P0750
DTC P0750 SHIFT CONTROL SOLENOID VALVE A CIRCUIT MALFUNCTIONCOMPONENT LOCATION
Refer to DTC P0741. P0741
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 (PCM) 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 (PCM) judges that the Low and Reverse control solenoid circuit is malfunctioning and sets this code.
DTC DETECTING CONDITION
DTC DETECTING CONDITION:
SPECIFICATION
Refer to DTC P0743. P0743
SCHEMATIC DIAGRAM
Refer to DTC P0741. P0741
MONITOR SCAN TOOL DATA
1. Connect SCAN TOOL to data link connector (DLC).
2. Engine ON.
3. Monitor the LR SOL. VALVE parameter on the SCAN TOOL.
4. Shift gear position 1st to 2nd.
Specification: 1st - 0%, 2nd - 100%
Specification:
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 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 A/T SOLENOID VALVE connector.
2. Measure voltage between terminal 6 of the sensor harness connector and chassis ground.
3. Turn ignition switch OFF - ON.
Specification: 12 V is measured only for approximately 0.5 sec
Specification:
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 11of the ATM SOLENOID VALVE harness connector and terminal 46 of the TCM (PCM) harness connector
Specification: approximately 0 Ohms
Specification:
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 A/T SOLENOID VALVE connector and TCM (PCM) connector.
3. Measure resistance between terminal > of the ATM SOLENOID VALVE harness and chassis ground.
Specification: Infinite
Specification:
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 11 and terminal 6 of the ATM SOLENOID VALVE harness connector.
Specification: Approximately 2.7 - 3.4 Ohms [20°C (68°F)]
Specification:
4. Is resistance within specification?
YES > Go to CHECK TCM (PCM).
NO > Replace LR SOLENOID VALVE as necessary and go to Verification of Vehicle Repair procedure.
2. CHECK TCM (PCM)
1. Connect SCAN TOOL 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 of Vehicle Repair procedure.
NO > Replace TCM (PCM) 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 0 km/h
5. Throttle position sensor < 1 V
6. IDLE SWITCH ON
7. ENGINE RPM 0
VERIFICATION OF VEHICLE REPAIR
Refer to DTC P0741. P0741