P0756

DTC P0756 Shift Solenoid "B" Performance (Shift Solenoid Valve S2)

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, gear, etc.).





HINT: Gear positions in the event of a solenoid valve mechanical problem: shifted to 5th.





MONITOR DESCRIPTION
This DTC indicates a 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

Part 1:

Part 2:

TYPICAL ENABLING CONDITIONS

Part 1:

Part 2:

TYPICAL MALFUNCTION THRESHOLDS





INSPECTION PROCEDURE

1. ACTIVE TEST

HINT: Using the intelligent tester or Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests.

(a) Warm up the engine.
(b) Turn the ignition switch OFF.
(c) Connect the intelligent tester or Techstream to the DLC3.
(d) Turn the ignition switch ON and push the tester switch ON.
(e) Enter the following menus:
(1) Intelligent tester - Select: DIAGNOSIS / OBD/MOBD / ECT / ACTIVE TEST.
(2) Techstream - Select: Powertrain / Engine and ECT / Active Test.
(f) Follow the instructions on the tester and perform the Active Test.

HINT: While driving, the shift position can be forcibly changed with the intelligent tester or Techstream. Comparing the shift position commanded by the Active Test with the actual shift position enables you to confirm the problem.

(1) Intelligent tester

ECT:

(2) Techstream

ECT:

HINT:
^ This test can be conducted when the vehicle speed is 50 km/h (30 mph) or less.
^ The 4th to 5th and 5th to 6th up-shift must be performed with the accelerator pedal released.
^ The 6th to 5th and 5th to 4th down-shift 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 display on the tester.
^ The shift solenoid valve S2 turns ON/OFF normally when the shift lever is in the D position.

Step 1:

Step 2-3: