Inspection Procedure

HINT:

If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

CHECK POWER STEERING OIL PRESSURE SENSOR

Connect the intelligent tester to the DLC3.
Turn the ignition switch ON and turn the tester ON.
Start the engine.
Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / PS SIGNAL.

Read the value displayed on the tester.

OK: Go to Next Step

POWER STEERING OIL PRESSURE SENSOR CONDITION

Condition	Power steering oil pressure sensor
Steering wheel locked	ON
Engine is idling	OFF

OK: CHECK FOR INTERMITTENT PROBLEMS

NG: Go to Next Step

CHECK HARNESS AND CONNECTOR (ECM - POWER STEERING OIL PRESSURE SENSOR)

Disconnect the E5 and E6 ECM connectors.

Fig 1: Disconnecting E5 And E6 ECM Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the P1 power steering oil pressure sensor connector.

Measure the resistance of the wire harness side connectors.

Standard resistance (Check for open)

TESTER CONNECTION - SPECIFIED CONDITIONS

Fig 2: Measuring Resistance Of Wire Harness Side Connectors

Standard resistance (Check for short)

TESTER CONNECTION - SPECIFIED CONDITIONS

Tester Connection	Specified Condition
DUTY (P1-2) or PSP (E6-32) - Body ground	10 kΩ or higher
E2 (P1-1) or E2 (E5-28) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE POWER STEERING OIL PRESSURE SENSOR