Suzuki Grand Vitara JB416 / JB420 / JB419. Service manual - part 255

3C-51 Transfer: Motor-Shift Type (Transfer with Shift Actuator)

DTC U1121: Lost Communication with ABS / Electronic Stability Program Hydraulic Unit / Control
Module

S6JB0A3314029

Wiring Diagram
Refer to “DTC U1073: Control Module Communication Buss Off: Motor-Shift Type (Transfer with Shift Actuator)”.

DTC Detecting Condition and Trouble Area

DTC Confirmation Procedure

1) Clear DTC using scan tool.
2) Start engine and run it for 1 min. or more.
3) Stop vehicle and check DTC.

Troubleshooting

DTC detecting condition

Trouble area

Reception error of communication data for ABS / ESP

hydraulic unit / control module is detected for longer than
specified time continuously.

• CAN communication circuit
• ABS / ESP

® hydraulic unit / control module

• 4WD control module

Step

Action

Yes

Was “4WD control system check” performed?

Go to Step 2.

Go to “4WD Control
System Check: Motor-
Shift Type (Transfer with
Shift Actuator)”.

DTC check
1) Check DTC in 4WD control module.

Is DTC U1100 and DTC U1073 detected together?

Go to “DTC U1073:
Control Module
Communication Buss
Off: Motor-Shift Type
(Transfer with Shift
Actuator)”.

Go to Step 3.

DTC check
1) Check DTC in ABS or ESP

® hydraulic unit / control

module.

Is DTC PU1073 detected?

Go to “DTC U1073:
Control Module
Communication Bus Off
(Diesel Engine Model)
in Section 4E” or “DTC
U1073: Control Module
Communication Bus Off
in Section 4F”.

Go to Step 4.

Check each control module connectors
1) Check connection of connectors of all control modules

communicating by means of CAN.

2) Recheck in 4WD control module.

Is DTC U1100 detected?

Go to Step 5.

Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.

CAN communication circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors of all control modules

communicating by means of CAN.

3) Check CAN communication circuit between control

modules for open, short and high resistance.

Is each CAN communication circuit in good condition?

Check ABS or ESP

hydraulic unit / control
module power and
ground circuit. If circuit
is OK, substitute a
known-good ABS or
ESP

® hydraulic unit /

control module and
recheck.

Repair circuit.

Transfer: Motor-Shift Type (Transfer with Shift Actuator) 3C-52

Inspection of 4WD Control Module and Its Circuits

S6JB0A3314030

4WD control module and its circuits can be checked at coupler connected to 4WD control module by measuring
voltage, pulse signal.

CAUTION

4WD control module cannot be checked by itself. It is strictly prohibited to connect voltmeter or
ohmmeter to 4WD control module with couplers disconnected from it.

Voltage and Signal Check

1) Check voltage using voltmeter (1) connected to each terminal of couplers.
2) Check signal using oscilloscope (2) connected to each terminal of couplers.

NOTE

• As each terminal voltage is affected by the battery voltage, confirm that it is 11 V or more when

ignition switch is turned ON.

• Pulse signal cannot be measured by voltmeter. It can be measured by oscilloscope.
• Item with asterisk (*) in normal voltage column can be read only by oscilloscope.

Terminal arrangement of 4WD control module connector (Viewed from harness side)

I4JA01332053-01

I4JA01332054-01

3C-53 Transfer: Motor-Shift Type (Transfer with Shift Actuator)

Terminal

Number

Wire

Color

Circuit

Normal

Voltage

Condition

E91-1

BLK

Ground

0 – 1 V

—

E91-2

BLU

Transfer actuator
motor 1

10 – 14 V

Ignition switch turned to ON position and transfer shift
actuator being rotated N

→ 4H → 4H-lock direction or 4L-

lock

→ 4H-lock direction

0 – 1 V

Ignition switch turned to ON position and transfer shift
actuator in other than above-mentioned condition

E91-3

YEL

Transfer actuator
motor 2

10 – 14 V

Ignition switch turned to ON position and transfer shift
actuator being rotated 4H-lock

→ 4H → N direction or

4H-lock

→ 4L-lock direction

0 – 1 V

Ignition switch turned to ON position and transfer shift
actuator in other than above-mentioned condition

E91-4

—

E91-5

—

E91-6

—

E91-7

BLK/ORN Clutch switch

10 – 14 V

Ignition switch turned to ON position and clutch pedal
released

0 – 1 V

Ignition switch turned to ON position and clutch pedal
kept depressing

E91-8

PNK

Diagnosis switch

4 – 5 V

Ignition switch turned to ON position

E91-9

—

E91-10

BLK

Ground

0 – 1 V

—

E91-11

WHT

Power source for
internal memory

10 – 14 V

—

E91-12 BLK/WHT Ignition switch

10 – 14 V

Ignition switch turned to ON position

E91-13 BLK/WHT 4L/N switch

10 – 14 V

Ignition switch turned to ON position and transfer shifted
to 4H or 4H-lock position

0 – 1 V

Ignition switch turned to ON position and transfer shifted
to 4L-lock or N position

E91-14 RED/GRN

Center differential lock
switch

10 – 14 V

Ignition switch turned to ON position and transfer shifted
to 4H-lock or 4L-lock position

0 – 1 V

Ignition switch turned to ON position and transfer shifted
to N or 4H position

E91-15

—

E91-16

—

E91-17

—

E91-18

LT GRN Transfer switch 1

10 – 14 V

Ignition switch turned to ON position and transfer switch
at 4H, N or 4L-lock position

0 – 1 V

Ignition switch turned to ON position and transfer switch
at N position

E91-19

BLU/BLK Transfer switch 2

10 – 14 V

Ignition switch turned to ON position and transfer switch
at 4L-lock position

0 – 1 V

Ignition switch turned to ON position and transfer switch
at 4H, 4H-lock or N position

E91-20 BLU/ORN Transfer switch 3

10 – 14 V

Ignition switch turned to ON position and transfer switch
at 4H or N position

0 – 1 V

Ignition switch turned to ON position and transfer switch
at 4H-lock or 4L-lock position

E91-21 PPL/WHT

Data link connector
(DLC)

10 – 14 V

Ignition switch turned to ON position

E91-22

RED

CAN communication
line (High)

*2.5 – 3.5 V Ignition switch turned to ON position

E91-23

WHT

CAN communication
line (Low)

*1.5 – 2.5 V Ignition switch turned to ON position

E91-24

BLK/YEL

Transfer actuator
position switch
(ground)

0 – 1 V

—

Transfer: Motor-Shift Type (Transfer with Shift Actuator) 3C-54

E91-25

RED

Transfer actuator
position switch 1
(power)

Approx. 4 V

Ignition switch turned to ON position and transfer shifted
to 4H-lock position

Approx. 2 V

Ignition switch turned to ON position and transfer shifted
to 4H position

Approx. 1 V

Ignition switch turned to ON position and transfer shifted
to 4L-lock or N position

Approx. 0 V Ignition switch turned to OFF position

E91-26

RED/BLK

Transfer actuator
position switch 2
(power)

Approx. 4 V

Ignition switch turned to ON position and transfer shifted
to 4L-lock position

Approx. 2 V

Ignition switch turned to ON position and transfer shifted
to N position

Approx. 1 V

Ignition switch turned to ON position and transfer shifted
to 4H or 4H-lock position

Approx. 0 V Ignition switch turned to OFF position

Terminal

Number

Wire

Color

Circuit

Normal

Voltage

Condition

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