Cruze

DTC P0691-P0694 - LNP or LNQ

The engine control module (ECM) commands the fans ON in either high speed, medium speed, or low speed, depending on cooling requirements.

Low Speed

In low speed operation, the ECM commands the medium speed fan relay on. This energises the relay coil. The medium speed cooling fan relay supply power to the cooling fan motor - right and the cooling fan motor - left.

This energizes the relay coils. The low speed cooling fan relays supply power to the cooling fan motor - right and the cooling fan motor - left through internal fan resistors.

Medium Speed

In medium speed operation, the ECM applies ground to the coil side of the cooling fan left low speed relay, the cooling fan right low speed relay and the cooling fan speed control 2 relay.

High Speed

In high speed operation, the ECM applies ground to the coil side of the cooling fan high speed relay. When energised, the high speed relay apply voltage directly to the right and the cooling fan motor.

P0691 00

The ECM detects a short to ground on the cooling fan relay 1 control circuit.

P0692 00

The ECM detects a short to voltage on the cooling fan relay 1 control circuit.

P0693 00

The ECM detects a short to ground on the cooling fan relay 2 control circuit.

P0694 00

The ECM detects a short to voltage on the cooling fan relay 2 control circuit.

DTCs P0691 00, P0692 00, P0693 00 and P0694 00 are Type B DTCs.

DTCs P0691 00, P0692 00, P0693 00 and P0694 00 are Type B DTCs.

Schematic Reference

Connector End View Reference

Component Connector End Views

Description and Operation

Cooling System Description and Operation

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Command the Cooling Fan Relay 1 ON and OFF with a scan tool. The clicking sound of the relay should be heard when changing between the commanded states.

⇒	If the relay does not operate correctly, refer to P0691 00 and P0692 00.

2. Command the Cooling Fan Relay 2 ON and OFF with a scan tool. The clicking sound of the relay should be heard when changing between the commanded states.

⇒	If the relay does not operate correctly, refer to P0693 00 and P0694 00.

3. Command the Cooling Fan Relay 3 ON and OFF with a scan tool. The clicking sound of the relay should be heard when changing between the commanded states.

⇒	If the relay does not operate correctly, refer to P0695 00 and P0696 00.

P0691 00 and P0692 00

1. Ignition OFF, disconnect the KR20A Cooling Fan Medium Speed 1 Relay.
2. Ignition ON, verify that a test lamp illuminates between the relay coil ignition circuit terminal 86 and ground.

⇒	If the test lamp does not illuminate, replace the X50A Fuse Block - Underbonnet.

3. Verify that a test lamp does not illuminate between the relay coil control circuit terminal 85 and ground.

⇒	If the test lamp illuminates, test the relay coil control circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.

4. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the relay coil control circuit terminal 85 and ground.

⇒	If less than the specified value, test the relay coil control circuit for a short to ground.

5. Test for less than 5 Ω between relay coil control circuit terminal 85 and K20 Engine Control Module terminal X1 85.

⇒	If greater than the specified value, test the relay coil control circuit for an open/high resistance.

6. If all circuits test normal, test or replace the KR20A Cooling Fan Medium Speed 1 Relay and verify the DTC does not reset.

⇒	If the DTC resets, replace the K20 Engine Control Module.

P0693 00 and P0694 00

1. Ignition OFF, disconnect the KR20G Cooling Fan Left Low Speed Relay, KR20L Cooling Fan Speed Control 2 Relay and KR20H Cooling Fan Right Low Speed Relay.
2. Ignition ON, verify that a test lamp illuminates between the relay coil ignition circuits terminal 86 and ground.

⇒	If the test lamp does not illuminate, replace the X70A Relay Block - Under bonnet.

3. Verify that a test lamp does not illuminate between the relay coil control circuit terminal 85 and ground.

⇒	If the test lamp illuminates, test the relay coil control circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.

4. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the relay coil control circuit terminal 85 and ground.

⇒	If less than the specified value, test the relay coil control circuit for a short to ground.

5. Test for less than 5 Ω between relay coil control circuit terminal 85 and K20 Engine Control Module terminal X2 36.

⇒	If greater than the specified value, test the relay coil control circuit for an open/high resistance.

6. If all circuits test normal, test or replace the KR20G Cooling Fan Left Low Speed Relay, KR20L Cooling Fan Speed Control 2 Relay and KR20H Cooling Fan Right Low Speed Relay and verify the DTC does not reset.

⇒	If the DTC resets, replace the K20 Engine Control Module.

P0695 00 and P0696 00

1. Ignition OFF, disconnect the KR20D Cooling Fan High Speed Relay.
2. Ignition ON, verify that a test lamp illuminates between the relay coil ignition circuit terminal 86 and ground.

⇒	If the test lamp does not illuminate, replace the X50A Fuse Block - Underbonnet.

3. Verify that a test lamp does not illuminate between the relay coil control circuit terminal 85 and ground.

⇒	If the test lamp illuminates, test the relay coil control circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.

4. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the relay coil control circuit terminal 85 and ground.

⇒	If less than the specified value, test the relay coil control circuit for a short to ground.

5. Test for less than 5 Ω between relay coil control circuit terminal 85 and K20 Engine Control Module terminal X2 42.

⇒	If greater than the specified value, test the relay coil control circuit for an open/high resistance.

6. If all circuits test normal, test or replace the KR20D Cooling Fan High Speed Relay and verify the DTC does not reset.

⇒	If the DTC resets, replace the K20 Engine Control Module.

Dynamic Test

1. Ignition OFF, disconnect the applicable relay.
2. Test for 70-110 Ω between terminals 85 and 86 of the relay.

⇒	If the resistance is not within the specified range, replace the relay.

3. Test for infinite resistance between the following terminals:

•

30 and 86

•

30 and 87

•

30 and 85

•

85 and 87

⇒	If not the specified value, replace the relay.

4. Install a 20 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 Ω between terminals 30 and 87.

⇒	If greater than the specified range, replace the relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. Ignition ON, verify with a scan tool that the ECM is not commanding fan activation.
2. Ignition ON, observe that the fan is not activated.

Ignition ON, verify with a scan tool that the ECM is not commanding fan activation. Ignition ON, observe that the fan is not activated.