P0088 P1229

DTC    P0088    Fuel Rail / System Pressure - Too High

DTC    P1229    Fuel Pump System


 

DESCRIPTION

 

DTC No.DTC Detection ConditionTrouble Area
P0088Internal fuel pressure of common rail is too high:
Fuel pressure exceeds 200 MPa (2,039 kgf/cm2, 29,007 psi)
(1 trip detection logic)
  1. Supply pump (suction control valve)
  2. Common rail assembly (pressure discharge valve)
  3. Short in supply pump (suction control valve) circuit
  4. ECM
P1229Fuel over-feed:
Internal fuel pressure continues exceeding target fuel pressure despite ECM closing suction control valve
(1 trip detection logic)
  1. Short in supply pump (suction control valve) circuit
  2. Supply pump (suction control valve)
  3. ECM

HINT:

  1. DTC P0088 and P1229 can be detected if the vehicle is driven at 50 km/h (31 mph) for 5 minutes.
  2. For more information on the supply pump (suction control valve) and common rail system, refer to the system description.
  3. When DTC P0088 and/or P1229 is set, check the internal fuel pressure of the common rail by entering the following menus on the intelligent tester: Powertrain / Engine and ECT / Data List / Fuel Press.

 

Reference: 
Engine SpeedFuel Pressure
IdlingApproximately 37 to 43 MPa
3,000 rpm (No engine load)Approximately 60 to 66 MPa

 

MONITOR DESCRIPTION

  1. P0088 (Internal fuel pressure too high):
    The ECM sets this DTC if the fuel pressure inside the common rail is more than 200 MPa (2,039 kgf/cm2, 29,007 psi). This DTC indicates that: 1) the suction control valve may be stuck open or 2) there may be a short in the suction control valve circuit.
    If this DTC is set, the ECM enters fail-safe mode and limits the engine power. The fail-safe mode continues until the ignition switch is turned off.
  1. P1229 (Fuel over-feed):
    The ECM sets this DTC if the actual fuel pressure inside the common rail remains higher than the target fuel pressure, despite the ECM closing the suction control valve. This DTC indicates that the suction control valve may be stuck open, or there may be a short in its circuit. Under this condition, the pressure discharge valve operates frequently.
    If this DTC is set, the ECM enters fail-safe mode and limits the engine power. The fail-safe mode continues until the ignition switch is turned off.


 

MONITOR STRATEGY

 

P0088: 
Required sensorFuel pressure sensor
Frequency of operationContinuous
Duration1 second
MIL operation1 driving cycle

 

P1229: 
Required sensorFuel pressure sensor
Frequency of operationContinuous
Duration10 minutes
MIL operation1 driving cycle


 

TYPICAL ENABLING CONDITIONS

 

P0088: 
Specification
The monitor will not run if the fuel pressure sensor or suction control valve circuit is malfunctioning.

 

P1229: 
ItemSpecification
Target fuel pressure variationSmall
The monitor will not run if the fuel pressure sensor or suction control valve circuit is malfunctioning.


 

TYPICAL MALFUNCTION THRESHOLDS

 

P0088: 
Detection CriteriaThreshold
Fuel pressure sensor200 MPa (2,039 kgf/cm2, 29,007 psi) or more

 

P1229: 
Detection CriteriaThreshold
The internal fuel pressure of the common rail when the suction control valve is closed.Remains higher than target fuel pressure


 

WIRING DIAGRAM


ECD SYSTEM 2AD-FHV P0088 P1229 TOYOTA RAV4 / ACA30, 33, 38 ALA30



 

INSPECTION PROCEDURE

NOTICE:

 
  1. After replacing the ECM, the new ECM needs registration  and initialization.
  2. After replacing a supply pump, the ECM needs initialization.
1.CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0088 AND/OR P1229)
  1. Connect the intelligent tester to the DLC3.

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

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

  1. Read the DTCs.

     

    Result:
    Display (DTC Output)Proceed to
    P0088 and/or P1229A
    P0190, P0192 and/or P0193B
 B
GO TO DTC CHART
 
A 
 

 

2.INSPECT SUPPLY PUMP ASSEMBLY (SUCTION CONTROL VALVE)


 

ECD SYSTEM 2AD-FHV P0088 P1229 TOYOTA RAV4 / ACA30, 33, 38 ALA30
  1. Disconnect the B46 suction control valve connector.

  1. Measure the resistance of the suction control valve.

     

    Standard resistance:
    Tester ConnectionConditionSpecified Condition
    B46-1 - B46-220°C (68°F)1.9 to 2.3 Ω

     

     

  1. Reconnect the suction control valve connector.

 NG
REPLACE SUPPLY PUMP ASSEMBLY
 
OK 
 

 

3.CHECK IF DTC OUTPUT RECURS
  1. Connect the intelligent tester to the DLC3.

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

  1. Clear DTCs.

  1. Disconnect the suction control valve connector and then start the engine. Wait for 1 minute.

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

  1. Read the DTCs.

    Result:
    Display (DTC Output)Proceed to
    No output or engine does not startA
    P1229B
  1. Reconnect the suction control valve connector.

 B
REPLACE SUPPLY PUMP ASSEMBLY
 
A 
 

 

4.CHECK WIRE HARNESS (SCV - ECM)


 

ECD SYSTEM 2AD-FHV P0088 P1229 TOYOTA RAV4 / ACA30, 33, 38 ALA30
  1. Disconnect the B46 valve connector.

  1. Disconnect the B32 ECM connector.

  1. Measure the resistance of the wire harness side connectors.

     

    Standard resistance:
    Tester ConnectionSpecified Condition
    B46-1 - B32-42 (PCV+)Below 1 Ω
    B46-2 - B32-41 (PCV-)Below 1 Ω
    B46-1 or B32-42 (PCV+) - Body ground10 kΩ or higher
    B46-2 or B32-41 (PCV-) - Body ground10 kΩ or higher
  1. Reconnect the suction control valve connector.

  1. Reconnect the ECM connector.

 NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
 
OK 
 

 

5.REPLACE COMMON RAIL ASSEMBLY
  1. Replace the common rail assembly.

 

NEXT 
 

 

6.CHECK WHETHER DTC OUTPUT RECURS
  1. Connect the intelligent tester to the DLC3.

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

  1. Clear DTCs.

  1. Start the engine and drive the vehicle for approximately 15 minutes.

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

  1. Read the DTCs.

    Result:
    Display (DTC Output)Proceed to
    P0088 and/or P1229A
    No outputB
 B
SYSTEM IS OK
 
A 
 
REPLACE ECM