Description

When main relay (Engine control relay) is NOT operated although IG S/W 'ON' signal circuit and main relay circuit are normal. Inspect the ECM ground.

Diagnostic Procedure
ECM ground inspection
1.

IG S/W '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 S/W '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