Suzuki GRAND VITARA JB416, Service Manual

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1A-38 Engine General Information and Diagnosis:
DTC P1678: CAN Communication (Reception Error for BCM)
S5JB0E1104066
Wiring Diagram
Refer to “DTC P1674: CAN Communication (Bus Off Error): ”.
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch and clear DTC by using scan tool.
3) Start engine and run it for 1 min. or more.
4) Check DTC.
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?
Go to Step 14. 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.
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?
Go to Step 15. Repair or replace
defective CAN
communication circuit.
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?
Check TCM power and
ground circuit. If circuit
is OK, substitute a
known-good TCM and
recheck. Substitute a known-
good ECM and recheck.
Step Action Yes No
DTC detecting condition Trouble area
Reception error of communication data for BCM is
detected for longer than specified time continuously.
(1 driving detection logic but MIL does not light up) • ECM
• BCM
• CAN communication line circuit