Acceleration Control (2003.5-09): Specifications Jaguar XJR III

Torque Specifications

TORQUE SPECIFICATIONS CHART

Scheme 144

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. While 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 limp home mode.

1. Verify the customer concern by operating the system.
2. Visually inspect for obvious signs of mechanical or electrical damage.
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. If the concern is not visually evident, use a fault code reader to retrieve fault codes before proceeding to the Symptom Chart.

DTC P1240, P1241, P1242

Possible Source(s)

1. Accelerator pedal power supply circuit out of range Action(s) to take: GO to Pinpoint Test A.

DTC P1122, P1123, P1215, P1216, P1344

Possible Source(s)

1. Accelerator pedal demand sensor output circuit out of range Action(s) to take: GO to Pinpoint Test B.

DTC P0121,P0122, P0123

Possible Source(s)

1. Throttle position sensor circuit out of range Action(s) to take: GO to Pinpoint Test C.

DTCP1251, P1658, P1631, P1657

Possible Source(s)

1. Throttle motor relay failure Action(s) to take: GO to Pinpoint Test D.

DTC P1243

Possible Source(s)

1. Accelerator pedal demand sensor ground; open circuit Action(s) to take: GO to Pinpoint Test E.

DTC P1611,P1633

Possible Source(s)

1. Engine control module (ECM) failure Action(s) to take: INSTALL a new ECM. For additional information, refer to «ELECTRONIC ENGINE CONTROLS - 3.5L/4.2L (2003.5-09)»(ref-213470) .

DTCP1254, P1250

Possible Source(s)

1. Throttle limp home spring malfunction. Action(s) to take: INSTALL a new throttle body. For additional information refer to «ELECTRONIC ENGINE CONTROLS - 3.5L/4.2L (2003.5-09)»(ref-213470) .