Suzuki Grand Vitara 2011 Manual page 254

1A-185 Engine General Information and Diagnosis: For Petrol Engine Model
Step
12 DTC check
1) Disconnect connector from 4WD control module (if
equipped) with ignition switch turned OFF.
2) Check ECM for DTC.
Is there DTC P1676?
13 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 P1676?
14 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 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?
15 DTC check in BCM
1) Connect connectors to all control modules
communicating by CAN with ignition switch turned OFF.
2) Check DTC U1101 in BCM.
Is it indicated?
Action Yes
Go to Step 13.
Go to Step 14.
Go to Step 15.
Check TCM power and
ground circuit. If circuit
is OK, substitute a
known-good TCM and
recheck.
No
CAN communication
circuit wire between
4WD control module
and CAN circuit
injection 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.
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.
Repair or replace
defective CAN
communication circuit.
Substitute a known-
good ECM and recheck.