Jeep Grand Cherokee WK. Manual — part 1034
P0653-SENSOR REFERENCE VOLTAGE 2 CIRCUIT HIGH (CONTINUED)
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Ignition on.
•
Set Condition:
When the PCM recognizes the Auxiliary 5-volt Supply circuit voltage is too high. One Trip Fault. ETC light is
flashing.
Possible Causes
(F856) AUXILIARY 5-VOLT SUPPLY SHORTED TO BATTERY VOLTAGE
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
ACTIVE DTC
Ignition on, engine not running.
With a scan tool, read DTCs.
Is the DTC active at this time?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.
(F856) AUXILIARY 5-VOLT SUPPLY SHORTED TO BATTERY VOLTAGE
Turn the ignition off.
Disconnect the C1 PCM harness connector.
Disconnect all the Sensors that share the (F856) Auxiliary 5-volt Sup-
ply circuit.
NOTE: Improperly installed aftermarket accessories can cause
this DTC to set. Check for wiring added by customer.
Ignition on, engine not running.
Measure the voltage on the (F856) Auxiliary 5-volt Supply circuit at the
CMP Sensor harness connector.
Is the voltage above 0 volts?
Yes
>> Repair the short to battery voltage in the (F856) Auxiliary
5-volt Supply circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 3
9 - 732
ENGINE ELECTRICAL DIAGNOSTICS
WK
P0653-SENSOR REFERENCE VOLTAGE 2 CIRCUIT HIGH (CONTINUED)
3.
PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.
Were there any problems found?
Yes
>> Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 733
P0685-AUTO SHUTDOWN RELAY CONTROL CIRCUIT
9 - 734
ENGINE ELECTRICAL DIAGNOSTICS
WK
P0685-AUTO SHUTDOWN RELAY CONTROL CIRCUIT (CONTINUED)
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With ignition on. Battery voltage above 10 volts.
•
Set Condition:
The actual ASD state is not equal to the desired ASD state. One Trip Fault. Three good trips to turn off the
MIL.
Possible Causes
(A924) FUSED B+ CIRCUITS
(K342) ASD RELAY CONTROL CIRCUIT OPEN
(K342) ASD RELAY CONTROL CIRCUIT SHORTED TO GROUND
ASD RELAY
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
ASD RELAY OPERATION
Ignition on, engine not running.
With a scan tool, actuate the ASD Relay.
Is the ASD Relay operating?
Yes
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 2
2.
(A924) FUSED B+ CIRCUITS
Turn the ignition off.
Remove the ASD Relay from the IPM.
Using a 12-volt test light connected to ground, probe the (A924) Fused B+ circuits in the IPM.
Does the test light illuminate brightly?
Yes
>> Go To 3
No
>> Repair the open or short to ground in the (A924) Fused B+ circuits. Inspect and replace any open fuses.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
3.
ASD RELAY
Measure the resistance of the ASD Relay Coil.
Is the resistance between 60 to 80 ohms?
Yes
>> Go To 4
No
>> Replace the ASD Relay.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 735
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