P0755

DTC P0755 SHIFT CONTROL SOLENOID VALVE B CIRCUIT MALFUNCTION

Component Location:

GENERAL DESCRIPTION
The Automatic transmission changes the gear position of the transmission by utilizing a combination of clutches and brakes, which are controlled by solenoid valves. This automatic transmission consists of a: LR (Low and Reverse Brake), 2ND (2nd Brake), UD (Under Drive Clutch), OD (Over Drive Clutch), REV (Reverse Clutch), and RED (Reduction Brake, only for 5 speed transmissions).
The UD Clutch is engaged in the 1st gear, 2nd gear and 3rd gear positions.

DTC DESCRIPTION
The TCM checks the Under Drive Clutch Control Signal by monitoring the feedback signal from the solenoid valve drive circuit. If an unexpected signal is monitored (for example, high voltage is detected when low voltage is expected, or low voltage is detected when high voltage is expected), the TCM judges that Under Drive control solenoid circuit is malfunctioning and sets this code.

DTC Detecting Condition:

SPECIFICATION
Refer to DTC P0743. P0743

MONITOR SCANTOOL DATA
1. Connect Scantool to data link connector(DLC).
2. Engine "ON".
3. Monitor the "UD SOL. VALVE" parameter on the Scantool.
4. Shift gear position "1st" gear to "4th" gear.





5. Does "UD SOLENOID DUTY" follow the reference data?

YES
^ Fault is intermittent caused by poor contact in the sensor's and/or TCM(PCM)'s connector or was repaired and TCM(PCM) memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration or damage. Repair or replace as necessary and go to "Verification of vehicle repair" procedure.

NO
^ Go to "Terminal & connector inspection" procedure.

TERMINAL & CONNECTOR INSPECTION
Refer to DTC P0743. P0743

POWER SUPPLY CIRCUIT INSPECTION
1. Disconnect "MT SOLENOID VALVE" connector.
2. Measure voltage between terminal "5" of the sensor harness connector and chassis ground.
3. Turn ignition switch OFF ON.

C307:

4. Is voltage within specifications?

YES
^ Go to "Signal circuit inspection" procedure.

NO
^ Check that A/T -20A fuse in engine room junction is installed or not blown.
^ Check for open in harness. Repair as necessary and go to "Verification of vehicle repair" procedure.

SIGNAL CIRCUIT INSPECTION
1. Check signal circuit open inspection
1) Ignition "OFF".
2) Disconnect "A/T SOLENOID VALVE" connector and "PCM/TCM" connector.
3) Measure resistance between terminal "3" of the ATM SOLENOID VALVE harness connector and terminal "48" of the PCM/TCM harness connector.

C307/C302:

4) Is resistance within specifications?

YES
^ Go to "Check signal circuit short inspection" procedure.

NO
^ Check for open in harness. Repair as necessary and go to "Verification of vehicle repair" procedure.

2. Check signal circuit short inspection
1) Ignition "OFF".
2) Disconnect "MT SOLENOID VALVE" connector and "PCM/TCM" connector.
3) Measure resistance between terminal "3" of the ATM SOLENOID VALVE harness and chassis ground.

C307:

4) Is resistance within specifications?

YES
^ Go to "Component inspection" procedure.

NO
^ Check for short to ground in harness. Repair as necessary and go to "Verification of vehicle repair" procedure.

COMPONENT INSPECTION
1. CHECK SOLENOID VALVE
1) Ignition "OFF".
2) Disconnect "A/T SOLENOID VALVE" connector.
3) Measure resistance between terminal "3" and terminal "5" of the ATM SOLENOID VALVE harness connector.

Specification: Approximately 2.7-3.4 Ohms [20°C(68°F)]

C307:

4) Is resistance within specification?

YES
^ Go to "CHECK PCM/TCM" as below.

NO
^ Replace UD SOLENOID VALVE as necessary and go to "Verification of vehicle repair" procedure.

2. CHECK PCM/TCM
1) Connect Scantool to data link connector(DLC).
2) Ignition "ON" & Engine "OFF".
3) Select ATM solenoid valve actuator test and operate actuator test.
4) Can you hear operating sound for UD SOLENOID VALVE actuator testing function?

YES
^ Go to "Verification of vehicle repair" procedure.

NO
^ Replace PCM/TCM as necessary and Go to "Verification of Vehicle Repair" procedure.

ACTUATOR TEST CONDITION
1. IG SWITCH ON
2. TRANSAXLE RANGE SWITCH is normal
3. P RANGE
4. Vehicle Speed 0mph(0km/h)
5. Throttle position sensor < 1V
6. IDLE SWITCH ON
7. ENGINE RPM 0

VERIFICATION OF VEHICLE REPAIR
Refer to DTC P0743. P0743