CHECK HARNESS BETWEEN ECM AND SECONDARY AIR PUMP RELAY.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from the ECM and secondary air pump relay.

3) Measure the voltage between ECM and chassis ground.

Connector & terminal

(B136) No. 8 (+) — Chassis ground (−):

QUESTION

Is the voltage 10 V or more?

Yes No

Repair short circuit of the harness to power supply between the ECM and secondary air pump relay.

Even if the malfunction indicator light illuminates, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

NOTE:

In this case, temporary poor contact of connector may be the cause.