Suzuki Grand Vitara JB416 / JB420 / JB419. Manual - part 59

1A-183 Engine General Information and Diagnosis: For Petrol Engine Model

DTC Troubleshooting

NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to 
“Precautions for DTC Troubleshooting: For Petrol Engine Model”.

 

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: For 
Petrol Engine Model”.

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): For 
Petrol Engine Model”.

Go to Step 4.

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”.

5

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

Power and Ground Circuit Check: For Petrol Engine 
Model”.

Are they in good condition?

Go to Step 6.

Repair ECM power and/
or ground circuits.

6

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.

Engine General Information and Diagnosis: For Petrol Engine Model 1A-184

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.

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 

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.

9

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

No

1A-185 Engine General Information and Diagnosis: For Petrol Engine Model

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

No

Engine General Information and Diagnosis: For Petrol Engine Model 1A-186

DTC P1678: CAN Communication (Reception Error for BCM)

S6JB0A1114066

Wiring Diagram
Refer to “DTC P1674: CAN Communication (Bus Off Error): For Petrol Engine Model”.

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: For Petrol Engine Model”.

 

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: For 
Petrol Engine Model”.

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): For 
Petrol Engine Model”.

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”.