How To Clean Toyota Toyota 22250-20020 Two Sets Of Wires

DTC    P1271    Fuel Regulator Excursion Malfunction (EDU Drive)
DTC    P1272    Fuel Force per unit area Regulator Malfunction

для подготовки Нажмите здесь

DESCRIPTION

The ECM controls the internal fuel pressure level of the common track past opening and closing the pressure discharge valve. When sudden deceleration occurs, the internal fuel pressure will temporarily become higher than usual and combustion noise may result. Therefore, the ECM will open the valve temporarily to discharge the excess pressure inside the common runway. Also, the pressure discharge valve opens when the ignition switch is turned off to allow prompt belch of the common rail internal pressure.

УКАЗАНИЕ:

1. For more information on the pressure discharge valve and the common rail system, refer to the post-obit procedures (See page Нажмите здесь).
   
2. For more than data on the EDU, refer to the post-obit procedures (See page Нажмите здесь).
   
3. If P1271 and/or P1272 is present, refer to the DTC chart for the fuel system (See page Нажмите здесь).
   

DTC No.	DTC Detection Status	Trouble Area
P1271	Open or brusque in pressure discharge valve circuit. There is no valve opening confirmation (IJf) signal from EDU to ECM despite the ECM sending valve opening command (PRD) signal after the engine is started. (1-trip detection logic)	Open or short in pressure discharge valve circuit Open or short in pressure discharge valve itself EDU ECM
P1272	Pressure discharge valve airtight malfunction. Actual pressure decreasing rate deviates from the simulated pressure decreasing rate after the ignition switch is turned off. (2-trip detection logic)	Open or short in pressure discharge valve circuit (P1271 is set simultaneously) Pressure discharge valve Supply pump ECM

УКАЗАНИЕ:

1. After confirming DTC P1271 and/or P1272, cheque the fuel pressure within the common rail in the "Powertrain / Engine and ECT / Data List / Fuel Press" menu using the intelligent tester.
   
2. P1271:
   After clearing the DTC, drive the vehicle at 50 km/h (31 mph) with the third gear and so decelerate by releasing the accelerator pedal. Check that P1271 is not nowadays.
   
3. P1272:
   After clearing the DTC, start and finish the engine twice, and and so confirm that P1272 is not present.
   

Reference:

Engine Speed	Fuel Force per unit area (MPa)
Idling	Approximately 37 to 43
3000 rpm (No engine load)	Approximately 60 to 66

MONITOR Clarification

1. P1271 (Open or short in pressure level discharge valve circuit):
   This DTC will be gear up if there is no valve opening confirmation (IJf) signal sent from the EDU to the ECM, if the ECM has commanded the EDU to open the force per unit area discharge valve. This DTC refers to an open or short in the force per unit area discharge valve circuit, not a malfunction that includes a valve that is stuck open or closed.
   The EDU monitors the current supplied to the pressure belch valve to verify that the current flows into the valve. If the current exceeds the specified level, the EDU interprets this as the IJf signal is low. If this DTC is nowadays, the ECM enters the fail-safety style and limits engine ability. The fail-safe mode continues until the ignition switch is turned off.
   

   

   
   

1. P1272 (Closed malfunction of the force per unit area discharge valve):
   The force per unit area belch valve will open and discharge the internal fuel pressure from the common rail to the fuel tank when the ignition switch is turned off. In this event, the ECM compares the actual drib charge per unit of the internal fuel pressure and the target drib charge per unit. If the ECM judges that the actual drop charge per unit is smaller than the target, the ECM so judges that the valve is stuck airtight and sets this DTC. This DTC will be stored if the internal fuel force per unit area does not drop to the target after the ignition switch has been turned off.
   If this DTC is present, the ECM enters a neglect-safety mode and limits engine power. The neglect-safe manner continues until the ignition switch is turned off.
   

