P0693-COOLING FAN 2 CONTROL CIRCUIT LOW





For a complete wiring diagram Refer to Section 8W.



Possible Causes
(K175) HIGH SPEED COOLING FAN RELAY CONTROL CIRCUIT SHORTED TO GROUND
(K175) HIGH SPEED COOLING FAN RELAY CONTROL CIRCUIT OPEN
HIGH SPEED COOLING FAN RELAY
TOTALLY INTEGRATED POWER MODULE

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).



Diagnostic Test

1. COOLING FAN RELAY OPERATION

Ignition on, engine not running.
With a scan tool, actuate the High Speed Cooling Fan Relay RAD FAN 2.

Is the Cooling Fan operating?

Yes


No

2. HIGH SPEED COOLING FAN RELAY

Turn the ignition off.
Verify the High Speed Cooling Fan Relay is installed properly and that the terminals are making a tight fit.
Remove the High Speed Cooling Fan Relay and substitute it with a known good Relay.
Ignition on, engine not running.
With a scan tool, actuate the High Speed Cooling Fan Relay.

Is the Cooling Fan operating?

Yes


No

3. (K175) HIGH SPEED COOLING FAN RELAY CONTROL CIRCUIT SHORT TO GROUND



Turn the ignition off.
Disconnect the C3 TIPM harness connector.
Remove the High Speed Cooling Fan Relay.
Measure the resistance between ground and the (K175) High Speed Cooling Fan Relay Control circuit at the relay connection.

Is the resistance below 100 ohms?

Yes


No

4. (K175) HIGH SPEED COOLING FAN RELAY CONTROL CIRCUIT OPEN



Measure the resistance of the (K175) High Speed Cooling Fan Relay Control circuit from the C3 TIPM harness connector to the Relay connection.

Is the resistance above 5.0 ohms?

Yes


No

5. TOTALLY INTEGRATED POWER MODULE

NOTE: Before continuing, check the TIPM 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 any problems found?

Yes


No