MVA 4 Speed - Automatic Transmission

DTC P0766

Circuit Description

The engine control module (ECM) uses signals from the vehicle speed sensor to detect gear position 1st, 2nd, 3rd or 4th (O/D).

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.).

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 of 1st, 2nd, 3rd or 4th (O/D). 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.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0766 Shift Solenoid "D" Performance (Shift Solenoid Valve S4)

Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

The gear position commanded by the ECM and the actual gear position are not the same.

Action Taken When the DTC Sets

* DTC P0766 is a type C DTC.
* The malfunction indicator lamp (MIL) illuminates the first time the diagnostic runs with the fault active.

Conditions for Clearing the MIL/DTC

The DTC will clear when conditions for setting the DTC have been repaired.