oil pressure switch
indicates the state of the switch. The scan tool displays Low or OK.
Engine Run Time: Scan tool range 00:00:00-99:99:99 Hrs:Min:Sec.
Indicates the time elapsed since the engine was started. If the engine
is stopped, ENGINE RUN TIME will be reset to 00:00:00.
Engine Speed: Scan tool range 0-9999 RPM.
Engine speed is computed by the PCM from the 3 X reference input.
The engine speed should remain close to desired idle under
various engine loads with engine idling
EVAP Fault History: Scan Tool displays No Fault, Excess
Vacuum, Purge Valve Leak, Small Leak, Weak Vacuum or No Test Result.
EVAP Purge Solenoid Circuit Status: Evaporative emission
(EVAP) Purge Solenoid Circuit Status indicates the diagnostic state of the
output driver for the EVAP purge solenoid circuit. The scan tool displays
Fault, OK or Invalid State.
EVAP Purge Solenoid Command: Scan tool range 0-100 percent
Represents the PCM commanded PWM duty cycle of the EVAP purge valve. 0 percent
displayed indicates no purge. 100 percent displayed
indicates full purge.
EVAP Test Abort Reason: EVAP Test Abort Reason indicates
the reason that the EVAP test was aborted. Scan Tool displays Excess Vacuum,
Purge Valve Leak, Small Leak, or Weak Vacuum.
EVAP Test Result: Scan Tool Displays--No Results,
Passed, Aborted, Fail DTC P0440, Fail DTC P0442, Fail DTC P0446,
Fail DTC 1441.
This information can be used to check system operation. This parameter
displays the results of the EVAP system diagnostic tests.
EVAP Test State: Scan Tool Displays-- Test Completed,
Test Running, Wait for Purge .
Indicates the current status of the EVAP diagnostic routine.
EVAP Vent Solenoid Circuit Status: EVAP Vent Solenoid
Circuit Status indicates the diagnostic state of the output driver for the
EVAP vent solenoid circuit. The scan tool displays Fault, OK or Invalid
State.
EVAP Vent Solenoid Command: Scan tool range 0-100 percent
Represents the PCM commanded PWM duty cycle of the EVAP vent valve. 0 percent
displayed indicates no purge. 100 percent displayed
indicates full purge.
FC Relay 1 Circuit Status: FC Relay 1 Circuit
Status indicates the diagnostic state of the output driver for the FC relay 1
circuit. The scan tool displays Fault, OK or Invalid State.
FC Relay 1 Command: FC relay 1 Command indicates
the commanded state of the FC relay 1. The scan tool displays ON or
OFF.
FC Relay 2 and 3 Circuit Status: FC Relay 2 and
3 Circuit Status indicates the diagnostic state of the output driver for
the FC relay 2 and 3 circuits. The scan tool displays Fault,
OK or Invalid State.
FC Relay 2 and 3 Command: FC Relay 2 and 3 Command
indicates the commanded state of the FC relays 2 and 3. The scan tool
displays ON or OFF.
Fuel Pump Relay Circuit Status: Fuel Pump Relay Circuit
Status indicates the diagnostic state of the output driver for the fuel pump
relay control circuit. The scan tool displays Fault, OK or Invalid
State.
Fuel Pump Relay Circuit History Status: The scan tool
displays Fault or OK
This parameter indicates the state of the driver circuit for this device.
Fuel Pump Relay Command: Scan tool displays ON or OFF.
Indicates the PCM commanded state of the fuel pump relay control circuit.
Fuel Tank Level Remaining: Fuel Tank Level Remaining
indicates the level of fuel remaining in the fuel tank. The scan tool displays
percent.
Fuel Tank Pressure Sensor: Scan Tool Displays--0-5 volts, -32.69
to +014.01 mm Hg, or -17.5 to +7.5 in of H2O
Fuel tank pressure (FTP) is used extensively for EVAP purge control
and EVAP system diagnostics.
Fuel Trim Cell: Scan tool range 0- 9 fuel trim
cell is dependent upon engine speed and MAF sensor readings. A plot of
RPM vs. MAF is divided into 10 cells. Fuel trim cell indicates
which cell is currently active.
Fuel Trim Learn: Scan tool displays NO or YES. When
conditions are appropriate for enabling long term fuel trim corrections,
FUEL TRIM LEARN will display yes. This indicates that
the long term FT is responding to short term fuel trim.
If the Fuel Trim Learn displays NO, the long term FT will
not respond to changes in short term FT.
