Honda Civic. Manual — part 1095

Fig. 46: Checking Continuity Between VSA Modulator-Control Unit 37P
Connector Terminals No. 1 And No. 15 And Body Ground

Is there continuity?

YES -Repair short to body ground in the wire between the ECM/PCM, the
gauge control module (tach), the data link connector (DLC), the SRS unit, the
EPS control unit (if equipped), the TPMS control unit (if equipped), and the
yaw rate-lateral acceleration sensor, and the VSA modulator-control unit.

NO -Go to step 16.

16. Check for continuity between VSA modulator-control unit 37P connector

terminals No. 1 and No. 15.

Fig. 47: Checking Continuity Between VSA Modulator-Control Unit 37P
Connector Terminals No. 1 And No. 15

Is there continuity?

YES -Repair short in the wire between VSA modulator-control unit 37P

2008 Honda Civic GX

2006-08 BRAKES VSA System - Civic (All Except Hybrid)

connector terminals No. 1 (CAN-L line) and No. 15 (CAN-H line).

NO -Go to step 17.

17. Check for continuity between the VSA modulator-control unit 37P connector

terminal and ECM connector A (44P) terminal (see table).

CONNECTOR TERMINAL DESCRIPTION

Fig. 48: Checking Continuity Between VSA Modulator-Control Unit 37P
Connector Terminal And ECM Connector A (44P) Terminal

Is there continuity?

YES -Check for loose terminals in the VSA modulator-control unit 37P
connector. If necessary, substitute a known-good VSA modulator-control unit
(see VSA MODULATOR-CONTROL UNIT REMOVAL AND
INSTALLATION ), and retest.

NO -Repair open in the wire between the ECM and the VSA modulator-

Sign

Connector Terminal No.

VSA Modulator-control Unit ECM

CAN-L

1

37

CAN-H

15

36

2008 Honda Civic GX

2006-08 BRAKES VSA System - Civic (All Except Hybrid)

control unit.

DTC 86-11: F-CAN COMMUNICATION WITH ECM MALFUNCTION; DTC 86-21: F-CAN
COMMUNICATION WITH ENGINE MALFUNCTION; DTC 86-22: F-CAN COMMUNICATION
WITH ENGINE MALFUNCTION; DTC 86-23: F-CAN COMMUNICATION WITH ENGINE
MALFUNCTION; DTC 86-24: F-CAN COMMUNICATION WITH ENGINE MALFUNCTION; DTC
86-25: F-CAN COMMUNICATION WITH ENGINE MALFUNCTION; DTC 86-41: F-CAN
COMMUNICATION WITH EAT MALFUNCTION

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Test-drive the vehicle. Drive the vehicle at 7 mph (10 km/h) or more.
5. Check for DTCs with the HDS.

Is 86-11, 86-21, 86-22, 86-23, 86-24, 86-25, and/or 86-41 DTC indicated?

YES -If the DTC 86-01 is indicated at the same time, do the DTC 86-01
troubleshooting (see DTC 86-01: F-CAN Bus-off Malfunction ). If 86-01 is
not indicated, go to step 6.

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 ECM connector A (44P) and the VSA
modulator-control unit 37P connector. Refer to INTERMITTENT
FAILURES TROUBLESHOOTING (see ).

6. Turn the ignition switch to LOCK (0).
7. Short the SCS line with the HDS.
8. Disconnect ECM connector A (44P).
9. Disconnect the VSA modulator-control unit 37P connector.

10. Check for continuity between the VSA modulator-control unit 37P connector

terminal and ECM connector A (44P) terminal (see table).

CONNECTOR TERMINAL DESCRIPTION

Sign

Connector Terminal No.

2008 Honda Civic GX

2006-08 BRAKES VSA System - Civic (All Except Hybrid)

Fig. 49: Checking Continuity Between VSA Modulator-Control Unit 37P
Connector Terminal And ECM Connector A (44P) Terminal

Is there continuity?

YES -Check for loose terminals in ECM connector A (44P) and at the VSA
modulator-control unit 37P connector. If necessary, substitute a known-good
ECM, then go to step 1 and recheck. If no DTCs are indicated, replace the
original ECM (see ECM REPLACEMENT ). If DTCs are indicated, replace
the VSA modulator-control unit (see VSA MODULATOR-CONTROL
UNIT REMOVAL AND INSTALLATION ).

NO -Repair open in the wire between the ECM and the VSA modulator-
control unit.

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 to LOCK (0), then turn it ON (II) again.

VSA Modulator-control Unit ECM

CAN-L

1

37

CAN-H

15

36

2008 Honda Civic GX

2006-08 BRAKES VSA System - Civic (All Except Hybrid)