P0751

DTC P0751 Shift Solenoid "A" Performance (Shift Solenoid Valve S1)

DESCRIPTION
The ECM uses signals from the vehicle speed sensor and speed sensor NT to detect the actual gear position (1st, 2nd, 3rd or 4th).

Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect the mechanical problems of the shift solenoid valves, the valve body or automatic transaxle (clutch, brake or gear etc.).





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 shift solenoid valve S1.

The ECM controls the gearshifts by turning the shift solenoid valves ON/OFF. When the gear position directed by the ECM and the actual gear position do not match, 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 components, such as the relay, VSV, and actuator, to be operated without removing any parts. Performing the ACTIVE TEST as the first step of troubleshooting is one method of shortening labor time.
It is possible to display the DATA LIST during the ACTIVE TEST.

(a) Warm up the engine.
(b) Turn the ignition switch off.
(c) Connect the intelligent tester together with the CAN VIM (Controller Area Network Vehicle Interface Module) to the DLC3.
(d) Turn the ignition switch to the ON position.
(e) Turn on the tester.
(f) Select the following items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / SHIFT.
(g) In accordance with the display on the tester, perform the ACTIVE TEST. Scan Tool Testing and Procedures

HINT: While driving, the shift position can be forcibly changed using 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 30 mph (50 km/h) or less.
^ The 3rd to 4th up-shifting must be performed with the accelerator pedal released.
^ The 4th to 3rd down-shifting 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 more than once in succession.
^ The shift position directed by the ECM is shown in the DATA LIST / SHIFT display on the intelligent tester.
^ Shift solenoid valve S1 is turned on/off normally when the shift lever is in the D position:

Step 1:

Steps 2-3: