Suzuki Grand Vitara JB627. Manual - part 223

5A-76 Automatic Transmission/Transaxle: 

DTC Troubleshooting

NOTE
Upon completion of inspection and repair work, perform “Intermittent and Poor Connection Inspection 
in Section 00” and confirm that the trouble has been corrected.

 

Step

Action

Yes

No

1

Was “A/T System Check” performed?

Go to Step 2.

Go to “A/T System 
Check”.

2

Control module connector check
1) Check connection of connectors of all control modules 

communicating by means of CAN.

2) Recheck DTC in TCM. 

Is there DTC U0073?

Go to Step 3.

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

3

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?

Go to Step 4.

Repair circuit.

4

DTC check
1) Turn ignition switch to OFF position.
2) Connect connectors of disconnected control modules 

communicating by means of CAN.

3) Disconnect connector of any one of control module other 

than TCM.

4) Recheck DTC for TCM.

Is DTC U0073 detected?

Disconnect connectors 
of control modules other 
than the one whose 
connector is 
disconnected in Step 3) 
one by one and check 
that DTC U0073 is 
detected by TCM each 
time connector is 
disconnected. When 
DTC U0073 is not 
detected by TCM while 
checking in this way, go 
to description under 
“NO” below. If DTC 
U0073 is detected by 
TCM even when 
connectors of all control 
modules that use CAN 
communication with 
TCM are disconnected, 
substitute a known good 
TCM and recheck.

Check power and 
ground circuit of control 
module disconnected in 
Step 3). If circuit is OK, 
substitute a known good 
control module 
disconnected in Step 3) 
and recheck.

Automatic Transmission/Transaxle:  5A-77

DTC U0100: Lost Communication with ECM

S6JB0B5104047

Wiring Diagram
Refer to “DTC U0073: Control Module Communication Bus Off”.

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 and pending DTC.

DTC Troubleshooting

NOTE
Upon completion of inspection and repair work, perform “Intermittent and Poor Connection Inspection 
in Section 00” and confirm that the trouble has been corrected.

 

DTC Detecting Condition

Trouble Area

Reception error of communication data for ECM is detected for 
longer than specified time continuously.
(1 driving cycle detection logic)

• ECM
• ABS or ESP

® control module

• TCM
• CAN communication line circuit

Step

Action

Yes

No

1

Was “A/T System Check” performed?

Go to Step 2.

Go to “A/T System 
Check”.

2

Control module connector check
1) Check connection of connectors of all control modules 

communicating by means of CAN.

2) Recheck DTC in TCM.

Is there DTC U0100?

Go to Step 3.

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

3

DTC check in ABS or ESP

® control module 

1) Check DTC in ABS or ESP

® control module.

Is there DTC U1100?

Go to Step 4.

Go to Step 5.

4

DTC check
1) Check DTC in ECM.

Is there DTC U0073?

Go to “DTC U0073: 
Control Module 
Communication Bus Off 
in Section 1A”.

Check ECM power and 
ground circuit. If circuit 
is OK, CAN 
communication circuit 
between ECM and ABS 
or ESP

® control module 

is open circuit.

5

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 TCM power and 
ground circuit. If circuit 
is OK, substitute a 
known-good TCM and 
recheck.

Repair circuit.

5A-78 Automatic Transmission/Transaxle: 

DTC U0140: Lost Communication with Body Control Module

S6JB0B5104048

Wiring Diagram
Refer to “DTC U0073: Control Module Communication Bus Off”.

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 and pending DTC.

DTC Troubleshooting

NOTE
Upon completion of inspection and repair work, perform “Intermittent and Poor Connection Inspection 
in Section 00” and confirm that the trouble has been corrected.

 

DTC Detecting Condition

Trouble Area

Reception error of communication data for BCM is detected for 
longer than specified time continuously.
(1 driving cycle detection logic but MIL does not light up)

• BCM
• TCM
• CAN communication line circuit

Step

Action

Yes

No

1

Was “A/T System Check” performed?

Go to Step 2.

Go to “A/T System 
Check”.

2

Control module connector check
1) Check connection of connectors of all control modules 

communicating by means of CAN.

2) Recheck DTC in TCM.

Is there DTC U0140?

Go to Step 3.

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

3

DTC check in BCM (bus off)
1) Check DTC in BCM.

Is there DTC U1073?

Go to “DTC U1073 (No. 
1073): Control Module 
Communication Bus Off 
in Section 10B”.

Go to Step 4.

4

DTC check
1) Check DTC in ECM.

Is there DTC U0140?

Check BCM power and 
ground circuit. If circuit 
is OK, substitute a 
known-good BCM and 
recheck.

Go to Step 5.

5

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 TCM power and 
ground circuit. If circuit 
is OK, substitute a 
known-good TCM and 
recheck.

Repair circuit.

Automatic Transmission/Transaxle:  5A-79

Inspection of TCM and Its Circuits

S6JB0B5104049

TCM and its circuits can be checked at TCM wiring connectors by measuring voltage, pulse signal and resistance.

CAUTION

!

 

TCM cannot be checked by itself, it is strictly prohibited to connect voltmeter or ohmmeter to TCM with 
connector disconnected from it.

 

1) Remove TCM (1) from vehicle referring to “Transmission Control Module (TCM) Removal and Installation”.
2) Connect TCM connectors (2) to TCM.
3) Check voltage and/or pulse signal at each terminal of connectors connected using voltmeter (3) and oscilloscope 

(4).

NOTE

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

switch is ON.

• Voltage with asterisk (*) cannot be measured by voltmeter because it is pulse signal. Check it with 

oscilloscope if necessary.

 

Terminal arrangement of TCM coupler (Viewed from harness side)

Connector “E92”

3. Body ground

3

4

1

2

I4RS0A510021-02

6

5

16 15 14 13 12 11

4 3

24 23

21

22

10 9

8

7

2

1

19

20

18 17

E92

17 16

26 25

15 14

6

5

3

4

2

13 12

23 22

24

11 10 9

21 20 19

8 7

18

1

E93

I5JB0A510151-01

Terminal 

number

Wire color

Circuit

Normal 

Voltage

Condition

1

BLK/ORN Ground

0 – 1 V

Ignition switch ON

2

BRN/RED

Pressure control 
solenoid valve (–)

0.6 – 1.0 V Ignition switch ON

3

PPL/WHT

TCC pressure control 
solenoid valve (–)

0.6 – 1.0 V Ignition switch ON

4

YEL/RED

Pressure control 
solenoid valve-A (+)

*0 – 0.6 V

↑↓

10 – 14 V

(“Reference 

Waveform 

No. 1: ”)

Engine running at idling.
(Output signal is duty pulse. Duty ratio varies 
depending on throttle valve opening.)