Diagnostic Routine D

Diagnostic Routine D

Diagnostic Overview

P188C or P188D

Refer to Wiring Diagram Set 34 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

The active, on-demand AWD (All-Wheel Drive) system uses data from other systems as inputs to the PCM (Powertrain Control Module). The PCM (Powertrain Control Module) uses the inputs to determine the appropriate duty cycle to send to the AWD (All-Wheel Drive) relay module over hardwired command/control circuit and returns information over the feedback/monitor circuit.

DTC Fault Trigger Conditions






Visual Inspection and Diagnostic Pre-checks

- BJB (Battery Junction Box) fuse 70 (10A)

Pinpoint Test

1. CHECK THE AWD (All-Wheel Drive) RELAY MODULE FOR VOLTAGE

1. Ignition OFF.

2. Disconnect: AWD (All-Wheel Drive) Relay Module.

3. Ignition ON.

4. Measure:





Is the voltage greater than 11 volts?






2. CHECK THE AWD (All-Wheel Drive) RELAY MODULE VOLTAGE SUPPLY CIRCUIT

1. Measure:





Is the voltage greater than 11 volts?






3. CHECK THE AWD (All-Wheel Drive) RELAY MODULE CONTROL AND FEEDBACK CIRCUITS FOR A SHORT TO VOLTAGE

1. Ignition OFF.

2. Disconnect: PCM (Powertrain Control Module) C175B.

3. Ignition ON.

4. Measure:





Is any voltage present?






4. CHECK THE AWD (All-Wheel Drive) RELAY MODULE CONTROL AND FEEDBACK CIRCUITS FOR A SHORT TO GROUND

1. Ignition OFF.

2. Measure:





Are the resistances greater than 10,000 ohms?






5. CHECK THE AWD (All-Wheel Drive) RELAY MODULE CONTROL AND FEEDBACK CIRCUITS FOR AN OPEN

1. Measure:





Are the resistances less than 3 ohms?






6. CHECK THE AWD (All-Wheel Drive) RELAY MODULE CONTROL AND FEEDBACK CIRCUITS A SHORT TOGETHER

1. Measure:





Is the resistance greater than 10,000 ohms?






7. CHECK FOR CORRECT AWD (All-Wheel Drive) RELAY MODULE OPERATION

1. Ignition OFF.

2. Disconnect and inspect all PCM (Powertrain Control Module) connectors and the AWD (All-Wheel Drive) relay module connector.

3. Repair:

- corrosion (install new connector or terminals- clean module pins)
- damaged or bent pins- install new terminals/pins
- pushed-out pins- install new pins as necessary

4. Reconnect the PCM (Powertrain Control Module) connectors and the AWD (All-Wheel Drive) relay module connector. Make sure they seat and latch correctly.

5. Operate the system and determine if the concern is still present.

Is the concern still present?