Powertrain Control Module (PCM), NGC (2602430)

P1593-SPEED CONTROL SWITCH 1/2 STUCK





For a complete wiring diagram, refer to the Wiring Information. Electrical Diagrams

- When Monitored:
Continuously with the ignition on.

- Set Condition:
The Powertrain Control Module (PCM) detects that the Speed Control Switch signal voltage received over the bus is not plausible.





1. DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE

NOTE: Diagnose and repair any system voltage DTCs before proceeding with this test.

NOTE: Diagnose and repair any communication DTCs between the SCM and the PCM before proceeding with this test.

1. Start the engine and allow it to idle for at least 60 seconds.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in possible serious or fatal injury.

NOTE: It may be necessary to test drive the vehicle and operate the speed control in order for this DTC to set.

2. With a scan tool, select View DTCs.

Is the status Active for this DTC?

Yes

- Go To 2

No

- Perform the CHECKING FOR AN INTERMITTENT DTC diagnostic procedure. Checking for an Intermittent DTC.

2. SPEED CONTROL SWITCH
1. Turn the ignition off.
2. Replace the Speed Control Switch.
3. Turn the ignition on.
4. Move the Speed Control Switch to each position several times.
5. Using the scan tool, Clear DTCs.
6. Move the Speed Control Switch to each position several times while monitoring related data on the scan tool.

NOTE: It may be necessary to test drive the vehicle and operate the speed control in order for this DTC to set.

7. With a scan tool, select View DTCs.

Is the status Active for this DTC?

Yes

- Go To 3

No

- Test Complete.

3. STEERING CONTROL MODULE (SCM)
1. Using the wiring diagram/schematic as a guide, inspect the related wiring and connectors.
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out, or corroded terminals.
4. Perform any Technical Service Bulletins that may apply.

Were any problems found?

Yes

- Repair as necessary.
- Perform the PCM Verification Test. PCM Verification Test.

No

- Replace the SCM.
- Perform the PCM Verification Test. PCM Verification Test.