Suzuki GRAND VITARA JB416, Service Manual

Page: 166 / 474

3C-49 Transfer: Motor-Shift Type (Transfer with Shift Actuator)
Troubleshooting
Step Action Yes No
1 Was “4WD control system check” performed? Go to Step 2. Go to “4WD Control
System Check: Motor-
Shift Type (Transfer with
Shift Actuator)”.
2 Control module connector check
1) Check connection of connectors of all control modules
communicating by means of CAN.
2) Recheck DTC in TCM.
Is DTC U1073 detected?
Go to Step 3. Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection: in Section
00 in related manual”.
3 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?
Go to Step 4. Repair circuit.
4 Check DTC
1) Turn ignition switch to OFF position.
2) Disconnect each connector.
• ECM
• ABS or ESP
®
hydraulic unit / control module
• BCM
• TCM (if equipped)
• Keyless start control module (if equipped)
3) Recheck DTC in 4WD control module.
Is DTC U1073 detected?
Check 4WD control
module power and
ground circuit. If circuits
are OK, substitute a
known-good 4WD
control module and
recheck. Check applicable
control module power
and ground circuit. If
circuit is OK, substitute
a known-good
applicable control
module and recheck.