Terminal and Connector Inspection
Check for Wiring Harness
1.

Check for damaged harness and terminals including rubber seals :

-. contact resistance, oxidation, corrosion, bent or broken terminals

-. harness connector connection, loose wires etc.

2.

Check for poor connection between ECM and component :

-. backed out terminal, improper mating, broken locks and poor terminal to wire connection

3.

ARE THE WIRES O.K ? & ARE THE CONNECTIONS O.K ?

YES

a.

Go to "Signal Circuit Inspection" procedure

NO

a.

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

Signal Circuit Inspection
Problem Verification
1.

DTCs listed below are stored in the scan tool

P1623/C018

2.

Check items with the scan tool and the multimeter

① Wiring harness inspection

② Battery voltage from the fuse 19 (10A) to the engine check lamp

3.

Specification

1)

Resitance : below 1 Ω for open in the wire

2)

Resitance : infinite for short to ground in the wire

3)

Voltage : below 0.5V for short to power in the wire

4)

Battery voltage : Approx. 12V

note

Refer to the component and full circuit for connector configrations details

C018 ENG. CHK lamp - Short Circuit
4.

Turn the ignition switch ON and watch the MIL.

5.

IS THE ENGINE CHECK LAMP ON AFTER TRUNING THE IGNITION SWITCH ON ?

YES

a.

Intermittent failure, system is O.K at this time.

b.

Check for poor connections or losse wire between the dash fuse box and the ECM.

c.

Go to "Verification of Vehicle Repair" procedure

NO

a.

Replace the fuse if the fuse is broken

b.

Repair short in the wire between the fues No.19 (10A) and the ECM terminal 29/C230-2.

c.

Check for a blown MIL bulb and replace the bulb if the bulb is broken.

d.

Go to step 3

6.

Connect the ECM terminal 29/C230-2 to the body ground with a jumper wire directly.

7.

IS THE ENGINE CHECK LAMP LIGHT ON ?

YES

a.

Go to step 5

NO

a.

Recheck the fuse.

b.

Recheck short in the wire between the fuse No.19 (10A) and the ECM terminal 29/C230-2.

c.

Recheck for a blown engine check bulb and replace the bulb if the bulb is broken.

d.

Go to step 5

8.

Check the ground condition with the LED lamp at the ECM terminal 29/C230-2 after turning the ignition switch ON.

9.

IS THE LED (GREEN) LAMP ON ?

YES

a.

Go to "Verification of Vehicle Repair" procedure

NO

a.

Replace a known - good ECM and recheck. If the LED (green) lamp is ON, replace the ECM.

YES

a.

Go to "Verification of Vehicle Repair" procedure

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