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