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Diagnostic Routine I




Diagnostic Routine I

Diagnostic Overview

P2534 or P2535

Refer to Wiring Diagram Set 20 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

When the ignition is turned to the START position or the start/stop switch has been pressed, the PCM (Powertrain Control Module) receives a voltage signal on the crank detect circuit. When the required inputs have been received, the PCM (Powertrain Control Module) supplies voltage and ground to the starter relay coil.

DTC Fault Trigger Conditions






Visual Inspection and Diagnostic Pre-checks

- Inspect BCM (Body Control Module) fuse 78 (5A).

Pinpoint Test

1. CHECK FOR PCM (Powertrain Control Module) DTCs (Diagnostic Trouble Codes)

1. Ignition ON.

2. Using a scan tool, perform PCM (Powertrain Control Module) self-test.

Is PCM (Powertrain Control Module) DTC (Diagnostic Trouble Code) P2535 present?






2. CHECK THE CRANK DETECT CIRCUIT FOR A SHORT TO VOLTAGE

1. Ignition OFF.

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

3. Ignition ON.

4. Measure:





Is any voltage present?






3. CHECK THE CRANK DETECT CIRCUIT FOR A SHORT TO VOLTAGE WITH IGNITION SWITCH OR START/STOP SWITCH DISCONNECTED

1. Ignition OFF.

2. Disconnect: Ignition Switch or Start/Stop Switch.

3. Measure:





Is any voltage present?






4. CHECK THE CRANK DETECT CIRCUIT FOR A SHORT TO GROUND

1. Ignition OFF.

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

3. Measure:





Is the resistance greater than 10,000 ohms?






5. CHECK FOR CORRECT PCM (Powertrain Control Module) OPERATION

1. Ignition OFF.

2. Disconnect and inspect all PCM (Powertrain Control Module) connectors.

3. Repair:

- corrosion (install new connectors 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. Make sure they seat and latch correctly.

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

Is the concern still present?





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