Suzuki GRAND VITARA JB416, Service Manual

Page: 63 / 474

Engine General Information and Diagnosis: 1A-45
13 DTC check in ECM
1) Disconnect connector from 4WD control module (if
equipped) with ignition switch turned OFF.
2) Check ECM for DTC.
Is there DTC P1685?
Go to Step 12. CAN communication
circuit wire between
4WD control module
and CAN circuit junction
connector is open or
high resistance. If wires
are OK, check 4WD
control module power
and ground circuits. If
circuits are OK,
substitute a known-
good 4WD control
module and recheck.
14 DTC check
1) Disconnect connector from steering angle sensor
(vehicle with ESP
®
) with ignition switch turned OFF.
2) Check ECM for DTC.
Is there DTC P1685?
Go to Step 15. CAN communication
circuit wire between
steering angle sensor
and CAN circuit junction
connector is open or
high resistance. If wires
are OK, check steering
angle sensor power and
ground circuits. If
circuits are OK,
substitute a known-
good steering angle
sensor and recheck.
15 CAN communication circuit check
1) Disconnect connectors from all control modules (ECM,
TCM (if equipped), BCM, ABS or ESP
®
control module,
4WD control module (if equipped), keyless start control
module (if equipped), combination meter, steering to
angle sensor (vehicle with ESP
®
) with ignition switch
turned OFF.
2) Check that CAN communication circuit is as follows.
• All wire harness resistance of CAN communication
circuit is less than 1
Ω
between each control module.
• Insulation resistance between CAN communication
circuit wires is infinity at each control module
connector.
• Insulation resistance between each CAN
communication circuit wire and vehicle body ground is
infinity at each control module connector.
• Circuit voltage of CAN communication circuit is 0 V
with ignition switch turned ON.
Are they in good condition?
Go to Step 16. Repair or replace
defective CAN
communication circuit.
16 ABS warning lamp check
1) Connect connectors to all control modules
communicating by CAN.
2) Turn ignition switch ON.
Is ABS warning lamp light up?
Substitute a known-
good ABS or ESP
®
control module and
recheck.
Substitute a known-
good ECM and recheck.
Step Action Yes No