Jeep XJ. Manual — part 616
POSSIBLE CAUSES
5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
APP SENSOR CIRCUIT SHORTED TO VOLTAGE
APP SENSOR IDLE VOLTAGE
APP SENSOR WIDE OPEN THROTTLE VOLTAGE
ECM SENSOR GROUND CIRCUIT OPEN
LOW IDLE POSITION SWITCH SENSE CIRCUIT SHORTED TO VOLTAGE
5-VOLT SUPPLY CIRCUIT SHORTED TO THE SENSOR GROUND CIRCUIT
APP SENSOR SIGNAL CIRCUIT SHORTED TO THE SENSOR GROUND CIRCUIT
INTERMITTENT CONDITION
LOW IDLE POSITION SWITCH SENSE CIRCUIT SHORTED TO THE SENSOR GROUND CIR-
CUIT
5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
APP SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
LOW IDLE POSITION SWITCH SENSE CIRCUIT SHORTED TO GROUND
5-VOLT SUPPLY CIRCUIT OPEN
APP SENSOR SIGNAL CIRCUIT OPEN
LOW IDLE POSITION SWITCH SENSE CIRCUIT OPEN
ECM - 5-VOLT SUPPLY CIRCUIT
ECM - APP SENSOR SIGNAL CIRCUIT
PCM SENSOR GROUND CIRCUIT OPEN
PCM - SENSOR GROUND CIRCUIT
VERIFY LOW IDLE POSITION SWITCH OPERATION
VERIFY APP SENSOR OPERATION
ECM - SENSOR GROUND OPEN
VERIFY CORRECT SWITCHING
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Connect one end of a jumper wire to APP Sensor harness connector cavity 4.
Turn the ignition on.
With the DRB III, monitor the Low Idle Position Switch input while tapping the other
end of the jumper wire to APP Sensor harness connector cavity 5.
Does the DRB III change between IDLE and ABOVE IDLE when tapping the jumper
wire?
All
Yes
→
No
→
116
DRIVEABILITY - DIESEL
P1515-ACCEL. PEDAL SENSOR PLAUSIBILITY —
Continued
TEST
ACTION
APPLICABILITY
2
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Remove the ASD/Diesel Power Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 ASD/Diesel Power Relay
connector.
Turn the ignition on.
Measure the voltage of the Low Idle Position Switch Sense circuit.
Is the voltage above 1.0 volt?
All
Yes
→
Repair the Low Idle Position Switch Sense circuit for a short to
voltage.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
3
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between the Low Idle Position Switch Sense circuit and the
Sensor Ground circuits at cavity 4 and 8 of the APP Sensor harness connector.
Is the resistance above 100 kohms for both measurements?
All
Yes
→
No
→
Repair the Low Idle Position Switch Sense circuit and Sensor
Ground circuit for a short together.
Perform ROAD TEST VERIFICATION - VER-2.
4
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the Low Idle Position Switch Sense
circuit.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair the Low Idle Position Switch Sense circuit for a short to
ground.
Perform ROAD TEST VERIFICATION - VER-2.
5
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the Low Idle Position Switch Sense circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Low Idle Position Switch Sense circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
117
DRIVEABILITY - DIESEL
P1515-ACCEL. PEDAL SENSOR PLAUSIBILITY —
Continued
TEST
ACTION
APPLICABILITY
6
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the PCM harness connectors.
Measure the resistance of the Sensor Ground circuit between APP Sensor harness
connector cavity 4 and the PCM harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the PCM APP Sensor Ground circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
7
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
8
Turn the ignition on.
With the DRB III observe the Low Idle Position Switch input.
Press and release the accelerator pedal several times while observing the DRB III
display.
NOTE: The Low Idle Position Switch input should change from IDLE to
ABOVE IDLE when pressing and releasing the accelerator pedal.
Did Low Idle Position Switch input change between IDLE and ABOVE IDLE?
All
Yes
→
No
→
Replace the Accelerator Pedal Position Sensor in accordance with
the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
9
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Turn the ignition on.
Measure the voltage of the 5-volt Supply circuit in APP Sensor harness connector
cavity 10.
Is the voltage between 4.7 and 5.3 volts?
All
Yes
→
No
→
10
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Connect a jumper wire between APP Sensor harness connector cavities 7 and 10.
With the DRBIII, read the PEDAL OUTPUT VOLTS.
Does the DRBIII display between 4.0 and 5.5 volts?
All
Yes
→
No
→
118
DRIVEABILITY - DIESEL
P1515-ACCEL. PEDAL SENSOR PLAUSIBILITY —
Continued
TEST
ACTION
APPLICABILITY
11
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the Sensor Ground circuit between APP Sensor harness
connector cavity 8 and ECM harness connector C1.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the ECM APP Sensor Ground circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
12
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Turn the ignition on.
Connect a voltmeter between the 5-volt Supply circuit cavity 10 and the Sensor
Ground circuit cavity 8 in the APP Sensor harness connector.
Is the voltage between 4.5 and 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.
13
Turn the ignition on.
With the DRB III, read the PEDAL OUTPUT VOLTS with the accelerator pedal in
the at rest position.
Does the DRB III display between 0.28 and 0.38 volt?
All
Yes
→
No
→
Replace the Accelerator Pedal Position Sensor in accordance with
the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
14
Turn the ignition on.
Fully depress the accelerator pedal.
With the DRBIII, read the PEDAL OUTPUT VOLTS.
Does the DRB III display between 4.1 and 4.6 volts?
All
Yes
→
No
→
Replace the Accelerator Pedal Position Sensor in accordance with
the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
15
Turn the ignition on.
With the DRB III, read the PEDAL OUTPUT VOLTS.
With the accelerator pedal in the idle position, slowly depress the accelerator pedal
until the pedal is fully depressed.
NOTE: The PEDAL OUTPUT VOLTS should increase smoothly as the pedal
is depressed.
Does the voltage increase smoothly with the accelerator pedal travel?
All
Yes
→
No
→
Replace the Accelerator Pedal Position Sensor in accordance with
the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
119
DRIVEABILITY - DIESEL
P1515-ACCEL. PEDAL SENSOR PLAUSIBILITY —
Continued
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