P0756
DTC P0756 Shift Solenoid "B" Performance (Shift Solenoid Valve S2)SYSTEM DESCRIPTION
The ECM uses signals from the output shaft speed sensor and input speed sensor to detect the actual gear position (1st, 2nd, 3rd, 4th, 5th or 6th gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical problems of the shift solenoid valves, valve body or automatic transmission (clutch, brake or gear, etc.).
P0756:
HINT:
^ Gear positions in the event of a solenoid valve mechanical problem:
MONITOR DESCRIPTION
This DTC indicates "stuck ON malfunction" or "stuck OFF malfunction" of the shift solenoid valve S2. The ECM commands gear shifts by turning the shift solenoid valves "ON/OFF". When the gear position commanded by the ECM and the actual gear position are not the same, the ECM illuminates the MIL and stores the DTC.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
Part 1:
Part 2:
INSPECTION PROCEDURE
1. ACTIVE TEST
HINT:
Performing the ACTIVE TEST using the intelligent tester allows the relay, VSV, actuator and so on to operate without parts removal. Performing the ACTIVE TEST as the first step of troubleshooting is one method to shorten labor time.
It is possible to display the DATA LIST during the ACTIVE TEST.
(a) Warm up the engine.
(b) Turn the engine switch off.
(c) Connect the intelligent tester together with the CAN VIM (controller area network vehicle interface module) to the DLC3.
(d) Turn the engine switch on (IG) position.
(e) Turn on the tester.
(f) Select the item "DIAGNOSIS / OBD/MOBD / ECT / ACTIVE TEST / SHIFT".
(g) According to the display on the tester, read the "ACTIVE TEST".
HINT: While driving, the shift position can be forcibly changed with the intelligent tester. Comparing the shift position commanded by the ACTIVE TEST with the actual shift position enables you to confirm the problem.
HINT:
^ This test can be conducted when the vehicle speed is 50 km/h (31 mph) or less.
^ The 4th to 5th and 5th to 6th up-shiftings must be performed with the accelerator pedal released.
^ The 6th to 5th and 5th to 4th down-shiftings must be performed with the accelerator pedal released.
^ Do not operate the accelerator pedal for at least 2 seconds after shifting and do not shift successively.
^ The shift position commanded by the ECM is shown in the DATA LIST (SHIFT) display on the intelligent tester.
^ The shift solenoid valve S2 is turned on/off normally when the shift lever is in the D position:
Steps 1-3(Part 1):
Step 3(Part 2):
