Jeep XJ. Manual — part 605
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the Fuel Level Sensor harness connector.
Measure the resistance of the Fuel Level Sensor Ground circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Fuel Level Sensor Ground circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
5
Turn the ignition off.
Disconnect the Fuel Level Sensor harness connector.
Turn the ignition on.
With the DRB, read and record the Fuel Level Sensor voltage.
NOTE: The Fuel Level Sensor voltage should be 10.0 volts with the sensor
harness connector disconnected.
Connect a jumper wire between Fuel Level Sensor harness connector cavities 3 and
4.
With the DRB, read the Fuel Level Sensor voltage.
NOTE: The Fuel Level Sensor voltage should be less then 1.0 volt with the
jumper wire connected.
Are the voltage readings the expected voltages?
All
Yes
→
Replace the Fuel Level Sensor in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
6
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
7
WARNING: KEEP CLEAR OF THE ENGINE’S MOVING PARTS.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
All
Yes
→
Repair as necessary
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Test Complete.
72
DRIVEABILITY - DIESEL
P0463-FUEL LEVEL SENDING UNIT VOLTS TOO HIGH —
Continued
Symptom List:
P0500-VEH. SPEED SENSOR PEC FREQUENCY TOO HIGH
P0500-VEH. SPEED SENSOR PLAUSIBILITY
P0500-VEH. SPEED SENSOR SRC HIGH EXCEEDED
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0500-VEH. SPEED SENSOR
PEC FREQUENCY TOO HIGH.
When Monitored and Set Condition:
P0500-VEH. SPEED SENSOR PEC FREQUENCY TOO HIGH
When Monitored:
With the engine running.
Set Condition:
The ECM detects a vehicle speed greater than 220 km/h (137 MPH).
P0500-VEH. SPEED SENSOR PLAUSIBILITY
When Monitored:
With the engine running.
Set Condition:
The ECM compares the amount of fuel the fuel quantity actuator is
delivering to the vehicle speed from the vehicle speed sensor (VSS). The VSS indicates a
vehicle speed that cannot be achieved with the present amount of fuel being delivered.
P0500-VEH. SPEED SENSOR SRC HIGH EXCEEDED
When Monitored:
With the engine running.
Set Condition:
The ECM detects a vehicle speed greater than 220 km/h (137 MPH).
POSSIBLE CAUSES
VEHICLE SPEED SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR GROUND
POWERTRAIN CONTROL MODULE - 5-VOLT SUPPLY HIGH
POWERTRAIN CONTROL MODULE - AFTER 5-VOLT SUPPLY SHORTED TO VOLTAGE
REPAIR THE 5-VOLT SUPPLY CIRCUIT AND CHECK THE PCM
INTERMITTENT CONDITION
5-VOLT SUPPLY CIRCUIT OPEN
POWERTRAIN CONTROL MODULE - SHORTED TO VOLTAGE
SPEEDOMETER PINION AND DRIVE TEETH DAMAGED
VEHICLE SPEED SENSOR SIGNAL CIRCUIT SHORTED TO 5-VOLT SUPPLY CIRCUIT
5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
ENGINE CONTROL MODULE - SHORTED TO VOLTAGE
VEHICLE SPEED SENSOR SIGNAL CIRCUIT OPEN
5-VOLT SUPPLY CIRCUIT SHORTED TO SENSOR GROUND
73
DRIVEABILITY - DIESEL
POSSIBLE CAUSES
VEHICLE SPEED SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
VEHICLE SPEED SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
POWERTRAIN CONTROL MODULE - 5-VOLT SUPPLY CIRCUIT LOW
SENSOR GROUND CIRCUIT OPEN
VEHICLE SPEED SENSOR
ENGINE CONTROL MODULE - INTERNAL FAULT
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, erase ECM DTCs.
Test drive the vehicle.
With the DRB, read ECM DTCs.
Did this DTC reset?
All
Yes
→
No
→
2
Turn the ignition off.
Remove the Vehicle Speed Sensor.
Inspect the Speedometer Pinion and drive teeth on the Output Shaft (located in the
transmission).
Are both components OK?
All
Yes
→
No
→
Repair or replace the Speedometer Pinion or internal components
as necessary in accordance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
3
Turn the ignition off.
Disconnect the Vehicle Speed Sensor harness connector.
Check connectors - Clean/repair as necessary
Turn the ignition on.
Measure the voltage of the 5-volt Supply circuit in the Vehicle Speed Sensor harness
connector.
Is the voltage between 4.8 and 5.5 volts?
All
Yes
→
Above
Below
4
Turn the ignition off.
Disconnect the Vehicle Speed Sensor harness connector.
Note: Check connectors - Clean/repair as necessary.
Turn the ignition on.
Measure the voltage of the Vehicle Speed Sensor Signal circuit.
Is the voltage above 5.5 volts?
All
Yes
→
No
→
74
DRIVEABILITY - DIESEL
P0500-VEH. SPEED SENSOR PEC FREQUENCY TOO HIGH —
Continued
TEST
ACTION
APPLICABILITY
5
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the Vehicle Speed Sensor harness connector.
Note: Check connectors - Clean/repair as necessary.
Turn the ignition on.
Measure the voltage of the Vehicle Speed Sensor Signal circuit.
Is the voltage above 5.5 volts?
All
Yes
→
No
→
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
6
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Vehicle Speed Sensor harness connector.
Note: Check connectors - Clean/repair as necessary.
Remove the ASD/Diesel Power Relay from the PDC.
Connect a jumper wire between ASD/Diesel Power Relay cavities 30 and 87 (in PDC).
Turn the ignition on.
Measure the voltage of the Vehicle Speed Sensor Signal circuit.
Is the voltage above 5.5 volts?
All
Yes
→
No
→
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
7
If there are no possible causes remaining, view repair.
All
Repair
Repair the Vehicle Speed Sensor Signal circuit for a short to
voltage.
Perform ROAD TEST VERIFICATION - VER-2.
8
Turn the ignition off.
Disconnect the Vehicle Speed Sensor harness connector.
Disconnect the PCM C1 and C2 harness connectors.
Check connectors - Clean/repair as necessary
Measure the resistance between the Vehicle Speed Sensor Signal circuit and the
5-volt Supply circuit.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair the Vehicle Speed Sensor Signal circuit for a short to the
5-volt Supply circuit.
Perform ROAD TEST VERIFICATION - VER-2.
9
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Vehicle Speed Sensor harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the Vehicle Speed Sensor Signal circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Vehicle Speed Sensor Signal circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
75
DRIVEABILITY - DIESEL
P0500-VEH. SPEED SENSOR PEC FREQUENCY TOO HIGH —
Continued
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