MONITOR STRATEGY

P1271:

Required sensors	EDU
Frequency of operation	Continuous
Duration	3 seconds
MIL operation	i driving cycle

P1272:

Required sensors	Fuel pressure sensor
Frequency of functioning	Once per driving cycle
Duration	one 2nd
MIL operation	two driving cycles

TYPICAL ENABLING Weather condition

P1271:

Specification

Drive the vehicle at l km/h (31 mph) in 3rd gear and then decelerate past completely releasing the accelerator pedal

P1272:

Particular	Specification
	Minimum	Maximum
Fuel pressure	30 MPa (306 kgf/cmii, 4351 psi)	-
Fuel temperature	0°C (32°F)	-
Battery voltage	11 V	-
The monitor will non run if the fuel pressure level sensor, pressure discharge valve circuit, or fuel temperature sensor is malfunctioning

TYPICAL MALFUNCTION THRESHOLDS

P1271:

Specification

There are no confirmation signals from the EDU, despite the ECM sending the command signals regularly during deceleration

P1272:

Specification

The internal pressure level stays beyond the specified level after the ignition switch was turned off

WIRING DIAGRAM

INSPECTION Procedure

ПРИМЕЧАНИЕ:

Afterwards replacing the ECM, the new ECM needs registration (see page Нажмите здесь) and initialization (see page Нажмите здесь).

УКАЗАНИЕ:

1. Subsequently completing repairs, ostend that P1271 and/or P1272 does non recur.
   
2. If P0200 and P1271 are present simultaneously, at that place is an open in the INJF wire harness betwixt the EDU and ECM, or there is an open in the wire harness for both injector and pressure discharge valve.
   

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch on (IG) and turn the tester on.
   

3. Enter the following menus: Powertrain / Engine and ECT / DTC.
   

4. Read DTCs.
   

   Result:

   Display (DTC Output)	Keep to
   Only P1271, P1271 and P1272	A
   P1272 only	B

B

A

2.Inspect PRESSURE DISCHARGE VALVE

1. Disconnect the B87 pressure discharge valve connector.
   

2. Measure the resistance of the terminals of the pressure belch valve.
   

   Standard resistance:

   Tester Connexion	Condition	Specified Status
   B87-i - B87-2	xx°C (68°F)	0.85 to 1.05 Ω

3. Reconnect the pressure level discharge valve connector.
   

NG

OK

3.Check WIRE HARNESS (EDU - Force per unit area Belch VALVE)

1. Disconnect the B85 EDU connector.
   

2. Disconnect the B87 pressure discharge valve connector.
   

3. Measure out the resistance of the wire harness side connectors.
   

   Standard resistance:

   Tester Connection	Specified Condition
   B85-3 (RLF+) - B87-2	Beneath one Ω
   B85-vi (RLF-) - B87-1	Below 1 Ω
   B85-iii (RLF+) or B87-2 - Trunk ground	x kΩ or higher
   B85-six (RLF-) or B87-ane - Body ground	x kΩ or college

4. Reconnect the EDU connector.
   

5. Reconnect the pressure discharge valve connector.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR (EDU - Pressure level Belch VALVE)

OK

4.Check HARNESS AND CONNECTOR (EDU - ECM)

1. Disconnect the B84 EDU connector.
   

2. Disconnect the B31 ECM connector.
   

3. Measure out the resistance of the wire harness side connectors.
   

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   B84-seven (PRD) - B31-52 (PRD)	Always	Below 1 Ω
   B84-7 (PRD) or B31-52 (PRD) - Body basis	Ever	x kΩ or higher

4. Reconnect the EDU connector.
   

5. Reconnect the ECM connector.
   

NG	REPAIR OR Supervene upon HARNESS OR CONNECTOR (EDU - ECM)

OK

5.CHECK EDU (Ability SOURCE CIRCUIT)

1. Disconnect the EDU connectors.
   

2. Turn the ignition switch on (IG).
   

3. Measure the voltage of the specified terminals of each EDU wire harness side connector.
   

   Standard voltage:

   Tester Connection	Condition	Specified Status
   B86-3 (+B) - B86-2 (GND)	Ignition switch on (IG)	9 to fourteen V

4. Reconnect the EDU connectors.
   

NG	CHECK EDU Power SOURCE Excursion (EDU - Bombardment)

OK

1. Supervene upon the EDU (See folio Нажмите здесь).
   

Adjacent

7.Bank check WHETHER DTC OUTPUT RECURS

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch on (IG) and turn the tester on.
   

3. Clear DTCs (See folio Нажмите здесь).
   

4. Start the engine and drive the vehicle for approximately fifteen minutes.
   

5. Enter the following menus: Powertrain / Engine and ECT / DTC.
   

6. Read the DTCs.
   

   Effect:

   Display (DTC Output)	Keep to
   P1271 and/or P1272	A
   No output	B

B

A

viii.Supervene upon Mutual RAIL ASSEMBLY

1. Supplant the common rails assembly (See page Нажмите здесь).
   

NEXT
CHECK IF DTC OUTPUT RECURS (DTC P1271 AND/OR P1272)

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