P0750

DTC P0750 SHIFT CONTROL SOLENOID VALVE A 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. The HIVEC 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 a RED (Reduction Brake, only for 5 speed transmissions). The LR Brake is engaged in the 1st gear and reverse gear positions.

DTC DESCRIPTION
The TCM checks the Low and Reverse 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 the Low and Reverse control solenoid circuit is malfunctioning and sets this code.

DTC DETECTING CONDITION





[2.0L]





[2.7L]

SPECIFICATION
Solenoid Valve for Pressure Control
^ Sensor type: Normal open 3-way
^ Operating temperature: -22 - 266°F (-30°C - 130°C)
^ Frequency:
- LR, 2ND, UD, OD, RED: 61.27 Hz (at the ATF temp. -20°C above)
- DCC: 30.64 Hz
^ Internal resistance: 2.7 - 3.4 Ohms (68°F or 20°C)
^ Surge voltage: 56 V

MONITOR SCANTOOL DATA
1. Connect scantool to data link connector (DLC).
2. Engine "ON".
3. Monitor the "LR SOL. VALVE" parameter on the scantool.





4. Shift gear position 1st to 2nd.
Specification: 1st -> 0%, 2nd -> 100%
5. Does "LR 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 Vehicle Repair" procedure.
NO >>
^ Go to "Terminal & Connector Inspection" procedure.

TERMINAL & CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?
YES >>
^ Repair as necessary and then go to "Verification of Vehicle Repair" procedure.
NO >>
^ Go to "Power Supply Circuit Inspection" procedure.

POWER SUPPLY CIRCUIT INSPECTION
1. Disconnect "A/T SOLENOID VALVE" connector.
2. Measure voltage between terminal "10" of the sensor harness connector and chassis ground.





3. Turn ignition switch OFF -> ON.
Specification: 12V is measured only for approximately 0.5 sec
4. Is voltage within specifications?
YES >>
^ Go to "Signal circuit inspection" procedure.
NO >>
^ Check that A/T-30A Fuse in engine room junction is installed or not blown.
^ Check for open in harness. Repair as necessary and Go to "Verification 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 "6" of the ATM SOLENOID VALVE harness connector and terminal "12" of the PCM/TCM harness connector
Specification: approximately 0 Ohms
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 Vehicle Repair" procedure.
2. Check signal circuit short inspection
1. Ignition "OFF".
2. Disconnect "A/T SOLENOID VALVE" connector and "PCM/TCM" connector.





3. Measure resistance between terminal "6" of the ATM SOLENOID VALVE harness and chassis ground.
Specification: Infinite
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 Vehicle Repair" procedure.

COMPONENT INSPECTION
1. CHECK SOLENOID VALVE
1. Ignition "OFF".
2. Disconnect "A/T SOLENOID VALVE" connector.





3. Measure resistance between terminal "6" and terminal "10" of the ATM SOLENOID VALVE component.
Specification: Approximately 2.7 - 3.4 Ohms (20°C)
4. Is resistance within specification?
YES >>
^ Go to "CHECK PCM/TCM" as below.
NO >>
^ Replace LR SOLENOID VALVE as necessary and go to "Verification Vehicle Repair" procedure.
2. CHECK PCM/TCM
1. Connect scantool to data link connector (DLC).
2. Ignition "ON" & Engine "OFF".
3. Select A/T Solenoid valve Actuator test and Operate Actuator test.
4. Can you hear operating sound for LR SOLENOID VALVE Actuator Testing Function?
YES >>
^ Go to "Verification Vehicle Repair" procedure.
NO >>
^ Replace PCM/TCM as necessary and Go to "Verification Vehicle Repair" procedure.

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

VERIFICATION OF VEHICLE REPAIR
Refer to DTC P0560. P0560