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	CONNECT: Scan Tool. START or CRANK: Engine CHECK: Engine rpm SPECIFIED VALUE: Cranking or Idle rpm -- Was value obtained?	YES: Go to Step 3 NO: Go to Step 4
3	CONDITION: May be intermittent PERFORM: Visual Inspection of wiring and component 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 7
4	IGNITION: ON DISCONNECT: Engine Speed Sensor -G28- electrical connector CHECK: Engine Speed Sensor -G28- wiring connector terminals 1 to 2 for voltage SPECIFIED VALUE: About 5.0 V IGNITION: OFF -- Was value obtained?	YES: Go to Step 5 NO: Go to Step 6
5	REMOVE: Engine Control Module - J623-. Refer to appropriate service information. CHECK: Engine Speed Sensor -G28- electrical connector terminal 3 to the Engine Control Module - J623- electrical connector terminals T60 / 52. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω) -- Was value obtained?	YES: REMOVE: Engine Speed Sensor -G28-. Refer to appropriate repair information. CHECK: Engine Speed Sensor -G28- wheel for proper seating, damage and/or run - out. Refer to appropriate repair information. Sensor wheel OK REPLACE: Engine Speed Sensor -G28-. Refer to appropriate repair information. GO TO: Step 7 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 7
6	REMOVE: Engine Control Module - J623-. Refer to appropriate service information. CHECK: Engine Speed Sensor -G28- electrical connector terminals 1 to the Engine Control Module - J623- electrical connector terminals T60 / 59. CHECK: Engine Speed Sensor -G28- electrical connector terminals 2 to the Engine Control Module - J623- electrical connector terminals T60 / 51. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω) -- Was value obtained?	YES: REPLACE Engine Control Module -J623- Refer to appropriate repair information GO TO: Step 7 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 7
7	Final Procedure Perform a road test to verify repair. Do any DTC's return:	YES: Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY . Perform the diagnostic procedure for that DTC. NO: Repair is complete, Generate readiness code. Refer to READINESS CODE . Return vehicle to Customer