490

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 glow plug although glow plug relay circuit is normal, Inspect the glow plug relay.

IG KEY "OFF", ENGINE "OFF"

Remove the glow plug 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 "85" and terminal "86".

Specification : 55Ω ± 10 % (20℃)

Measure the resistance between terminal "30" and terminal "87".

Specification : Discontinuity (Infinite Ω)

Actuate the relay by suppling battery power and chassis ground at terminal "85", "86".

Specification : Contacts are connected.

Measure the voltage between terminal "30" and terminal "87" 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)

DTC "P0670 Glow relay circuit malfunction" is displayed, engine hard starting occurs at cold starting and exhaust fumes are discharged because battery power is not supplied to glow plug.

Replace the glow plug relay.

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

DTC "P0670 Glow relay circuit malfunction" is displayed, engine hard starting occurs at cold starting and exhaust fumes are discharged because battery power is not supplied to glow plug.

ECM can be damaged. (According to short condition over current is supplied to relay control circuit in the ECM.)

Replace the glow plug relay.

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

Engine hard starting occurs at cold starting and exhaust fumes are discharged intermittently because battery power is not supplied to glow plug.

Replace the glow plug relay.