Suzuki Grand Vitara JB416 / JB420. Manual - part 59

1A-185 Engine General Information and Diagnosis: 

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 “G31-1” terminal of BCM connector and 

vehicle body ground

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

vehicle body ground

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

vehicle body ground

• Between “G31-4” terminal of BCM 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 “G31-1” terminal of BCM connector and 

vehicle body ground

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

vehicle body ground

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

vehicle body ground

• Between “G31-4” terminal of BCM 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”.

17 Vehicle spec check

Is vehicle equipped with A/T?

Go to Step 18.

Go to Step 19.

18 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 19.

Substitute a known-
good ECM and recheck.

19 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.

Substitute a known-
good BCM (included in 
junction block 
assembly) and recheck.

Step

Action

Yes

No

Engine General Information and Diagnosis:  1A-186

DTC P1685: CAN Communication (Reception Error for ABS Control Module)

S5JB0A1104094

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”.

 

DTC detecting condition

Trouble area

Reception error of communication data for ABS hydraulic 
unit / control module assembly is detected for longer than 
specified time continuously.
(1 driving detection logic)

• ECM
• ABS hydraulic unit / control module assembly
• 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

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.

4

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

hydraulic unit / control module connector terminals with 
ignition switch turned OFF.

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

engine running.

Is there DTC P1685?

Go to Step 5.

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

1A-187 Engine General Information and Diagnosis: 

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 ABS hydraulic unit / control module 
assembly
1) Check DTC U1073 in ABS hydraulic unit / control 

module assembly.

Is it indicated?

Go to “DTC U1073: 
Control Module 
Communication Bus Off 
in Section 4E”.

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 P1685?

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) with 

ignition switch turned OFF.

2) Check ECM for DTC.

Is there DTC P1685?

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 P1685?

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 P1685?

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-188

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 P1685?

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 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

Is each resistance below 1 

Ω

?

Go to Step 13.

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

13 CAN communication line circuit insulation check

1) Measure resistance between “E23-4” and “E23-19” 

terminals of ECM connector.

Is resistance infinity?

Go to Step 14.

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

14 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

Is each resistance infinity?

Go to Step 15.

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

15 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

Is each voltage 0 – 1 V?

Go to Step 16.

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

16 ECM circuit check

1) Connect connector to ABS hydraulic unit / control 

module with ignition switch turned OFF.

2) Measure resistance at following connector terminals.

• Between “E03-8” and “E03-6” terminals of ABS 

hydraulic unit / control module connector

• Between “E03-10” and “E03-12” terminals of ABS 

hydraulic unit / control module connector

Is resistance below 1 

Ω

?

Go to Step 17.

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

Step

Action

Yes

No