Suzuki Grand Vitara JB416 / JB420 / JB419. Service manual - part 312

5A-39 Automatic Transmission/Transaxle: 

Poor 3 

→

 2 shift

Shift solenoid valve No.1 circuit faulty

Inspect circuit for open, short and intermittent. 
If NG, repair.

Output shaft speed sensor circuit faulty Inspect circuit for open, short and intermittent. 

If NG, repair.

CAN communication circuit faulty

Inspect circuit for open, short and intermittent. 
If NG, repair.

Accelerator pedal position sensor circuit 
faulty

Inspect circuit for open, short and intermittent 
referring to “DTC P0122: Throttle Position 
Sensor (Main) Circuit Low: For Petrol Engine 
Model in Section 1A”, “DTC P0123: Throttle 
Position Sensor (Main) Circuit High: For Petrol 
Engine Model in Section 1A”, “DTC P0222: 
Throttle Position Sensor (Sub) Circuit Low: For 
Petrol Engine Model in Section 1A” and “DTC 
P0223: Throttle Position Sensor (Sub) Circuit 
High: For Petrol Engine Model in Section 1A”.

TCM

Substitute a known-good TCM and recheck.

ECM

Substitute a known-good ECM and recheck.

Poor 2 

→

 1 shift

Shift solenoid valve No.2 circuit faulty

Inspect circuit for open, short and intermittent. 
If NG, repair.

Output shaft speed sensor circuit faulty Inspect circuit for open, short and intermittent. 

If NG, repair.

CAN communication circuit faulty

Inspect circuit for open, short and intermittent. 
If NG, repair.

Accelerator pedal position sensor circuit 
faulty

Inspect circuit for open, short and intermittent 
referring to “DTC P0122: Throttle Position 
Sensor (Main) Circuit Low: For Petrol Engine 
Model in Section 1A”, “DTC P0123: Throttle 
Position Sensor (Main) Circuit High: For Petrol 
Engine Model in Section 1A”, “DTC P0222: 
Throttle Position Sensor (Sub) Circuit Low: For 
Petrol Engine Model in Section 1A” and “DTC 
P0223: Throttle Position Sensor (Sub) Circuit 
High: For Petrol Engine Model in Section 1A”.

TCM

Substitute a known-good TCM and recheck.

ECM

Substitute a known-good ECM and recheck.

Incorrect gear shift point Output shaft speed sensor circuit faulty Inspect circuit for open, short and intermittent. 

If NG, repair.

Pressure control solenoid valve circuit 
faulty

Inspect circuit for open, short and intermittent. 
If NG, repair.

CANcommunication circuit faulty

Inspect circuit for open, short and intermittent. 
If NG, repair.

Accelerator pedal position sensor circuit 
faulty

Inspect circuit for open, short and intermittent 
referring to “DTC P0122: Throttle Position 
Sensor (Main) Circuit Low: For Petrol Engine 
Model in Section 1A”, “DTC P0123: Throttle 
Position Sensor (Main) Circuit High: For Petrol 
Engine Model in Section 1A”, “DTC P0222: 
Throttle Position Sensor (Sub) Circuit Low: For 
Petrol Engine Model in Section 1A” and “DTC 
P0223: Throttle Position Sensor (Sub) Circuit 
High: For Petrol Engine Model in Section 1A”.

TCM

Substitute a known-good TCM and recheck.

ECM

Substitute a known-good ECM and recheck.

Condition

Possible cause

Correction / Reference Item

Automatic Transmission/Transaxle:  5A-40

Non operate TCC / lock-up 
system

Lock-up control solenoid valve circuit 
faulty

Inspect circuit for open, short and intermittent. 
If NG, repair.

Shift solenoid valve No.1 and/or No.2 
circuit faulty

Inspect circuit for open, short and intermittent. 
If NG, repair.

Pressure control solenoid valve cicuit 
faulty

Inspect circuit for open, short and intermittent. 
If NG, repair.

Output shaft speed sensor circuit faulty Inspect circuit for open, short and intermittent. 

