10468836

ADDITIONAL WATER HEATER

1.

Possible DTC : P1635

＊ CC-CODE

(1)

C018 (Line : Short circuit)

A.

Possible causes of trouble :

Short circuit to Bat line, Open circuit in wiring

Fuse defective

Open circuit. Contact resistance

Additional water heater relay defective

(2)

C019 (Line : Open circuit)

A.

Possible causes of trouble :

Short circuit to Bat line, Open circuit in wiring

Fuse defective

Contact resistance

Additional water heater relay defective

2.

Measure the voltage at relay pin 85 to GND.

Set value :

8 ~ 15V (OFF)

0V (ON)

3.

Check the additional water heater relay wiring

4.

Measure the supply voltage at relay pin. 87 to GND.

Set value : 8 ~ 15V

5.

Check the additional water heater relay wiring

6.

Check wiring between ECU pin 23 and additional water heater relay.

7.

If wiring and fuse is OK, replace the additional water heater relay.

note

FO vehicle of which mounting combustive heater reveals the above trouble code normally. So please ignore the code.