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Engine Control System (Service Information): Diagnosis Lexus GS III рестайлинг

Engine Control Systems 10 illustrations ~1745 words

ON-VEHICLE INSPECTION

Note. Perform the MAF meter inspection according to the procedures below. Only replace the MAF meter when the MAF value in the DATA LIST (with the engine stopped) is not within the normal operating range or there is foreign matter on the MAF meter platinum hot wire (heater).

  1. INSPECT MASS AIR FLOW METER Read the value the using Techstream (MAF). NOTE: Turn off the engine. Perform the inspection with the vehicle indoors and on a level surface. Perform the inspection of the MAF meter while it is installed to the air cleaner case (installed to the vehicle). During the test, do not use the exhaust air duct to perform suction on the exhaust pipe. Turn the power switch ON (ACC). Turn the power switch ON (do not run the engine). Turn the Techstream ON. Select the following menu items: Powertrain / Engine / Data List / MAF. Wait 30 seconds, and read the values on the Techstream. Standard condition Less than 0.64 g/sec. If the result is not as specified, replace the MAF meter. If the result is within the specified range, inspect the cause of the extremely rich or lean air fuel ratio. Refer to «DTC P2237: Oxygen (A/F) Sensor Pumping Current Circuit / Open (Bank 1 Sensor 1); DTC P2238: Oxygen (A/F) Sensor Pumping Current Circuit Low (Bank 1 Sensor 1); DTC P2239: Oxygen (A/F) Sensor Pumping Current Circuit High (Bank 1 Sensor 1); DTC P2240: Oxygen (A/F) Sensor Pumping Current Circuit / Open (Bank 2 Sensor 1); DTC P2241: Oxygen (A/F) Sensor Pumping Current Circuit Low (Bank 2 Sensor 1); DTC P2242: Oxygen (A/F) Sensor Pumping Current Circuit High (Bank 2 Sensor 1); DTC P2252: Oxygen (A/F) Sensor Reference Ground Circuit Low (Bank 1 Sensor 1); DTC P2253: Oxygen (A/F) Sensor Reference Ground Circuit High (Bank 1 Sensor 1); DTC P2255: Oxygen (A/F) Sensor Reference Ground Circuit Low (Bank 2 Sensor 1); DTC P2256: Oxygen (A/F) Sensor Reference Ground Circuit High (Bank 2 Sensor 1)»(ref-387085-S34082946992011022400000) .

Scheme 87

Scheme 87: REMOVAL
Scheme 87: REMOVAL
  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL WARNING: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.
  2. REMOVE COOL AIR INTAKE DUCT SEAL See step 5
  3. REMOVE ENGINE ROOM SIDE COVER RH See step 7
  4. REMOVE MASS AIR FLOW METER Disconnect the MAF meter connector. Remove the 2 screws and MAF meter. Remove the O-ring from the MAF meter.
  1. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY Connect the Techstream to the DLC3. Turn the power switch ON (IG). Turn the Techstream main switch ON. Set the vehicle to the "INSPECTION MODE". Refer to «INSPECTION MODE PROCEDURE»(ref-387083-S36792076252011022400000) . Start and warm up the engine. Idle the engine. Select the following menus: Powertrain / Engine / Active Test / Control the VVT Linear (Bank 1) or Control the VVT Linear (Bank 2) or Control the VVT System (Bank 1) or Control the VVT System (Bank 2) or Control the VVT Exhaust Linear (Bank 1) or Control the VVT Exhaust Linear (Bank 2). Specified condition Tester Operation Specified Condition OCV OFF Normal engine speed OCV ON Engine idles roughly or stalls soon after OCV is switched from OFF to ON If the result is not as specified, check the oil control valve and wirings. HINT: Control the VVT Linear (Bank 1): Command to activate exhaust and intake side oil control valves of bank 1 (Control range: Between -128 to 127%). Control the VVT Linear (Bank 2): Command to activate exhaust and intake side oil control valves of bank 2 (Control range: Between -128 to 127%). Control the VVT System (Bank 1): Command to activate oil control valve of bank 1 (Control range: ON/OFF). Control the VVT System (Bank 2): Command to activate oil control valve of bank 2 (Control range: ON/OFF). Control the VVT Exhaust Linear (Bank 1): Command to activate exhaust side oil control valve of bank 1 (Control range: Between -128 to 127%). Control the VVT Exhaust Linear (Bank 2): Command to activate exhaust side oil control valve of bank 2 (Control range: Between -128 to 127%).

