On-Vehicle Inspection

WARNING: This page is about a different car, the 2006 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT ENGINE COOLANT
1. Inspect the engine coolant (See ON-VEHICLE INSPECTION ).
INSPECT ENGINE OIL
1. Inspect the engine oil (See ON-VEHICLE INSPECTION ).
INSPECT BATTERY
1. Inspect the battery (See ON-VEHICLE INSPECTION ).
INSPECT SPARK PLUG
1. Inspect the spark plug (See ON-VEHICLE INSPECTION ).
INSPECT AIR CLEANER FILTER ELEMENT SUBASSEMBLY
1. Remove the air cleaner filter element sub-assembly.
2. Visually check that there is no dirt, blockage, and/or damage to the air cleaner filter element.
  HINT:
  - If there is any dirt or a blockage in the air cleaner filter element, clean it with compressed air.
  - If any dirt or a blockage remains even after cleaning the air cleaner filter element with compressed air, replace it.
INSPECT VALVE LASH ADJUSTER NOISE
1. Rev up the engine several times. Check that the engine does not emit unusual noises.
  If unusual noises occur, warm up the engine and idle it for over 30 minutes. Then perform the inspection above again.
  
  If any defects or problems are found during the inspection above, perform a lash adjuster inspection.
INSPECT IGNITION TIMING
1. Warm up the engine and stop the engine.
  NOTE: A warmed up engine should have an engine coolant temperature of over 80°C (176°F), have an engine oil temperature of 60°C (140°F), and the engine rpm should be stabilized.
2. When using the intelligent tester:
  1. Connect the intelligent tester to the DLC3.
  2. Start the engine and idle it.
  3. Push the intelligent tester main switch ON.
  4. Enter the following items: Powertrain / Engine and ECT / Data list / IGN Advance.
    
    Fig 1: Connecting Intelligent Tester To DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Ignition timing: 8 to 18° BTDC at idle
    
    HINT:
    
    Refer to the intelligent tester operator's manual for further details.
3. When not using the intelligent tester:
  1. Remove the V-bank cover sub-assembly.
  2. Connect the tester probe of a timing light to the wire of the ignition connector for No. 1 cylinder.
    
    Fig 2: Identifying V-Bank Cover Sub-Assembly
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    NOTE: Use a timing light which can detect the primary current.
  3. Using SST, connect terminals TC and CG of the DLC3.
    SST 09843-18040
    
    Fig 3: Identifying Connector Terminals DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    NOTE:
    Confirm the terminal numbers before connecting them. Connecting the wrong terminals can damage the engine.
    
    When checking the ignition timing, the transmission should be in neutral.
  4. Using a timing light, check the ignition timing.
    Ignition timing: 8 to 12 BTDC at idle
  5. Remove the SST from the DLC3.
  6. Check the ignition timing.
    Ignition timing: 8 to 18° BTDC at idle
  7. Check that the ignition timing advances immediately when the engine speed is increased.
  8. Disconnect the timing light from the engine.
  9. Install the V-bank cover sub-assembly.
    
    Fig 4: Checking Ignition Timing
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT ENGINE IDLE SPEED
1. Warm up and stop the engine.
  NOTE: A warmed up engine should have an engine coolant temperature of over 80°C (176°F) and an engine oil temperature of 60°C (140°F), and the engine rpm should be stabilized.
2. When using the intelligent tester:
  1. Connect the intelligent tester to the DLC3.
    
    Fig 5: Connecting Intelligent Tester To DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    NOTE: Switch off all accessories and A/C before connecting the intelligent tester.
  2. Race the engine speed at 2,500 rpm for approx. 90 seconds.
  3. Push the intelligent tester main switch ON.
  4. Enter the following items: powertrain / Engine and ECT / Data list / Engine SPD.
    Idle speed: 600 to 700 rpm
    
    NOTE: When checking the idle speed, the transmission should be in the neutral.
    
    HINT:
    
    Refer to the intelligent tester operator's manual for further details.
    
