Diagnostic Procedures
- If powertrain diagnostic system check was performed, go to next step. If powertrain diagnostic system check was not performed, go to POWERTRAIN DIAGNOSTIC SYSTEM CHECK under DIAGNOSTIC SYSTEM CHECKS. After performing powertrain diagnostic system check, go to next step.
- Turn ignition on. Using scan tool, observe APP sensor 3 voltage. If voltage is 0.5-1.3 volts, go to next step. If voltage is not 0.5-1.3 volts, go to step 4.
- Using scan tool, observe the APP sensor AGREE/DISAGREE parameters. Slowly depress accelerator pedal, stopping briefly at 25, 50 and 75 percent, to Wide Open Throttle (WOT). Then slowly return to a closed position stopping briefly at 75, 50 and 25 percent. If scan tool indicates AGREE for all APP sensor agree/disagree parameters, go to DIAGNOSTIC AIDS . If scan tool does not indicate AGREE for all APP sensor agree/disagree parameters, go to next step.
- Replace TAC module. See REMOVAL, OVERHAUL & INSTALLATION - CARS article. After repairs, go to next step.
- Using scan tool, clear DTCs. Turn ignition off for at least 30 seconds. Start engine and allow it to reach normal operating temperature. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, go to step 2.
- Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no undiagnosed DTCs are displayed, system is okay.