DTC Troubleshooting: 86-31

DTC 86-31:  F-CAN Communication with Gauge Control Module Malfunction

1.Turn the ignition switch ON (II).

2.Clear the DTC with the HDS.

3.Turn the ignition switch OFF, then turn it ON (II) again.

4.Check for DTCs with the HDS.

Is 86-31 DTC indicated?

YES - If the DTC 86-01 is indicated at the same time, do the DTC 86-01 troubleshooting. If 86-01 is not indicated, go to 5.

NO - If any DTCs are indicated, go to the indicated DTCs troubleshooting. If DTCs are not indicated, intermittent failure, the system is OK at this time. Check for loose terminals between the yaw rate-lateral acceleration sensor 5P connector, the PCM connector A (44P), the gauge control module (tach) connector (36P), and the VSA modulator-control unit 37P connector. Refer to intermittent failures troubleshooting.n

5.Turn the ignition switch ON (II).

Do the gauge indicators come on?

YES - Go to 6.

NO - Do the gauge control module troubleshooting.n

6.Turn the ignition switch OFF.

7.Disconnect the gauge control module (tach) connector (36P).

8.Disconnect the VSA modulator-control unit 37P connector.

9.Check for continuity between the VSA modulator-control unit 37P connector terminal and gauge control module (tach) connector (36P) terminal (see table).

Sign Connector Terminal No. 
VSA Modulator-control Unit Gauge Control Module 
CAN-L 19 
CAN-H 15 


Is there continuity?

YES - Check for loose terminals in the gauge control module (tach) connector (36P). If necessary, substitute a known-good gauge control module (tach), then go to 1 and recheck. If no DTCs are indicated, replace the original gauge control module (tach). If DTC 86-31 resets, replace the VSA modulator-control unit.n

NO - Repair open in the wire between the gauge control module (tach) and the VSA modulator-control unit.n