Lexus IS250 IS220d GSE20 ALE20 4GR-FSE ENGINE CONTROL SYSTEM
CHECK CONNECTION BETWEEN INTELLIGENT TESTER AND ECM
CHECK THROTTLE BODY ASSEMBLY (CHECK MIL ILLUMINATED)
CHECK ACCELERATOR PEDAL ASSEMBLY (CHECK MIL ILLUMINATED)
CHECK VVT SENSOR FOR INTAKE CAMSHAFT BANK 1 (CHECK MIL ILLUMINATED)
CHECK VVT SENSOR FOR EXHAUST CAMSHAFT BANK 1 (CHECK MIL ILLUMINATED)
CHECK VVT SENSOR FOR INTAKE CAMSHAFT BANK 2 (CHECK MIL ILLUMINATED)
CHECK VVT SENSOR FOR EXHAUST CAMSHAFT BANK 2 (CHECK MIL ILLUMINATED)
CHECK FUEL PRESSURE SENSOR (CHECK MIL ILLUMINATED)
CHECK BATTERY CURRENT SENSOR ASSEMBLY (CHECK MIL ILLUMINATED)
SFI SYSTEM - VC Output Circuit
DESCRIPTION
The ECM constantly generates 5 V power from the battery voltages supplied to the +B (BATT) terminal to operate the microprocessor. THe ECM also provides this power to the sensors through the VC output circuit.
When the VC circuit is short-circuited, the microprocessor in the ECM and sensors that are supplied power through the VC circuit are inactivated because the power is not supplied from the VC circuit. Under this condition, the system does not start up and the MIL does not illuminate even if the system malfunctions.
- HINT:
- Under normal conditions, the MIL is illuminated for several seconds when the ignition switch is first turned to ON. The MIL goes off when the engine is started.
WIRING DIAGRAM
Refer to ECM Power Source Circuit .
INSPECTION PROCEDURE
| 1.CHECK MIL |
Check that Malfunction Indicator Lamp (MIL) lights up when turning the engine switch on (IG).
- OK:
- MIL lights up.
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| NG | |
| 2.CHECK CONNECTION BETWEEN INTELLIGENT TESTER AND ECM |
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG) and tester ON.
Check the communication between the tester and ECM.
- Result:
Result Proceed to Communication is possible A Communication is not possible B
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| B | |
| 3.CHECK THROTTLE BODY ASSEMBLY (CHECK MIL ILLUMINATED) |
Disconnect the throttle body connector.
Turn the engine switch on (IG).
Check the MIL.
- Result:
Result Proceed to MIL illuminates A MIL does not illuminate B
Reconnect the throttle body connector.
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| B | |
| 4.CHECK ACCELERATOR PEDAL ASSEMBLY (CHECK MIL ILLUMINATED) |
Disconnect the accelerator pedal position sensor connector.
Turn the engine switch on (IG).
Check the MIL.
- Result:
Result Proceed to MIL illuminates A MIL does not illuminate B
Reconnect the accelerator pedal position sensor connector.
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| B | |
| 5.CHECK VVT SENSOR FOR INTAKE CAMSHAFT BANK 1 (CHECK MIL ILLUMINATED) |
Disconnect the VVT sensor for intake camshaft bank 1 connector.
Turn the engine switch on (IG).
Check the MIL.
- Result:
Result Proceed to MIL illuminates A MIL does not illuminate B
Reconnect the VVT sensor for intake camshaft bank 1 connector.
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| B | |
| 6.CHECK VVT SENSOR FOR EXHAUST CAMSHAFT BANK 1 (CHECK MIL ILLUMINATED) |
Disconnect the VVT sensor for exhaust camshaft bank 1 connector.
Turn the engine switch on (IG).
Check the MIL.
- Result:
Result Proceed to MIL illuminates A MIL does not illuminate B
Reconnect the VVT sensor for exhaust camshaft bank 1 connector.
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| B | |
| 7.CHECK VVT SENSOR FOR INTAKE CAMSHAFT BANK 2 (CHECK MIL ILLUMINATED) |
Disconnect the VVT sensor for intake camshaft bank 2 connector.
Turn the engine switch on (IG).
Check the MIL.
- Result:
Result Proceed to MIL illuminates A MIL does not illuminate B
Reconnect the VVT sensor for intake camshaft bank 2 connector.
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| B | |
| 8.CHECK VVT SENSOR FOR EXHAUST CAMSHAFT BANK 2 (CHECK MIL ILLUMINATED) |
Disconnect the VVT sensor for exhaust camshaft bank 2 connector.
Turn the engine switch on (IG).
Check the MIL.
- Result:
Result Proceed to MIL illuminates A MIL does not illuminate B
Reconnect the VVT sensor for exhaust camshaft bank 2 connector.
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| B | |
| 9.CHECK FUEL PRESSURE SENSOR (CHECK MIL ILLUMINATED) |
Disconnect the fuel pressure sensor connector.
Turn the engine switch on (IG).
Check the MIL.
- Result:
Result Proceed to MIL illuminates A MIL does not illuminate B
Reconnect the fuel pressure sensor connector.
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| B | |
| 10.CHECK BATTERY CURRENT SENSOR ASSEMBLY (CHECK MIL ILLUMINATED) |
Disconnect the battery current sensor connector.
Turn the engine switch on (IG).
Check the MIL.
- Result:
Result Proceed to MIL illuminates A MIL does not illuminate B
Reconnect the battery current sensor connector.
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| B | |
| 11.CHECK HARNESS AND CONNECTOR |
Disconnect the throttle body connector.
Disconnect the accelerator pedal position sensor connector.
Disconnect the VVT sensor for intake camshaft bank 1 connector.
Disconnect the VVT sensor for exhaust camshaft bank 1 connector.
Disconnect the VVT sensor for intake camshaft bank 2 connector.
Disconnect the VVT sensor for exhaust camshaft bank 2 connector.
Disconnect the fuel pressure sensor connector.
Disconnect the battery current sensor connector.
Disconnect the D3, D5 and A5 ECM connectors.
Check the resistance.
- Standard resistance (Check for short):
Tester Connections Specified Conditions VC (E3-29) - Body ground 10 kΩ or higher VC2 (E5-29) - Body ground 10 kΩ or higher VCPA (A6-35) - Body ground 10 kΩ or higher VCP2 (A6-27) - Body ground 10 kΩ or higher
Reconnect the ECM connectors.
Reconnect the canister pump module connector.
Reconnect the fuel pressure sensor connector.
Reconnect the VVT sensor for exhaust camshaft bank 2 connector.
Reconnect the VVT sensor for intake camshaft bank 2 connector.
Reconnect the VVT sensor for exhaust camshaft bank 1 connector.
Reconnect the VVT sensor for intake camshaft bank 1 connector.
Reconnect the accelerator pedal position sensor connector.
Reconnect the throttle body connector.
Reconnect the battery current sensor connector.
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| OK | ||
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