2003 SUZUKI GRAND VITARA solenoid

YH4
GRAND
VITARA
AUTOMATIC TRANSMISSION (4 A / T) 7B1-33
O / D cut
switchOFF ON
VoltageBattery
voltage0 V
DIAGNOSTIC FLOW TABLE A-2 (NO GEAR SHIFT TO O / D)
SYSTEM DESCRIPTION
PCM does not shift to O / D gear under any of the following conditions.

O / D cut switch: ON

4WD LOW switch: ON

Cruise control module: O / D OFF command signal is output (if equipped).

ECT: ECT < 30C (86F)
TROUBLESHOOTING
WARNING:

When performing a road test, select a place where there is no traffic or possibility of a traffic accident
and very careful during testing to avoid occurrence of an accident.

Road test should be carried out with 2 person, a driver and tester, on a level road.
STEPACTIONYESNO
1Was ªAUTOMATIC TRANSMISSION
DIAGNOSTIC FLOW TABLEº performed?Go to Step 2.Go to ªAUTOMATIC
TRANSMISSION
DIAGNOSTIC FLOW
TABLEº.
2ECT check:
(1) Warm up engine to normal operating
temperature.
(2) Check ECT using scan tool.
Is ECT more than 30C (86F)?Go to Step 3.Faulty ECT sensor,
its circuit or engine
cooling system.
If OK, substitute a known-
good PCM and recheck.
3Perform running test under the following
conditions and check voltage between
C51-1-2 (G16 / J20 engines) or C51-1-6 (H25
engine) terminal of PCM coupler and ground,
C51-1-1 terminal of PCM coupler and ground.

O / D cut switch OFF (ªO / D OFFº lamp OFF).

Normal mode in ªDº range.

Transfer ª2Hº position.

Cruise control is not operated (if equipped).

Drive vehicle with 4th gear condition
referring to ªGear shift diagramº in this
section.
Is each voltage about 0 V?Faulty shift solenoid
valve, its circuit or
transmission.ªGº wire or ªG / Rº wire
shorted to power circuit.
If OK, go to Step 4.
4O / D cut switch signal inspection:
(1) With ignition switch ON, check voltage
between E61-33 (G16 / J20 engines) or
E61-14 (H25 engine) terminal of PCM
coupler and ground.
Is the result as specified?Go to Step 5.Faulty O / D cut switch or
its circuit.
If OK, substitute a known-
good PCM and recheck.

YH4
GRAND
VITARA
7B1-46 AUTOMATIC TRANSMISSION (4 A / T)
DTC P0741 TCC (LOCK-UP) SOLENOID VALVE PERFORMANCE OR STUCK OFF
DTC DETECTING CONDITION AND TROUBLE AREA
DTC DETECTING CONDITIONTROUBLE AREA
While running in 2nd or 4th gear, D range, TCC control
of PCM does not agree with actual operation of trans-
mission TCC even though solenoid valve is electrically
in good condition.
(2 driving cycles detection logic)
TCC (lock-up) solenoid valve stuck

TCC control valve stuck

Valve body fluid passage clogged

TCC faulty
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 a tester, on a level road.
1) Connect scan tool to DLC with ignition switch OFF.
2) Clear DTC, pending DTC and freeze frame data in PCM memory by using scan tool and check fuel level meter
indication is 1/4 or more.
3) Start engine, warm it up to normal operating temperature and shift transfer lever to ª2Hº or ª4Hº range.
4) Increase vehicle speed with D range, and check that gear position changes from 1st to 2nd and keep driving
about 20 mph, 30 km/h in 2nd of ªDº range for 10 seconds. (Throttle valve should be not at idle position and
the opening should be kept constant in this step.)
5) Keep driving about 50 mph, 80 km/h in 4th of ªDº range for 10 seconds.
6) Release accelerator pedal, decrease vehicle speed and stop vehicle.
7) Check pending DTC and DTC by using scan tool.
TROUBLESHOOTING
STEPACTIONYESNO
1Was ªA / T DIAG. FLOW TABLEº performed?Go to Step 2.Go to ªA / T DIAG.
FLOW TABLEº.
2TCC solenoid valve operation check:
1) Check TCC solenoid valve operation referring to
ªSolenoid Valves Operation Checkº in this section.
Is it in good condition?Go to Step 3.Faulty TCC solenoid
valve.
3Valve body check:
1) Check valve body referring to ªUnit Repairº in this
section.
Is it in good condition?Faulty torque
converter.Faulty valve body.

