Jeep XJ. Manual — part 842
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the Evap Purge Solenoid harness connector.
Disconnect the PCM harness connector(s).
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the Evap Purge Solenoid Control Circuit from the
Powertrain Control Module connector to the Evap Purge Solenoid connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the open Evap Purge Solenoid Control Circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
5
Turn the ignition off.
Disconnect the Evap Purge Solenoid harness connector.
Disconnect the PCM harness connector(s).
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between the Evap Purge Solenoid Control Circuit and ground
(B-).
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the short to ground in the Evap Purge Solenoid Control
Circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
6
If there are no possible causes remaining, view repair.
All
Repair
Replace the Powertrain Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
7
At this time, the conditions required to set the DTC are not present.
Note: Use the Freeze Frame Data to help you duplicate the conditions that
set the DTC. Pay particular attention to the DTC set conditions, such as,
VSS, MAP, ECT, and Load.
Note: Visually inspect the related wiring harness. Look for any chafed,
pierced, pinched, or partially broken wires.
Note: Visually inspect the related wire harness connectors. Look for broken,
bent, pushed out, or corroded terminals.
Note: Refer to any technical service bulletins that may apply.
Perform a wiggle test of the Evap Purge Solenoid wiring while the circuit is actuated
with the DRBIII
t. Listen for the solenoid to quit actuating. Also watch for the Good
Trip Counter to change to 0.
Were any problems found?
All
Yes
→
Repair wiring harness/connectors as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
Test Complete.
129
DRIVEABILITY - GAS
P0443-EVAP PURGE SOLENOID CIRCUIT —
Continued
Symptom List:
P0460-FUEL LEVEL UNIT NO CHANGE OVER MILES
P0461-FUEL LEVEL UNIT NO CHANGE OVER TIME
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0460-FUEL LEVEL UNIT NO
CHANGE OVER MILES.
When Monitored and Set Condition:
P0460-FUEL LEVEL UNIT NO CHANGE OVER MILES
When Monitored:
Engine running and fuel level either below 15% or above 85% of
capacity.
Set Condition:
The PCM sees low fuel, less than 15%, for more than 120 miles or fuel level
does not change by at least 4% for more than 250 miles.
P0461-FUEL LEVEL UNIT NO CHANGE OVER TIME
When Monitored:
Engine running and fuel level either below 15% or above 85% of
capacity.
Set Condition:
The PCM sees low fuel, less than 15%, for more than 120 miles or fuel level
does not change by at least 4% for more than 250 miles.
POSSIBLE CAUSES
PHYSICALLY DAMAGED/DEFORMED/OBSTRUCTED FUEL TANK
FUEL LEVEL SENSOR
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Warning: The fuel system is under a constant pressure (even with the engine
off). Before testing or servicing any fuel system hose, fitting or line, the fuel
system pressure must be released.
Remove the fuel tank.
Remove the fuel pump module from the fuel tank.
Inspect the inside of the fuel tank for any obstructions or deformities.
Is the fuel tank free from defects?
All
Yes
→
No
→
Repair or replace the fuel tank as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
2
If there are no possible causes remaining, view repair.
All
Repair
Replace the fuel level sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
130
DRIVEABILITY - GAS
Symptom:
P0462-FUEL LEVEL SENDING UNIT VOLTS TOO LOW
When Monitored and Set Condition:
P0462-FUEL LEVEL SENDING UNIT VOLTS TOO LOW
When Monitored:
Ignition on and battery voltage above 10.4 volts.
Set Condition:
The fuel level sensor signal voltage goes below 0.2 volts at the PCM for
more than 5 seconds.
POSSIBLE CAUSES
FUEL PUMP MODULE WIRING HARNESS INTERMITTENT
FUEL LEVEL SENSOR
FUEL LEVEL SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
POWERTRAIN CONTROL MODULE
FUEL LEVEL SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR GROUND CIRCUIT
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read the fuel level sensor voltage.
Is the fuel level sensor voltage below 0.4 volts?
All
Yes
→
No
→
2
Turn the ignition off.
Disconnect the Fuel Pump Module electrical connector.
Turn the ignition on.
With the DRBIII
t, read the Fuel Level Sensor voltage.
Did the Fuel Level Sensor voltage change from below 0.4 volts to above 9.0 volts?
All
Yes
→
Replace the fuel level sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
3
Turn the ignition off.
Disconnect the Fuel Pump Module electrical connector.
Turn the ignition on.
With the DRBIII
t, read the Fuel Level Sensor voltage.
Did the Fuel Level Sensor voltage change from below 0.4 volts to above 9.0 volts?
All
Yes
→
Replace the fuel level sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
131
DRIVEABILITY - GAS
TEST
ACTION
APPLICABILITY
4
Note: Visually inspect the wiring harness leading to the fuel pump module.
Look for any parts of the wiring harness that may be pinched or rubbed
through.
Turn the ignition on.
With the DRBIII
t, monitor the fuel level sensor voltage.
Using the schematic, wiggle the Fuel Pump Module Connector & Harness.
Was there any fuel level sensor voltage change, during the wiggle test?
All
Yes
→
Repair the wiring harness as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
5
Turn the ignition off.
Disconnect the Fuel Pump Module harness connector.
Disconnect the PCM harness connector(s).
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between the Fuel Level Sensor Signal Circuit and ground
(B-).
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the fuel level sensor signal circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
6
Turn the ignition off.
Disconnect the Fuel Pump Module harness connector.
Disconnect the PCM harness connector(s).
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between the Fuel Level Sensor Signal Circuit and the Sensor
Ground Circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the fuel level sensor signal circuit shorted to the sensor
ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
7
If there are no possible causes remaining, view repair.
All
Repair
Replace the Powertrain Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
132
DRIVEABILITY - GAS
P0462-FUEL LEVEL SENDING UNIT VOLTS TOO LOW —
Continued
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