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P0591






P0591-SPEED CONTROL SWITCH 2 PERFORMANCE





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

- When Monitored:
With the ignition key on.

- Set Condition:
S/C switch voltage output is not out of range but it does not equal any of the values for any of the button positions. One trip fault.





WARNING: On vehicles equipped with the high voltage system, you must thoroughly read and follow all High Voltage Safety procedures. In addition, before performing any diagnostic or service procedure near a high voltage component, you must perform the High Voltage Power Down. Failure to follow these instructions may result in possible serious or fatal injury

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. ACTIVE DTC
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 may 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 DTC active at this time?

Yes

- Go To 2

No

- Perform the INTERMITTENT CONDITION Diagnostic Procedure. . Intermittent Condition Test

2. SPEED CONTROL SWITCHES
1. Turn the ignition off.
2. Remove the Speed Control Switches from the steering wheel.
3. Measure the resistance across each Speed Control Switch.
4. Monitor the ohmmeter while pressing each function button on each switch.
5. The following resistance specs are taken between terminals (V38) S/C Switch No.2 signal and (V937) S/C Switch Return circuits of the Switch when holding the switch button in the following position.
- Not pressing any switch - 20.5k Ohms
- On/Off - 8.87k Ohms
- Set - 0.825k Ohms
- Coast - 0.47k Ohms
- Cancel - 3.92k Ohms
- Resume/Accel - 1.87k Ohms

6. The following resistance specs are taken between terminals (V37) S/C Switch No.1 Signal and (V937) S/C Switch Return circuits of the Switch when holding the switch button in the following positions:
- Not pressing any switch - 20.5k Ohms
- On/Off - 0.47k Ohms
- Set - 5.49k Ohms
- Coast - 2.94k Ohms
- Cancel - 1.24k Ohms
- Resume/Accel - 15.4k Ohms

Does the function on the Speed Control Switches have the correct resistance value?

Yes

- Go To 3

No

- Replace the Speed Control Switch that had the incorrect resistance value.
- Perform the INTERMITTENT CONDITION Diagnostic Procedure. . Intermittent Condition Test

3. (V38) S/C SWITCH NO.2 SIGNAL CIRCUIT SHORTED TO VOLTAGE




1. Disconnect the C3 PCM harness connector.
2. Ignition on, engine not running.
3. Measure the voltage of the (V38) S/C Switch No.2 signal circuit in the S/C Switch harness connector.

Is there any voltage present?

Yes

- Repair the short to voltage in the (V38) S/C Switch No.2 signal circuit.
- Perform the INTERMITTENT CONDITION Diagnostic Procedure. . Intermittent Condition Test

No

- Go To 4

4. CLOCKSPRING








1. Turn the ignition off.
2. Disconnect the C1 and C3 Clockspring harness connectors.
3. Measure the resistance of the (V38) S/C Switch No.2 signal circuit between the C1 and C3 Clockspring harness connectors.
4. Measure the resistance of the (V937) S/C Switch Return circuit between the C1 and C3 Clockspring harness connectors.

Is the resistance greater than 5 Ohms?

Yes

- Replace the Clockspring.
- Perform the INTERMITTENT CONDITION Diagnostic Procedure. . Intermittent Condition Test

No

- Go To 5
- NOTE: Connect the Clockspring harness connectors before continuing.


5. (V38) S/C SWITCH NO.2 SIGNAL CIRCUIT OPEN




1. Turn the ignition off.

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install PCM Pinout Box 8815 to perform diagnosis.

2. Measure the resistance of the (V38) S/C Switch No.2 signal circuit from both Speed Control harness connectors to the appropriate terminal of special tool #8815.

Is the resistance less than 5.0 Ohms for both measurements?

Yes

- Go To 6

No

- Repair the open in the (V38) S/C Switch No.2 signal circuit.
- Perform the INTERMITTENT CONDITION Diagnostic Procedure. . Intermittent Condition Test

6. (V937) S/C SWITCH RETURN OPEN





NOTE: The measurement must be taken from both Speed Control Switch harness connectors.

1. Measure the resistance of the (V937) S/C Switch Return circuit from the Speed Control harness connector to the appropriate terminal of special tool #8815.

Is the resistance less than 5.0 Ohms for both measurements?

Yes

- Go To 7

No

- Repair the open in the (V937) S/C Switch Return circuit.
- Perform the INTERMITTENT CONDITION Diagnostic Procedure. . Intermittent Condition Test

7. (V38) S/C SWITCH NO.2 SIGNAL CIRCUIT SHORTED TO GROUND




1. Measure the resistance between ground and the (V38) S/C Switch No.2 signal circuit in the Speed Control harness connector.

Is the resistance less than 100 Ohms?

Yes

- Repair the short to ground in the (V38) S/C Switch No.2 signal circuit.
- Perform the INTERMITTENT CONDITION Diagnostic Procedure. . Intermittent Condition Test

No

- Go To 8

8. (V38) S/C SWITCH NO.2 SIGNAL CIRCUIT SHORTED TO THE (V937) S/C SWITCH RETURN CIRCUIT




1. Measure the resistance between the (V38) S/C Switch No.2 signal circuit and the (V937) S/C Switch Return circuit in the Speed Control harness connector.

Is the resistance less than 5.0 Ohms?

Yes

- Repair the short between the (V38) S/C Switch No.2 signal circuit and the (V937) S/C Switch Return circuit.
- Perform the INTERMITTENT CONDITION Diagnostic Procedure. . Intermittent Condition Test

No

- Go To 9

9. SPEED CONTROL SWITCH VOLTAGE VALUES

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install PCM Pinout Box 8815 and PCM Pinout Box Adapter 8815-1 to perform diagnosis.

1. Install Miller Special Tool #8815-1 on the C3 PCM harness connector.
2. Connect the S/C Switch harness connectors.
3. Connect the Clockspring harness connectors.
4. Turn the ignition on.
5. With the scan tool, monitor the S/C Switch voltage readings.
6. Using a voltmeter check the voltage on the (V37) S/C Switch No.1 signal circuit and the (V38) S/C Switch No.2 signal circuit at the appropriate terminals of the special tool #8815.
7. Monitor the voltmeter.
8. With the scan tool, monitor the S/C Switch voltage readings.
9. Compare the voltage readings on the voltmeter to what the scan tool displayed.





Are the voltage readings out of the listed specification and is there less than a 0.2 Volt difference between the voltmeter switch values and the scan tool switch values?

Yes

- Verify that there is good pin to terminal contact in the Switch and PCM connectors. If OK, replace the Speed Control Switch.
- Perform the INTERMITTENT CONDITION Diagnostic Procedure. . Intermittent Condition Test

No

- Go To 10

10. POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Speed Control Switch and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals. Verify there is good pin to terminal contact in the Switch and PCM connectors.
4. Search for any Technical Service Bulletins (TSBs) that may apply.

Were there any problems found?

Yes

- Repair as necessary.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

No

- Replace and program the PCM.
- Perform the INTERMITTENT CONDITION Diagnostic Procedure. . Intermittent Condition Test

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