If NG, repair.

Input shaft speed sensor circuit faulty

Inspect circuit for open, short and intermittent. 
If NG, repair.

Transmission range sensor circuit faulty Inspect circuit for open, short and intermittent. 

If NG, repair.

Transmission fluid temperature sensor 
circuit faulty

Inspect circuit for open, short and intermittent. 
If NG, repair.

CAN communication circuit faulty

Inspect circuit for open, short and intermittent. 
If NG, repair.

Crankshaft position sensor circuit faulty Inspect circuit for opnen, short and intermittent 

referring to “DTC P0335: Crankshaft Position 
(CKP) Sensor Circuit (For M16 Engine): For 
Petrol Engine Model in Section 1A”.

Brake light switch circuit faulty

Refer to “No Lock-Up Occurs”.

Accelerator pedal position sensor circuit 
faulty

Inspect circuit for open, short and intermittent 
referring to “DTC P0122: Throttle Position 
Sensor (Main) Circuit Low: For Petrol Engine 
Model in Section 1A”, “DTC P0123: Throttle 
Position Sensor (Main) Circuit High: For Petrol 
Engine Model in Section 1A”, “DTC P0222: 
Throttle Position Sensor (Sub) Circuit Low: For 
Petrol Engine Model in Section 1A” and “DTC 
P0223: Throttle Position Sensor (Sub) Circuit 
High: For Petrol Engine Model in Section 1A”.

TCM

Substitute a known-good TCM and recheck.

ECM

Substitute a known-good ECM and recheck.

Higher or lower stall 
speed

Pressure control solenoid valve circuit 
faulty

Inspect circuit for open, short and intermittent. 
If NG, repair.

TCM

Substitute a known-good TCM and recheck.

Excessive “N” 

→

 “D” or 

“N” 

→

 “R” time lag

Pressure control solenoid valve circuit 
faulty

Inspect circuit for open, short and intermittent. 
If NG, repair.

TCM

Substitute a known-good TCM and recheck.

Higher or lower line 
pressure

Pressure control solenoid valve circuit 
faulty

Inspect circuit for open, short and intermittent. 
If NG, repair.

TCM

Substitute a known-good TCM and recheck.

Excessive slippage in all 
range

Pressure control solenoid valve circuit 
faulty

Inspect circuit for open, short and intermittent. 
If NG, repair.

TCM

Substitute a known-good TCM and recheck.

Condition

Possible cause

Correction / Reference Item

5A-41 Automatic Transmission/Transaxle: 

Trouble Diagnosis 2
On-vehicle repair

Condition

Possible cause

Correction / Reference Item

Unable to run in all range Faulty valve body component

Replace valve body assembly.

Excessive shift shock

Engine abnormal condition

Inspect and repair engine.

Malfunction of shift solenoid valve No.1 
and/or No.2

Inspect. If NG, replace.

Malfunction of output shaft speed 
sensor

Inspect. If NG, replace.

Malfunction of input shaft speed sensor Inspect. If NG, replace.
Malfunction of transmission range 
sensor

Inspect. If NG, replace.

Malfunction of Transmission fluid 
temperature sensor

Inspect. If NG, replace.

Malfunction of pressure control solenoid 
valve

Inspect. If NG, replace valve body assembly.

Malfunction of brake light switch except 
N 

→ D or N → R shifting

Inspect referring to “Brake Light Switch 
Inspection in Section 9B”. If NG, replace.

Malfunction of accelerator pedal position 
sensor

Inspect referring to “DTC P0122: Throttle 
Position Sensor (Main) Circuit Low: For Petrol 
Engine Model in Section 1A”, “DTC P0123: 
Throttle Position Sensor (Main) Circuit High: 
For Petrol Engine Model in Section 1A”, “DTC 
P0222: Throttle Position Sensor (Sub) Circuit 
Low: For Petrol Engine Model in Section 1A” 
and “DTC P0223: Throttle Position Sensor 
(Sub) Circuit High: For Petrol Engine Model in 
Section 1A”.

