Step
| Action
| Values
| Yes
| No
|
1
| Was
the Powertrain OBD System Check performed?
| --
|
Go to Step 2
| Go to
Powertrain On Board Diagnostic (OBD) System Check
|
2
|
Important: : Visually/physically inspect for the following conditions:
• | Loose or missing fuel fill cap. |
Is
DTC P1676 Evaporative Emission (EVAP) Purge Solenoid Control Circuit
or
DTC P1665 Evaporative Emission (EVAP) Vent Solenoid Control Circuit
also set?
| --
| Go to the other DTC first
|
Go to Step 3
|
3
|
- Ignition switch OFF.
- Remove the EVAP canister line from the EVAP canister purge valve.
This will relieve the fuel tank pressure.
- Ignition switch ON, Engine OFF.
- Observe Fuel Tank Pressure on the scan tool.
Is the Fuel Tank Pressure near the specified value?
| 0 in.
H2O
|
Go to Step 4
|
Go to Step
15
|
4
|
Important: : Before continuing with diagnosis, zero the EVAP Pressure and Vacuum
(inches of H2O) gauges on the J 41413
EVAP Pressure/Purge Diagnostic Station.
Important:: Do not exceed the pressure in the specified value .
- Ignition Switch OFF.
- Reconnect all EVAP hardware that was previously disconnected.
- Install theJ 41415-40
Fill Tank Cap Adaptor to the fuel fill neck and fuel fill cap.
- Connect the EVAP Station to the Fuel Tank Cap Adaptor.
- Ignition Switch ON, Engine Off.
- Capture Fail Record data for DTC P0440 and clear DTCs.
- Using the scan tool, EVAP Purge/Seal, select seal option to seal
the EVAP System.
- Attempt to pressurize the system to the specified value by slowly
turning the EVAP Service Station rotary switch to the PRESSURE position.
(Monitor the pressure with the gauge on the cart with the rotary switch
to the OFF/HOLD position).
- Observe Fuel Tank Pressure on the scan tool.
Is the Fuel Tank Pressure near the specified value?
| 5 in.
H2O
|
Go to Step 5
|
Go to Step
7
|
5
|
Important: Do not exceed the pressure in the specified (higher) value
- Increase pressure to the first specified (higher) value
by slowly turning the EVAP Service Station rotary switch to the PRESSURE
position. (Monitor the pressure with the gauge on the cart with
the rotary switch in the OFF/HOLD position)
Does the EVAP Pressure decrease to less than the second specified (lower)
value within 2 minutes with the rotary switch in the OFF/HOLD
position?
| 15 in. H2O
10 in. H2O
|
Go to Step
6
| Go to Diagnostic Aids
|
6
|
- Disconnect the fuel tank vapor line and the EVAP purge line from
the EVAP canister.
- Block the canister fitting for the fuel tank vapor line.
- Connect a hand vacuum pump to the canister port for the EVAP
purge line.
- Ensure that the EVAP System is still sealed with the Tech II.
- Attempt to apply vacuum to the EVAP canister. The EVAP canister
is large and may take time to achieve specified level.
Can vacuum be maintained at the specified value?
| 5 in. Hg
|
Go to Step 9
|
Go to Step 8
|
7
|
- Visually/physically check for the following conditions:
• | Restricted fuel tank vapor line. |
• | Restricted EVAP purge line. |
- If a problem is found, repair as necessary.
Was a problem found?
| --
|
Go to Step 16
| Go to
DTC P0452 Fuel Tank Pressure Sensor Circuit Low Voltage
|
8
|
- Visually/physically check for the following conditions:
• | Damaged Fresh Air Vent Hose. |
• | Damaged EVAP canister . |
- If a problem is found, repair as necessary.
Was a problem found?
| --
|
Go to Step 16
|
Go to Step 13
|
9
|
- Visually/physically check for the following conditions:
• | Leaking fuel tank vapor line. |
• | Damaged EVAP purge line. |
- If a problem is found, repair as necessary.
Was a problem found?
| --
|
Go to Step 16
|
Go to Step 10
|
10
|
- Disconnect the engine vacuum Purge line from the EVAP canister
purge valve.
- Connect the EVAP Service Station (Hg) Vacuum Gauge to the Purge
Valve/Solenoid, canister side.
- Ignition switch ON, Engine Off
- Using the scan tool, EVAP Purge/Seal, Select the seal option to
seal the EVAP System.
- Start the engine and idle.
- Run the engine from 1200 -1500 RPM and observe vacuum
level.
Is vacuum level near the specified value?
| 0 in. Hg
|
Go to Step 12
|
Go to Step 11
|
11
|
Is the action complete?
| --
|
Go to Step 16
| --
|
12
|
Important: Do not exceed the 15 inch H2O pressure in the specified value.
- Reconnect all EVAP hardware that was previously disconnected.
- Using the scan tool, EVAP Purge/Seal, select Seal Option to seal
the EVAP System.
- With the EVAP pressure/purge diagnostic station connected to
the EVAP service port, continuously attempt to pressurize the EVAP system
to the specified value by leaving the EVAP pressure/purge diagnostic
station control knob in the pressurize position
- Using the ultrasonic leak detector J 41416, locate and
repair leak in EVAP system. It may be necessary to partially lower the fuel
tank to examine the top tank connections.
- Replace the faulty parts.
Is the action complete?
| 15 in. H2O
|
Go to Step 16
| --
|
13
|
- Replace the EVAP Vent Valve/Solenoid. Refer to EVAP Vent Valve Replacement
.
Is the action complete?
| --
|
Go to Step 16
| --
|
14
|
- Check for a kinked or restricted canister purge line between the
EVAP canister purge valve and EVAP canister.
- Repair the canister purge as necessary.
Is action complete?
| 0 in. H2O
|
Go to Step 16
| --
|
15
|
- Ignition switch OFF.
- Remove the EVAP canister line from the fuel tank or EVAP canister.
This will relieve the fuel tank pressure.
- Ignition switch ON, Engine OFF.
- Observe Fuel Tank Pressure on the scan tool.
Is the Fuel Tank Pressure near the specified value?
| 0 in.
H2O
|
Go to Step 14
| Go to
DTC P0453 Fuel Tank Pressure Sensor Circuit High Voltage
|
16
|
Important:: Do not exceed the pressure in the specified value .
- Reconnect all EVAP hardware that was previously disconnected.
- Ignition switch On, Engine Off.
- Using scan tool, Purge/Seal, select the seal option to seal the
EVAP System.
- Pressurize the system to the first specified (higher) value by
slowly turning the EVAP Service station rotary switch to the PRESSURE position.
(Monitor the pressure with the gauge on the cart with the rotary
switch in the OFF/HOLD position).
Does the EVAP pressure decrease to less than the second specified (lower)
value within 2 minutes with the rotary switch in the OFF/HOLD position?
| 15 in. H2O
10 in. H2O
|
Go to Step
3
| System OK
|