Reducing Agent Line Heater (Heating Circuit 2) - Z104-, CHECKING

General Description

TheReducing Agent Line Heater (Heating Circuit 2) -Z104- is controlled by the Reducing Agent Heater Control Module -J891- to prevent freezing of the reducing agent.

Special tools and workshop equipment required

Multimeter.
Wiring Diagram.

Test Requirements

Fuses OK.
Battery voltage OK.
Switch OFF all electrical and electronic accessories.
Vehicles with Auto. Transmission, ensure Selector Lever position is in "P".
Vehicles with Man. Transmission, ensure Shifter Lever position is in "N" with Parking Brake applied.
Observe all safety precautions, refer to SAFETY PRECAUTIONS .
View clean working conditions, refer to CLEAN WORKING CONDITIONS .
For Hybrid vehicles refer to: HIGH VOLTAGE SYSTEM GENERAL WARNINGS .

Test Procedure

Step	Procedure	Result / Action to Take
1	PERFORM: Preliminary Check to verify the customers complaint. Refer to PRELIMINARY CHECK . -- Was Complaint verified?	-- YES: GO TO: Step 2 -- NO: GATHER more Information from customer about the complaint.
2	IGNITION: OFF. DISCONNECT:Reducing Agent Heater Control Module -J891- harness connectors. IGNITION: ON. CHECK: Reducing Agent Heater Control Module -J891- harness connector terminal 3 and 5 to ground for voltage. SPECIFIED VALUE: Battery voltage. IGNITION: OFF. -- Was Value obtained?	-- YES: GO TO: Step 3 -- 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 4
3	REMOVE: Reducing Agent Line Heater (Heating Circuit 2) -Z104-. Refer to appropriate repair information. CHECK: Reducing Agent Line Heater (Heating Circuit 2) -Z104- harness connector terminal 2 to the Reducing Agent Heater Control Module -J891- harness connector 1 for resistance. CHECK: Reducing Agent Line Heater (Heating Circuit 2) -Z104- harness connector terminal 1 to ground for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Were Values obtained?	-- YES: REPLACE: Reducing Agent Line Heater (Heating Circuit 2) -Z104-. Refer to appropriate repair information. 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. GO TO: Step 4
4	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.