Suzuki Grand Vitara JB416 / JB420 (ESP model). Service manual - part 11

 

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Suzuki Grand Vitara JB416 / JB420 (ESP model). Service manual - part 11

 

 

1A-40 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.

DTC Troubleshooting

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

 

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

Step

Action

Yes

No

1

Was “Engine and Emission Control System Check” 
performed?

Go to Step 2.

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

2

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.

3

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

Is there DTC P1674?

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

Go to Step 4.

4

ECM, ABS / ESP

® control module and BCM connector 

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

® 

control module and BCM connector terminals with 
ignition switch turned OFF.

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

engine running.

Is there DTC P1678?

Go to Step 5.

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

Engine General Information and Diagnosis:  1A-41

5

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.

6

DTC check in BCM
1) Check DTC U1073 in BCM.

Is it indicated?

Go to “DTC U1073 (No. 
1073): Control Module 
Communication Bus Off 
in Section 10B”.

Go to Step 7.

7

CAN communication circuit check
1) Disconnect connectors from BCM and ECM.
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 BCM connector.

• Circuit resistance of CAN communication circuit is 

less than 1 

Ω between “WHT/BLU” terminal of ECM 

connector and “WHT” terminal of BCM connector.

Is it in good condition?

Go to Step 9.

Go to Step 8.

8

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 

?

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

Substitute a known-
good ABS or ESP

® 

control module and 
recheck.

9

DTC check 
1) Connect connectors to BCM and ECM with ignition 

switch turned OFF.

2) Disconnect connectors from TCM (for A/T model) with 

ignition switch turned OFF.

3) Check ECM for DTC.

Is there DTC P1678?

Go to Step 10.

CAN communication 
circuit wire between 
TCM and CAN circuit 
junction connector is 
open or high resistance. 
If wires are OK, check 
TCM power and ground 
circuits. If circuits are 
OK, substitute a known-
good TCM (for A/T 
model) 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 P1678?

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.

Step

Action

Yes

No

1A-42 Engine General Information and Diagnosis: 

11 DTC check

1) Disconnect connector from combination meter with 

ignition switch turned OFF.

2) Check ECM for DTC.

Is there DTC P1678?

Go to Step 12.

CAN communication 
circuit wire between 
combination meter and 
CAN circuit junction 
connector 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.

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 P1678?

Go to Step 13.

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.

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 P1678?

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 
tangle sensor power 
and ground circuits. If 
circuits are OK, 
substitute a known-
good steering angle 
sensor and recheck.

Step

Action

Yes

No

Engine General Information and Diagnosis:  1A-43

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 Vehicle spec check

Is vehicle equipped with A/T?

Go to Step 16.

Go to Step 17.

16 DTC check in TCM (for A/T model)

1) Connect connectors to all control modules with ignition 

switch turned OFF.

2) Check DTC P1778 in TCM (for A/T model).

Is it indicated?

Go to Step 17.

Substitute a known-
good ECM and recheck.

17 Combination meter operation check

1) Check combination meter operation for seat belt warning 

lamp by fastening and unfastening driver side seat belt 
with ignition switch turned ON.

Is it check result satisfactory?

Substitute a known-
good ECM and recheck.

Check BCM power and 
ground circuits, If 
circuits are OK, 
substitute a known-
good BCM and recheck.

Step

Action

Yes

No

 

 

 

 

 

 

 

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