YH4
GRAND
VITARA
G16/J20 Engines H25 Engine
G16/J20 Engines
H25 Engine
1. PCM
2. Shift solenoid-A
3. Shift solenoid-B
4. TCC solenoid
AUTOMATIC TRANSMISSION (4 A / T) 7B1-47
DTC P0743 (DTC NO.65 / 66) TCC (LOCK-UP) SOLENOID ELECTRICAL
WIRING DIAGRAM
DTC DETECTING CONDITION AND TROUBLE AREA
DTC DETECTING CONDITIONTROUBLE AREA
Voltage at terminal C51-1-8 for G16 / J20 (C51-1-2 for
H25) of PCM is high while TCC solenoid OFF is com-
manded or low while TCC solenoid ON is comman-
ded.
TCC (lock-up) solenoid valve

TCC (lock-up) solenoid valve circuit

PCM
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 a tester, on a level road.
1) Connect scan tool to DLC with ignition switch OFF, if available.
2) Clear DTC.
3) Start engine, warm it up to normal operating temperature and shift transfer lever to ª2Hº or ª4Hº range.
4) Shift selector lever in D range and keep it there for 10 seconds.
5) Increase vehicle speed to about 80 km / h (50 mph) in 4th gear and in D range.
6) Keep driving at above speed for 20 seconds.
7) Release accelerator pedal, decrease vehicle speed and stop vehicle.
8) Check DTC and / or pending DTC.

YH4
GRAND
VITARA
7B1-48 AUTOMATIC TRANSMISSION (4 A / T)
TROUBLESHOOTING
STEPACTIONYESNO
1Was ªA / T DIAG. FLOW TABLEº performed?Go to Step 2.Go to ªA / T DIAG.
FLOW TABLEº.
2Is the vehicle equipped with monitor connector?Go to Step 3.Go to Step 4.
3Is DTC NO.65?G to Step 4.Go to Step 6.
4Check TCC Solenoid Circuit for Open or Short.
1) Turn ignition switch OFF and disconnect PCM
connectors.
2) Check for proper connection to PCM at terminals
C51-1-8 for G16 / J20 (C51-1-2 for H25).
3) If OK, then measure resistance between terminal
C51-1-8 for G16 / J20 (C51-1-2 for H25) of
disconnected PCM connector and ground.
Is it 11 ± 15
at 20
C, 68
F?Go to Step 5.ªG / Yº circuit open or
shorted to ground.
If wire and
connections are OK,
replace malfunction
shift solenoid.
5Check TCC Solenoid Circuit for Short.
1) Turn ignition switch ON.
2) Measure voltage between terminal C51-1-8 for
G16 / J20 (C51-1-2 for H25) of disconnected PCM
connector and ground.
Is it about 0 V?Intermittent trouble or
faulty PCM.
Check for
ªIntermittent and
Poor Connectionº in
Section 0A.ªG / Yº circuit shorted
to power circuit.
6Check TCC Solenoid Circuit for Short.
1) Turn ignition switch OFF and disconnect PCM
connectors.
2) Check for proper connection to PCM at terminals
C51-1-8 for G16 / J20 (C51-1-2 for H25) or C51-1-1.
3) If OK, then measure resistance between terminal
C51-1-8 for G16 / J20 (C51-1-2 for H25) of
disconnected PCM connector and ground.
Is it 11 ± 15
at 20
C, 68
F?Intermittent trouble or
faulty PCM.
Check for
ªIntermittent and
Poor Connectionº in
Section 0A.ªG / Yº circuit shorted
to ground.
If wire and
connections are OK,
replace malfunction
shift solenoid.

