Diagnosis System
- DESCRIPTION
Description The ECM controls the function of cruise control and dynamic laser cruise control on a vehicle. Data on the cruise control system, dynamic laser cruise control system and the DTCs can be read from DLC3 on the vehicle. If the CRUISE main indicator does not come on after the DTC check, there is a malfunction on the cruise control and dynamic laser cruise control system. Use the intelligent tester or SST check wire to check and solve the problem.
SST 09843-18040
- CHECK DLC3 DLC3
Terminal No. Condition/Specified Condition Condition 4 Chassis Ground <--> Body Ground/1 or less Always 7 Bus + Line/Pulse Generation During Communication 10 Battery Positive <--> Body Ground/9 to 14 V Always The vehicle's ECM uses ISO 9141-2 for communication. The terminal arrangement of DLC3 complies with SAE J1962 and matches the ISO 9141-2 format.
HINT:
If the display shows "UNABLE TO CONNECT TO VEHICLE" when the intelligent tester is connected to the DLC3 and the ignition switch is ON, there is a problem on either the vehicle or the tool.
- If communication is normal when the tool is connected to another vehicle, check DLC3 on the original vehicle.
- If communication is still not possible when the tool is connected to another vehicle, the problem is probably in the tool itself. Consult with the Service Department listed in the tool's instruction information.
- CHECK INDICATOR
- Turn the ignition switch ON.
- Check that the CRUISE main indicator light and READY indicator light comes on when the cruise control main switch is turned on. Then, the indicator light goes off when the main switch is turned off.
HINT:
If the indicator check result shows problem, proceed to troubleshooting (See HOW TO PROCEED WITH TROUBLESHOOTING ) for the combination meter.
- Check the DTCs.
HINT:
If a malfunction occurs in the vehicle speed sensors or the stop light switch, etc. during cruise control driving, the ECU actuates AUTO CANCEL of the cruise control and blinks CRUISE main indicator light. This indicator light inform malfunction to the driver. At the same time, the malfunction date is stored as a diagnostic trouble code.