Description

When main relay (Engine control relay) is NOT operated although IG KEY "ON" signal circuit and main relay circuit are normal. Inspect the ECM ground.

Diagnostic Procedure
ECM ground inspection
1.

IG KEY "OFF" , ENGINE "OFF"

2.

Disconnect ECM connector.

3.

Measure resistance between ground terminals of ECM harness connector and chassis ground.

■ Specification : Below 0.2 Ω

Symptom

Inspection procedure

Case1

● ECM grounds are normal.

● When Main relay is not operated although IG KEY "ON" signal circuit, main relay circuit and ground circuit are normal.

● Replace ECM

Case2

● There is discontinuity or high resistance between ground terminals of ECM harness connector and chassis ground.

● Repair chassis ground point.

● Repair open in ground circuit.

Яндекс.Метрика