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

P1325/C018_C019

2.

Check items with the scan tool and the multimeter

① Wiring harness inspection

② Check the fuse

③ Check the relay resistance

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)

Relay resistance : 20 ~ 30 Ω at 20℃(68℉)

note

Refer to the component and full circuit for connector configrations details

C018 : Glow Relay - Short Circuit
4.

Turn the ignition switch ON and measure the voltage at the ECM terminal 15/C230-1 after the coolant temperature 60℃(140℉).

5.

IS THERE A BATTERY VOLTAGE ?

YES

a.

Go to step 3

NO

a.

Repair short in the wire between the glow relay terminal 1 and the glow fuse (80A)

b.

Repair short in the wire between the glow relay terminal 4 and the fuse No.3 (10A)

c.

Replace the fuse if the fuse is broken

d.

Replace the relay if the relay is defective after checking the continuity between the relay terminal 2 and terminal 4. For more detailed information, Go to "Component Inspection" procedure

e.

Go to step 3

6.

Check the glow relay operation when turning the ignition switch from OFF to ON.

note

To be sure the glow relay test, the coolant should be fixed below 60℃(140℉) at least. Glow plug indicator lamp lights briefly for self test when the ignition switch is turned ON.

7.

IS THE GLOW RELAY OPERATED ?

YES

a.

Go to "Verification of Vehicle Repair" procedure

NO

a.

Repair short in the wire between the glow relay terminal 2 and the ECM terminal 15/C230-1

b.

Go to step 5

8.

Turn the ignition switch ON

9.

Check the ground condition with the LED lamp at the ECM terminal 15/C230-1 directly.

10.

IS THERE LED GREEN LAMP(GROUND) LIGHTED ?

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

C019 : Glow Relay - Open or Short Circuit
11.

Disconnect the glow relay after turning the ignition switch ON, measure the voltage at the ECM terminal 15/C230-1 after the coolant temperature 60℃(140℉).

12.

IS THERE A BATTERY VOLTAGE ?

YES

a.

Go to step 4

NO

a.

Go to step 3

13.

ARE THE FUSES BLOWN ?

YES

a.

Repair open or short in the wire between the glow relay terminal 4 and fuse No.3 (10 A)

b.

Repair open or short in the wire between the glow relay terminal 1 and the glow fuse (80 A)

c.

Repair open or short in the wire between the glow relay terminal 2 and the ECM terminal 15/C230-1.

d.

Replace the fuse if the fuse is broken

NO

a.

Go to step 4

14.

Check the glow relay operation when turning the ignition switch from OFF to ON

note

To be sure the glow relay test, the coolant should be fixed below 60℃(140℉) at least. Glow plug indicator lamp lights briefly for self test when the ignition switch is turned ON.

15.

IS THE GLOW RELAY OPERATED ?

YES

a.

Go to "Verification of Vehicle Repair" procedure

NO

a.

Replace the relay if the relay is defective after checking the continuity between the relay terminal 2 and terminal 4. For more detailed information, Go to "Component inspection" procedure

b.

Recheck open or short in the wire between the glow relay terminal 2 and the ECM terminal 15/C230-1.

c.

Go to step 6

16.

Turn the ignition switch ON

17.

Check the ground condition with the LED lamp at the ECM terminal 15/C230-1.

18.

IS THERE LED GREEN LAMP(GROUND) LIGHTED ?

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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