For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category.

### DTC Descriptor

DTC C0574 02: Printed Circuit Board Temperature Sensor Short to Ground
DTC C0574 04: Printed Circuit Board Temperature Sensor Open
DTC C0574 13: Printed Circuit Board Temperature Sensor Low Voltage/High Temperature
DTC C0574 14: Printed Circuit Board Temperature Sensor High Voltage/Low Temperature

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Control | C0574 02 | C0574 04 | -- | C0574 13, C0574 14
Low Reference | C0574 02 | C0574 04 | -- | C0574 13, C0574 14

### Circuit/System Description

A temperature sensor is installed on the circuit board of the rear differential clutch control module. The value from this is used for calculating the board temperature and together with information on prevailing driving conditions the temperature of the fluid in the differential clutch is also calculated.

### Conditions for Running the DTC

• | The ignition is ON.

• | The test runs with a frequency of 50 Hz.

### Conditions for Setting the DTC

#### C0574 02

The analog-digital converter circuit is shorted to ground for more than 3 s.

#### C0574 04

The analog-digital converter circuit is open for more than 3 s.

#### C0574 13

The board temperature is greater than 115°C (239°F) for more than 3 s.

#### C0574 14

The board temperature is less than -40°C (-40°F) for more than 3 s.

### Action Taken When the DTC Sets

One or more of the following actions may occur:

• | All-wheel drive (AWD) is disabled.

• | Service AWD is displayed on the driver information center.

### Conditions for Clearing the DTC

#### C0574 02 and C0574 04

• | The condition for the DTC is no longer present.

• | The circuit is not tested unless power is cycled.

#### C0574 13 and C0574 14

• | The temperature is within the limit for more than 30 s.

• | The circuit is tested with a frequency of 50 Hz.

### Diagnostic Aids

#### C0574 13 and C0574 14

The DTCs C0574 13 and C0574 14 indicate that the rear differential clutch control module temperature is out of bounds. This is a temporary fault. The rear differential clutch control module is protected against running during critical temperatures. As soon as the temperature reaches normal values the actual DTC is cleared.

### Reference Information

#### Schematic Reference

Rear Axle Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

All-Wheel Drive Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for diagnostic tester information

### Circuit/System Verification

Engine running, observe the scan tool Rear Differential Clutch Control Module Temperature parameter. The reading should be between -40°C (-40°F) and 115°C (239°F) when stationary.

### Circuit/System Testing

#### C0574 02 and 0574 04

Ignition ON. Verify that DTC C0574 02 or 0574 04 is not set.

⇒ | If any of the DTCs are set, replace the K47 Rear Differential Clutch Control Module.

#### C0574 13 and 0574 14

1. Ignition OFF, wait till the housing and the K47 Rear Differential Clutch Control Module temperatures are adapted to the environment temperature, approx. 0-40°C (32-104°F).
2. Verify that DTC C0574 13 or C0574 14 is not set.

⇒ | If any of the DTCs are set, replace the K47 Rear Differential Clutch Control Module.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Limited Slip Differential Clutch Valve Replacement

• | Control Module References for rear differential clutch control module replacement, setup, and programming