DTC B1178: F-CAN Communication Line Error; DTC B1168: Gauge Control Module Lost Communication with ECM/PCM (Engine Messages); DTC B1169: Gauge Control Module Lost Communication with PCM (A/T Messages)
NOTE:
If you are troubleshooting multiple DTC's, be sure to follow the instructions in B-CAN system diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A
).
- Clear the DTCs using the HDS.
- Turn the ignition switch OFF then back to the ON (II).
- Start and run the engine for at least 5 seconds then turn the engine off.
- Check for DTCs using the HDS.
Is DTC B1178, B1168, and/or B1169 indicated ?
YES -Go to step 5.
NO -Intermittent failure, the F-CAN communication line is OK at this time. Check for loose or poor connections. If the connections are good, check the battery condition (see BATTERY TEST ) and the charging system (see CHARGING SYSTEM INDICATOR CIRCUIT TROUBLESHOOTING ).
- Check for DTCs in the ECM/PCM.
Are any DTCs indicated?
YES -Troubleshoot the ECM/PCM DTCs.
NO -Go to step 6.
- Perform the Gauge Control Module Input Test (see GAUGE CONTROL MODULE INPUT TEST
).
Are ail inputs OK?
YES -Go to step 7.
NO -Repair the faulty input then recheck for DTCs.
- Substitute a know-good gauge control module.
- Clear the DTCs using the HDS.
- Turn the ignition switch OFF then back to the ON (II).
- Start and run the engine for at least 5 seconds then turn the engine off.
- Check for DTCs using the HDS.
Is DTC B1178, B1168, and/or B1169 indicated?
YES -Replace the ECM/PCM.
NO -The original gauge control module is faulty; replace the gauge control module (see GAUGE CONTROL MODULE REPLACEMENT ).