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caution

First of all check damage of harness and terminals : Check terminals for contact resistance, corrosion and deformation.

When battery power is not supplied to fuel filter heater although fuel filter heater circuit is normal, Inspect the fuel filter relay.

IG KEY "OFF", ENGINE "OFF"

Remove the fuel filter relay from the fusible link box.

Before measuring resistance, you must calibrate(0Ω) the tester.

caution

"Multitester Calibration" of "Details Inspection(Equipment Setting)" reference

Measure the resistance between terminal "3" and terminal "5".

Specification : 92Ω ± 10 % (20℃)

Measure the resistance between terminal "1" and terminal "2".

Specification : Discontinuity (Infinite Ω)

Actuate the relay by suppling battery power and chassis ground at terminal "3", "5".

Specification : Contacts are connected.

Measure the voltage between terminal "1" and terminal "2" when relay is actuated.

Specification : Continuity (below 1.0 Ω)

※ If trouble symptom occurs intermittently although relay is operated well as above, Inspect the inside of the relay.

Case 1 : In case that relay coil resistance is high. (Open)

Engine hard starting occurs or engine starting is impossible at cold starting because battery power is not supplied to fuel filter heater coil. (Diesel fuel is frozen)

Replace the fuel filter relay.

Case 2 : In case that relay coil resistance is low. (Short)

ABS fuse (10A) on the U/H junction box is blown because of relay coil short.

Engine hard starting occurs or engine starting is impossible at cold starting because battery power is not supplied to fuel filter heater coil. (Diesel fuel is frozen)

Replace the fuel filter relay.

Case 3 : In case that relay coil is normal. (Intermittent poor contact connection)

Engine hard starting occurs or engine starting is impossible intermittently at cold starting because battery power is not supplied to fuel filter heater coil. (Diesel fuel is frozen)

Replace the fuel filter relay.