P0766

U151E AUTOMATIC TRANSAXLE: AUTOMATIC TRANSAXLE SYSTEM: P0766: Shift Solenoid "D" Performance (Shift Solenoid Valve S4)
P0766 - Shift Solenoid "D" Performance (Shift Solenoid Valve S4)

SYSTEM DESCRIPTION

The ECM uses signals from the vehicle 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 transaxle (clutch, brake or gear etc.).





MONITOR DESCRIPTION

The ECM commands gear shifts by turning the shift solenoid valves "ON/OFF". According to the input shaft revolution, intermediate (counter) shaft revolution and output shaft revolution, the ECM detects the actual gear position (1st, 2nd, 3rd, 4th or 5th gear position). 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

All





OFF malfunction (A)





OFF malfunction (B)





ON malfunction (A)





ON malfunction (B)





TYPICAL MALFUNCTION THRESHOLDS

Either of the following conditions is met: OFF malfunction (A) and (B), or ON malfunction (A) and (B)

* 2 detections are necessary per driving cycle:

1st detection; temporary flag ON

2nd detection; pending fault code ON

OFF malfunction (A)





OFF malfunction (B)





ON malfunction (A)





ON malfunction (B)





INSPECTION PROCEDURE

HINT
Using Techstream to perform Active Test 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 Test early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Test.

1. PERFORM ACTIVE TEST

(a) Warm up the engine.

(b) Turn the ignition switch off.

(c) Connect Techstream to the DLC3.

(d) Turn the ignition switch to the ON position.

(e) Turn on the tester.

(f) Select the item "Powertrain / Engine and ECT / Active Test".

(g) According to the display on the tester, perform the "Active Test".

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

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 shift position commanded by the ECM is shown in the Data List/Shift Status display on Techstream.

PROCEDURE

1. CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0766)

(a) Connect Techstream to the DLC3.

(b) Turn the ignition switch to the ON position and turn the Techstream main switch ON.

(c) Select the item "Powertrain / Engine and ECT / Trouble Codes".

(d) Read the DTCs using Techstream.

Result:





HINT
If any other codes besides "P0766" are output, perform the troubleshooting for those DTCs first.

B -- GO TO DTC CHART
A -- Continue to next step.

2. INSPECT SHIFT SOLENOID VALVE S4

(a) Remove the shift solenoid valve S4.





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

Standard resistance:





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

OK:

The solenoid makes an operating sound.

NG -- REPLACE SHIFT SOLENOID VALVE S4
OK -- Continue to next step.

3. INSPECT TRANSMISSION VALVE BODY ASSEMBLY

OK:

There are no foreign objects on each valve and they operate smoothly.

NG -- REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY
OK -- Continue to next step.

4. INSPECT TORQUE CONVERTER CLUTCH ASSEMBLY

OK:

The torque converter clutch operates normally.

NG -- REPLACE TORQUE CONVERTER CLUTCH ASSEMBLY

OK -- REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLY