DTC Logic

DTC DETECTION LOGIC

NOTE

:
If DTC P0470 is displayed with DTC P0651 or P2263, first perform trouble diagnosis for DTC P0651 or P2263.

Refer to EC-975, "DTC Logic" (P0651), EC-1003, "DTC Logic" (P2263).

Diagnosis Procedure

1.CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF and wait at least 20 seconds.

2. Check ground connection E38. Refer to Ground inspection in GI-44, "Circuit Inspection".

Is the inspection result normal? YES >> GO TO 2.

NO >> Repair or replace ground connection.

2.CHECK EXHAUST GAS PRESSURE SENSOR 1 POWER SUPPLY CIRCUIT

1. Disconnect exhaust gas pressure sensor 1 harness connector.

2. Turn ignition switch ON.

3. Check the voltage between exhaust pressure sensor 1 harness connector and ground.

Is the inspection result normal? YES >> GO TO 3.

NO >> Repair open circuit or short to ground or short to power in harness or connectors.

3.CHECK EXHAUST GAS PRESSURE SENSOR 1 GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF and wait at least 20 seconds.

2. Check the continuity between exhaust gas pressure sensor 1 harness connector and ECM harness connector.

3. Also check harness for short to ground and short to power.

Is the inspection result normal? YES >> GO TO 4.

NO >> Repair open circuit or short to ground or short to power in harness or connectors.

4.CHECK EXHAUST GAS PRESSURE SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Check the continuity between exhaust gas pressure sensor 1 harness connector and ECM harness connector.

2. Also check harness for short to ground and short to power.

Is the inspection result normal? YES >> GO TO 5.

NO >> Repair open circuit or short to ground or short to power in harness or connectors.

5.CHECK INTERMITTENT INCIDENT

Refer to GI-42, "Intermittent Incident".

Is the inspection result normal? YES >> Replace exhaust gas pressure sensor 1.

NO >> Repair or replace.