CAN-BUS TERMINAL RESISTANCE, Transmission Control Module - J217- TO Engine Control Module - J623-, CHECKING

Function

The Engine Control Module -J623- communicates with other CAN-Bus capable control modules.

The control modules are connected by two data bus wires which are twisted together (CAN_High and CAN_Low), and exchange information (messages). Missing information on the CAN-bus is recognized as a malfunction by the Engine Control Module -J623- and the other control modules connected to the CAN-bus.

Trouble-free operation of the CAN-Bus requires that it have a terminal resistance. This central terminal resistance is located in the Engine Control Module -J623-.

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: .
View clean working conditions: .

Test Procedure

Step	Procedure	Result / Action to Take
1	PERFORM: Preliminary Check to verify the customers complaint. Refer to . -- Was Complaint verified?	-- YES: GO TO Step 2 CAN-BUS TERMINAL RESISTANCE, Transmission Control Module - J217- TO Engine Control Module - J623-, CHECKING => 2 . -- NO: GATHER more information from customer about the complaint.
2	DISCONNECT: Transmission Control Module -J217- harness connector. The Engine Control Module -J623- must remain connected for the following step. CHECK: Transmission Control Module -J217- harness connector terminals 5 to 2 (for OAW) or terminals 6 to 5 (for OBK/OBW) for resistance. Refer to appropriate System Wiring Diagram. Specified value: 60 to 72 Ω (at Approx. 20° C). -- Was Value obtained?	-- YES: CONDITION: May be intermittent. 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 CAN-BUS TERMINAL RESISTANCE, Transmission Control Module - J217- TO Engine Control Module - J623-, CHECKING => 4 . -- NO: GO TO Step 3 CAN-BUS TERMINAL RESISTANCE, Transmission Control Module - J217- TO Engine Control Module - J623-, CHECKING => 3 .
3	REMOVE: Engine Control Module - J623-. Refer to appropriate repair Service Information. CHECK: Faulty Transmission Control Module -J217- harness connector terminal 5 (for OAW) or terminal 6 (for OBK/OBW) to the Engine Control Module - J623- harness connector T94 / 67 for resistance. Refer to appropriate System Wiring Diagram. CHECK: Faulty Transmission Control Module -J217- harness connector terminal 2 (for OAW) or terminal 5 (for OBK/OBW) to the Engine Control Module - J623- harness connector T94 / 68 for resistance. Refer to appropriate System Wiring Diagram. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Were Values obtained?	-- YES: REPLACE Engine Control Module -J623-. Refer to appropriate repair Service Information. GO TO Step 4 CAN-BUS TERMINAL RESISTANCE, Transmission Control Module - J217- TO Engine Control Module - J623-, CHECKING => 4 . -- NO: CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals. If no malfunction is found in the wiring: REPLACE Transmission Control Module -J217-. Refer to appropriate repair Service Information. GO TO Step 4 CAN-BUS TERMINAL RESISTANCE, Transmission Control Module - J217- TO Engine Control Module - J623-, CHECKING => 4 .
4	Final Procedure Perform a road test to verify repair. Do any DTCs return:	-- YES: Check the DTC memory. Refer to . Perform the diagnostic procedure for that DTC. -- NO: Repair is complete. Generate readiness code. Refer to . Return vehicle to Customer.