2142502

1.

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.

2.

Check the following conditions:

(1)

Check for damaged harness and terminals: contact resistance, oxidation, bent or broken terminals.

(2)

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

caution

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

3.

Has a problem been found?

YES

a.

Repair as necessary and go to "Verification of Vehicle Repair" procedure

NO

a.

System OK. Go to "Verification of Vehicle Repair" procedure

1.

Turn ignition switch to ON

2.

Measure the battery voltage between ECM harness connector and chassis ground.

3.

Probe(+) : ECM harness connector NO27,6,7,47.

Probe(-) : Chassis ground

a.

Specification: Approximately 12V

4.

Is the voltage within specification?

YES

a.

Go to "SHORT CIRCUIT INSPECTION FOR POWER LINE"

NO

a.

Open circuit between INJ harness connector and ECM harness connector

b.

Short to chassis ground between INJ harness connector and ECM harness connector

c.

Open circuit or short circuit to chassis ground between INJ harness connector and control relay

d.

Repair as necessary and go to "Verification of Vehicle Repair" procedure

caution

In case the voltage between terminal 1 of injector and terminal 27,6,7 and 47 of ECM is 1V respectively.

Suspect area : Open or short circuit of power line from injector to ECM.

5.

Turn ignition switch to OFF ,then disconnect ECM harness connector and injector harness connector.

6.

Measure the resistance of injector ground circuit between injector harness connector and INJ bettery power circuit.

7.

Probe(+) : Injector harness connector NO2.

Probe(-) : Chassis ground.

a.

Specification: infinite

8.

Does each resistance indicate continuity circuit?

YES

a.

Go to "Component Inspection"

NO

a.

Short circuit between injector signal circuit and chassis ground

b.

Repair as necessary and go to "Verification of Vehicle Repair" procedure