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

Ω

?

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