Suzuki Grand Vitara JB416 / JB420. Manual - part 58

1A-181 Engine General Information and Diagnosis: 

13 CAN communication line circuit continuity check

1) Disconnect connectors from all control modules 

communicating by CAN with ignition switch turned OFF.

2) Measure resistance at following connector terminals.

• Between “E23-4” terminal of ECM connector and 

“E03-10” terminal of ABS hydraulic unit / control 
module connector

• Between “E23-19” terminal of ECM connector and 

“E03-8” terminal of ABS hydraulic unit / control 
module connector

• Between “E03-12” terminal of ABS hydraulic unit / 

control module connector and “E92-17” terminal of 
TCM connector

• Between “E03-6” terminal of ABS hydraulic unit / 

control module connector and “E92-7” terminal of 
TCM connector

Is each resistance below 1 

Ω

?

Go to Step 14.

Repair open or high 
resistance of CAN 
communication line 
circuit referring to 
“Precaution for CAN 
Communication System 
in Section 00”.

14 CAN communication line circuit insulation check

1) Measure resistance at following connector terminals.

• Between “E23-4” and “E23-19” terminal of ECM 

connector

• Between “E92-17” and “E92-7” terminal of TCM 

connector

Is reach resistance infinity?

Go to Step 15.

Repair insulation of 
CAN communication 
line circuit referring to 
“Precaution for CAN 
Communication System 
in Section 00”.

15 CAN communication line circuit ground short check

1) Measure resistance at following connector terminals.

• Between “E23-4” terminal of ECM connector and 

vehicle body ground

• Between “E23-19” terminal of ECM connector and 

vehicle body ground

• Between “E92-7” terminal of TCM connector and 

vehicle body ground

• Between “E92-17” terminal of TCM connector and 

vehicle body ground

Is each resistance infinity?

Go to Step 16.

Repair short to ground 
of CAN communication 
line circuit referring to 
“Precaution for CAN 
Communication System 
in Section 00”.

16 Check for short circuit of CAN communication line to 

power circuit
1) Measure voltage at following connector terminals with 

ignition switch turned ON.
• Between “E23-4” terminal of ECM connector and 

vehicle body ground

• Between “E23-19” terminal of ECM connector and 

vehicle body ground

• Between “E92-7” terminal of TCM connector and 

vehicle body ground

• Between “E92-17” terminal of TCM connector and 

vehicle body ground

Is each voltage 0 – 1 V?

Go to Step 17.

Repair short to power 
supply of CAN 
communication line 
circuit referring to 
“Precaution for CAN 
Communication System 
in Section 00”.

Step

Action

Yes

No

Engine General Information and Diagnosis:  1A-182

DTC P1678: CAN Communication (Reception Error for BCM)

S5JB0A1104061

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”.

 

17 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

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”.

2

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

OFF.

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

control module assembly, 4WD control module (for J20 
engine), 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 
in BCM, ABS hydraulic unit / control module assembly and 
4WD control module (for J20 engine), 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.

1A-183 Engine General Information and Diagnosis: 

4

ECM, ABS hydraulic unit / control module and BCM 
connector check
1) Check for proper connection at each ECM, ABS 

hydraulic unit / 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”.

5

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

Power and Ground Circuit Check”.

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

DTC check in ECM
1) Disconnect connector from BCM with ignition switch 

turned OFF.

2) Check ECM for DTC(s).

Is there DTC P1678?

Go to Step 8.

“G31-1” or “G31-3” 
circuit wire between 
BCM and CAN circuit 
junction connector is 
open or high resistance. 
If wires are OK, 
substitute a known-
good BCM and recheck.

8

DTC check in ECM
1) Disconnect connectors from TCM (for A/T model) and 

connect connector to ABS hydraulic unit / control module 
with ignition switch turned OFF.

2) Check ECM for DTC.

Is there DTC P1678?

Go to Step 9.

“E92-17” or “E92-7” 
circuit wire between 
TCM and CAN circuit 
junction connector is 
open or high resistance. 
If wires are OK, 
substitute a known-
good TCM (for A/T 
model) and recheck.

9

DTC check in ECM
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 10.

“G44-19” or “G44-18” 
circuit wire between 
keyless start control 
module and CAN circuit 
junction connector is 
open or high resistance. 
If wires are OK, 
substitute a known-
good keyless start 
control module and 
recheck.

10 DTC check in ECM

1) Disconnect connector from combination meter with 

ignition switch turned OFF.

2) Check ECM for DTC.

Is there DTC P1678?

Go to Step 11.

“G28-10” or “G28-8” 
circuit wire between 
combination meter and 
CAN circuit junction 
connector is open or 
high resistance. If wires 
are OK, substitute a 
known-good 
combination meter or 
keyless start control 
module (if equipped) 
and recheck.

Step

Action

Yes

No

Engine General Information and Diagnosis:  1A-184

11 DTC check in ECM

1) Disconnect connector from 4WD control module (for J20 

engine) with ignition switch turned OFF.

2) Check ECM for DTC.

Is there DTC P1678?

Go to Step 12.

“E91-22” or “E91-23” 
circuit wire between 
4WD control module 
and CAN circuit junction 
connector is open or 
high resistance. If wires 
are OK, substitute a 
known-good 4WD 
control module and 
recheck.

12 ABS hydraulic unit / control module check

1) Measure resistance at following connector terminals.

• Between “E03-8” terminal and “E03-6” terminal of 

ABS hydraulic unit / control module connector.

• Between “E03-10” terminal and “E03-12” terminal of 

ABS hydraulic unit / control module connector.

Is measured resistance below 1 

Ω

?

Go to Step 13.

Substitute a known-
good ABS hydraulic unit 
/ control module and 
recheck.

13 CAN communication line circuit continuity check

1) Disconnect connectors from all control modules 

communicating by CAN with ignition switch turned OFF.

2) Measure resistance at following connector terminals.

• Between “E23-4” terminal of ECM connector and 

“E03-10” terminal of ABS hydraulic unit / control 
module connector

• Between “E23-19” terminal of ECM connector and 

“E03-8” terminal of ABS hydraulic unit / control 
module connector

• Between “E03-12” terminal of ABS hydraulic unit / 

control module connector and “G31-1” terminal of 
BCM connector

• Between “E03-6” terminal of ABS hydraulic unit / 

control module connector and “G31-3” terminal of 
BCM connector

• Between “G31-2” terminal of BCM connector and 

“RED” wire terminal of DLC

• Between “G31-4” terminal of BCM connector and 

“WHT” wire terminal of DLC

Is each resistance below 1 

Ω

?

Go to Step 14.

Repair open or high 
resistance of CAN 
communication line 
circuit referring to 
“Precaution for CAN 
Communication System 
in Section 00”.

14 CAN communication line circuit insulation check

1) Measure resistance at following connector terminals.

• Between “E23-4” and “E23-19” terminal of ECM 

connector

• Between “G31-1” and “G31-3” terminal of BCM 

connector

• Between “G31-2” and “G31-4” terminal of BCM 

connector

Is each resistance infinity?

Go to Step 15.

Repair insulation of 
CAN communication 
line circuit referring to 
“Precaution for CAN 
Communication System 
in Section 00”.

Step

Action

Yes

No