Inspection Of 4Wd Control Module And Its Circuits - Suzuki GRAND VITARA Owner's Manual

DTC Detecting Condition and Trouble Area
DTC detecting condition
Reception error of communication data for ABS hydraulic unit /
control module is detected for longer than specified time
continuously.
DTC Confirmation Procedure
1) Clear DTC using scan tool.
2) Start engine and run it for 1 min. or more.
3) Stop vehicle and check DTC.
Troubleshooting
Step
1 Was "4WD control system check" performed?
2 DTC check
1) Check DTC in 4WD control module.
Is DTC U1100 and DTC U1073 detected together?
3 DTC check
1) Check DTC in ABS hydraulic unit / control module.
Is DTC PU1073 detected?
4 Check each control module connectors
1) Check connection of connectors of all control modules
communicating by means of CAN.
2) Recheck in 4WD control module.
Is DTC U1100 detected?
5 CAN communication circuit check
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?

Inspection of 4WD Control Module and Its Circuits

4WD control module and its circuits can be checked at coupler connected to 4WD control module by measuring
voltage, pulse signal.
CAUTION
!
4WD control module cannot be checked by itself. It is strictly prohibited to connect voltmeter or
ohmmeter to 4WD control module with couplers disconnected from it.
Transfer: Motor-Shift Type (Transfer with Shift Actuator) 3C-51
Action
Trouble area
• CAN communication circuit
• ABS hydraulic unit / control module
• 4WD control module
Yes
Go to Step 2.
Go to "DTC U1073:
Control Module
Communication Buss
Off: Motor-Shift Type
(Transfer with Shift
Actuator)".
Go to "DTC U1073:
Control Module
Communication Bus
Off: in Section 4E".
Go to Step 5.
Check ABS hydraulic
unit / control module
power and ground
circuit. If circuit is OK,
substitute a known-
good ABS hydraulic unit
/ control module and
recheck.
No
Go to "4WD Control
System Check: Motor-
Shift Type (Transfer with
Shift Actuator)".
Go to Step 3.
Go to Step 4.
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection: in Section
00".
Repair circuit.
S5JB0A3314037