- Check the RP sensor signal voltage.
Is about 5 V indicated?
YES – Substitute a known-good ECM and recheck. If symptom/indication goes away, replace the original ECM. 
NO – Go to step 12.
- Turn the ignition switch OFF.
- Measure the resistance of RP sensor.
Is there 0.9 – 1.3 Kohms (At room temperature: about 20°C (68°F))?
YES – Substitute a known-good ECM and recheck. If symptom/indication goes away, replace the original ECM.
NO – Replace the RP sensor.
| NOTICE |
The battery power supply short circuit to 5 V power supply damages the ECM.
DTC P0223: Accelerator Pedal Position (APP) Sensor 1 Circuit High Voltage
- Check the DTC.
Are there other DTCs P1625, P1618 (beside DTC P1223) being output?
YES – Go to DTC P1625, P1618 chart (5 V reference #1 circuit failure)
NO – Go to step 2.
- Check for the following conditions:
- Damaging APP sensor
- An incorrect APP sensor fixing
- Damaging accelerator pedal and wire
Is a problem found?
YES – Repair as necessary.
NO – Go to step 3.
- Turn the ignition switch ON (II).
- Check the TP (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).