Suzuki GRAND VITARA Owner's Manual page 854

4E-28 ABS:
DTC Troubleshooting
Step
1 Was "ABS Check" performed?
2 1) Check connection of connectors of all control modules
communicating by means of CAN.
2) Recheck DTC.
Is DTC U1073 indicated?
3 1) Turn ignition switch to OFF position.
2) Disconnect connectors of all control modules
communicating by means of CAN.
3) Check CAN communication circuit between control
modules for open, short and high resistance.
Is each CAN communication circuit in good condition?
4 1) Turn ignition switch to OFF position.
2) Connect connectors to ABS hydraulic unit / control
module, BCM, TCM (for A/T model), 4WD control
module (if equipped), keyless start control module (if
equipped) and combination meter.
3) Recheck DTC for ABS.
Is DTC U1073 detected?
5 1) Turn ignition switch to OFF position.
2) Disconnect connectors from BCM.
3) Recheck DTC for ABS.
Is DTC U1073 detected?
6 NOTE
If vehicle equipped with M/T, go to Step 7.
1) Turn ignition switch to OFF position.
2) Disconnect connectors from TCM.
3) Recheck DTC for ABS.
Is DTC U1073 detected?
7 NOTE
If vehicle is not selectable 4WD (motor shift
type), go to Step 8.
1) Turn ignition switch to OFF position.
2) Disconnect connectors from 4WD control module.
3) Recheck DTC for ABS.
Is DTC U1073 detected?
8 NOTE
If vehicle is not equipped keyless start system,
go to Step 9.
1) Turn ignition switch to OFF position.
2) Disconnect connectors from keyless start control
module.
3) Recheck DTC for ABS.
Is DTC U1073 detected?
Action Yes
Go to Step 2.
Go to Step 3.
Go to Step 4.
Go to Step 5.
Go to Step 6.
Go to Step 7.
Go to Step 8.
Go to Step 9.
No
Go to "ABS Check: ".
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection: in Section
00".
Repair insulation of
CAN communication
line circuit referring to
"Precaution for CAN
Communication
System: in Section 00".
Check ECM power and
ground circuit. If circuit
is OK, substitute a
known-good ECM and
recheck.
Check BCM power and
ground circuit. If circuit
is OK, substitute a
known-good BCM and
recheck.
Check TCM power and
ground circuit. If circuit
is OK, substitute a
known-good TCM and
recheck.
Check 4WD control
module power and
ground circuit. If circuit
is OK, substitute a
known-good 4WD
control module and
recheck.
Check keyless start
control module power
and ground circuit. If
circuit is OK, substitute
a known-good keyless
start control module and
recheck.