DTC P1295: ACCELERATOR POSITION SENSOR (APPS) SUPPLY VOLTAGE TOO LOW
Monitor & Set Conditions
Accelerator Pedal Position Sensor (APPS) supply voltage is monitored when engine is running. DTC may be stored if low APPS signal circuit voltage exists, or low voltage is detected between Engine Control Module (ECM) and Powertrain Control Module (PCM).
Possible Causes
- APPS
- APPS Supply Circuit Short To Ground
- APPS Shorted To Sensor Ground
- APPS Shorted
- APPS Supply Circuit Open
- ECM
Testing
1. Turn ignition off. Disconnect APPS harness connector. APPS is located on bracket, just above fuel injection pump. Check for poor connection/terminal contact at APPS harness connector. Repair as necessary. Using DVOM, measure resistance between ground and terminal No. 5 (Dark Blue/White wire) on APPS harness connector. This is the APPS sensor supply wire and goes from terminal No. 5 on APPS harness connector to terminal No. 31 on ECM harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, go to step 5
2. Turn ignition on. Ensure APPS harness connector is still disconnected. Using DVOM, measure voltage between ground and terminal No. 5 (Dark Blue/White wire) on APPS harness connector. If voltage is 4.5 volts or less, go to next step. If voltage is greater than 4.5 volts, replace APPS. See appropriate REMOVAL, OVERHAUL & INSTALLATION article.
3. Ensure APPS harness connector is still disconnected. Turn ignition off. Disconnect ECM harness connector. ECM is located on driver's side of engine, just in front of fuel transfer pump and contains a 50-pin connector. Using DVOM, measure resistance between ground and terminal No. 5 (Dark Blue/White wire) on APPS harness connector. If resistance is 5 ohms or greater, go to next step. If resistance is less than 5 ohms, repair short to ground in Dark Blue/White wire between ECM and APPS.
4. Using DVOM, measure resistance between terminal No. 5 (Dark Blue/White wire) and terminal No. 11 (Black/Light Blue wire) on APPS connector. The Black/Light Blue wire is the sensor ground circuit. If resistance is 5 ohms or less, repair short between Dark Blue/White and Black/Light Blue wires. If resistance is greater than 5 ohms, replace and program ECM. See appropriate REMOVAL, OVERHAUL& INSTALLATION article.
5. Ensure APPS harness connector is still disconnected. Turn ignition on with engine off. Using DVOM, measure voltage between ground and terminal No. 5 (Dark Blue/White wire) on APPS connector. If voltage is 4.5 volts or less, go to next step. If voltage is greater than 4.5 volts, replace APPS. See appropriate REMOVAL, OVERHAUL & INSTALLATION article.
6. Turn ignition off. Ensure APPS harness connector is still disconnected. Disconnect ECM harness connector. ECM is located on driver's side of engine, just in front of fuel transfer pump and contains a 50-pin connector. Measure resistance of Dark Blue/White wire between terminal No. 5 on APPS harness connector and terminal No. 31 on ECM harness connector. If resistance is less than 5 ohms, replace and program ECM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. If resistance is 5 ohms or greater, repair open in Dark Blue/White wire between APPS and ECM.