ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC DETECTING CONDITION:

Immediately at fault recognition

TROUBLE SYMPTOM:

• Improper idling

• Poor driving performance

• Engine breathing

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode , and Inspection Mode .

WIRING DIAGRAM:

• Euro 4 model

• Euro 5 model

STEP	CHECK	YES	NO
1.CHECK HARNESS BETWEEN ECM AND EGR VALVE CONNECTOR. 1) Turn the ignition switch to OFF. 2) Disconnect the connectors from ECM and EGR valve. 3) Turn the ignition switch to ON. 4) Measure the voltage between ECM and chassis ground. Connector & terminal Euro 4 model DTC P1493; (B134) No. 15 (+) — Chassis ground (−): DTC P1495; (B134) No. 12 (+) — Chassis ground (−): DTC P1497; (B134) No. 14 (+) — Chassis ground (−): DTC P1499; (B134) No. 13 (+) — Chassis ground (−): Euro 5 model DTC P1493; (B134) No. 23 (+) — Chassis ground (−): DTC P1495; (B134) No. 14 (+) — Chassis ground (−): DTC P1497; (B134) No. 24 (+) — Chassis ground (−): DTC P1499; (B134) No. 13 (+) — Chassis ground (−):	Is the voltage 10 V or more?	Repair the short circuit to power supply in harness between ECM and EGR valve connector.
2.CHECK EGR VALVE. Measure the resistance between EGR valve terminals. Terminals DTC P1493; No. 2 — No. 3: DTC P1493; No. 5 — No. 3: DTC P1495; No. 2 — No. 6: DTC P1495; No. 5 — No. 6: DTC P1497; No. 2 — No. 1: DTC P1497; No. 5 — No. 1: DTC P1499; No. 2 — No. 4: DTC P1499; No. 5 — No. 4:	Is the resistance 20 Ω or more?	Repair the poor contact of ECM connector.	Replace the EGR valve.