Gen F-Terminal Signal: Scan tool range 0-100 percent.
Represents the field terminal input from the generator. The field PWM duty
cycle indicates generator output level; a higher duty
cycle indicates a higher generator output. The PCM uses the
generator F terminal signal to adjust spark and idle air control
(IAC) to compensate for variances in engine load caused
by the generator.
Gen L-Terminal Signal Command: Scan tool displays ON
or OFF. OFF displayed indicates that the PCM has commanded the generator
control circuit OFF.
HO2S 1: Scan tool range 0-1,132 mV. Represents
the fuel control exhaust oxygen sensor (O2S) output voltage. Should fluctuate
constantly within a range between 10 mV, lean exhaust,
and 1,000 mV, rich exhaust, while operating in Closed
Loop.
HO2S 2: Scan tool range 0-1,132 mV. Represents
the catalyst monitor exhaust O2S output voltage. If the catalyst is operating
efficiently, the heated oxygen sensor (HO2S) 1
signal will be far more active than that produced by the HO2S 2
sensor. If the PCM detects a level of HO2S 2 activity
that indicates the catalyst is no longer operating efficiently,
DTC P0420 will be set.
IAC Position: Range 0-255. Displays the commanded
position of the idle air control (IAC) pintle in counts. A larger number
of counts means that more air is being commanded through
the idle air passage. IAC position should respond fairly
quickly to changes in engine load to maintain desired idle RPM.
IAT Sensor: Scan tool range -40 to +151°C
(-40 to +304°F). The PCM converts the resistance of the intake
air temperature (IAT) sensor to degrees. The PCM uses IAT
to adjust fuel delivery and spark timing according to
incoming air density. IAT is also compared to ECT at startup
to identify cold starts for the HO2S heater and the EVAP
diagnostics.
Ignition 1 Signal: Scan tool range 0-25.5 volts.
Represents the system voltage measured by the PCM at its ignition feed.
Ignition Mode: Scan tool displays BYPASS or IC. Indicates
the commanded state of the Bypass signal output from the PCM. When BYPASS
is displayed, the ignition control module (ICM) is controlling
the spark advance at a fixed 10 degrees before top dead center
(BTDC), bypass mode. IC displayed indicates that the PCM has requested
control of the spark advance, IC mode. The ICM determines
the correct operating mode based on the level of voltage
that the PCM applies to the ICM bypass circuit. The PCM provides
5 volts to the ICM bypass circuit when conditions
are appropriate for PCM control of spark timing, IC mode.
If the PCM does not apply 5 volts to the bypass circuit,
or if the ICM does not receive the voltage , the module will
control spark timing.
Injector PWM: Injector PWM indicates the commanded PWM
of the fuel injectors. The scan tool displays milliseconds.
Knock Retard: Scan tool range 0.0-25.5 degrees.
Indicates the amount of spark the PCM is removing from the IC spark advance
in response to the signal from the knock sensors (KS).
The traction control system Desired Torque signal from
the electronic brake and traction control (EBTCM) may cause knock retard
to display a value more than 0.0 degrees if traction
control is active.
Long Term FT: Scan tool range -23 to +16 percent.
Long term FT is derived from the short term FT value and represents a long-term
correction of fuel delivery. A value of 0 percent
indicates that fuel delivery requires no compensation to
maintain the PCM commanded air/fuel ratio. A negative value significantly
below 0 percent indicates that the fuel system is rich
and fuel delivery is being reduced, decreased injector pulse
width. A positive value significantly more than 0 percent
indicates that a lean condition exists and the PCM is compensating
by adding fuel, increased injector pulse width. Because
long term fuel trim tends to follow short term FT, a value in
the negative range due to canister purge at idle should
not be considered unusual. The PCMs maximum authority to control
Long term FT allows a range between -23 and +16 percent.
Fuel trim values at or near maximum authority may indicate
an excessively rich or lean system.
Loop Status: Scan tool displays OPEN or CLOSED. Closed
Loop indicates that the PCM is controlling fuel delivery according to O2S
voltage. In Open Loop, the PCM ignores the O2S voltage
and bases the amount of fuel to be delivered on TP, ECT,
and MAF sensor inputs only.
Low Oil Lamp Circuit Status: Low Oil Lamp Circuit Status
indicates the diagnostic state of the output driver for the low oil lamp
control circuit. The scan tool displays Fault, OK or Invalid State.
