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P0692




DTC P0480, P0481, P0691, P0692, P0693, or P0694

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

DTC Descriptors
DTC P0480
- Cooling Fan Relay 1 Control Circuit

DTC P0481
- Cooling Fan Relay 2 Control Circuit

DTC P0691
- Cooling Fan Relay 1 Control Circuit Low Voltage

DTC P0692
- Cooling Fan Relay 1 Control Circuit High Voltage

DTC P0693
- Cooling Fan Relay 2 Control Circuit Low Voltage

DTC P0694
- Cooling Fan Relay 2 Control Circuit High Voltage

Diagnostic Fault Information





Typical Scan Tool Data











Circuit/System Description

The engine cooling fan system consists of a cooling fan assembly containing two electric cooling fans. The engine control module (ECM) uses two fan control circuits and a series of three relays to command the fans ON in either high speed or low speed, depending on cooling requirements. In low speed, both fans are turned ON at a reduced speed. High speed has both fans turned ON at full speed.

Conditions for Running the DTC

* The ignition voltage is between 10-18 volts.
* The engine speed is greater than 80 RPM.
* DTC P0480, P0481, P0691, P0692, P0693, and P0694 run continuously when the conditions above are met.

Conditions for Setting the DTC

P0480

The ECM detects an open on the low speed cooling fan relay control circuit for greater than 500 mS.

P0481

The ECM detects an open circuit on the high speed cooling fan relay control circuit for greater than 500 mS.

P0691

The ECM detects a short to ground on the low speed cooling fan relay control circuit for greater than 500 mS.

P0692

The ECM detects a short to voltage on the low speed cooling fan relay control circuit for greater than 500 mS.

P0693

The ECM detects a short to ground on the high speed cooling fan relay control circuit for greater than 500 mS.

P0694

The ECM detects a short to voltage on the high speed cooling fan relay control circuit for greater than 500 mS.

Action Taken When the DTC Sets

DTCs P0480, P0481, P0691, P0692, P0693, and P0694 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0480, P0481, P0691, P0692, P0693, and P0694 are Type B DTCs.

Diagnostic Aids

* The ECM has the capability of providing command to the fan relays even when a scan tool output control is being used. Always refer to the fan control command parameters on the scan tool to know which fans are being commanded ON by the ECM.
* The scan tool cooling fan output control operates as follows:

- Cooling Fan Relay 1 operates both fans at a low speed
- Cooling Fan Relay 2 and 3 operates the left fan at a high speed
- Cooling Fan Relay 1, 2 and 3 operates both fans at a high speed

* KR20 cooling fan relay identification:

- The KR20C cooling fan low speed relay is COOL FAN LOW Relay K613
- The KR20E cooling fan speed control relay is COOL FAN CNTRL Relay K614
- The KR20D cooling fan high speed relay is COOL FAN HI Relay K612

* When disconnecting or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the correct orientation in the fuse block. Test the mating electrical terminals for tightness.

Reference Information
Schematic Reference

Engine Cooling Schematics (Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Cooling Fan Description and Operation (Cooling Fan)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

1. Engine operating, observe the DTC information with a scan tool. DTC P0480, P0481, P0691, P0692, P0693, or P0694 should not set.
2. Command the cooling fans ON and OFF at high speed while observing the scan tool circuit test status parameters listed below:

* Cooling Fan Relay 1 Control Circuit Open, Low Voltage, and High Voltage Test Status
* Cooling Fan Relays 2 and 3 Control Circuit Open, Low Voltage, and High Voltage Test Status
The parameters should display OK or Not Run in each of the commanded states.

3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Ignition OFF, disconnect all of the KR20 cooling fan relays.

Note: The following tests must be performed on all three fan relay circuits.

2. Ignition ON, verify that a test lamp illuminates between ground and the relay coil ignition circuit terminal listed below:

* KR20C Relay K613, terminal 86
* KR20D Relay K612, terminal 85
* KR20E Relay K614, terminal 85

• If the test lamp does not illuminate, test the relay coil ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the relay coil ignition circuit fuse is open, test all components connected to the ignition circuit and replace as necessary.

Note: The following tests must be performed on all three fan relay circuits.

3. Connect the red lead of the DMM to a control circuit terminal listed below. Connect the black lead to ground. Set the DMM on the diode setting. The DMM should display OL.

* KR20C Relay K613, terminal 85
* KR20D Relay K612, terminal 86
* KR20E Relay K614, terminal 86

• If less than the specified range, test the appropriate relay coil control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.

Note: The following tests must be performed on all three fan relay circuits.

4. Command the cooling fan relay ON and OFF with a scan tool. The DMM should transition from OL when commanded OFF to less than 1 V when commanded ON.

• If the circuit voltage does not correspond to the specified values, test the control circuit for an open/high resistance or a short to voltage. If the circuit tests normal, replace the K20 ECM.

5. If all circuits test normal, test or replace the appropriate KR20 relay.

Component Testing

1. Ignition OFF, disconnect the KR20 cooling fan relay.
2. Test for 70-110 ohm between terminals 85 and 86.

• If not within the specified range, replace the KR20 cooling fan relay.

3. Measure the resistance between the terminals listed below. The DMM should display O.L.

* 30 and 86
* 30 and 87
* 30 and 85
* 85 and 87

• If less than the specified range, replace the KR20 cooling fan relay.

4. Test the KR20E relay for less than 2 ohm between terminals 30 and 87A.

• If greater than the specified range, replace the KR20E cooling fan relay.

5. Connect a 20 A fused jumper wire between relay terminal 85 and B+. Connect a jumper wire between relay terminal 86 and ground. Test for less than 2 ohm between terminals 30 and 87.

• If greater than the specified range, replace the KR20 cooling fan relay.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Relay Replacement (Removal and Replacement)
* Control Module References (Programming and Relearning) for ECM replacement, setup, and programming

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