Jeep Grand Cherokee WK. Manual — part 1036
P0688-AUTO SHUTDOWN RELAY SENSE CIRCUIT LOW (CONTINUED)
6.
(K342/F42) ASD RELAY OUTPUT CIRCUIT OPEN
Disconnect the C3 PCM harness connector.
CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage
the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform
diagnosis.
Measure the resistance of the (K342/F42) ASD Relay Output circuit from the Relay connection to the appropriate
terminals of special tool #8815.
Is the resistance below 5.0 ohms?
Yes
>> Go To 7
No
>> Repair the open in the (K342/F42) ASD Relay Output circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
7.
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)
9 - 740
ENGINE ELECTRICAL DIAGNOSTICS
WK
P0691-COOLING FAN 1 RELAY CONTROL CIRCUIT LOW
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 741
P0691-COOLING FAN 1 RELAY CONTROL CIRCUIT LOW (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 with the Cooling fan No.1 Relay actuated.
•
Set Condition:
The FCM recognizes and open or short to ground in the Cooling Fan Relay No.1 Control circuit.
Possible Causes
(A16) FUSED B+ CIRCUIT
(N201) LOW SPEED FAN RELALY CONTROL CIRCUIT OPEN
(N201) LOW SPEED FAN RELALY CONTROL CIRCUIT SHORTED TO GROUND
LOW SPEED RADIATOR FAN RELAY
FCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
LOW SPEED RADIATOR FAN RELAY OPERATION
Ignition on, engine not running.
With a scan tool, actuate the Low Speed Radiator Fan Relay.
Is the Cooling Fan 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.
(A16) FUSED B+ CIRCUITS
Turn the ignition off.
Remove the Low Speed Radiator Fan Relay.
Using a 12-volt test light connected to ground, probe the (A16) Fused B+ circuits.
Is the voltage above 11.0 volts?
Yes
>> Go To 3
No
>> Repair the open or short to ground in the (A16) Fused B+ circuits. Inspect the related fuse and repair
as necessary.
Perform BODY VERIFICATION TEST-VER 1.
3.
LOW SPEED RADIATOR FAN RELAY RESISTANCE
Measure the resistance of the Low Speed Radiator Fan Relay Coil.
Is the resistance between 60 to 80 ohms?
Yes
>> Go To 4
No
>> Replace the Low Speed Radiator Fan Relay.
Perform BODY VERIFICATION TEST-VER 1.
9 - 742
ENGINE ELECTRICAL DIAGNOSTICS
WK
P0691-COOLING FAN 1 RELAY CONTROL CIRCUIT LOW (CONTINUED)
4.
(N201) COOLING FAN NO.1 CONTROL CIRCUIT OPEN
Disconnect the IPM FCM 49 way harness connector.
Measure the resistance of the (N201) Cooling Fan No.1 Relay Control circuit from the Relay to the IPM FCM har-
ness connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 5
No
>> Repair the open in the (N201) Cooing Fan No.1 Relay Control circuit.
Perform BODY VERIFICATION TEST-VER 1.
5.
(N201) COOLING FAN NO.1 CONTROL CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (N201) Cooling Fan No.1 Relay Control circuit at the Relay con-
nection.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (N201) Cooling Fan No.1 Relay Control circuit.
Perform BODY VERIFICATION TEST-VER 1.
No
>> Go To 6
6.
FRONT CONTROL MODULE
NOTE: Before continuing, check the FCM 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 BODY VERIFICATION TEST-VER 1.
No
>> Replace Front Control Module per Service Information.
Perform BODY VERIFICATION TEST-VER 1.
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 743
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст