P0751

A750E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P0751: Shift Solenoid "A" Performance (Shift Solenoid Valve S1)
P0751 - Shift Solenoid "A" Performance (Shift Solenoid Valve S1)

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 or 5th 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.).





MONITOR DESCRIPTION

This DTC indicates stuck ON malfunction or stuck OFF malfunction of the 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

All





OFF malfunction (A)





OFF malfunction (B)





OFF malfunction (C)





ON malfunction (A)





ON malfunction (B)





ON malfunction (C)





ON malfunction (D)





ON malfunction (E)





TYPICAL MALFUNCTION THRESHOLDS

[OFF malfunction]

All of the following conditions are met: OFF malfunctions (A), (B) and (C)

2 detections are necessary in 1 driving cycle.

1st detection; temporary flag ON

2nd detection; pending fault code ON

OFF malfunction (A)





OFF malfunction (B)





OFF malfunction (C)





[ON malfunction]

Either of the following conditions is met:

- ON malfunctions (A) and (B)

- ON malfunction (B) or (C) and ON malfunction (D) or (E)

ON malfunction (A)





ON malfunction (B)





ON malfunction (C)





ON malfunction (D)





ON malfunction (E)





INSPECTION PROCEDURE

NOTICE:
Perform the universal trip to clear permanent DTCs Reading and Clearing Diagnostic Trouble Codes.

HINT
Performing the Active Test using a Techstream allows components, such as the relay, VSV, and actuator, to be operated without removing any parts. Performing the Active Test as a 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 Techstream to the DLC3.
(d) Turn the ignition switch to ON.
(e) Turn the Techstream on.
(f) Enter the following menus: Powertrain / Engine and ECT / Active Test.
(g) According to the display on the Techstream, perform the Active Test.

HINT
While driving, the shift position can be changed with the Techstream.

Comparing the shift position directed by the Active Test with the actual shift position enables the problem to be confirmed Fail-Safe Chart.

Engine and ECT





HINT
* This test can be conducted when the vehicle speed is 50 km/h (30 mph) or less.
* The 4th to 5th up-shifting must be performed with the accelerator pedal released.
* The 5th to 4th 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 successively.
* The shift position directed by the ECM is shown in the Data List / Shift Status display on the Techstream.
* The shift solenoid valve S1 is turned on/off normally when the shift lever is in the D position:






PROCEDURE

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0751)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

(e) Read the DTCs using the Techstream.

Result





HINT
If any codes besides P0751 are output, perform troubleshooting for those DTCs first.

B -- GO TO DTC CHART Automatic Transmission System - A750E
A -- Continue to next step.

2. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVE THE SOLENOID (SLT)) P0746

NG -- REPLACE SHIFT SOLENOID VALVE SLT Disassembly
OK -- Continue to next step.

3. INSPECT SHIFT SOLENOID VALVE S1

(a) Remove the shift solenoid valve S1.





(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





(c) Connect the positive (+) lead to the terminal of the solenoid connector, and the negative (-) lead to the solenoid body.

OK:

The solenoid makes operating sounds.

NG -- REPLACE SHIFT SOLENOID VALVE S1 Disassembly
OK -- Continue to next step.

4. INSPECT TRANSMISSION VALVE BODY ASSEMBLY P0746

NG -- REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY Removal

OK -- REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY Removal