Test Procedure

Step	Procedure	Result / Action to Take
1	PERFORM: Preliminary Check to verify the customers complaint. Refer to: 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. CONNECT: Scan Tool. START or CRANK: Engine. CHECK: Engine rpm. SPECIFIED VALUE: Cranking or Idle rpm. IGNITION: OFF. -- Was Value obtained?	-- YES: CONDITION: May be intermittent. PERFORM: Visual Inspection of wiring and component. CHECK: Harness for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals. REPAIR: Faulty wiring or connector. GO TO: Step 4. --NO: GO TO: Step 3.
3	DISCONNECT: Engine Speed Sensor -G28- harness connector. REMOVE: Engine/Motor Control Module - J623-. CHECK: Engine Speed Sensor -G28- harness connector terminal 1 to the Engine/Motor Control Module - J623- harness connector T105 / 59 for resistance. CHECK: Engine Speed Sensor -G28- harness connector terminal 2 to the Engine/Motor Control Module - J623- harness connector T105 / 58 for resistance. CHECK: Engine Speed Sensor -G28- harness connector terminal 3 to the Engine/Motor Control Module - J623- harness connector T105 / 57 for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Were Values obtained?	--YES: REMOVE: Engine Speed Sensor -G28-. CHECK: Engine Speed Sensor -G28- sensor wheel for proper seating, damage and/or run - out. Sensor wheel OK. REPLACE: Engine Speed Sensor -G28-. 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/Motor Control Module -J623- harness connector for any damaged, pushed out pins. REPAIR: As necessary. If all electrical connections are OK: REPLACE: Engine/Motor Control Module -J623-. 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.