YH4
GRAND
VITARA
AUTOMATIC TRANSMISSION (4 A / T) 7B1-49
DTC P0751 SHIFT SOLENOID VALVE-A (#1) PERFORMANCE OR STUCK OFF
DTC P0756 SHIFT SOLENOID VALVE-B (#2) PERFORMANCE OR STUCK OFF
DTC DETECTING CONDITION AND TROUBLE AREA
DTC DETECTING CONDITIONTROUBLE AREA
While running in D range, gear change control from
PCM to A / T does not agree with actual A / T gear posi-
tion even though solenoid valve is electrically in good
condition.
(A / T gear position is calculated based on engine
speed signal and vehicle speed sensor signal.)
(2 driving cycles detection logic)DTC P0751:

Shift solenoid valve-A stuck or leakage.

2-3 shift valve stuck.

Valve body fluid passage clogged.

Mechanical malfunction in transmission.
(Direct clutch malfunction)
DTC P0756:

Shift solenoid valve-B stuck or leakage.

1-2 shift valve stuck.

3-4 shift valve stuck.

Valve body fluid passage clogged.

Mechanical malfunction in transmission.
(2nd brake malfunction)
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 a tester, on a level road.
1) Connect scan tool to DLC with ignition switch OFF.
2) Clear DTC, pending DTC and freeze frame data in PCM memory by using scan tool and check fuel level meter
indication is 1 / 4 or more.
3) Start engine, warm it up to normal operating temperature and shift transfer lever to ª2Hº or ª4Hº range.
4) Increase vehicle speed with D range, and check that gear position changes from 1st to 2nd, 3rd and 4th in that
order as vehicle speed increases, referring to ªGear Shift Diagramº in this section.
5) Stop vehicle and check pending DTC and DTC by using scan tool.
TROUBLESHOOTING
STEPACTIONYESNO
1Was ªA / T DIAG. FLOW TABLEº performed?Go to Step 2.Go to ªA / T DIAG.
FLOW TABLEº.
2Shift solenoid valve-A or -B operation check:
1) Check shift solenoid valve-A or -B for operation
referring to ªSolenoid Valves Operation Checkº
section.
Is it in good condition?Go to Step 3.Faulty shift solenoid
valve-A or -B.
3Valve body check:
1) Check valve body and its passage referring to
ªUnit Repairº section.
Are they in good condition?Overhaul and repair
automatic transmis-
sion.Faulty valve body.

YH4
GRAND
VITARA
G16/J20 Engines H25 Engine
H25 Engine G16/J20 Engines
1. PCM
2. Shift solenoid-A
3. Shift solenoid-B
4. TCC solenoid
7B1-50 AUTOMATIC TRANSMISSION (4 A / T)
DTC P0753 (DTC NO.61 / 62) SHIFT SOLENOID-A (#1) ELECTRICAL
DTC P0758 (DTC NO.63 / 64) SHIFT SOLENOID-B (#2) ELECTRICAL
WIRING DIAGRAM
DTC DETECTING CONDITION AND TROUBLE AREA
DTC DETECTING CONDITIONTROUBLE AREA
DTC P0753:
Voltage detected at C51-1-2 for G16/J20 (C51-1-6 for
H25) terminal is specified voltage or lower when shift
solenoid valve-A is ON or specified voltage or higher
when it is OFF.
Shift solenoid valve-A

Shift solenoid valve-A circuit

PCM
DTC P0758:
Voltage detected at C51-1-1 terminal is specified volt-
age or lower when shift solenoid valve-B is ON or spe-
cified voltage or higher when it is OFF.
Shift solenoid valve-B

