P0591

P0591-SPEED CONTROL MULTIPLEXED SWITCH PERFORMANCE

P0591-Speed Control Multiplexed Switch Performance:

WHEN MONITORED
Continuously with the ignition on.

SET CONDITION
The Steering Column Control Module (SCCM) has detected that the Speed Control Switch #2 is not operating properly.

POSSIBLE CAUSES
- Intermittent speed control switch 1/2 stuck DTC
- Speed control switch
- Steering column control module (SCCM)

Diagnostic Test

1. DTC IS ACTIVE

NOTE: If P0562-BATTERY VOLTAGE LOW or P0563-BATTERY VOLTAGE HIGH is set along with this DTC, diagnose the battery voltage DTC first.

Ignition on, engine not running.
With the Scan Tool, select View DTCs in the Steering Column Control Module.

Q: Is the DTC status Active at this time?

YES: Go to 2
NO: Go to 4

2. SPEED CONTROL SWITCH

Turn the ignition off.
Replace the Speed Control Switch.
Turn the ignition on.
Move the Speed Control Switch to each position several times.
With the Scan Tool, Clear Stored DTCs in the Steering Column Control Module.
With the Scan Tool, select View DTCs in the Steering Column Control Module.
Move the Speed Control Switch to each position several times while monitoring the Scan Tool.

Q: Does this DTC reset?

YES: Go To 3
NO: Test Complete.

3. STEERING COLUMN CONTROL MODULE (SCCM)

View repair.

Repair
Replace the Steering Column Control Module (SCCM).

4. INTERMITTENT SPEED CONTROL SWITCH 1/2 STUCK DTC

The conditions necessary to set this DTC are not present at this time.
While monitoring the scan tool data relative to this circuit, move the Speed Control Switch to each position several times.
Look for the DTC to reset while the switch is being moved to each position.

Q: Were any problems found?

YES: Repair as necessary.
NO: Test complete.