4406767

Check water heater relay 1.

(1)

Ignition "OFF" & Engine "OFF".

(2)

Disconnect water heater relay.

(3)

Measure resistance between terminal 2 and 3 of water heater relay connector (Component side).

Specification : 50 ~ 60Ω

(4)

Is the measured resistance within specifications ?

YES

▶ Go to " Check for water heater relay operation " as below.

▶ Substitute with a known-good Main relay and check for proper operation.

If the problem is corrected, replace main relay and then go to "Verification of Vehicle Repair" procedure.

Check water heater relay operation.

(1)

Ignition "OFF" & Engine "OFF".

(2)

Connect water heater relay 1,2 and 3 and disconnect ECM connector.

(3)

Connect volt meter or test lamp with terminal 3 of water heater connector.

(4)

Ignition "ON" & Engine "OFF".

(5)

Ground terminal 23 of ECM harness connector to operate water heater relay. Or,

Check that water heater relay operates after Engine starts(Perform this test under 60°C).

caution

Time to operate water heater relay should not be over than 3 sec.

Because water heater plug can be damaged or Battery can be discharged.

(6)

Is the power supplied to water heater plug by operating water heater relay ?

YES

▶ Substitute with a known-good ECM and check for proper operation.

If the problem is corrected, replace ECM and then go to "Verification of Vehicle Repair" procedure.

▶ Substitute with a known-good ECM and check for proper operation.

If the problem is corrected, replace ECM and then go to "Verification of Vehicle Repair" procedure.