Diagnostic Procedure
WARNING: This page is about a different car, the 2002 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.
- Turn ignition off. Loosen and retighten 2 engine ground bolts. See Figure and Figure . Disconnect electric throttle control actuator harness connector. See Figure and Figure . Turn ignition on. Measure voltage between ground and electric throttle control actuator harness connector terminal No. 1 (Red wire). If voltage is about 5 volts, go to step 4. If voltage is not about 5 volts, go to next step.
- Check short to ground and short to voltage in Red wire between ECM harness connector terminal No. 65 and the following:
- Electric throttle control actuator harness connector terminal No. 1.
- APP sensor harness connector terminal No. 2.
- MAF sensor harness connector terminal No. 2.
- EVAP-CSPS harness connector terminal No. 1.
- Refrigerant pressure sensor harness connector terminal No. 3.
See Figure and Figure . Also, check ECM and intermediate connectors in the circuit for damage and repair or replace as necessary and perform DTC CONFIRMATION TEST to verify repair. If ECM and intermediate connectors are OK, go to next step.
- Check the following:
- APP sensor. See step 4 in DTC P1227 OR DTC P1228 article.
- MAF sensor. See step 5 in DTC P0101, DTC P0102, DTC P0103 & P1102 article.
- EVAP-CSPS. See step 6 in DTC P0452: EVAP CONTROL SYSTEM PRESSURE SENSOR LOW INPUT article.
- Refrigerant pressure sensor. See SYSTEM & COMPONENT TESTING article.
If problem is found, repair as necessary and perform DTC CONFIRMATION TEST to verify repair. If problem is not found, go to step 6.
- Reconnect all harness connectors. Perform THROTTLE VALVE CLOSED POSITION LEARNING PROCEDURE . Turn ignition on. Shift transmission into Drive (A/T models) or first gear (M/T models). Measure voltage between ground and ECM terminals No. 73 (TP sensor No. 1 signal) and No. 74 (TP sensor No. 2 signal) by backprobing, with accelerator pedal in specified positions. See TP SENSOR VOLTAGE . If voltage is as specified, go to step 6. If voltage is not as specified, go to next step.
- Replace electric throttle control actuator. Perform the following:
- Perform THROTTLE VALVE CLOSED POSITION LEARNING PROCEDURE .
- Perform IDLE AIR VOLUME LEARNING PROCEDURE .
- Inspection is done.
- No problem is indicated at this time. Problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.