Suzuki GRAND VITARA Owner's Manual page 241

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 P1685?
12 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
Is each resistance below 1
13 CAN communication line circuit insulation check
1) Measure resistance between "E23-4" and "E23-19"
terminals of ECM connector.
Is resistance infinity?
14 CAN communication line circuit ground short check
1) Measure resistance at following connector terminals.
• Between "E23-4" terminal of ECM connector and
vehicle body ground
• Between "E23-19" terminal of ECM connector and
vehicle body ground
Is each resistance infinity?
15 Check for short circuit of CAN communication line to
power circuit
1) Measure voltage at following connector terminals with
ignition switch turned ON.
• Between "E23-4" terminal of ECM connector and
vehicle body ground
• Between "E23-19" terminal of ECM connector and
vehicle body ground
Is each voltage 0 – 1 V?
16 ECM circuit check
1) Connect connector to ABS hydraulic unit / control
module with ignition switch turned OFF.
2) Measure resistance at following connector terminals.
• Between "E03-8" and "E03-6" terminals of ABS
hydraulic unit / control module connector
• Between "E03-10" and "E03-12" terminals of ABS
hydraulic unit / control module connector
Is resistance below 1
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.
Go to Step 16.
Go to Step 17.
1A-186
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.
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".
Repair short to ground
of CAN communication
line circuit referring to
"Precaution for CAN
Communication
System: in Section 00".
Repair short to power
supply of CAN
communication line
circuit referring to
"Precaution for CAN
Communication
System: in Section 00".
Substitute a known-
good ABS hydraulic unit
/ control module
assembly and recheck.