Inspection Procedure A-1

Communication with the SWS Monitor Kit is Impossible.

NOTE: This troubleshooting requires use of scan tool MB991502 and SWS monitor kit MB991862. For details of how to use the SWS monitor, refer to "How to use SWS monitor."

Scan Tool Communication And ETACS-ECU Ground Circuit:

Connectors:

TECHNICAL DESCRIPTION (COMMENT)
The SWS monitor kit may be connected improperly.

TROUBLESHOOTING HINTS
- Malfunction of the SWS monitor body (I/F cartridge)
- Malfunction of the SWS monitor harness-Malfunction of the ETACS-ECU
- Damaged harness wires or connectors

DIAGNOSIS

Required Special Tools:
- MB991223: Test Harness Set
- MB991502: Scan Tool (MUT-II)
- MB991862: SWS Monitor Kit

STEP 1. Check SWS monitor kit MB991B62 for proper connection.

Q: Is SWS monitor kit MB991862 connected with the column switch properly?

YES: Go to Step 2.

NO: Connect SWS monitor kit MB991862 to the column switch securely.

STEP 2. Check the power supply circuit to the ETACS-ECU.

Q: Does the system communicate with scan tool MB991502 when the ignition switch is turned to the "ON" position?

YES: Go to Step 3.

NO: Refer to Inspection Procedure A-3 "Communication with the ETACS-ECU is impossible."

STEP 3. Measure at ETACS-ECU connector C-119 in order to check the ground circuit to the ETACS-ECU.
1. Disconnect ETACS-ECU connector C-119, and measure at the junction block side.




2. Measure the resistance value between terminal 3 and ground.
- The measured value should be 2 ohm or less.

Q: Does the measured resistance value correspond with this range?

YES: Go to Step 6.

NO: Go to Step 4.




STEP 4. Check ETACS-ECU connector C-119 for damage.

Q: Is ETACS-ECU connector C-119 in good condition?

YES: Go to Step 5.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. The system should communicate with the SWS monitor normally.







STEP 5. Check the wiring harness between ETACS-ECU connector C-119 and the ground.

NOTE: Also check junction block connector C-108. If junction block connector C-108 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between ETACS-ECU connector C-119 and the ground in good condition?

YES: No action to be taken.

NO: Repair the wiring harness. The system should communicate with the SWS monitor kit normally.







STEP 6. Check ETACS-ECU connector C-118 and data link connector C-29 for damage.

Q: Are ETACS-ECU connector C-118 and data link connector C-29 in good condition?

YES: Go to Step 7.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. The system should communicate with the SWS monitor kit normally.










STEP 7. Check the wiring harness between ETACS-ECU connector C-118 and data link connector C-29.

NOTE: Also check joint connector C-77. If joint connector C-77 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between ETACS-ECU connector C-118 and data link connector C-29 in good condition?

YES: Replace the ETACS-ECU. The system should communicate with the SWS monitor kit normally.

NO: Repair the wiring harness. The system should communicate with the SWS monitor kit normally.