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