ECS Resistance Tests

The ECS can be checked using an volt/ohmmeter. Before making resistance tests, turn ignition off and disconnect wiring connectors at ECU. Insert volt/ohmmeter probes into wiring connectors from wire side. Measure resistance at connector terminals, NOT ECU terminals.

TROUBLE CODES & PROBABLE CAUSE FOR CODES

Code No.	Probable Cause
2 & 3	Air Flow Meter or Circuit, ECU
4	Coolant Temp. Sensor or Circuit, ECU
5	Oxygen Sensor or Circuit, ECU
6	Ignition System Circuit, Distributor, Coil, Ignitor, ECU
7	Throttle Position Sensor or Circuit, ECU

Fig 1: Electronic Control Unit Connector Identification Some models may not have all terminals shown on connector above, but terminal locations are identical on all models.