Suzuki Grand Vitara JB416 / JB420. Manual - part 235

5A-74 Automatic Transmission/Transaxle: 

Inspection of TCM and Its Circuits

S5JB0A5104061

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)

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

Automatic Transmission/Transaxle:  5A-75

Connector “E92”

Terminal Wire color

Circuit

Standard 

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 (+)

*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.)

5

GRN/YEL

TCC pressure control 
solenoid valve (+)

*0 – 0.6 V

↑↓

10 – 14 V

(“Reference 

Waveform 

No. 2: ”)

Engine running at idling.
(Output signal is duty pulse. Duty ratio varies 
depending on torque converter clutch operating 
condition.)

6

BLK/WHT Power source

10 – 14 V Ignition switch ON

7

WHT

CAN communication 
line (Low)

*2.5 – 3.6 V

↑↓

1.6 – 2.5 V

(“Reference 

Waveform 

No. 3: ”)

Engine running at idling with after warming up.
(CAN communication signal is pulse. Pulse signal 
frequency varies depending on engine condition.))

8

—

—

—

—

9

—

—

—

—

10

YEL/BLK

3 position switch (–)

0 – 1 V

Ignition switch ON

11

YEL/BLK

Transmission fluid 
temperature sensor (+)

2.9 – 3.1 V Ignition switch ON, fluid temperature is 20 

°C (68 °F)

0.3 – 0.5 V Ignition switch ON, fluid temperature is 100 

°C (212 °F)

12

ORN

Transmission fluid 
temperature sensor (–)

0 – 1 V

Ignition switch ON

13

—

—

—

—

14

—

—

—

—

15

GRN/RED

Shift solenoid valve-B 
(No.2)

9 – 14 V

Ignition switch ON, select lever in “P” range

16

GRN

Shift solenoid valve-A 
(No.1)

9 – 14 V

Ignition switch ON, select lever in “P” range

17

RED

CAN communication 
line (High)

*2.5 – 3.6 V

↑↓

1.6 – 2.5 V

(“Reference 

Waveform 

No. 3: ”)

Engine running at idling with after warming up.
(CAN communication signal is pulse. Pulse signal 
frequency varies depending on engine condition.)

18

—

—

—

—

19

—

—

—

—

20

YEL/RED 3 position switch (+)

2.4 – 4.3 V

Ignition switch ON, select lever in “P”, “R”, “N” or “D” 
range

0.8 – 2.4 V Ignition switch ON, select lever in “3”, “2” or “L” range

21

—

—

—

—

22

—

—

—

—

23

BLK

Ground

0 – 1 V

Ignition switch ON

24

WHT

Power source for back-
up

10 – 14 V Constantly

5A-76 Automatic Transmission/Transaxle: 

Connector “E93”

Terminal Wire color

Circuit

Standard 

voltage

Condition

1

RED

Transmission range 
sensor (“R” range)

8 – 14 V

Ignition switch ON, selector lever at “R” range

0 – 1 V

Ignition switch ON, selector lever at other than “R” 
range

2

—

—

—

—

3

—

—

—

—

4

PNK/WHT 4L/N switch

8 – 14 V

Ignition switch ON, transfer position in 4H

0 – 1 V

Ignition switch OFF, transfer position in 4L and N

5

WHT

Output shaft speed 
sensor (+)

0 – 1 V

Ignition switch ON, engine stops

*(“Referenc

e Waveform 

No. 4: ”)

While engine running.
(Output signal is waveform. Waveform frequency varies 
depending on output shaft speed. (18 pulses are 
generated par 1 input shaft revolution.))

6

BLU

Input shaft speed 
sensor (+)

0 – 1 V

Ignition switch ON, engine stops.

*(“Referenc

e Waveform 

No. 5: ”)

While engine running.
(Output signal is waveform. Waveform frequency varies 
depending on output shaft speed. (24 pulses are 
generated par 1 input shaft revolution.))

7

GRN

Transmission range 
sensor (“D” range)

8 – 14 V

Ignition switch ON, selector lever at “D” range

0 – 1 V

Ignition switch ON, selector lever at other than “D” 
range

8

GRN/ORN

Transmission range 
sensor (“N” range)

8 – 14 V

Ignition switch ON, selector lever at “N” range

0 – 1 V

Ignition switch ON, selector lever at other than “N” 
range

9

—

—

—

—

10

—

—

—

—

11

—

—

—

—

12

PNK/BLK Diagnosis switch

8 – 14 V

Ignition switch ON

13

—

—

—

—

14

ORN

Output shaft speed 
sensor (–)

2 – 3 V

Ignition switch ON, engine at stop

15

—

—

—

—

16

PNK

Input shaft speed 
sensor (–)

2 – 3 V

Ignition switch ON, engine at stop

17

—

—

—

—

18

GRN/WHT

Transmission range 
sensor (“L” range)

8 – 14 V

Ignition switch ON, selector lever at “L” range

0 – 1 V

Ignition switch ON, selector lever at other than “L” 
range

19

GRN/ORN

Transmission range 
sensor (“2” range)

8 – 14 V

Ignition switch ON, selector lever at “2” range

0 – 1 V

Ignition switch ON, selector lever at other than “2” 
range

20

PNK

Transmission range 
sensor (“P” range)

8 – 14 V

Ignition switch ON, selector lever at “P” range

0 – 1 V

Ignition switch ON, selector lever at other than “P” 
range

21

—

—

—

—

22

—

—

—

—

23

PPL/WHT Data link connector

8 – 14 V

Ignition switch ON

24

—

—

—

—

25

—

—

—

—

26

—

—

—

—

Automatic Transmission/Transaxle:  5A-77

Reference Waveform No. 1
Pressure control solenoid valve signal at engine idling.

Reference Waveform No. 2
TCC pressure control solenoid valve signal at engine 
idling.

Reference Waveform No. 3
CAN communication line (High & Low) signal at engine 
idling.

Reference Waveform No. 4
Output shaft speed sensor signal at vehicle speed 40 
km/h (25 mile/h).

Measurement 
terminal

CH1: “E92-4” to “E92-1”

Oscilloscope 
setting

CH1: 5 V/DIV
TIME: 20 ms/DIV

Measurement 
condition

• After warmed up to normal 

operating temperature

• Engine at specified idle speed 

with “P” range.

Measurement 
terminal

CH1: “E92-5” to “E92-1”

Oscilloscope 
setting

CH1: 5 V/DIV
Time: 2 ms/DIV

Measurement 
condition

• After warmed up to normal 

operating temperature

• Engine at specified idle speed 

with “P” range

I3RM0B510029-01

I4RS0A510024-01

Measurement 
terminal

CH1: “E92-7” to “E92-1”
CH2: “E92-17” to “E92-1”

Oscilloscope 
setting

CH1: 1 V/DIV
TIME: 100 

µs/DIV

Measurement 
condition

• After warmed up to normal 

operating temperature

• Engine at specified idle speed 

with “P” range.

Measurement 
terminal

CH1: “E93-5” to “E92-1”

Oscilloscope 
setting

CH1: 5 V/DIV
TIME: 2 ms/DIV

Measurement 
condition

• After warmed up to normal 

operating temperature

• Drive vehicle at 40 km/h (25 

mile/h).

I3RM0B510030-01

I5JB0A510046-02