2000 Jaguar XJRFACTORY OEM SERVICE PROCEDURE

Acceleration Control - Diagnostic Procedures: Notes

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  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 code reader to retrieve fault codes before proceeding to the Symptom Chart.
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 .
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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