P0750
DTC P0750
GENERAL DESCRIPTION
The Automatic Transmission changes the gear position of the transmission utilizing a combination of Clutches and Brakes, which are controlled by solenoid valves. The New Alpha Automatic Transmission consists of a: LR (Low and Reverse Brake), KD (Kick Down Brake), FC (Front Clutch), RC (Rear Clutch), and EC (End Clutch). The gear position is determined by the combination of 3 kinds of Shift Control Solenoid Valves. (SCSV A , SCSV B, SCSV C).
DTC DESCRIPTION
The PCM checks the Shift Control Solenoid Valve A 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 PCM judges that SCSV A control solenoid circuit is malfunctioning and sets this code.
DTC DETECTING CONDITION:
SCHEMATIC DIAGRAM:
MONITOR SCANTOOL DATA
1. Connect Scantool to data link connector (DLC).
2. Engine "ON".
3. Measure voltage between terminal "2" of the sensor harness connector and chassis ground.
4. Select "N D RANGE".
Specification: "N" Range - OV, "D 1" Range - 12V.
5. Is "SCSV-A" within the specifications?
YES
^ Fault is intermittent caused by poor contact in the sensors and/or PCM's connector or was repaired and 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
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 "Signal circuit inspection" procedure.
SIGNAL CIRCUIT INSPECTION
1. Disconnect "A/T SOLENOID VALVE" connector.
2. IGNITION "ON", ENGINE "OFF".
3. Measure voltage between terminal "2" of the sensor harness connector and chassis ground.
Specification: approximately 12V
4. Is voltage within specifications?
YES
^ Go to "Component inspection" procedure.
NO
^ Check for open or short in harness. Repair as necessary and Go to "Verification of vehicle repair" procedure. L If signal circuit in harness is OK, Go to "Check PCM" of the "Component inspection" procedure
COMPONENT INSPECTION
1. CHECK SOLENOID VALVE
A. Ignition "OFF".
B. Disconnect "NT SOLENOID VALVE" connector.
C. Measure resistance between terminal "2" and chassis ground.
Specification: Approximately 22.3±1.5 Ohms [20°C (68°F)]
D. Is resistance within specification?
YES
^ Go to "CHECK PCM" as below.
NO
^ Replace SHIFT CONTROL SOLENOID VALVE-A as necessary and go to "Verification of vehicle repair" procedure.
2. CHECK PCM
A. Connect Scantool to data link connector (DLC).
B. Ignition "ON" & Engine "OFF".
C. Select A/T solenoid valve actuator test and operate actuator test.
D. Can you hear operating sound for "TCC SOLENOID VALVE" actuator testing function?
YES
^ Go to "Verification of vehicle repair" procedure.
NO
^ Replace 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 mph (0 km/h)
5. Throttle position sensor 1V
6. IDLE SWITCH ON
7. ENGINE RPM 0
VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Using a Scantool, clear DTC.
3. Operate the vehicle within DTC Enable conditions in general information.
4. Are any DTCs present?
YES
^ Go to the applicable troubleshooting procedure.
NO
^ System performing to specification at this time.