DTC Troubleshooting: 86-24, 86-25

DTC 86-24:  F-CAN Communication with Engine 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.Test-drive the vehicle. Drive the vehicle at 10 km/h (7 mph) or more.

5.Check for DTCs with the HDS.

Is 86-24, and/or 86-25 DTC indicated?

YES - Go to 6.

NO - Intermittent failure, the system is OK at this time. Check for loose terminals between the ECM/PCM connector A (44P), the gauge control module (tach) connector (36P) and the ABS modulator-control unit 25P connector. Refer to intermittent failures troubleshooting.n

6.Turn the ignition switch OFF.

7.Short the SCS line with the HDS.

8.Disconnect ECM/PCM connector A (44P).

9.Disconnect the ABS modulator-control unit 25P connector.

10.Check for continuity between ABS modulator-control unit 25P connector terminal and ECM/PCM connector A (44P) terminal (see table).

Sign Connector Terminal No. 
ABS Modulator-control Unit ECM/PCM 
CAN-L 17 37 
CAN-H 36 


Is there continuity?

YES - Check for loose terminals in the ECM/PCM connector A (44P) and at the ABS modulator-control unit 25P connector. If necessary, substitute a known-good ECM/PCM, then go to step 1 and recheck. If no DTCs are indicated, replace the original ECM/PCM: R18A1 engine model, K20Z2 engine model. If DTCs are indicated, replace the ABS modulator-control unit: Except K20Z2 engine model, K20Z2 engine model.n

NO - Repair open in the wire between the ECM/PCM and the ABS modulator-control unit.n