Shift solenoid valve-B circuit

PCM

YH4
GRAND
VITARA
AUTOMATIC TRANSMISSION (4 A / T) 7B1-51
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 a tester, on a level road.
1) Connect scan tool to DLC with ignition switch OFF, if available.
2) Clear DTC.
3) Start engine and shift transfer lever to ª2Hº or ª4Hº range.
4) Shift selector lever in D range and keep it for 10 seconds.
5) Drive vehicle about 30 km / h (20 mph) with 2nd gear in D range for 10 seconds.
6) Increase vehicle speed to about 80 km / h (50 mph) with 4th gear in D range and keep it for 10 seconds.
7) Release accelerator pedal, decrease vehicle speed and stop vehicle.
8) Check DTC and / or pending DTC.
TROUBLESHOOTING (DTC P0753 / P0758)
STEPACTIONYESNO
1Was ªA / T DIAG. FLOW TABLEº performed?Go to Step 2.Go to ªA / T DIAG.
FLOW TABLEº.
2Is the vehicle equipped with monitor connector?Go to Step 3.Go to Step 4.
3Is DTC NO.61 or 63?Go to Step 4.Go to Step 6.
4Check Shift Solenoid Circuit for Open or Short.
1) Turn ignition switch OFF and disconnect PCM
connectors.
2) Check for proper connection to PCM at terminals
C51-1-2 for G16 / J20 (C51-1-6 for H25) or C51-1-1.
3) If OK, then measure resistance between terminal
C51-1-2 for G16 / J20 (C51-1-6 for H25) or C51-1-1
of disconnected PCM connector and ground.
Is it 11 ± 15
at 20C, 68F?Go to Step 5.ªGº or ªG / Rº circuit
open or shorted to
ground.
If wire and
connections are OK,
replace malfunction
shift solenoid.
5Check Shift Solenoid Circuit for Short.
1) Turn ignition switch ON.
2) Measure voltage between terminal C51-1-2 for
G16 / J20 (C51-1-6 for H25) or C51-1-1 of
disconnected PCM connector and ground.
Is it about 0 V?Intermittent trouble or
faulty PCM.
Check for
ªIntermittent and
Poor Connectionº in
Section 0A.ªGº or ªG / Rº circuit
shorted to power
circuit.
6Check Shift Solenoid Circuit for Short.
1) Turn ignition switch OFF and disconnect PCM
connectors.
2) Check for proper connection to PCM at terminals
C51-1-2 for G16 / J20 (C51-1-6 for H25) or C51-1-1.
3) If OK, then measure resistance between terminal
C51-1-2 for G16/J20 (C51-1-6 for H25) or C51-1-1
of disconnected PCM connector and ground.
Is it 11 ± 15
at 20C, 68F?Intermittent trouble or
faulty PCM.
Check for
ªIntermittent and
Poor Connectionº in
Section 0A.ªGº or ªG / Rº circuit
shorted to ground.

YH4
GRAND
VITARA
7B1-56 AUTOMATIC TRANSMISSION (4 A / T)
8) Stall speed should be within the following specification.
Stall speed: 2,100 ± 2,400 r / min. for G16 engine
2,300 ± 2,600 r / min. for J20 engine
2,300 ± 2,600 r / min. for H25 engine
Check result
Possible cause
Lower than standard
level
Faulty engine output

Defective torque converter
Higher than standard
level in ªDº range
Slippery O/D clutch

Slippery forward clutch

Malfunctioning O/D one-way clutch

Malfunctioning one-way clutch No. 2

Low line pressure
Higher than standard
level in ªRº range
Slippery direct clutch

Slippery reverse brake

Low fluid pressure

Slippery O/D clutch

Defective O/D one-way clutch
ROAD TEST
This test is to check if upshift and downshift take place at specified
speed while actually driving vehicle on a level road.
WARNING:

Carry out test in very little traffic area to prevent an acci-
dent.

Test requires 2 persons, a driver and a tester.
1) Warm up engine.
2) With engine running at idle, shift select lever ªDº.
3) Accelerate vehicle speed by depressing accelerator pedal grad-
ually.
4) While driving in ªDº range, check if gear shift occurs properly as
shown in Gear Shift Diagram in this section.
Test result
Possible cause
When 1
2 upshift fails to
occur1±2 shift valve stuck
When 2
3 upshift fails to
occur2±3 shift valve stuck
When 3
O/D upshift
fails to occur3±4 shift valve stuck
When gear shift point is in-
correct
Maladjusted throttle cable

Defective shift solenoid valve
-A or -B

1±2, 2±3 or 3±4 shift valve not
operating properly