Suzuki Grand Vitara JB416 / JB420 (ESP model). Service manual - part 10

1A-36 Engine General Information and Diagnosis:

DTC P1676: CAN Communication (Reception Error for TCM (for A/T model))

S5JB0E1104065

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.

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 (if equipped)) 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

1) Connect connectors to ECM with ignition switch turned

OFF.

2) Check ECM for DTC.

Is there DTC P1674?

Substitute a known-
good ECM and recheck.

Check ABS or ESP

control module power
and ground circuits. If
circuits are OK,
substitute a known-
good ABS or ESP

® and

recheck.

Step

Action

Yes

DTC detecting condition

Trouble area

Reception error of communication data for TCM is
detected for longer than specified time continuously.
(1 driving detection logic)

• ECM
• TCM (for A/T model)
• CAN communication line circuit

Engine General Information and Diagnosis: 1A-37

DTC Troubleshooting

NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to
“Precautions For DTC Troubleshooting in related manual”.

Step

Action

Yes

Was “Engine and Emission Control System Check”
performed?

Go to Step 2.

Go to “Engine and
Emission Control
System Check in related
manual”.

DTC check
1) Connect scan tool to DLC with ignition switch turned

OFF.

2) Check ECM, TCM (for A/T model), ABS / ESP

® control

module, 4WD control module (if equipped), keyless start
control module (if equipped) and BCM for DTC.

Is there any DTC(s) other than CAN communication DTC(s)
at each control module (other than DTC P1618, P1674,
P1676, P1678, P1685 in ECM, DTC P1774, P1777, P1778
in TCM (for A/T model), DTC U1073, U1100, U1101, U1121,
U1126, U1139, U1140, U1144 in BCM, ABS / ESP

control

module and 4WD control module (if equipped), and DTC
No.31 / 33 in keyless start control module (if equipped))?

Go to applicable DTC
diag. flow.

Go to Step 3.

Check CAN communication error for ECM
1) Check ECM for DTC.

Is there DTC P1674?

Go to “DTC P1674:
CAN Communication
(Bus Off Error)”.

Go to Step 4.

ECM, ABS / ESP

® control module and TCM (for A/T

model) connector check
1) Check for proper connection at each ECM, ABS / ESP

control module and TCM (for A/T model) connector
terminals with ignition switch turned OFF.

2) If connections are OK, recheck ECM for DTC with

engine running.

Is there DTC P1676?

Go to Step 5.

Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section 00
in related manual”.

ECM power and ground circuit check
1) Check ECM power and ground circuits referring to “ECM

Power and Ground Circuit Check in related manual”.

Are they in good condition?

Go to Step 6.

Repair ECM power and/
or ground circuits.

DTC check in TCM (for A/T model)
1) Check DTC P1774 in TCM (for A/T model).

Is it indicated?

Go to “DTC P1774:
CAN Communication
Bus Off in Section 5A”.

Go to Step 7.

CAN communication circuit check
1) Disconnect connectors from TCM and ECM with ignition

switch turned OFF.

2) Check that CAN communication circuit is as follows.

• Circuit resistance of CAN communication circuit is

less than 1

Ω between “WHT/RED” terminal of ECM

connector and “RED” terminal of TCM connector.

• Circuit resistance of CAN communication circuit is

less than 1

Ω between “WHT/BLU” terminal of ECM

connector and “WHT” terminal of TCM connector.

Is it in good condition?

Go to Step 9.

Go to Step 8.

1A-38 Engine General Information and Diagnosis:

ABS or ESP

® control module check

1) Measure resistance at following connector terminals.

• Between “WHT/BLU” terminal and “WHT” terminal of

ABS or ESP

® control module connector.

• Between “WHT/RED” terminal and “RED” terminal of

ABS or ESP

® control module connector.

Is measured resistance below 1

Ω

CAN communication
circuit wire between
TCM and ECM
connector is open or
high resistance.

Substitute a known-
good ABS or ESP

control module and
recheck.

DTC check in ECM
1) Connect connectors to ECM and TCM with ignition

switch turned OFF.

2) Disconnect connectors from BCM with ignition switch

turned OFF.

3) Check ECM for DTC(s).

Is there DTC P1676?

Go to Step 10.

CAN communication
circuit wire between
BCM and CAN circuit
junction connector is
open or high resistance.
If wires are OK, check
BCM power and ground
circuit. If circuits are OK,
substitute a known-
good BCM and recheck.

10 DTC check

1) Disconnect connector from keyless start control module

(if equipped) with ignition switch turned OFF.

2) Check ECM for DTC.

Is there DTC P1676?

Go to Step 11.

CAN communication
circuit wire between
keyless start control
module and CAN circuit
junction connector is
open or high resistance.
If wires are OK, check
keyless start control
module power and
ground circuits. If
circuits are OK,
substitute a known-
good keyless start
control module and
recheck.

11 DTC check

1) Disconnect connector from combination meter with

ignition switch turned OFF.

2) Check ECM for DTC.

Is there DTC P1676?

Go to Step 12.

CAN communication
circuit wire between
combination meter and
CAN circuit junction
connectors is open or
high resistance. If wires
are OK, check
combination meter
power and ground
circuits. If circuits are
OK, substitute a known-
good combination meter
and recheck.

Step

Action

Yes

Engine General Information and Diagnosis: 1A-39

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?

Go to Step 13.

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.

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

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