Suzuki Grand Vitara JB416 / JB420 / JB419. Manual - part 321

5A-75 Automatic Transmission/Transaxle:

DTC P1875: 4L Switch Circuit Malfunction (Open)

S6JB0A5104045

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.

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”. If OK, substitute a
known-good TCM and
recheck.

Go to Step 6.

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”. If OK, substitute a
known-good TCM and
recheck.

Go to Step 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

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-76

DTC Troubleshooting

Step

Action

Yes

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

® control module

referring to “DTC Check: For Petrol Engine Model in
Section 1A” 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.

Was “A/T System Check” performed?

Go to Step 3.

Go to “A/T System
Check”.

Do you have SUZUKI scan tool?

Go to Step 4.

Go to Step 5.

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”. If OK, substitute a
known-good TCM and
recheck.

Go to Step 6.

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”. If OK, substitute a
known-good TCM and
recheck.

Go to Step 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-77 Automatic Transmission/Transaxle:

DTC P1878: Torque Converter Clutch Shudder

S6JB0A5104046

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 warm it up to normal operating temperature.
4) Drive vehicle with 3rd or 4th gear in “D” range and slip controlled lock-up ON for 20 seconds or longer referring to

“Automatic Gear Shift Table”.

5) Stop vehicle.
6) Check DTC, pending DTC and freeze-frame data.

DTC Troubleshooting

DTC P2763: Torque Converter Clutch (TCC) Circuit High

S6JB0A5104047

Wiring Diagram

DTC Detecting Condition

Trouble Area

The acceleration slip control function stops when the
variation in the output revolution speed of the specified
amplitude and specified cycle is detected within a specified
period of time. When the specified variation is not detected
after the acceleration slip control stops.
(20 driving cycle detection logic)

• Mismatching ATF
• Torque converter clutch malfunction
• TCM

Step

Action

Yes

Was “A/T System Check” performed?

Go to Step 2.

Go to “A/T System
Check”.

1) Change A/T fluid referring to “A/T Fluid Change”.
2) Check DTC after performing “DTC Confirmation

Procedure: ”.

Is DTC P1878 still indicated?

Faulty torque converter
clutch. Replace torque
converter.

System is in good
condition.

12V

E92-3

E92-5

GRN/YEL

PPL/WHT

16 15 14 13 12 11

4 3

24 23

10 9

18 17

E92

17 16

26 25

15 14

13 12

23 22

11 10 9

21 20 19

8 7

E93

I5JB0A510027-01

1. TCC pressure control solenoid valve

3. Terminal arrangement of TCM connector (viewed from harness side)

2. TCM

Automatic Transmission/Transaxle: 5A-78

DTC Detecting Condition and Trouble Area

DTC Confirmation Procedure

WARNING

• When performing a road test, select a place where there is no traffic or possibility of a traffic

accident and be very careful during testing to avoid occurrence of an accident.

• Road test should be carried out with 2 persons, a driver and tester, on a level road.

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.
4) Keep engine running at idle speed in “P” range for 10 seconds or more.
5) Check DTC, pending DTC and freeze-frame data.

DTC Troubleshooting

DTC Detecting Condition

Trouble Area

Voltage of TCC pressure control solenoid valve TCM terminal is
high although TCM is commanding TCC pressure control solenoid
to turn OFF.
(1 driving cycle detection logic)

• TCC pressure control solenoid valve circuit

shorted to power circuit.

• Malfunction of TCC pressure control solenoid

valve.

• TCM

Step

Action

Yes

Was “A/T System Check” performed?

Go to Step 2.

Go to “A/T System
Check”.

Check TCC pressure control solenoid valve circuit for
power supply short
1) Disconnect TCM connectors.
2) Check for proper connection to TCM at terminal “E92-3”

and “E92-5”.

3) If connection is OK, turn ignition switch ON and measure

voltage between terminal “E92-3” of disconnected
harness side TCM connector and ground.

Is it 0 – 2 V?

Go to Step 3.

TCC pressure control
solenoid valve circuit is
shorted to power supply
circuit. If circuit is OK,
go to Step 3.

Inspection TCC pressure control solenoid valve
1) Inspection TCC pressure control solenoid valve referring

to “Solenoid Valves (Shift Solenoid-A, Shift Solenoid-B,
TCC Pressure Control Solenoid and Pressure Control
Solenoid Inspection”.

Is check results satisfactory?

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

Replace TCC pressure
control solenoid valve
referring to
“Transmission Fluid
Temperature Sensor
Removal and
Installation”.

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