Faulty valve body component

Replace valve body assembly.

Poor 1 

→

 2 shift

Malfunction of shift solenoid valve No.2 Inspect. If NG, replace.
Malfunction of output shaft speed 
sensor

Inspect. If NG, replace.

Malfunction of transmission range 
sensor

Inspect. If NG, replace.

Malfunction of accelerator pedal position 
sensor

Inspect referring to “DTC P0122: Throttle 
Position Sensor (Main) Circuit Low: For Petrol 
Engine Model in Section 1A”, “DTC P0123: 
Throttle Position Sensor (Main) Circuit High: 
For Petrol Engine Model in Section 1A”, “DTC 
P0222: Throttle Position Sensor (Sub) Circuit 
Low: For Petrol Engine Model in Section 1A” 
and “DTC P0223: Throttle Position Sensor 
(Sub) Circuit High: For Petrol Engine Model in 
Section 1A”.

Faulty valve body component

Replace valve body assembly.

Automatic Transmission/Transaxle:  5A-42

Poor 2 

→

 3 shift

Malfunction of shift solenoid valve No.1 Inspect. If NG, replace.
Malfunction of output shaft speed 
sensor

Inspect. If NG, replace.

Malfunction of transmission range 
sensor

Inspect. If NG, replace.

Malfunction of accelerator pedal position 
sensor

Inspect referring to “DTC P0122: Throttle 
Position Sensor (Main) Circuit Low: For Petrol 
Engine Model in Section 1A”, “DTC P0123: 
Throttle Position Sensor (Main) Circuit High: 
For Petrol Engine Model in Section 1A”, “DTC 
P0222: Throttle Position Sensor (Sub) Circuit 
Low: For Petrol Engine Model in Section 1A” 
and “DTC P0223: Throttle Position Sensor 
(Sub) Circuit High: For Petrol Engine Model in 
Section 1A”.

Faulty valve body component

Replace valve body assembly.

Poor 3 

→

 O/D shift

Malfunction of shift solenoid valve No.2 Inspect. If NG, replace.
Malfunction of output shaft speed 
sensor

Inspect. If NG, replace.

Malfunction of transmission range 
sensor

Inspect. If NG, replace.

Malfunction of “3” position switch

Inspect. If NG, replace.

Malfunction of accelerator pedal position 
sensor

Inspect referring to “DTC P0122: Throttle 
Position Sensor (Main) Circuit Low: For Petrol 
Engine Model in Section 1A”, “DTC P0123: 
Throttle Position Sensor (Main) Circuit High: 
For Petrol Engine Model in Section 1A”, “DTC 
P0222: Throttle Position Sensor (Sub) Circuit 
Low: For Petrol Engine Model in Section 1A” 
and “DTC P0223: Throttle Position Sensor 
(Sub) Circuit High: For Petrol Engine Model in 
Section 1A”.

Malfunction of pressure control solenoid 
valve

Inspect. If NG, replace valve body assembly.

Faulty valve body component

Replace valve body assembly.

Poor O/D 

→

 3 shift

Malfunction of shift solenoid valve No.2 Inspect. If NG, replace.
Malfunction of output shaft speed 
sensor

Inspect. If NG, replace.

Malfunction of “3” position switch

Inspect. If NG, replace.

Malfunction of accelerator pedal position 
sensor

Inspect referring to “DTC P0122: Throttle 
Position Sensor (Main) Circuit Low: For Petrol 
Engine Model in Section 1A”, “DTC P0123: 
Throttle Position Sensor (Main) Circuit High: 
For Petrol Engine Model in Section 1A”, “DTC 
P0222: Throttle Position Sensor (Sub) Circuit 
Low: For Petrol Engine Model in Section 1A” 
and “DTC P0223: Throttle Position Sensor 
(Sub) Circuit High: For Petrol Engine Model in 
Section 1A”.

Malfunction of pressure control solenoid 
valve

Inspect. If NG, replace valve body assembly.

Faulty valve body component

Replace valve body assembly.

Condition

Possible cause

Correction / Reference Item