Scheme 88

Scheme 88: REMOVAL
Scheme 88: REMOVAL

Scheme 89

Scheme 89
Scheme 89

Scheme 90

Scheme 90
Scheme 90

Scheme 91

Scheme 91
Scheme 91

Scheme 92

Scheme 92
Scheme 92

Scheme 93

Scheme 93
Scheme 93
  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL WARNING: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.
  2. REMOVE COOL AIR INTAKE DUCT SEAL See step 5
  3. REMOVE ENGINE ROOM SIDE COVER LH See step 6
  4. REMOVE ENGINE ROOM SIDE COVER RH See step 7
  5. REMOVE V-BANK COVER See step 8
  6. REMOVE FRONT UPPER FENDER PROTECTOR LH . Refer to «REMOVAL - Step 4»(ref-387095-S37991598032011022400000)
  7. REMOVE FRONT UPPER FENDER PROTECTOR RH . Refer to «REMOVAL - Step 5»(ref-387095-S37991598032011022400000)
  8. REMOVE FRONT FENDER TO COWL SIDE SEAL LH . Refer to «REMOVAL - Step 8»(ref-387095-S37991598032011022400000)
  9. REMOVE FRONT FENDER TO COWL SIDE SEAL RH . Refer to «REMOVAL - Step 9»(ref-387095-S37991598032011022400000)
  10. REMOVE FRONT WIPER ARM AND BLADE ASSEMBLY LH . Refer to «REMOVAL - Step 6»(ref-387095-S37991598032011022400000)
  11. REMOVE FRONT WIPER ARM AND BLADE ASSEMBLY RH . Refer to «REMOVAL - Step 7»(ref-387095-S37991598032011022400000)
  12. REMOVE COWL TOP VENTILATOR LOUVER SUB-ASSEMBLY . Refer to «REMOVAL - Step 10»(ref-387095-S37991598032011022400000)
  13. DRAIN ENGINE COOLANT . Refer to «REPLACEMENT - Step 5»(ref-387077-S08483786142011022400000)
  14. REMOVE NO. 2 VENTILATION HOSE See step 7
  15. REMOVE AIR CLEANER CAP WITH AIR CLEANER HOSE See step 8
  16. REMOVE THROTTLE BODY See step 9
  17. REMOVE INTAKE AIR SURGE TANK . Refer to «REMOVAL - Step 20»(ref-387088-S34306327892011022400000)
  18. REMOVE CAMSHAFT TIMING OIL CONTROL VALVE (for Exhaust Side of Bank 1) Disconnect the oil control valve connector. Remove the bolt and oil control valve. Remove the O-ring from the oil control valve.
  19. REMOVE CAMSHAFT TIMING OIL CONTROL VALVE (for Intake Side of Bank 1) Remove the bolt and V-bank cover bracket. Disconnect the oil control valve connector. Remove the bolt and oil control valve. Remove the O-ring from the oil control valve.
  20. REMOVE CAMSHAFT TIMING OIL CONTROL VALVE (for Intake Side of Bank 2) Disconnect the oil control valve connector. Remove the bolt and oil control valve. Remove the O-ring from the oil control valve.
  21. REMOVE CAMSHAFT TIMING OIL CONTROL VALVE (for Exhaust Side of Bank 2) Disconnect the wiring harness from the bracket. Remove the bolt and bracket. Disconnect the oil control valve connector. Remove the bolt and oil control valve. Remove the O-ring from the oil control valve.

Scheme 94

Scheme 94: INSPECTION
Scheme 94: INSPECTION

Scheme 95

Scheme 95
Scheme 95
  1. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY Measure the resistance between the terminals. Standard resistance 6.9 to 7.9 ohms at 20°C (68°F) If the result is not as specified, replace the oil control valve. Connect the battery's positive (+) lead to terminal 1 and negative (-) lead to terminal 2, and check the movement of the valve. OK Condition Specified Condition Battery positive (+) voltage is applied Valve moves in black arrow direction shown in illustration Battery positive (+) voltage is cut off Valve moves in white arrow direction shown in illustration If result is not as specified, replace the oil control valve. NOTE: If the valve cannot return properly because of foreign matter, a small pressure leak in the advanced direction may occur and a DTC may be output.

