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F–98 ON-BOARD DIAGNOSTIC DTC P0121 A6E397001084W18 Diagnostic procedure DTC P0121 Throttle position stuck close (lower than expected)/open (higher than expected) DETECTION CONDITION • If PCM detects that throttle valve opening angle is below 12.5% for 5 s after following conditions are met, PCM determines that TP is stuck closed: MONITORING CONDITION — Engine coolant temperature above 80 °C {176 °F} — MAF sensor signal above 32.0 g/s {4.2 lb/minutes} • If PCM detects that throttle valve opening angle is above 50% for 5 seconds after following conditions are met, the PCM determines that TP is stuck open: MONITORING CONDITION — Engine speed above 500 rpm Diagnostic support note • This is a continuous monitor (CCM). • MIL illuminates if PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM. • PENDING CODE is available if PCM detects the above malfunction condition. • FREEZE FRAME DATA is available. • DTC is stored in the PCM memory. POSSIBLE CAUSE • TP sensor malfunction • Electrical corrosion in TP signal circuit • Voltage drops in constant voltage supply circuit • Voltage drops in ground circuit • MAF sensor malfunction • PCM malfunction STEP INSPECTION ACTION 1 VERIFY FREEZE FRAME DATA HAS BEEN • Has FREEZE FRAME DATA been recorded? Yes Go to next step. No Record FREEZE FRAME DATA on repair order, then go to 2 VERIFY RELATED PENDING CODE OR • Turn ignition key to ON (Engine OFF). • Retrieve pending or stored DTC using WDS or equivalent. • Is DTC P0101 also retrieved? Yes Go to DTC P0101 troubleshooting procedure. No Go to next step. 3 VERIFY RELATED SERVICE INFORMATION • Check for related Service Information availability. • Is any related Service Information available? Yes Perform repair or diagnosis according to available Service Information. • If vehicle is not repaired, go to next step. No Go to next step. 4 VERIFY CURRENT INPUT SIGNAL STATUS - IS • Start the engine. • Access ECT, TP and MAF PIDs using WDS or equivalent. • Warm up the engine until ECT PID is above 80 °C {176 °F} • Drive the vehicle. • Read TP PID while MAF PID is above 32.0 g/s {4.2 lb/min.}. • Is TP PID reading above 12.5%? Yes Go to Step 7. No Go to next step. 5 VERIFY TP PID • Start engine. • Access TP, MAF and RPM PIDs using WDS or equivalent. • Read TP PID while MAF PID is below 4.8 g/s {0.6 lb/min.} and RPM PID is above 500 rpm. • Is TP PID reading above 50%? Yes Go to Step 12. No Go to next step. |