1.CHECK POWER SUPPLY TO EGR VALVE.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the EGR valve.
3) Turn the ignition switch to ON.
4) Measure the voltage between EGR valve connector and engine ground.
Connector & terminal
(E18) No. 2 (+) — Engine ground (−):
(E18) No. 5 (+) — Engine ground (−):
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Is the voltage 10 V or more?
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Repair the harness and connector.
NOTE:
In this case, repair the following item:
• Open circuit in harness between EGR valve and main relay connector
• Poor contact of coupling connector
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2.CHECK HARNESS BETWEEN ECM AND EGR VALVE CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from the ECM.
3) Measure the resistance between ECM and EGR valve connector.
Connector & terminal
DTC P1492; (B134) No. 14 — (E18) No. 6:
DTC P1494; (B134) No. 24 — (E18) No. 1:
DTC P1496; (B134) No. 13 — (E18) No. 4:
DTC P1498; (B134) No. 23 — (E18) No. 3:
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Is the resistance less than 1 Ω?
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Repair the harness and connector.
NOTE:
In this case, repair the following item:
• Open circuit in harness between ECM and EGR valve connector
• Poor contact of coupling connector
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3.CHECK HARNESS BETWEEN ECM AND EGR VALVE CONNECTOR.
1) Disconnect the connectors from the ECM.
2) Measure the resistance between ECM and chassis ground.
Connector & terminal
DTC P1492; (B134) No. 14 — Chassis ground:
DTC P1494; (B134) No. 24 — Chassis ground:
DTC P1496; (B134) No. 13 — Chassis ground:
DTC P1498; (B134) No. 23 — Chassis ground:
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Is the resistance 1 MΩ or more?
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Repair the ground short in harness between ECM and EGR valve connector.
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4.CHECK FOR POOR CONTACT.
Check for poor contact in ECM and EGR valve connector.
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Is there poor contact in ECM or EGR valve connector?
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Repair the poor contact in ECM or EGR valve connector.
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Replace the EGR valve. 
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