Suzuki GRAND VITARA Owner's Manual page 237

Step
11 DTC check in ECM
1) Disconnect connector from 4WD control module (for J20
engine) with ignition switch turned OFF.
2) Check ECM for DTC.
Is there DTC P1678?
12 ABS hydraulic unit / control module check
1) Measure resistance at following connector terminals.
• Between "E03-8" terminal and "E03-6" terminal of
ABS hydraulic unit / control module connector.
• Between "E03-10" terminal and "E03-12" terminal of
ABS hydraulic unit / control module connector.
Is measured resistance below 1
13 CAN communication line circuit continuity check
1) Disconnect connectors from all control modules
communicating by CAN with ignition switch turned OFF.
2) Measure resistance at following connector terminals.
• Between "E23-4" terminal of ECM connector and
"E03-10" terminal of ABS hydraulic unit / control
module connector
• Between "E23-19" terminal of ECM connector and
"E03-8" terminal of ABS hydraulic unit / control
module connector
• Between "E03-12" terminal of ABS hydraulic unit /
control module connector and "G31-1" terminal of
BCM connector
• Between "E03-6" terminal of ABS hydraulic unit /
control module connector and "G31-3" terminal of
BCM connector
• Between "G31-2" terminal of BCM connector and
"RED" wire terminal of DLC
• Between "G31-4" terminal of BCM connector and
"WHT" wire terminal of DLC
Is each resistance below 1
14 CAN communication line circuit insulation check
1) Measure resistance at following connector terminals.
• Between "E23-4" and "E23-19" terminal of ECM
connector
• Between "G31-1" and "G31-3" terminal of BCM
connector
• Between "G31-2" and "G31-4" terminal of BCM
connector
Is each resistance infinity?
Action
Ω
?
Ω
?
Engine General Information and Diagnosis:
Yes
Go to Step 12.
Go to Step 13.
Go to Step 14.
Go to Step 15.
1A-182
No
"E91-22" or "E91-23"
circuit wire between
4WD control module
and CAN circuit junction
connector is open or
high resistance. If wires
are OK, substitute a
known-good 4WD
control module and
recheck.
Substitute a known-
good ABS hydraulic unit
/ control module and
recheck.
Repair open or high
resistance of CAN
communication line
circuit referring to
"Precaution for CAN
Communication
System: in Section 00".
Repair insulation of
CAN communication
line circuit referring to
"Precaution for CAN
Communication
System: in Section 00".