P0691-COOLING FAN 1 RELAY CONTROL CIRCUIT LOW

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 RELAY CONTROL CIRCUIT OPEN

(N201) LOW SPEED FAN RELAY 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).

1.LOW SPEED RADIATOR FAN RELAY OPERATION

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)

2.INTERNAL FUSED B+ CIRCUITS

Is the voltage above 11.0 volts?

Yes

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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

3.LOW SPEED RADIATOR FAN RELAY RESISTANCE

Is the resistance between 60 to 80 ohms?

Yes

Replace the Low Speed Radiator Fan Relay.
Perform BODY VERIFICATION TEST. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

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

Is the resistance below 5.0 ohms?

Yes

Repair the open in the (N201) Cooing Fan No.1 Relay Control circuit.
Perform BODY VERIFICATION TEST. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

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

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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

6.FRONT CONTROL MODULE

NOTE: Before continuing, check the FCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Were there any problems found?

Yes

Replace Front Control Module per Service Information.
Perform BODY VERIFICATION TEST. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)