Jeep XJ. Manual — part 843
Symptom:
P0463-FUEL LEVEL SENDING UNIT VOLTS TOO HIGH
When Monitored and Set Condition:
P0463-FUEL LEVEL SENDING UNIT VOLTS TOO HIGH
When Monitored:
Ignition on and battery voltage above 10.4 volts.
Set Condition:
The fuel level sensor signal voltage at the PCM goes above 9.9 volts for
more than 90 seconds.
POSSIBLE CAUSES
FUEL LEVEL SENSOR SIGNAL CIRCUIT OPEN
FUEL PUMP MODULE WIRING HARNESS INTERMITTENT
SENSOR GROUND CIRCUIT OPEN
FUEL LEVEL SENSOR
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 above 9.9 volts?
All
Yes
→
No
→
2
Turn the ignition off.
Disconnect the Fuel Pump Module electrical harness connector.
Connect a jumper wire between the Fuel Level Sensor signal circuit and the Sensor
Ground circuit at the Fuel Pump Module harness connector.
Turn the ignition on.
With the DRBIII
t, read the Fuel Level Sensor voltage.
Did the Fuel Level Sensor voltage change from above 9.0 volts to below 0.4 volts?
All
Yes
→
Replace the fuel level sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
133
DRIVEABILITY - GAS
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the Fuel Pump Module electrical harness connector.
Connect a jumper wire between the Fuel Level Sensor signal circuit and the Sensor
Ground circuit at the Fuel Pump Module harness connector.
Turn the ignition on.
With the DRBIII
t, read the Fuel Level Sensor voltage.
Did the Fuel Level Sensor voltage change from above 9.0 volts to below 0.4 volts?
All
Yes
→
Replace the fuel level sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
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 sensor ground circuit from the PCM connector to the Fuel Pump Module
connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the open sensor ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
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
→
134
DRIVEABILITY - GAS
P0463-FUEL LEVEL SENDING UNIT VOLTS TOO HIGH —
Continued
TEST
ACTION
APPLICABILITY
7
Turn the ignition off.
Disconnect the fuel pump module harness connector.
Disconnect the PCM harness connector(s).
Note: Check connectors - It is critical that the connector is free from any
signs of corrosion or deformities - Clean/repair as necessary.
Measure the fuel level sensor signal circuit from the PCM harness connector to the
Fuel Pump Module harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the open fuel level sensor signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
8
If there are no possible causes remaining, view repair.
All
Repair
Replace the Powertrain Control Module
Perform POWERTRAIN VERIFICATION TEST VER - 2.
135
DRIVEABILITY - GAS
P0463-FUEL LEVEL SENDING UNIT VOLTS TOO HIGH —
Continued
Symptom:
P0500-NO VEHICLE SPEED SENSOR SIGNAL
When Monitored and Set Condition:
P0500-NO VEHICLE SPEED SENSOR SIGNAL
When Monitored:
Engine Temperature greater than 104 deg F. , MAP vacuum approxi-
mately 15
9 to 169 inches of mercury and Engine RPM between 1400 and 3000 rpm.
Set Condition:
No Vehicle Speed Signal for more than 15 seconds on two consecutive
trips.
POSSIBLE CAUSES
INTERMITTENT VEHICLE SPEED SIGNAL
5 VOLT SUPPLY CIRCUIT OPEN
SENSOR GROUND CIRCUIT OPEN
VEHICLE SPEED SIGNAL CIRCUIT OPEN
VEHICLE SPEED SIGNAL CIRCUIT SHORTED TO GROUND
VEHICLE SPEED SIGNAL CIRCUIT SHORTED TO VOLTAGE
POWERTRAIN CONTROL MODULE (VEHICLE SPEED SENSOR)
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t , read PCM DTCs.
Is the Good Trip Counter for P-0500 displayed and equal to 0?
All
Yes
→
No
→
2
Turn the ignition off.
Disconnect the PCM harness connector(s).
Disconnect the Vehicle Speed Sensor harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the 5 Volt Supply circuit.
Is the resistance above 5.0 ohms?
All
Yes
→
Repair the 5 Volt Supply circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
136
DRIVEABILITY - GAS
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