Jeep XJ. Manual — part 870
TEST
ACTION
APPLICABILITY
15
Turn the ignition off.
Place gear selector in park or neutral position.
Remove the starter relay.
Using a 12-volt test light connected to 12-volts, check the P/N position switch sense
circuit.
Is the test light on?
All
Yes
→
No
→
Repair the open Park/Neutral Switch Sense Circuit between
Starter Relay and splice.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
16
Turn the ignition off.
Remove the starter relay.
WARNING: The parking brake must be on and the transmission must be in
park for a vehicle equipped with an automatic transmission or in neutral
for a vehicle equipped with a manual transmission.
WARNING: The engine may be cranked in the next step. Keep away from
moving engine parts.
Briefly connect a jumper wire between starter relay fused B(+) circuit and starter
relay output circuit.
Did the starter motor crank the engine?
All
Yes
→
Replace the starter relay.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→
17
If there are no potential causes remaining, replace the starter motor.
View repair options.
All
Repair
Replace the Starter.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
241
STARTING
*NO CRANK CONDITION —
Continued
Symptom:
*NO RESPONSE FROM PCM WITH A NO START CONDITION
POSSIBLE CAUSES
PCM FUSED B+ CIRCUIT
PCM FUSED IGNITION SWITCH OUTPUT CIRCUIT
PCM GROUND CIRCUITS
PCM
5 VOLT SUPPLY SHORTED TO GROUND
TEST
ACTION
APPLICABILITY
1
NOTE: The DRBIII
t and cable must be operating properly for the results of
this test to be valid.
NOTE: Ensure the ignition switch was on when trying to communicate with
the PCM.
Turn the ignition off.
Disconnect the PCM harness connector.
Using a 12-volt test light connected to ground, probe the PCM Fused B+ circuit in the
PCM harness connector.
Does the test light illuminate brightly?
All
Yes
→
No
→
Repair the Fused B+ circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
2
Turn the ignition off.
Disconnect the PCM harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the PCM Fused Ignition Switch
Output circuit in the PCM harness connector.
Does the test light illuminate brightly?
All
Yes
→
No
→
Repair the Ignition Switch Output circuit
Perform POWERTRAIN VERIFICATION TEST VER - 1.
3
Turn the ignition off.
Disconnect the PCM harness connector.
Using a 12-volt test light connected to battery voltage, probe the PCM ground circuits
in the PCM harness connector.
Does the test light illuminate brightly?
All
Yes
→
No
→
Repair the PCM ground circuits.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
4
If there is no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module Module in
accordance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
242
STARTING
TEST
ACTION
APPLICABILITY
5
Turn the ignition off.
Disconnect the TP Sensor harness connector.
Turn the ignition on.
Measure the voltage of the 5-Volt Supply circuit in the TP Sensor harness connector.
Is the voltage above 4.0 volts?
All
Yes
→
No
→
6
Turn the ignition off.
Disconnect the TP Sensor harness connector.
Connect a voltmeter to the 5-Volt Supply circuit in the TP Sensor harness connector.
Monitor the voltmeter while disconnecting the following components harness con-
nectors one at a time.
NOTE: If the voltmeter should read above 4.0 volts when a disconnecting a
component harness connector, that component is shorted internally and
well need to be replaced.
CMP Sensor
CKP Sensor
MAP Sensor
VSS
Oil Pressure Sensor
Did the voltmeter read above 4.0 volts when disconnecting the above components?
All
Yes
→
Replace the component that cause the 5-Volt Supply circuit to be
pulled low.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→
7
Turn the ignition off.
Disconnect the PCM harness connector.
Disconnect the CMP Sensor harness connector.
Disconnect the CKP Sensor harness connector.
Disconnect the MAP Sensor harness connector.
Measure the resistance of the 5-Volt Supply circuit (Primary) in the PCM harness
connect to ground.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the 5-Volt Supply circuit (Primary) for a short to ground.
No
→
8
Turn the ignition off.
Disconnect the PCM harness connector.
Disconnect the Oil Pressure Sensor harness connector.
Disconnect the VSS harness connector.
Measure the resistance of the 5-Volt Supply circuit (Secondary) in the PCM harness
connect to ground.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the 5-Volt Supply circuit (Secondary) for a short to ground.
No
→
9
If there are no possible causes remaining, view repair.
All
Repair
Replace the Powertrain Control Module in accordance with the
Service Information.
243
STARTING
*NO RESPONSE FROM PCM WITH A NO START CONDITION —
Continued
TEST
ACTION
APPLICABILITY
10
NOTE: Ensure the TP Sensor harness connector has been reconnected.
Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Measure the voltage of the 5-Volt Supply circuit in the MAP Sensor harness
connector.
Is the voltage above 4.0 volts?
All
Yes
→
Replace the PCM in accordance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→
Replace the TP Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
244
STARTING
*NO RESPONSE FROM PCM WITH A NO START CONDITION —
Continued
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