Jeep XJ. Manual — part 641
Symptom:
P1655-AC CONTROL SHORT CIRCUIT - DIESEL
When Monitored and Set Condition:
P1655-AC CONTROL SHORT CIRCUIT - DIESEL
When Monitored:
With the ignition on.
Set Condition:
The ECM detects excessive current draw on the A/C clutch relay control
circuit when attempting to activate the A/C clutch. NOTE: AC is an option that may not be
present on all vehicles.
POSSIBLE CAUSES
INTERMITTENT CONDITION
SUBSTITUTE A/C COMPRESSOR CLUTCH RELAY
A/C COMPRESSOR CLUTCH RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE
ENGINE CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, actuate the A/C Compressor Clutch Relay.
Is the A/C Compressor Clutch Relay clicking?
All
Yes
→
No
→
NOTE: Stop the A/C Compressor Clutch Relay actuation by the DRB.
2
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.
216
HEATING & A/C
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Install a substitute relay in place of the A/C Compressor Clutch Relay.
Turn the ignition on.
With the DRB, actuate the A/C Compressor Clutch Relay.
Is the A/C Compressor Clutch clicking?
All
Yes
→
Replace the A/C Compressor Clutch Relay.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
4
Turn the ignition off.
Disconnect the ECM harness connector(s).
Remove the A/C Compressor Clutch Relay from the PDC.
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 A/C Compressor Clutch Relay Control circuit.
Is the voltage above 1.0 volt?
All
Yes
→
Repair the A/C Compressor Clutch Relay Control circuit for a
short to voltage.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
5
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.
217
HEATING & A/C
P1655-AC CONTROL SHORT CIRCUIT - DIESEL —
Continued
Symptom:
P1596-SPEED CONTROL SWITCH ALWAYS HIGH - DIESEL
When Monitored and Set Condition:
P1596-SPEED CONTROL SWITCH ALWAYS HIGH - DIESEL
When Monitored:
With the ignition on and battery voltage above 10.4 volts.
Set Condition:
The PCM detects voltage above 4.8 volts on the S/C switch signal circuit
for at least 2 minutes.
POSSIBLE CAUSES
CHECKING S/C ON/OFF-SET SWITCH
PCM - S/C SIGNAL CIRCUIT OPEN
PCM - S/C SIGNAL CIRCUIT SHORTED TO VOLTAGE
PCM - SENSOR GROUND OPEN
S/C ON/OFF-SET SWITCH SIGNAL CIRCUIT OPEN
S/C SWITCH SIGNAL CIRCUIT SHORTED TO VOLTAGE
SENSOR GROUND OPEN
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the S/C ON/OFF-SET button harness connector.
Turn the ignition on.
Measure the voltage of the S/C Switch Signal circuit.
Select the appropriate voltage reading.
All
Below 4.5 volts.
Between 4.5 and 5.5 volts.
Above 5.5 volts
2
Turn the ignition off.
Disconnect the S/C ON/OFF-SET Switch harness connector.
Disconnect the PCM harness connectors.
Measure the resistance of the S/C Switch Signal circuit.
Is the resistance below 10.0 ohms?
All
Yes
→
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform SPEED CONTROL VERIFICATION - VER-4.
No
→
Repair the S/C ON/OFF-SET Switch Signal circuit for an open.
Perform SPEED CONTROL VERIFICATION - VER-4.
218
SPEED CONTROL
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the S/C ON/OFF-SET button harness connector.
Turn the ignition on.
Connect a jumper wire between the S/C Switch Signal circuit and the Sensor Ground
at the ON/OFF-SET Switch harness connector.
With the DRB III, read the S/C Switch Volts.
Does the DRB III display below 0.5 volts?
All
Yes
→
Replace the S/C ON/OFF-SET Switch
Perform SPEED CONTROL VERIFICATION - VER-4.
No
→
4
Turn the ignition off.
Disconnect the S/C ON/OFF-SET Switch harness connector.
Disconnect the PCM harness connectors.
Measure the resistance of the Sensor Ground circuit.
Is the resistance below 10.0 ohms?
All
Yes
→
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform SPEED CONTROL VERIFICATION - VER-4.
No
→
Repair the Sensor Ground circuit for an open.
Perform SPEED CONTROL VERIFICATION - VER-4.
5
Turn the ignition off.
Disconnect the S/C ON/OFF-SET Switch harness connector.
Disconnect the PCM harness connectors.
Turn the ignition on.
Measure the voltage of the S/C Switch Signal circuit.
Is the voltage above 1.0 volt?
All
Yes
→
Repair the S/C Switch Signal circuit for a short to voltage.
Perform SPEED CONTROL VERIFICATION - VER-4.
No
→
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform SPEED CONTROL VERIFICATION - VER-4.
219
SPEED CONTROL
P1596-SPEED CONTROL SWITCH ALWAYS HIGH - DIESEL —
Continued
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