1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back to ON (II).
3. Wait for at least 6 seconds.
4. Check for DTCs with the HDS.
Is DTC B1168, B1169, and/or B1178 indicated?
YES -
Go to step 5.
NO -
Intermittent failure, the system is OK at this time. Check for loose or poor connection between the gauge control module and the PCM.?
5. Check for Fuel and Emissions Systems DTCs with the HDS.
Are there any DTCs indicated?
YES -
Go to and troubleshoot the indicated DTCs, then recheck.?
NO -
Go to step 6.
6. Turn the ignition switch to LOCK (0).
7. Disconnect gauge control module connector A (12P).
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector A (49P).
10. Check for continuity between PCM connector A (49P) terminals No. 48 and No. 49 and gauge control module connector A (12P) connector
terminals No. 12 and No. 6 respectively.
Is there continuity?
YES -
Update the PCM if it does not have the latest software See: Powertrain Management/Computers and Control Systems/Engine Control
Module/Testing and Inspection/Programming and Relearning/PCM Update, or substitute a known-good PCM, and recheck. If the indication goes
away, replace the original PCM See: Powertrain Management/Computers and Control Systems/Engine Control Module/Service and Repair. If the
DTC is still present, replace the gauge control module See: Instrument Panel, Gauges and Warning Indicators/Instrument Cluster / Carrier/Service
