Test Procedure

Step	Procedure	Result / Action to Take
1	PERFORM: Preliminary Check to verify the customers concern. Refer to PRELIMINARY CHECK . -- Was Complaint verified?	-- YES: GO TO: Step 2 -- NO: GATHER more information from customer about the complaint.
2	Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY . -- Are fault codes present for the Glow Plugs -- ?	-- YES: GO TO: Step 5 -- NO: GO TO: Step 3
3	IGNITION: OFF. DISCONNECT: Automatic Glow Time Control Module -J179- harness connector. IGNITION: ON. CHECK: Automatic Glow Time Control Module -J179- harness connector T11 / 6 and T11 / 11 to ground for voltage. CHECK: Automatic Glow Time Control Module -J179- harness connector T11 / 7 to Battery voltage for voltage. IGNITION: OFF. SPECIFIED VALUE: Battery voltage. -- Were Values obtained?	-- YES: GO TO: Step 4 -- NO: PERFORM: Visual Inspection of wiring and component. CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals. REPAIR: Faulty wiring or connector. REPLACE: Any open fuses. GO TO: Step 7
4	REMOVE: Engine Control Module -J623-. Refer to appropriate repair information. CHECK: Automatic Glow Time Control Module -J179- harness connector terminal 10 to Engine Control Module -J623- harness connector T91 / 55 for resistance. SPECIFIED VALUE: 0.5 [Ω] (+/- 0.3 Ω). -- Was Value obtained?	-- YES: REPLACE: Automatic Glow Time Control Module -J179-. Refer to appropriate repair information. GO TO: Step 7 -- NO: PERFORM: Visual Inspection of wiring and component. CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals. REPAIR: Faulty wiring or connector. GO TO: Step 7
5	IGNITION: OFF. DISCONNECT: Automatic Glow Time Control Module -J179- harness connector. CHECK: The suspected Glow Plug -- (Per DTC Stored) harness connector T11 / xx to ground for resistance (refer to the appropriate wiring diagram for terminal and connector location). SPECIFIED VALUE: 1.3 Ω (+/- 0.3 Ω at about 20° C). -- Was Value obtained?	-- YES: GO TO: Step 6 -- NO: REPLACE: The suspected Glow Plug --. Refer to appropriate repair information. GO TO: Step 7
6	CHECK: Automatic Glow Time Control Module -J179- harness connector T11 / xx to suspected Glow Plug -- harness connector terminal x for resistance (refer to the appropriate wiring diagram for terminal and connector location). SPECIFIED VALUE: 0.5 [Ω] (+/- 0.3 Ω). -- Was Value obtained?	-- YES: REPLACE: Automatic Glow Time Control Module -J179-. Refer to appropriate repair information. GO TO: Step 7 -- NO: PERFORM: Visual Inspection of wiring and component. CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals. REPAIR: Faulty wiring or connector. GO TO: Step 7
7	Final Procedure Perform a road test to verify repair. -- Does the original DTC return?	-- YES: CHECK: Engine Control Module -J623- harness connector for any damaged, pushed-out pins. REPAIR: As necessary. If all electrical connections are OK: REPLACE: Engine Control Module -J623-. Refer to appropriate repair information. Clear the DTC's. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY . Repair is complete. Generate Readiness Code. Refer to READINESS CODE . Return vehicle to Customer. -- NO: Perform the diagnostic procedure for any DTC's. If no DTC's return the repair is complete. Return vehicle to customer.