Toyota Avalon Service & Repair Manual: Camshaft Position "A" Actuator Bank 1 General Electrical Failure (P001001)

Toyota Avalon Service & Repair Manual / Engine / A25a-fxs Engine Control / Sfi System / Camshaft Position "A" Actuator Bank 1 General Electrical Failure (P001001)

DESCRIPTION

The VVT-iE system adjusts the intake valve timing using a motor. Compared to conventional hydraulic VVT systems, the valve timing can be adjusted within a wider range and can be retarded more when starting the engine. As the VVT-iE system can operate at low engine speeds and when the engine is cold, lower emissions, increased engine power and fuel economy and enhanced startability have been achieved.

  • If the cam timing control motor with EDU assembly is stuck to the advanced side, the valve overlap will be long and affect the internal EGR. This may lead to poor combustion, rough idling or engine stall.
  • If the cam timing control motor with EDU assembly is stuck near the most retarded angle (Atkinson cycle), depending on the vehicle conditions, sufficient intake air may not be obtained, causing a lack of power.

Part and Terminal Name

Function

Cam timing control motor with EDU assembly

Through its electric motor, operates camshaft timing gear assembly. Internal driver detects and performs malfunction diagnosis of motor control, motor speed and rotation direction.

Camshaft timing gear assembly

Changes valve timing by rotating camshaft timing gear.

ECM

Outputs target speed and motor rotation direction in response to driving conditions.

VB1

Power supply (when power switch is on (IG), auxiliary battery voltage is 12 V or higher)

GND

Power supply ground

VTP

Inputs motor activation signal from ECM.

VTS

Outputs actual motor speed.

VTD

Outputs actual rotation direction.

VTM

Outputs malfunction diagnosis results as a duty ratio.

  • Open circuit in VTP and VTM
  • Normal
  • Internal malfunction in driver
  • Malfunction in motor rotation sensor of driver

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P001001

Camshaft Position "A" Actuator Bank 1 General Electrical Failure

One of the following conditions is met for 3 seconds or more (1 trip detection logic).

  • Cam timing control motor IC has overheated.
  • Open in cam timing control motor circuit.
  • Overcurrent is detected in cam timing control motor.
  • Cam timing control motor with EDU assembly
  • Camshaft timing gear assembly

Comes on

DTC stored

SAE Code: P0010

Symptoms and Fail-safe Operation During Cam Timing Control Motor Malfunction

Vehicle Condition

Fail-Safe

  • Engine difficult to start
  • Lack of power

The cam timing control motor with EDU assembly is operated to the most retarded position.

MONITOR DESCRIPTION

This DTC is output when an IC overheat malfunction or an overcurrent malfunction is detected in the cam timing control motor with EDU assembly. The cam timing control motor with EDU assembly is equipped with a self diagnostic function, which is used to output diagnosis signals (VTM) to the ECM. If the ECM receives a motor driver interior malfunction signal, the ECM will illuminate the MIL and store this DTC.

MONITOR STRATEGY

Related DTCs

P0010: Camshaft position actuator (motor drive VVT system) range check

Required Sensors/Components (Main)

Cam timing control motor with EDU assembly

Required Sensors/Components (Related)

-

Frequency of Operation

Continuous

Duration

3 seconds

MIL Operation

Immediate

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored

None

All of the following conditions are met

-

Auxiliary battery voltage

11 V or higher

Power switch

On (IG)

Engine speed

100 rpm or higher

TYPICAL MALFUNCTION THRESHOLDS

"Camshaft position actuator error" from motor drive VVT system control module

Received

CONFIRMATION DRIVING PATTERN

HINT:

  • After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

    Click here

  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

    Click here

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG).
  3. Turn the Techstream on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the power switch off and wait for at least 30 seconds.
  6. Turn the power switch on (IG).
  7. Turn the Techstream on.
  8. Put the engine in Inspection Mode (Maintenance Mode).

    Click here

  9. Start the engine and warm it up (until the engine coolant temperature 75°C (167°F) or higher) with all the accessories switched off [A].
  10. Idle the engine for 10 seconds or more [B].
  11. Enter the following menus: Powertrain / Engine / Trouble Codes [C].
  12. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  13. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  14. Input the DTC: P001001.
  15. Check the DTC judgment result.

    Techstream Display

    Description

    NORMAL

    • DTC judgment completed
    • System normal

    ABNORMAL

    • DTC judgment completed
    • System abnormal

    INCOMPLETE

    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    HINT:

    • If the judgment result is NORMAL, the system is normal.
    • If the judgment result is ABNORMAL, the system has a malfunction.
    • If the judgment result is INCOMPLETE, perform steps [A] through [C] again.
    • [A] to [C]: Normal judgment procedure.

      The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

    • When clearing the permanent DTCs, do not disconnect the cable from the auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

CAUTION / NOTICE / HINT

NOTICE:

  • Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the Freeze Frame Data and Vehicle Control History can be useful for troubleshooting.

    Click here

    (Select Powertrain in Health Check and then check the time stamp data.)

    Click here

  • If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.

    Click here

HINT:

Read Freeze Frame Data using the Techstream. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. 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.

PROCEDURE

1.

INSPECT CAMSHAFT TIMING GEAR ASSEMBLY

*1

Camshaft Timing Gear Assembly

*2

Eccentric Shaft

(a) Remove the cam timing control motor with EDU assembly.

Click here

(b) Check if the eccentric shaft of the camshaft timing gear assembly rotates smoothly.

NOTICE:

If the camshaft is at a position where a valve is about to open, the eccentric shaft may become difficult to rotate.

OK:

Rotates smoothly.

HINT:

Perform "Inspection After Repair" after replacing the camshaft timing gear assembly, or removing or replacing the cam timing control motor with EDU assembly.

Click here

OK

REPLACE CAM TIMING CONTROL MOTOR WITH EDU ASSEMBLY

NG

REPLACE CAMSHAFT TIMING GEAR ASSEMBLY

    Control Module Internal Temperature Sensor/Intake Air Temperature Sensor Signal Compare Failure (P111C62)

    Manifold Absolute Pressure / Barometric Pressure Sensor Signal Stuck in Range (P01052A)

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