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

General Description

TheReducing Agent Line Heater (Heating Circuit 2) -Z104- is controlled by theReducing Agent Metering System Control Module -J880- 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.
Coolant Temperature: ≥ 80° C.
Observe all safety precautions: SAFETY PRECAUTIONS .
View clean working conditions: CLEAN WORKING CONDITIONS .

Test Procedure

NOTE:

Allow vehicle to sit overnight as necessary to try and obtain an ambient temperature of 60° F.

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 Line Heater (Heating Circuit 2) -Z104- harness connector. CHECK: Reducing Agent Line Heater (Heating Circuit 2) -Z104- harness connector terminal 1 to 2 for resistance. SPECIFIED VALUE: 2.1 Ohms (+/- 1.0 Ohms). -- Was Value obtained?	-- YES: GO TO: Step 3 -- NO: GO TO: Step 4
3	REMOVE: Reducing Agent Metering System Control Module -J880-. Refer to appropriate repair manual. CHECK: Reducing Agent Line Heater (Heating Circuit 2) -Z104- harness connector terminal 2 to the Reducing Agent Metering System Control Module -J880- harness connector T30 / 15 for resistance. CHECK: Reducing Agent Line Heater (Heating Circuit 2) -Z104- harness connector terminal 1 to the Reducing Agent Metering System Control Module -J880- harness connector T30 / 18 for resistance. SPECIFIED VALUE: 0.5 Ω (± 1.0 Ω). -- Were Values obtained?	-- YES: GO TO: Step 8 -- 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 8
4	DISCONNECT: Each heater resistor element of the Reducing Agent Line Heater (Heating Circuit 2) -Z104- individually for testing. JUMPER: Pins at one end of Reducing Agent Line Heater (Heating Circuit 2) -Z104- injector return line and check across terminals at other end of Reducing Agent Line Heater (Heating Circuit 2) -Z104- injector return line for resistance. SPECIFIED VALUE: 0.5 Ohms (+/- 1.0 Ohms). -- Was Value obtained?	-- YES: GO TO: Step 5 -- NO: REPLACE: Reducing Agent Line Heater (Heating Circuit 2) -Z104- return line. Refer to appropriate repair manual. GO TO: Step 8
5	DISCONNECT: Each heater resistor element of the Reducing Agent Line Heater (Heating Circuit 2) -Z104- individually for testing. JUMPER: Pins at one end of Reducing Agent Line Heater (Heating Circuit 2) -Z104- injector supply line and check across terminals at other end of Reducing Agent Line Heater (Heating Circuit 2) -Z104- injector supply line for resistance. SPECIFIED VALUE: 0.4 Ohms (+/- 1.0 Ohms). -- Was Value obtained?	-- YES: GO TO: Step 6 -- NO: REPLACE: Reducing Agent Line Heater (Heating Circuit 2) -Z104- supply line. Refer to appropriate repair manual. GO TO: Step 8
6	DISCONNECT: Each heater resistor element of the Reducing Agent Line Heater (Heating Circuit 2) -Z104- individually for testing. JUMPER: Pins at one end of Reducing Agent Line Heater (Heating Circuit 2) -Z104- metering line from pump and check across terminals at other end of Reducing Agent Line Heater (Heating Circuit 2) -Z104- metering line from pump for resistance. SPECIFIED VALUE: 0.9 Ohms (+/- 1.0 Ohms). -- Was Value obtained?	-- YES: GO TO: Step 7 -- NO: REPLACE: Reducing Agent Line Heater (Heating Circuit 2) -Z104- metering line from pump. Refer to appropriate repair manual. GO TO: Step 8
7	DISCONNECT: Each heater resistor element of the Reducing Agent Line Heater (Heating Circuit 2) -Z104- individually for testing. JUMPER: Pins at one end of Reducing Agent Line Heater (Heating Circuit 2) -Z104- metering line to injector and check across terminals at other end of Reducing Agent Line Heater (Heating Circuit 2) -Z104- metering line to injector for resistance. SPECIFIED VALUE: 0.6 Ohms (+/-1.0 Ohms). -- Was Value obtained?	-- YES: REPLACE: Reducing Agent Line Heater (Heating Circuit 2) -Z104-. Refer to appropriate repair manual. GO TO: Step 8 -- NO: REPLACE: Reducing Agent Line Heater (Heating Circuit 2) -Z104- metering line to injector. Refer to appropriate repair manual. GO TO: Step 8
8	Final Procedure Perform a road test to verify repair. -- Does the original DTC return?	-- YES: CHECK: Reducing Agent Metering System Control Module -J880- harness connector for any damaged, pushed-out pins. REPAIR: As necessary. 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. If all electrical connections are OK: REPLACE: Reducing Agent Metering System Control Module -J880-. Refer to appropriate repair manual. 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.