Suzuki Grand Vitara JB416 / JB420 (ESP model). Service manual - part 12

 

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Suzuki Grand Vitara JB416 / JB420 (ESP model). Service manual - part 12

 

 

1A-44 Engine General Information and Diagnosis: 

DTC P1685: CAN Communication (Reception Error for ABS or ESP

® Control Module)

S5JB0E1104067

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 ABS or ESP

® 

control module is detected for longer than specified time 
continuously.
(1 driving detection logic)

• ECM
• ABS  or  ESP

® control module

• 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

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 / ESP

® control module connector check

1) Check for proper connection at each ECM and ABS / 

ESP

® 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 
in related manual”.

Engine General Information and Diagnosis:  1A-45

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 ABS / ESP

® control module 

1) Check DTC U1073 in ABS / ESP

® control module.

Is it indicated?

• For vehicle without 

ESP

®, go to “DTC 

U1073: Control 
Module 
Communication Bus 
Off in Section 4E”.

• For vehicle with 

ESP

®, go to “DTC 

U1073: Control 
Module 
Communication Bus 
Off in Section 4F”.

Go to Step 7.

7

CAN communication circuit check
1) Disconnect connectors from ABS or ESP

® control 

module 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 “WHT/RED” terminal of ABS or ESP

® 

connector.

• Circuit resistance of CAN communication circuit is 

less than 1 

Ω between “WHT/BLU” terminal of ECM 

connector and “WHT/BLU” terminal of ABS / ESP

® 

control module connector.

Is it in good condition?

Go to Step 9.

Go to Step 8.

8

CAN communication circuit check
1) Connect connector to ABS or ESP

® control module with 

ignition switch turned OFF.

2) Measure resistance at following connector terminals.

• Between “WHT/BLU” and “WHT” terminals of ABS or 

ESP

® control module connector.

• Between “WHT/RED” and “RED” terminals of ABS or 

ESP

® control module connector.

Is resistance below 1 

?

CAN communication 
circuit wire between 
ABS or ESP

® control 

module and ECM 
connector is open or 
high resistance.

Substitute a known-
good ABS or ESP

® 

control module 
assembly and recheck.

9

DTC check in ECM
1) Connect connectors to ABS or ESP

® control module 

and ECM with ignition switch turned OFF.

2) Disconnect connector from BCM with ignition switch 

turned OFF.

3) Check ECM for DTC(s).

Is there DTC P1685?

Go to Step 8.

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

Step

Action

Yes

No

1A-46 Engine General Information and Diagnosis: 

10 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.

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.

11 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.

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 circuit. If circuit 
are OK, substitute a 
known-good keyless 
start control module and 
recheck.

12 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.

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.

13 DTC check in ECM

1) Disconnect connector from 4WD control module (if 

equipped) with ignition switch turned OFF.

2) Check ECM for DTC.

Is there DTC P1685?

Go to Step 12.

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.

Step

Action

Yes

No

Engine General Information and Diagnosis:  1A-47

14 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 P1685?

Go to Step 15.

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.

15 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 to 
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 16.

Repair or replace 
defective CAN 
communication circuit.

16 ABS warning lamp check

1) Connect connectors to all control modules 

communicating by CAN.

2) Turn ignition switch ON.

Is ABS warning lamp light up?

Substitute a known-
good ABS or ESP

® 

control module and 
recheck.

Substitute a known-
good ECM and recheck.

Step

Action

Yes

No

 

 

 

 

 

 

 

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