DTC P1229: Accelerator Pedal Position (APP) Sensor 2 Circuit High Voltage Check the DTC. Are there other DTCs P1627, P1628 (beside DTC P1229 being output? YES – Go to DTC P1627, P1628 chart (5 V reference #2 circuit failure). NO – Go to step 2. Check for the following conditions: Damaging APP sensor An incorrect APP sensor fixing Damaging accelerator pedal Is a problem found? YES – Repair as necessary. NO – Go to step 3. Turn the ignition switch ON (II). Check the APP with the scan tool. Is about 0 % indicated? YES – Go to step 5. NO – Go to step 6. Press the accelerator pedal. Is about 0 (Idle) – 100 % (WOT) indicated? YES – Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the APP sensor and at the ECM. NO – Go to step 6. Turn the ignition switch OFF. Disconnect the APP sensor 6P connector. Turn the ignition switch ON (II).

Measure voltage between the APP sensor 6P connector terminals No. 4 and No. 6. (For example; Right handle) Wire side of female terminals Is there about 5 V? YES – Go to step 11. NO – Go to step 10. Measure voltage between the ECM connector terminals A 79 and 81. Is there about 5 V? YES – Repair open in the wire between ECM and the APP sensor. NO – Substitute a known-good ECM and recheck. If symptom/indication goes away, replace the original ECM. aaa