DTC P0942-96: Hydraulic Pressure Unit Component Internal Failure [11/2021 - 03/2023]: Procedure

CHECK ENGINE STOP AND START ECU (EGND TERMINAL WAVEFORM)

Drive the vehicle to warm up the engine and automatic transmission fluid.
HINT:

The oil pump with solenoid assembly may not operate properly if the automatic transmission fluid temperature is low. Make sure to warm up the automatic transmission fluid before performing the Active Test. (Automatic transmission fluid temperature: 25°C (77°F) or higher)
Turn the ignition switch to ON.
HINT:

Do not start the engine.

Connect an oscilloscope to terminals D40-8 (EGND) and A28-8 (GND1).

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Component with harness connected
(Engine Stop and Start ECU)

Enter the following menus: Powertrain / Stop and Start / Active Test / Electromagnetic Oil Pump.

Powertrain > Stop and Start > Active Test

Tester Display
Electromagnetic Oil Pump

Check the waveform while performing the Active Test.

Item	Condition
Tester Connection	D40-8 (EGND) - A28-8 (GND1)
Tool Setting	10 V/DIV., 20 ms./DIV.
Condition	Ignition switch ON (engine is stopped) Active Test "Electromagnetic Oil Pump" being performed

Standard

The waveform is similar to that shown in the illustration.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Result

Proceed to
OK
NG

Result:

REPLACE OIL PUMP WITH SOLENOID ASSEMBLY

for A25A-FKS: Refer to PROCEDURE - Step 4

for T24A-FTS: Refer to PROCEDURE - Step 4

Result:

See step 2

CLEAR DTC

Clear the DTCs.

Powertrain > Stop and Start > Clear DTCs

Result

Proceed to
NEXT

Result:

See step 3

CHECK DTC OUTPUT

Read the DTCs.

Powertrain > Stop and Start > Trouble Codes

Result

Result	Proceed to
DTC P0942-96 is output	A
DTC P0942-96 is not output	B

Result:

REPLACE ENGINE STOP AND START ECU. Refer to REMOVAL [11/2021 - ]

Result: