P0693

SYMPTOM
P0693-COOLING FAN 2 RELAY CONTROL CIRCUIT LOW

WHEN MONITORED
Ignition on and the High Speed Radiator Fan Relay is powered on.

SET CONDITION
The FCM detects and open or short in the Cooling Fan No.2 Relay Control circuit. The circuit is continuously monitored.

POSSIBLE CAUSES
- (A16) FUSED B+ CIRCUITS
- (N112) COOLING FAN NO.2 RELAY CONTROL CIRCUIT OPEN
- (N112) COOLING FAN NO.2 RELAY CONTROL CIRCUIT SHORTED TO GROUND
- HIGH SPEED RADIATOR FAN RELAY
- FRONT CONTROL MODULE

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Scan Tool Testing and Procedures

DIAGNOSTIC TEST
1. HIGH SPEED RADIATOR FAN RELAY OPERATION





Ignition on, engine not running.
With a scan tool, actuate the High Speed Radiator Fan Relay.
Is the Cooling Fan Relay operating?
Yes>> Perform (NGC) POWERTRAIN VERIFICATION TEST VER-5. Powertrain Verification Test - Ver 5
No>> Go To 2

2. (A16) FUSED B+ CIRCUITS





Turn the ignition off.
Remove the High Speed Radiator Fan Relay.
Using a 12-volt test light connected to ground, probe the (A16) Fused B+ circuits in the Relay connection.
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. HIGH SPEED RADIATOR FAN RELAY RESISTANCE
Measure the resistance of the High Speed Radiator Fan Relay Coil.
Is the resistance between 60 to 80 ohms?
Yes>> Go To 4
No>> Replace the Relay. Perform BODY VERIFICATION TEST-VER 1.

4. (N112) COOLING FAN NO.2 CONTROL CIRCUIT OPEN





Disconnect the C3 FCM harness connectors.
Measure the resistance of the (N112) Cooling Fan No.2 Relay Control circuit from the Relay connection to the C3 FCM harness connector.
Is the resistance below 5.0 ohms?
Yes>> Go To 5
No>> Repair the open in the (N112) Cooling Fan No.2 Relay Control circuit. Perform BODY VERIFICATION TEST-VER 1.

5. (N112) COOLING FAN NO.2 CONTROL CIRCUIT SHORTED TO GROUND





Measure the resistance between ground and the (N112) Cooling Fan No.2 Relay Control circuit at the Relay connection.
Is the resistance below 100 ohms?
Yes>> Repair the short to ground in the (N112) Cooling Fan No.2 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 the Front Control Module per Service Information. Perform BODY VERIFICATION TEST-VER 1.