Diagnostic Item 7

DIAGNOSTIC ITEM 7: Diagnose When The Scan Tool Cannot Receive The Data Sent By Steering Wheel Sensor.

CAUTION: When servicing a CAN bus line, ground yourself by touching a metal object such as an unpainted water pipe. If you fail to do so, a component connected to the CAN bus line may be damaged.

CAN-C Communication Circuit [M/T]:

CAN-C Communication Circuit [TC-SST] (Part 1):

CAN-C Communication Circuit [TC-SST] (Part 2):

FUNCTION
If the scan tool MB991958 cannot communicate with the steering wheel sensor, this diagnosis result will be set.

TROUBLE JUDGMENT CONDITIONS
If a communication flag is not set for the steering wheel sensor, the ETACS-ECU determines that there is a failure.

TROUBLESHOOTING HINTS
- Malfunction of the connector [joint connector (CAN2) or steering wheel sensor connector improperly connected]
- Malfunction of the wiring harness [open circuit between the steering wheel sensor and the joint connector (CAN2), power supply circuit to the steering wheel sensor]
- Malfunction of the steering wheel sensor

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe

STEP 1. Check joint connector (CAN2) C-104 and steering wheel sensor connector C-209 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

CAUTION: The strand end of the twisted wire should be within 10 cm (4 inches) from the connector.

Q: Are joint connector (CAN2) C-104 and steering wheel sensor connector C-209 in good condition?

YES : Go to Step 2.

NO : Repair the damaged parts.

STEP 2. Check the wiring harness between joint connector (CAN2) C-104 and steering wheel sensor connector C-209 for open circuit.

CAUTION: Strictly observe the specified wiring harness repair procedure.

1. Disconnect joint connector (CAN2) C-104 and steering wheel sensor connector C-209, and check the wiring harness.







2. Check the wiring harness between joint connector (CAN2) C-104 (terminal 7) and steering wheel sensor connector C-209 (terminal 3)

OK: Continuity exists (2 ohms or less)







3. Check the wiring harness between joint connector (CAN2) C-104 (terminal 20) and steering wheel sensor connector C-209 (terminal 4)

OK: Continuity exists (2 ohms or less)

Q: Is the wiring harness between joint connector (CAN2) C-104 and steering wheel sensor connector C-209 in good condition?

YES : Check the power supply circuit of the steering wheel sensor. Refer to Troubleshooting. C121A

NO : Repair the wiring harness between joint connector (CAN2) C-104 and steering wheel sensor connector C-209.