Diagnostic Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

1) HYDRAULIC COOLING FAN OPERATION
Ignition on, engine not running.

Using the scan tool, perform the Hydraulic Fan Solenoid Test.

Does the Hydraulic Cooling Fan operate properly?

Yes
1. Refer to INTERMITTENT CONDITION .
No
1. Go To step 2).
2) (A916) FUSED B+ CIRCUIT CHECK

Fig 1: Checking Fused B(+) Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the Hydraulic Cooling Fan Module harness connector.

Using a 12-volt test light connected to ground, probe the (A916) Fused B+ circuit in the Hydraulic Cooling Fan Module harness connector.

Does the test light illuminate brightly?

Yes
1. Go To step 3).
No
1. Repair the open or short to ground in the (A916) Fused B+ circuit
2. Perform POWERTRAIN VERIFICATION TEST .
3) (K173) HYDRAULIC RADIATOR FAN SOLENOID CONTROL CIRCUIT OPEN BETWEEN THE FAN AND IPM C2 HARNESS CONNECTOR

Fig 2: Checking Hydraulic Radiator Fan Solenoid Control Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Disconnect the IPM C2 40 way connector.

Measure the resistance of the (K173) Hydraulic Radiator Fan Solenoid control circuit from Fan Module harness connector to the IPM C2 40 way harness connector.

Is the resistance below 5.0 ohms?

Yes
1. Go To step 4).
No
1. Repair the excessive resistance in the (K173) Hydraulic Radiator Fan Solenoid Control circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
4) (K173) HYDRAULIC RADIATOR FAN SOLENOID CONTROL CIRCUIT SHORTED TO GROUND BETWEEN THE FAN AND IPM C2 HARNESS CONNECTOR

Fig 3: Checking Hydraulic Radiator Fan Solenoid Control Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Measure the resistance between ground and the (K173) Hydraulic Radiator Fan Solenoid Control circuit in the Fan Module harness connector.

Is the resistance below 100 ohms?

Yes
1. Repair the short to ground in the (K173) Hydraulic Radiator Fan Solenoid Control circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To step 5).
5) (K173) HYDRAULIC RADIATOR FAN SOLENOID CONTROL CIRCUIT OPEN BETWEEN THE FAN AND IPM FCM 49 WAY HARNESS CONNECTOR

Fig 4: Checking Hydraulic Radiator Fan Solenoid Control Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Connect the IPM C2 40 way connector.

Disconnect the IPM FCM 49 way harness connector.

Measure the resistance of the (K173) Hydraulic Radiator Fan Solenoid control circuit from Fan Module harness connector to the IPM FCM 49 way harness connector.

Is the resistance below 5.0 ohms?

Yes
1. Go To step 6).
No
1. Repair the excessive resistance in the (K173) Hydraulic Radiator Fan Solenoid Control circuit in the IPM.
2. Perform POWERTRAIN VERIFICATION TEST .
6) (K173) HYDRAULIC RADIATOR FAN SOLENOID CONTROL CIRCUIT SHORTED TO GROUND BETWEEN THE FAN AND IPM FCM 49 WAY HARNESS CONNECTOR

Fig 5: Checking Hydraulic Radiator Fan Solenoid Control Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Measure the resistance between ground and the (K173) Hydraulic Radiator Fan Solenoid Control circuit in the Fan Module harness connector.

Is the resistance below 100 ohms?

Yes
1. Repair the short to ground in the (K173) Hydraulic Radiator Fan Solenoid Control circuit in the IPM.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To step 7).
7) 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
1. Repair as necessary.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Replace and program the Front Control Module per Service Information.
2. Perform BODY VERIFICATION TEST - VER 1 .