Specifications
| Description | Nm |
|---|---|
| Accelerator pedal | 10 |
Torque Specifications
Scheme 294
| Item Number | Description |
|---|---|
| 1 | Engine control module (ECM) |
| 2 | Throttle body. (Vehicles with supercharger) |
| 3 | Accelerator pedal |
| 4 | Throttle body. (Vehicles without supercharger) |
When the accelerator pedal is applied, the two accelerator position sensors measure the pedal movement and provide an output voltage proportional to pedal movement to the engine control module (ECM). Two sensors are used as a safety feature. The accelerator pedal has two return springs to guarantee the accelerator returns to the zero position when the pedal is released. Whilst comparison checks are carried out on the accelerator pedal for rational values, communications within the ECM are monitored for rational values and responses.
The ECM then provides an output, based on the accelerator pedal position, which drives a DC motor which positions the throttle blade at the requested angle. The throttle blade position is monitored by two sensors for rational value.
The acceleration control system has the necessary safety features to monitor the correct operation of all the components. Depending on the failure state, the acceleration control system can be put in appropriate safe state, from restricting the RPM to limphome mode.
- Verify the customer concern by operating the system.
- Visually inspect for obvious signs of mechanical or electrical damage.
- If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
- If the concern is not visually evident, use a fault code reader to retrieve fault code reader to retrieve fault codes before proceeding to the Symptom Chart.
| Condition | Possible Source | Action |
|---|---|---|
| DTC P1240, P1241, P1242 | Accelerator pedal power supply circuit out of range | Go to Pinpoint Test A: DTC P1240, P1241, P1242 . |
| DTC P1122, P1123, P1215, P1216, P1344 | Accelerator pedal demand sensor output circuit out of range | Go to Pinpoint Test B: DTC P1122, P1123, P1215, P1216, P1344 . |
| DTC P0121, P0122, P0123 | Throttle position sensor circuit out of range | Go to Pinpoint Test C: DTC P0121, P0122, P0123 . |
| DTC P1251, P1658, P1631, P1657 | Throttle motor relay failure | Go to Pinpoint Test D: DTC P1251, P1658, P1631, P1657 . |
| DTC P1243 | Accelerator pedal demand sensor ground; open circuit | Go to Pinpoint Test E: DTC P1243 . |
| DTC P1611, P1633 | Engine control module (ECM) failure | INSTALL a new ECM. For additional information, refer to Electronic Engine Controls or Electronic Engine Controls . |
| DTC P1254, P1250 | Throttle limp home spring malfunction. | INSTALL a new throttle body. For additional information refer to Electronic Engine Controls or Electronic Engine Controls . |
Symptom Chart
See also:
• Electronic Engine Controls
• Electronic Engine Controls