Low Oil Lamp Command: Low Oil Lamp Command indicates
the commanded state of the low oil lamp. The scan tool displays On or Off.
MAF Sensor: Scan tool range 0.0-512 gm/s.
Mass air flow (MAF) is the MAF Input frequency converted to grams of air
per second. This indicates the amount of air entering
the engine.
MAF Sensor: Scan tool range 0-32,000 Hz.
The MAF sensor input signal to the PCM is a frequency which varies from
around 3,000 Hz at idle to above 7,000 Hz
at WOT. The PCM converts this frequency signal to grams
per second to be displayed on the scan tool as MAF.
MAP Sensor: Scan tool range 10-105 kPa/0.00-
4.97 volts. The manifold absolute pressure (MAP) sensor measures
the change in the intake manifold pressure from engine
load, EGR flow, and speed changes. As intake manifold
pressure increases, intake vacuum decreases resulting in a higher
MAP sensor voltage and kPa reading. The MAP sensor signal
is used to monitor intake manifold pressure changes during
the EGR flow test, to update the BARO reading, and as an
enabling factor for many of the diagnostics.
MIL Command: Scan tool displays ON or OFF. Indicates
the PCM commanded state of the malfunction indicator lamp (MIL).
MIL Circuit Status: MIL Circuit Status indicates the
diagnostic state of the output driver for the MIL circuit. The scan tool
displays Fault, OK or Invalid State.
Misfire Current Cyl. 1-6: Scan tool range 0-198 Counts.
The Misfire Current counters indicate the number of cylinder firing events
detected as possible misfires on each cylinder during
the last 200 crankshaft revolutions. The number that the
counters display are twice the actual number of misfire
events detected. The counters may normally display some activity,
but the activity should be very low and nearly equal for
all the cylinders.
Misfire History Cyl. 1-6: Scan tool range 0-65535 Counts.
The Misfire History counters indicate the total level of misfire that has
been detected on each cylinder. The number that the counters
display are twice the actual number of misfire events detected.
The Misfire History counters will not update or show any
activity until a misfire DTC P0300 has become active.
The Misfire History counters will be updated every time
a 200 crankshaft revolution misfire test failure is detected.
Number of DTC(s): Scan Tool Displays-- number
This parameter displays the quantity of active DTCs.
PCM/VCM in VTD Fail Enable: Scan Tool Displays--ACTIVE
or INACTIVE.
If applicable. The theft deterrent fuel enable is an input from the
vehicle theft deterrent (VTD) system that signals the PCM to enable
the injectors and the crank relay if the proper signal
is received. The scan tool will normally display INACTIVE.
If the VTD system does not send the correct theft deterrent
fuel enable signal to the PCM, the display will switch
to ACTIVE and the fuel system and starter control may be
disabled. Refer to VTD diagnosis for further information.
Power Enrichment: Scan tool displays ACTIVE or INACTIVE.
ACTIVE displayed indicates that the PCM has detected conditions appropriate
to operate in power enrichment (PE) mode. The PCM will
command PE mode when a large increase in TP and load is
detected. While in PE, the PCM will increase the amount
of fuel delivered by entering Open Loop and increasing
the injector pulse width. This is done to prevent a possible
sag or hesitation from occurring during acceleration.
Short Term FT: Scan tool range -11 to +20 percent.
Short term FT represents a short-term correction to fuel delivery by the
PCM in response to the amount of time the fuel control
O2S voltage spends above or below the 450 mV threshold.
If the O2S voltage has mainly remained less than 450 mV,
indicating a lean air/fuel mixture, short term FT will
increase into the positive range above 0 percent and the
PCM will add fuel. If the O2S voltage stays mainly above
the threshold, short term fuel trim will decrease below
0 percent into the negative range while the PCM reduces
fuel delivery to compensate for the indicated rich condition.
Under certain conditions such as extended idle and high
ambient temperatures, canister purge may cause short term
FT to read in the negative range during normal operation.
The PCMs maximum authority to control fuel trim allows
a range between -11 to +20 percent. Fuel trim values at
maximum authority may indicate an excessively rich or lean
system.
Spark: Scan tool range -64 to +64 degrees. displays
the spark timing being commanded by the PCM on the IC circuit. A negative
(-) value indicates degrees before top dead center
(BTDC) or spark advance; a positive value indicates degrees
after top dead center (ATDC) or spark retard. Because the
ICM sets spark advance at a fixed value of 10 degrees
BTDC while operating in bypass mode, the displayed Spark advance
only reflects true spark timing when the PCM has commanded
IC mode.
