Many malfunctions in the electrical system are caused by poor harness(s) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.

Check the following conditions:

(2)

Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection

note

Use a suitable male pin to ensure that contact in sockets is good. The pin should remain in position when pulled gently.

Has a problem been found?

YES

NO

Remove the main relay.

Ignition "ON" & Engine "OFF".

Measure the voltage between terminal 21 of the main relay and chassis ground.

1)

Specification : Approx. B+

Is voltage display near the specified value?

YES

NO

Ignition "OFF" & Relay connector : Disconnected

Measure resistance between terminal 22 of the Engine control relayelay and chassis ground

1)

Specification : Infinite

Is resistance within specification?

YES

NO

With Ignition "OFF", disconnect relay and ECM connectors

Ignition "ON" and Engine "OFF"

Measure voltage between terminal 22 of the Engine control relay and chassis ground

1)

Specification : Approx 0V

Is voltage within specification?

YES

NO

With Ignition "OFF", disconnect relay amd ECM connectors

Measure resistance between terminals 22 of the Engine control relay and ECM(23/C23-2)

1)

Specification : Approx 0Ω

Is resistance within specification?

YES

NO