Scheme 96

Scheme 96: INSTALLATION
Scheme 96: INSTALLATION
  1. INSTALL CAMSHAFT TIMING OIL CONTROL VALVE (for Intake Side of Bank 2) Apply a light coat of engine oil to a new O-ring and install it to the oil control valve. Install the oil control valve with the bolt. Torque: 10 N*m ( 102 kgf*cm, 7 ft.*lbf) NOTE: Be careful that the O-ring is not cracked or jumped when installing the oil control valve. Connect the camshaft timing oil control valve connector. Install the bracket with the bolt. Torque: 10 N*m ( 104 kgf*cm, 7 ft.*lbf) Connect the wiring harness to the bracket.
  2. INSTALL CAMSHAFT TIMING OIL CONTROL VALVE (for Exhaust Side of Bank 2) Apply a light coat of engine oil to a new O-ring and install it to the oil control valve. Install the oil control valve with the bolt. Torque: 10 N*m ( 102 kgf*cm, 7 ft.*lbf) NOTE: Be careful that the O-ring is not cracked or jumped when installing the oil control valve. Connect the camshaft timing oil control valve connector.
  3. INSTALL CAMSHAFT TIMING OIL CONTROL VALVE (for Intake Side of Bank 1) Apply a light coat of engine oil to a new O-ring and install it to the oil control valve. Install the oil control valve with the bolt. Torque: 10 N*m ( 102 kgf*cm, 7 ft.*lbf) NOTE: Be careful that the O-ring is not cracked or jumped when installing the oil control valve. Connect the camshaft timing oil control valve connector. Install the V-bank cover bracket with the bolt. Torque: 10 N*m ( 102 kgf*cm, 7 ft.*lbf)
  4. INSTALL CAMSHAFT TIMING OIL CONTROL VALVE (for Bank 1 Exhaust Side) Apply a light coat of engine oil to a new O-ring and install it to the oil control valve. Install the oil control valve with the bolt. Torque: 10 N*m ( 102 kgf*cm, 7 ft.*lbf) NOTE: Be careful that the O-ring is not cracked or jumped when installing the oil control valve. Connect the camshaft timing oil control valve connector.
  5. INSTALL INTAKE AIR SURGE TANK . Refer to «INSTALLATION - Step 3»(ref-387088-S15542054702011022400000)
  6. INSTALL THROTTLE BODY See step 1
  7. INSTALL AIR CLEANER CAP WITH AIR CLEANER HOSE See step 2
  8. CONNECT NO. 2 VENTILATION HOSE See step 3
  9. ADD ENGINE COOLANT . Refer to «REPLACEMENT - Step 6»(ref-387077-S08483786142011022400000)
  10. CHECK FOR ENGINE COOLANT LEAKS . Refer to «ON-VEHICLE INSPECTION - Step 1»(ref-387093-S34097075662011022400000)
  11. INSTALL COWL TOP VENTILATOR LOUVER SUB-ASSEMBLY . Refer to «INSTALLATION - Step 3»(ref-387095-S02905546002011022400000)
  12. INSTALL FRONT WIPER ARM AND BLADE ASSEMBLY LH . Refer to «INSTALLATION - Step 6»(ref-387095-S02905546002011022400000)
  13. INSTALL FRONT WIPER ARM AND BLADE ASSEMBLY RH . Refer to «INSTALLATION - Step 7»(ref-387095-S02905546002011022400000)
  14. INSTALL FRONT FENDER TO COWL SIDE SEAL LH . Refer to «INSTALLATION - Step 4»(ref-387095-S02905546002011022400000)
  15. INSTALL FRONT FENDER TO COWL SIDE SEAL RH . Refer to «INSTALLATION - Step 5»(ref-387095-S02905546002011022400000)
  16. INSTALL FRONT UPPER FENDER PROTECTOR LH . Refer to «INSTALLATION - Step 9»(ref-387095-S02905546002011022400000)
  17. INSTALL FRONT UPPER FENDER PROTECTOR RH . Refer to «INSTALLATION - Step 10»(ref-387095-S02905546002011022400000)
  18. INSTALL V-BANK COVER See step 31
  19. INSTALL ENGINE ROOM SIDE COVER LH See step 32
  20. INSTALL ENGINE ROOM SIDE COVER RH See step 33
  21. INSTALL COOL AIR INTAKE DUCT SEAL See step 34
  22. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL
  23. PERFORM INITIALIZATION Perform initialization. Refer to «INITIALIZATION»(ref-386951-S21829001392011022400000) . NOTE: Certain systems need to be initialized after disconnecting and reconnecting the cable from the negative (-) battery terminal.

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