Starter Enable Relay Circuit Status: Starter Enable
Relay Circuit Status indicates the diagnostic state of the output driver
for the starter enable relay control circuit. The scan tool displays
Fault, OK or Invalid State.
Starter Relay Command: Scan tool displays ON or OFF.
A Disabled display indicates that the PCM has inhibited starter relay operation.
The PCM will inhibit starter relay operation if the engine
is running, a correct VTD password has not been received
from the VTD module or if the starter is engaged for an extended
period of time.
Start-Up ECT: Scan tool range -40 to +151°C
(40 to +304°F). Indicates the ECT at the time that the vehicle
was started. Used by the HO2S diagnostic to determine
if the last startup was a cold start.
Start-Up IAT: Scan tool range -40 to +151°C
(-40 to +304°F). Indicates the IAT at the time that the vehicle
was started. Used by the HO2S diagnostic to determine
if the last startup was a cold start.
TCC Brake Pedal Switch: Torque control converter (TCC)
brake pedal switch indicates the state of the switch. The scan tool displays
Applied or Released.
TCC PWM Solenoid Command: TCC PWM Solenoid Command indicates
the commanded PWM signal to the solenoid. The scan tool displays Hz.
TCS Circuit Status: Traction control system (TCS) Circuit
Status indicates the diagnostic state of the output driver for the TCS circuit.
The scan tool displays Fault, OK or Invalid State.
TCS Circuit History: Scan Tool Displays--Fault
or OK
This parameter saves the state of the driver circuit for this device.
TFP Switch: Scan Tool Displays--PARK/NEUTRAL,
REVERSE, DRIVE 4, DRIVE 3, DRIVE 2, or LOW. The transmission fluid pressure
(TFP) switch represents the decoded status of the four inputs from the
internal transaxle fluid pressure switch assembly. The combination of
these inputs indicates the position of the transaxle manual valve.
TP Sensor: Scan tool range 0-100 percent.
TP angle is computed by the PCM from the throttle position (TP) sensor
voltage. TP angle should display 0 percent at idle and 100 percent
at wide open throttle.
TP Sensor: Scan tool range 0.00-5.00 Volts.
The voltage being monitored by the PCM on the TP sensor signal circuit.
Traction Control Status (If Equipped): Scan tool displays
ACTIVE or INACTIVE. ACTIVE displayed indicates that the traction control
system is taking action to reduce drive wheel slippage.
Torque Request Signal (If Equipped): Scan tool range
0-100 percent. Represents the PWM signal from the electronic
brake and traction control module. The EBTCM reduces the Traction
Control Desired Torque signal pulse width when a drive
wheel slippage situation is detected. The PCM monitors
the Traction Control Desired Torque signal and reduces drive
wheel slippage as necessary by retarding spark timing,
decreasing boost solenoid PWM, or increasing air/fuel ratio. The
PCM can also turn OFF up to 3 fuel injectors if
the Traction Control Desired Torque signal indicates a
large enough amount of drive wheel slippage. A problem with
the Traction Control Desired Torque signal should cause DTC P1571
to set.
Torque Delivered Signal (If Equipped): Scan tool range
0-100 percent. Represents the PWM signal which indicates the
percent of available torque the engine is delivering to the drive
wheels. The EBTCM monitors the Traction Control Torque
signal to ensure that the PCM is responding properly to
the Traction Control Desired Torque signal.
Vehicle Speed Sensor: Scan tool range 0-255 km/h,
0-155 mph. The vehicle speed sensor (VSS) signal is converted
into km/h and mph for display.
VTD Auto. Learn Timer: Scan Tool Displays--ACTIVE
or INACTIVE.
The auto learn timer is the indication if the VTD system is in the learn
mode and has not timed out.
VTD Fuel Disable: Scan Tool Displays--ACTIVE or
INACTIVE.
If applicable. The theft deterrent fuel enable is an input from the
VTD system that signals the PCM to enable the injectors
and the crank relay if the proper signal is received. The scan
tool will normally display INACTIVE. If the VTD system
does not send the correct theft deterrent fuel enable signal
to the PCM, the display will switch to ACTIVE and
the fuel system and starter control may be disabled. Refer to
VTD diagnosis for further information.
VTD Fuel Disable Until Ign. OFF: Scan Tool Displays--Yes
or NO
With the ignition ON and a VTD code present, the scan tool displays
Yes.