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

WARNING: This page is about a different car, the 2011 Toyota Matrix. However, it is still accessible from the selected car via links, so may be relevant.

CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0766)

Connect the Techstream to the DLC3.
Turn the ignition switch to ON and turn the Techstream main switch on.
Select the item "Powertrain / Engine and ECT / Trouble Codes".

Read the DTCs using the Techstream.

Result

Display (DTC output)	Proceed to
Only "P0766" is output	A
"P0766" and other DTCs	B

HINT:

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

B → See step 6

A: Go to next step

INSPECT SHIFT SOLENOID VALVE S4

Remove the shift solenoid valve S4.

Fig 1: Inspecting Shift Solenoid Valve S4
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard resistance

Tester Connection	Condition	Specified Condition
Solenoid Connector (S4) - Solenoid Body (S4)	20°C (68°F)	11 to 15 Ω

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 → See step 7

OK: Go to next step

INSPECT TRANSMISSION VALVE BODY ASSEMBLY
OK

There are no foreign objects on each valve.

NG → See step 8

OK: Go to next step
INSPECT TORQUE CONVERTER CLUTCH ASSEMBLY
OK

The torque converter clutch operates normally.

NG → REPLACE TORQUE CONVERTER CLUTCH ASSEMBLY

OK → See step 5
REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLY. Refer to REMOVAL
GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART
REPLACE SHIFT SOLENOID VALVE S4. Refer to DISASSEMBLY
REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY. Refer to REMOVAL