Inspection Procedure

HINT:

Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction (See FREEZE FRAME DATA ).

READ VALUE OF INTELLIGENT TESTER (FUEL PRESSURE)

Connect the intelligent tester to the DLC3.
Start the engine.
Turn the intelligent tester on.
Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / FUEL PRESS.

Read the values.

Pressure:

4 to 13 MPa (40.8 to 132.6 kgf/cm ² , 580 to 1,885 psi).

Result

RESULT REFERENCE

Fuel Pressure (MPa)	Proceed to
19.6 or more	A
0.0	B
OK (4 to 13 MPa (40.8 to 132.6 kgf/cm² , 580 to 1,885 psi)) *	C

HINT:

*: The value must be changed when the engine is running or stopped.

B: Go to step 3

C: CHECK FOR INTERMITTENT PROBLEMS

A: Go to next step

INSPECT FUEL PRESSURE SENSOR (VC VOLTAGE)

Disconnect the E37 fuel pressure sensor connector.
Turn the engine switch on (IG).

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

Standard Voltage

VOLTAGE SPECIFIED CONDITION

Tester Connection	Specified Condition
VC (E37-3) - E2 (E37-1)	4.5 to 5.5 V

Fig 1: Identifying E37 Fuel Pressure Sensor Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step 4

OK: Go to next step

INSPECT ECM (PR VOLTAGE)

Start the engine.

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

Standard voltage

VOLTAGE SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
PR (E6-29) - EPR (E6-30)	25°C (77°F)	1.8 to 2.3 V

Fig 2: Identifying E6 ECM Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

The fuel pressure in the delivery pipe is 4 to 13 MPa (40.8 to 132.6 kgf/cm² , 580 to 1,885 psi).

NG: Go to step 5

OK: REPLACE ECM

CHECK HARNESS AND CONNECTOR (ECM - FUEL PRESSURE SENSOR)

Disconnect the E6 ECM connector.
Disconnect the E37 fuel pressure sensor connector.

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

Standard resistance (Check for open)

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
VCPR (E6-31) - VC (E37-3)	Below 1 Ω
PR (E6-29) - PR (E37-2)	Below 1 Ω.
EPR(E6-30) - E2(E37-1)	Below 1 Ω

Standard resistance (Check for short)

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
VCPR (E6-31) or VC (E37-3) - Body ground	10 kΩ or higher
PR (E6-29) or PR (E37-2) - Body ground	10 kΩ or higher

Fig 3: Identifying Harness And Connector (ECM - Fuel Pressure Sensor)

Reconnect the ECM connector.
Reconnect the fuel pressure sensor connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE ECM

CHECK HARNESS AND CONNECTOR (ECM - FUEL PRESSURE SENSOR)

Disconnect the E37 fuel pressure sensor connector.
Disconnect the E6 ECM connector.

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

Standard resistance (Check for short)

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
PR (E6-29) or PR (E37-2) - Body ground	10 kΩ. or higher

Fig 4: Identifying Harness And Connector (ECM - Fuel Pressure Sensor)

Reconnect the ECM connector.
Reconnect the fuel pressure sensor connector

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE FUEL PRESSURE SENSOR