P1647-HYDRAULIC COOLING FAN CONTROL CIRCUIT HIGH
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
Ignition on and engine running.
- Set Condition:
An open or shorted condition in the Hydraulic Fan Solenoid Control circuit is detected by the Front Control Module.
| Possible Causes |
| (Z823) GROUND CIRCUIT OPEN |
| (K173) HYDRAULIC RADIATOR FAN SOLENOID CONTROL CIRCUIT SHORTED TO VOLTAGE |
| INTEGRATED POWER MODULE |
| FRONT CONTROL MODULE |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) .
Diagnostic Test
1. HYDRAULIC COOLING FAN OPERATIONIgnition on, engine not running.
Using the scan tool, perform the Hydraulic Fan Solenoid Test.
Does the Hydraulic Cooling Fan operate properly?
Yes
- Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
No
- Go To 2
2. (Z823) GROUND CIRCUIT CHECK
Turn the ignition off.
Disconnect the Hydraulic Cooling Fan Module harness connector.
Using a 12-volt test light connected to B+, probe the (Z823) Ground circuit in the Hydraulic Cooling Fan Module harness connector.
Does the test light illuminate brightly?
Yes
- Go To 3
No
- Repair the open in the (Z823) Ground circuit.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
3. (K173) HYDRAULIC RADIATOR FAN SOLENOID CONTROL CIRCUIT SHORTED TO VOLTAGE BETWEEN THE FAN AND IPM FCM 49 WAY HARNESS CONNECTOR
Disconnect the IPM FCM 49 way connector.
Ignition on, engine not running.
Measure the voltage on the (K173) Hydraulic Radiator Fan Solenoid control circuit at the Hydraulic Fan Module harness connector.
Is the voltage above 0 volts?
Yes
- Go To 4
No
- Go To 5
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
4. (K173) HYDRAULIC RADIATOR FAN SOLENOID CONTROL CIRCUIT SHORTED TO VOLTAGE IN THE IPM
Turn the ignition off.
Disconnect the C2 IPM 40 way harness connector.
Ignition on, engine not running.
Measure the voltage on the (K173) Hydraulic Radiator Fan Solenoid control circuit at the Hydraulic Fan Module harness connector.
Is the voltage above 0 volts?
Yes
- Repair the short to voltage in the (K173) Hydraulic Radiator Fan Solenoid control circuit between the Hydraulic Cooling Fan Module harness connector and the C2 IPM harness connector.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Replace the Integrated Power Module per Service Information.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
5. 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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Replace and program the Front Control Module per Service Information.
- Perform BODY VERIFICATION TEST. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)