Montero XLS 4WD V6-3.5L SOHC (2001)
Simplified Wiring System: Testing and Inspection
Description of On-Board Diagnostics
The SWS reduces the number of wires by sending multiple signals along a single wire. This reduces vehicle weight and simplifies construction by
reducing wiring harness complexity weight. The ETACS-ECU, front-ECU, column switch (incorporated in column-ECU) and sunroof motor assembly
(incorporated in sunroof-ECU) have multiplex signal circuits that enable them to transmit and/or receive multiple signals and communicate with other
control unit.
Diagnostic Strategies
Use these steps to plan your diagnostic strategy. If you follow them carefully, you will be sure that you have exhausted most of the possible ways to find
a SWS fault.
1. Gather information about the problem from the customer.
2. Verify that the condition described by the customer exists.
3. Check the vehicle for any SWS DTC.
4. If you cannot verify the condition and there are no SWS DTCs, the malfunction is intermittent. Refer to How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunctions.
5. If you can verify the condition but there are no SWS DTCs, or the system cannot communicate with the scan tool, refer to Symptom Chart.
6. If there is a SWS DTC, perform the diagnostic procedures for the DTC. Refer to Diagnostic Trouble Chart.
Reading and Clearing Diagnostic Trouble Codes
Retrieving SWS Diagnostic Trouble Codes
Required Special Tool:
MB991502: Scan Tool (MUT-II)
CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or
disconnecting scan tool MB991502.
1. Connect scan tool MB991502 to the data link connector.
2. Use scan tool MB991502 to check for SWS diagnostic trouble codes.
3. Turn the ignition switch to the "LOCK" (OFF) position.
4. Disconnect scan tool MB991502.
Diagnostic Trouble Code Descriptions
For information regarding B, C, P, U and Manufacturer Code Descriptions - See: Testing and Inspection/Diagnostic Trouble Code Descriptions
Diagnostic Trouble Code Tests and Associated Procedures
For information regarding diagnosis of all B, C, P, U and Manufacturer Codes - See: Testing and Inspection/Diagnostic Trouble Code Tests and
Associated Procedures
Input Signal Check
