P0691

P0691-COOLING FAN 1 RELAY CONTROL CIRCUIT LOW





For a complete wiring diagram refer to the Wiring Information Electrical Diagrams.

- 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.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. LOW SPEED RADIATOR FAN RELAY OPERATION
1. Ignition on, engine not running.
2. 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. . Intermittent Condition Test

No

- Go To 2

2. INTERNAL FUSED B+ CIRCUITS




1. Turn the ignition off.
2. Remove the Low Speed Radiator Fan Relay.
3. Using a 12-volt test light connected to ground, probe the Internal Fused B+ circuits.

Does the test light illuminate brightly?

Yes

- Go To 3

No

- Repair the open or short to ground in the Internal Fused B+ circuits. Inspect the related fuse and repair as necessary.
- Perform BODY VERIFICATION TEST. Body Verification Test.

3. LOW SPEED RADIATOR FAN RELAY RESISTANCE
1. 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. Body Verification Test.

4. (N201) COOLING FAN NO.1 CONTROL CIRCUIT OPEN




1. Disconnect the IPM FCM 49 way harness connector.
2. Measure the resistance of the (N201) Cooling Fan No.1 Relay Control circuit from the Relay to the IPM FCM harness connector.

Is the resistance below 5.0 ohms?

Yes

- Go To 5

No

- Repair the open in the (N201) Cooling Fan No.1 Relay Control circuit.
- Perform BODY VERIFICATION TEST. Body Verification Test.

5. (N201) COOLING FAN NO.1 CONTROL CIRCUIT SHORTED TO GROUND




1. Measure the resistance between ground and the (N201) Cooling Fan No.1 Relay Control circuit at the Relay connection.

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. Body Verification Test.

No

- Go To 6

6. FRONT CONTROL MODULE (FCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Cooling Fan Relay and the Front Control Module (FCM).
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Cooling Fan Relay and Front Control Module connectors.
4. Search for any Technical Service Bulletins that may apply.

Were there any problems found?

Yes

- Repair as necessary.
- Perform BODY VERIFICATION TEST. Body Verification Test.

No

- Replace Front Control Module.
- Perform BODY VERIFICATION TEST. Body Verification Test.