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Home >> Chevrolet >> 2002 >> Camaro Base, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P1518: Loss Of Communication Between Pcm & Throttle Actuator Control Module >> Diagnostic Procedures

Diagnostic Procedures

  1. Did you perform the Diagnostic System Check-Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
    2. NOTE: If DTC P1120, P1220, P1221, P1515 or P1516 are set, refer to the appropriate DTC first for further diagnosis. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
  2. Operate the vehicle within Failure Records conditions. Does the scan tool indicate DTC P1518 failed this ignition cycle? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
  3. Turn OFF the ignition. Disconnect the TAC module. With the ignition OFF, measure the voltage of the TAC module ignition feed circuit using a DMM that is connected to a good ground. Is voltage at or near 0 V? If yes, go to next step. If no, go to step  9.
  4. Turn ON the ignition, with the engine OFF. Measure the voltage from the TAC module ignition feed circuit using a DMM that is connected to a good ground. Does the voltage measure at or near battery voltage? If yes, go to next step. If no, go to step  11.
  5. Test the TAC module ground circuits using a test lamp that is connected to battery voltage. Does the test lamp illuminate when probing both circuits? If yes, go to next step. If no, go to step  12.
  6. Test for voltage between both TAC module serial data circuits and a good ground using a DMM. Does the voltage measure 2-5 V? If yes, go to step  13. If no, go to next step.
  7. Does the voltage measure more than 5 V? If yes, go to step  10. If no, go to next step.
  8. Test for an open or short to ground in the serial data circuit. Did you find and correct the condition? If yes, go to step  17. If no, go to step  15.
  9. Repair the short to battery voltage in the ignition feed circuit. After repairs, go to step  17.
  10. Test for a short to voltage on the TAC module serial data circuit. Did you find and correct the condition? If yes, go to step  17. If no, go to step  16.
  11. Repair the open or short to ground in the ignition feed circuit. After repairs, go to step  17.
  12. Repair the open in the TAC module ground circuit. After repairs, go to step  17.
  13. Inspect for a faulty serial data connections at the TAC module. Did you find and correct the condition? If yes, go to step  17. If no, go to next step.
  14. Replace the TAC module. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to step  17.
  15. Inspect for faulty connections at the PCM. Did you find and correct the condition? If yes, go to step  17. If no, go to next step.
  16. Replace the PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  17. Clear the DTCs with a scan tool. Turn OFF the ignition. Start the engine. Operate the vehicle within the Conditions for Running DTC. Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  18. Observe the stored information, Capture Info with a scan tool. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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