P0591-SPEED CONTROL SWITCH 2 PERFORMANCE
P0591-SPEED CONTROL SWITCH 2 PERFORMANCE
For a complete wiring diagram, refer to the Wiring Information.
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Theory of Operation
The Speed Control Switches are located in the Right Steering Wheel Switch. The Right Steering Wheel Switch is hardwired to the Powertrain Control Module (PCM) via the clockspring pass-through within the Steering Column Control Module (SCCM). The SCCM is located near the top of the steering column below the steering wheel. The SCCM includes the steering column shroud, the Steering Angle Sensor (SAS), the Clockspring, the Multi-function Switch, a Steering Column Power Tilt and Telescope Switch (if equipped), and a trim cover.
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When Monitored:
Continuously with the ignition on.
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Set Condition:
The Powertrain Control Module (PCM) has detected that a non-permissable combination has occurred in the Speed Control Switch.
Possible Causes |
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| S/C SIGNAL 2 AND S/C SWITCH GROUND CIRCUITS |
| SPEED CONTROL SWITCH (RIGHT STEERING WHEEL SWITCH) |
| CLOCKSPRING |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
Turn the ignition off disconnect
the 12-volt battery and wait two minutes before proceeding. Failure
to follow these instructions may result in possible serious or fatal
injury.
WARNING:
Do not place an intact non-deployed
airbag face down on a hard surface, the airbag propels into the air
if accidentally deployed. Failure to follow these instructions may
result in possible serious or fatal injury.
WARNING:
| 1. | Turn the ignition on, engine not running. |
| 2. | With the scan tool, read DTCs |
Does the scan tool display this DTC as active?
Yes
- Go To 2
No
- Perform the INTERMITTENT DTC diagnostic procedure (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
2. (V937) S/C SWITCH GROUND CIRCUIT
| 1. | Turn the ignition off. |
| 2. | Remove the Driver Air Bag in accordance with the Service Information (Refer to 10 - Restraints/AIR BAG, Driver/Removal) . |
| 3. | Disconnect the Right Steering Wheel Switch harness connector. |
| 4. | Turn the ignition on, engine not running. |
| 5. | Measure the voltage between the (V937) S/C Switch Ground circuit and the (V72/V38) S/C Signal 2 circuit at the Steering Wheel Jumper harness connector. |
Is the voltage between 4.5 and 5.2 Volts DC?
Yes
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NOTE: Visually and physically inspect the wiring harness between the Right Steering Wheel Switch harness connector and the SCM C2 harness connector. Repair any damaged wires, connectors, and open/spread terminals. If harness is OK, proceed with test. - Replace the Right Steering Wheel Switch in accordance with the Service Information (Refer to 08 - Electrical/8P - Speed Control/SWITCH, Speed Control/Removal) .
- Perform the POWERTRAIN VERIFICATION TEST (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
- Perform the INTERMITTENT CONDITION diagnostic procedure (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).