Suzuki Grand Vitara JB416 / JB420 (ESP model). Service manual — part 82

5A-27 Automatic Transmission/Transaxle:

DTC P1875: 4L Switch Circuit Malfunction (Open)

S5JB0E5104045

Wiring Diagram
Refer to “DTC P1874: 4L Switch Circuit Malfunction (Short)”.

DTC Detecting Condition and Trouble Area

DTC Confirmation Procedure

1) Connect scan tool to DLC with ignition switch OFF.
2) Clear DTCs in TCM and ECM memories by using scan tool.
3) Start engine and transfer position switch to “4L” position.
4) Keep engine running at idle speed for 10 seconds or more with select lever “D” range.
5) Start vehicle and increase vehicle speed to about 50 km/h (31 mile/h) in “4L” position for 2 minutes.
6) Stop vehicle.
7) Check DTC, pending DTC and freeze-frame data.

4

4L switch and its circuit check
1) Connect SUZUKI scan tool to DLC with ignition switch

OFF.

2) Turn ignition switch ON.
3) Select “DATA LIST” mode on scan tool.
4) Check 4L/N switch signal (ON or OFF) on display when

turning transfer position switch to each position.

4L/N switch specifications (scan tool)
“4H” position: OFF
“4L” position: ON

Is OFF / ON displayed as described above?

Intermittent trouble or
faulty TCM. Check for
intermittent trouble
referring to “Intermittent
and Poor Connection
Inspection in Section 00
in related manual”. If
OK, substitute a known-
good TCM and recheck.

Go to Step 6.

5

4L/N switch and its circuit check
1) Turn ignition switch ON.
2) Check terminal voltage “E93-4” of TCM connector

connected when turning transfer position switch to each
position.

4L/N switch specifications
“4H” position: 10 – 14 V
“4L” position: 0 – 1 V

Is voltage as specified?

Intermittent trouble or
faulty TCM. Check for
intermittent trouble
referring to “Intermittent
and Poor Connection
Inspection in Section 00
in related manual”. If
OK, substitute a known-
good TCM and recheck.

Go to Step 6.

6

4L/N switch check
1) Check 4WD low switch for operation referring to

“Transfer Assembly Inspection: Motor-Shift Type
(Transfer with Shift Actuator) in Section 3C”.

Is check result satisfactory?

4L/N circuit is shorted to
ground. If wire and
connections are OK,
substitute a known-
good TCM and recheck.

Replace 4L/N switch.

Step

Action

Yes

No

DTC Detecting Condition

Trouble Area

Actual transfer position is 4L although TCM detected low switch is
turned OFF with vehicle speed between 29 km/h (18 mile/h) and
88 km/h (55 mile/h). (if equipped with 4L/N switch)
(1 driving cycle detection logic)

• 4L/N switch or its circuit.
• TCM

Automatic Transmission/Transaxle: 5A-28

DTC Troubleshooting

Inspection of TCM and Its Circuits

S5JB0E5104049

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 in

related manual”.

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).

Step

Action

Yes

No

1

Vehicle speed signal check
1) Check DTC in ECM and ABS/ESP

® control module

referring to “DTC Check in Section 1A in related manual”
or “DTC Check in Section 4E”.

Is there DTC P P0500: Vehicle speed sensor (VSS)
malfunction in ECM and/or DTC C1021, C1022, C1025,
C1026, C1031, C1032, C1035 and/or C1036 in ABS/ESP

®

control module?

Go to applicable DTC
diag. flow.

Go to Step 2.

2

Was “A/T System Check” performed?

Go to Step 3.

Go to “A/T System
Check in related
manual”.

3

Do you have SUZUKI scan tool?

Go to Step 4.

Go to Step 5.

4

4L switch and its circuit check
1) Connect SUZUKI scan tool to DLC with ignition switch

OFF.

2) Turn ignition switch ON.
3) Select “DATA LIST” mode on scan tool.
4) Check 4L/N switch signal (ON or OFF) on display when

turning transfer position switch to each position.

4L/N switch specifications
“4H” position: OFF
“4L” position: ON

Is OFF / ON displayed as described above?

Intermittent trouble or
faulty TCM. Check for
intermittent trouble
referring to “Intermittent
and Poor Connection
Inspection in Section 00
in related manual”. If
OK, substitute a known-
good TCM and recheck.

Go to Step 6.

5

4L/N switch and its circuit check
1) Turn ignition switch ON.
2) Check terminal voltage “E93-4” of TCM connector

connected when turning transfer position switch to each
position.

4L/N switch specifications
“4H” position: 10 – 14 V
“4L” position: 0 – 1 V

Is voltage as specified?

Intermittent trouble or
faulty TCM. Check for
intermittent trouble
referring to “Intermittent
and Poor Connection
Inspection in Section 00
in related manual”. If
OK, substitute a known-
good TCM and recheck.

Go to Step 6.

6

4L/N switch check
1) Check 4L/N switch for operation referring to “Transfer

Assembly Inspection: Motor-Shift Type (Transfer with
Shift Actuator) in Section 3C”.

Is check result satisfactory?

4L/N switch circuit open.
If wire and connections
are OK, substitute a
known-good TCM and
recheck.

Replace 4L/N switch.

5A-29 Automatic Transmission/Transaxle:

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

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

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-30

Connector “E93”

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

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 (if
equipped)

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

—

—

—

—

Terminal Wire color

Circuit

Standard

voltage

Condition