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	DISCONNECT: Reducing Agent Heater Control Module -J891- electrical connector IGNITION: ON CHECK: Reducing Agent Heater Control Module -J891- wiring connector terminals T5 / 3 and 5 to ground for voltage SPECIFIED VALUE: Battery voltage IGNITION: OFF -- Was value obtained?	-- YES: GO TO: Step 3 -- NO: CHECK: wiring for open, high resistance, short or electrical connector for damage, corrosion, loose or broken terminals REPAIR: faulty wiring or connector GO TO: Step 4
3	REMOVE: Reducing Agent Heater Control Module -J891-. Refer to appropriate service information. CHECK: Reducing Agent Heater Control Module -J891- electrical connector terminals T4 / 3 to the Engine Control Module -J623- electrical connector terminals T94 / 40. CHECK: Reducing Agent Heater Control Module -J891- electrical connector terminals T4 / 4 to the Engine Control Module -J623- electrical connector terminals T94 / 9. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω) -- Was value obtained?	-- YES: REPLACE: Reducing Agent Heater Control Module -J891-. Refer to proper repair information for removal and replace procedures. GO TO: Step 4 -- NO: CHECK: wiring for open, high resistance, short or electrical 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. Do any DTC's return:	-- YES: Perform the diagnostic procedure for that DTC. -- NO: Repair is complete, Generate readiness code. Refer to READINESS CODE . Return vehicle to Customer