Circuit Description
The throttle position (TP) sensor is mounted on the throttle body/TAC assembly. The sensor is actually two individual throttle position sensors within one housing. Two separate signal, ground and reference circuits are used in order to connect the TP sensor assembly and the throttle actuator control (TAC) module. The TP sensor signal voltage increases as the throttle opens. The signal circuit for TP Sensor is pulled up to reference voltage.
Conditions for Running the DTC
| • | DTCs P0606, P1517, P1518 are not set. |
| • | The ignition switch is in the crank or run position. |
| • | The ETC serial data is operational. |
Conditions for Setting the DTC
TP sensor 1 voltage is less than 0.34 volts or more than 4.4 volts as observed on the scan tool.
Action Taken When the DTC Sets
| • | The PCM will illuminate the malfunction indicator lamp (MIL) during the first trip in which the diagnostic runs and fails. |
| • | If equipped with traction control, the PCM will command the EBTCM via the serial data circuit to turn OFF traction control and illuminate the TRACTION OFF lamp. |
| • | The PCM will store conditions which were present when the DTC set as Freeze Frame/Failure Records data. |
Conditions for Clearing the MIL/DTC
| • | The PCM will turn OFF the malfunction indicator lamp (MIL) during the third consecutive trip in which the diagnostic has run and passed. |
| • | The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction. |
| • | The DTC can be cleared by using a scan tool. |
Diagnostic Aids
When the TAC module detects a problem within the ETC System the PCM receives a message across serial data and more than one ETC System related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing one individual problem may correct more than one DTC. Keep this in mind when reviewing captured DTC info.
Inspect for the following:
Many situations may lead to an intermittent condition. Perform each inspection or test as directed.
Important: : Remove any debris from the connector surfaces before servicing a component. Inspect the connector gaskets when diagnosing or replacing a component. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion.
| • | Loose terminal connection |
| - | Use a corresponding mating terminal to test for proper tension. Refer to Testing for Intermittent Conditions and Poor Connections , and to Connector Repairs in Wiring Systems for diagnosis and repair. |
| - | Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and faulty terminal to wire connection. Refer to Testing for Intermittent Conditions and Poor Connections , and to Connector Repairs in Wiring Systems for diagnosis and repair. |
| • | Damaged harness--Inspect the wiring harness for damage. If the harness inspection does not reveal a problem, observe the display on the scan tool while moving connectors and wiring harnesses related to the sensor. A change in the scan tool display may indicate the location of the fault. Refer to Wiring Repairs in Wiring Systems for diagnosis and repair. |
| • | Inspect the powertrain control module (PCM) and the engine grounds for clean and secure connections. Refer to Wiring Repairs in Wiring Systems for diagnosis and repair. |
If the condition is determined to be intermittent, reviewing the Snapshot or Freeze Frame/Failure Records may be useful in determining when the DTC or condition was identified.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | ||
2 |
Important: If the code does not set this ignition, refer to Diagnostic Aids.
Does the scan tool indicate YES? | -- | ||
3 |
Does the scan tool indicate voltage at or near the specified value throughout throttle travel? | 1 V | ||
4 | Does scan tool indicate voltage below the specified value throughout throttle travel? | 1 V | ||
5 |
Does the scan tool indicate voltage at or near the specified value when the TAC is disconnected? | 5 V | ||
6 |
Does the voltage measure within the specified range? | 3.9-4.6V | ||
7 |
Does the scan tool indicate voltage at the specified value when the test lamp is installed? | 0V | ||
8 |
Does the scan tool indicate voltage at the specified value when the test lamp is installed? | 0V | ||
9 | Did the test lamp illuminate when the it was connected between the signal circuit and ground? | -- | ||
10 |
Does the voltage measure within the specified range? | 3.9-4.6V | ||
11 | Inspect the ELEC THROT CONT and TCS BATT fuses. Are the fuses OK? | -- | ||
12 |
Does the test lamp illuminate when probing the feed circuits? | -- | Go to DTC P1515 Control Module Throttle Actuator Position Performance or DTC P1516 Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance | |
13 | Test the signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||
14 | Test the return circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||
15 | Test the signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||
16 | Test the signal circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||
17 | Test the reference circuit for an open or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||
18 | Test the reference circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||
19 | Repair the short to ground in the feed circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |
20 | Repair the open in the feed circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |
21 | Test the return circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||
22 | Test for continuity between the reference circuit in the TAC and ground. Refer to Circuit Testing in Wiring Systems. Is continuity indicated? | -- | ||
23 | Inspect for a poor connection at the TAC. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||
24 | Replace the throttle body/TAC assembly. Refer to Throttle Body Assembly Replacement . Did you complete the replacement? | -- | -- | |
25 | Inspect for a poor connection at the TAC module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||
26 | Replace the TAC module. Refer to Accelerator Pedal Replacement . Did you complete the replacement? | -- | -- | |
27 |
Does the DTC reset? | -- | ||
28 | Does the scan tool display any DTCs that you have not diagnosed? | -- | Go to applicable DTC | System OK |