    If the idle speed is not as specified, check the air intake system.
  5. Disconnect the intelligent tester from the DLC3.
3. When not using the intelligent tester:
  1. Using SST, connect the tachometer probe to terminal TAC of the DLC3.
    
    Fig 6: Identifying Connector Terminals DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    SST 09843-18040
    
    NOTE: Confirm the terminal numbers before connecting them. Connecting the wrong terminals can damage the engine.
  2. Race the engine speed at 2,500 rpm for approx. 90 seconds.
  3. Check the idle speed.
    Idle speed (Transmission neutral position): 600 to 700 rpm
    
    If the speed is not as specified, check the air intake system.
  4. Disconnect the tachometer from the DLC3.
INSPECT COMPRESSION
1. Warm up and stop the engine.
  NOTE: A warmed up engine should have an engine coolant temperature of over 80°C (176°F) and an engine oil temperature of 60°C (140°F), and the engine rpm should be stabilized.
2. Remove the cool air intake duct seal.
3. Remove engine room side cover LH.
4. Remove engine room side cover RH.
5. Remove the V-bank cover.
6. Remove the air cleaner inlet No. 1.
7. Remove the air cleaner cap with the air cleaner hose.
8. Disconnect the 3 clamps and connector.
  
  Fig 7: Identifying Clamps
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
9. Disconnect the 4 connectors.
10. Disconnect the throttle body connector.
11. Disconnect the 6 injector connectors.
12. Remove the 6 ignition coils.
13. Remove the 6 spark plugs.
  
  Fig 8: Identifying Connectors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
14. Disconnect the 2 injector driver connectors as shown in the illustration.
  
  Fig 9: Identifying Injector Driver Connectors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
15. Insert a compression gauge into the spark plug hole.
16. Fully open the throttle.
17. While cranking the engine, measure the compression pressure.
  
  Fig 10: Inserting Compression Gauge Into Spark Plug Hole
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT:
  
  Always use a fully charged battery to obtain engine speed of 250 rpm or more.
  
  NOTE: The measurement must be done as quickly as possible.
  
  Standard compression pressure: 1.4 MPa (14 kgf*cm ² , 199 psi) or more
  
  Minimum pressure: 0.98 MPa (10.0 kgf*cm ² , 142 psi)
18. Perform the inspection above for each cylinder.
  Difference between each cylinder: 0.1 MPa (1.0 kgf*cm ² , 15 psi) or less
19. If the cylinder compression in one or more cylinders is low, pour a small amount of engine oil into the cylinder through the spark plug hole. Then perform the first 3 steps under "inspect the cylinder compression pressure" for the cylinders with low compression.
  HINT:
  - If adding oil helps boost the compression, it is likely that the piston rings and/or cylinder bore are worn or damaged.
  - If pressure stays low, a valve may be stuck or seated improperly, or there may be leakage in the gasket.
20. Connect the 2 injector driver connectors as shown in the illustration.
21. Install the 6 spark plugs.
  Torque: 25 N*m (254 kgf*cm, 18 ft.*lbf)
22. Install the 6 ignition coils.
  Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf)
23. Connect the 6 injector connectors.
24. Connect the throttle body connector.
  
  Fig 11: Identifying Connectors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
25. Connect the 4 connectors.
  
  Fig 12: Identifying Connectors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
26. Connect the 3 clamps and connector.
27. Install the air cleaner cap with the air cleaner hose.
28. Install the air cleaner inlet No. 1.
  Torque: 5.0 N*m (51 kgf*cm, 44 in.*lbf)
29. Install the V-bank cover.
30. Remove the engine room side cover LH.
31. Remove the engine room side cover RH.
32. Install the cool air intake duct seal.
  
  Fig 13: Identifying Clamps
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT CO/HC

HINT:

This check for determining whether or not the idle CO / HC complies with regulations.

Start the engine.
Keep the engine speed at 2,500 rpm for approx. 180 seconds.
Insert the CO / HC meter testing probe at least 40 cm (1.3 ft) into the tailpipe during idling.

Immediately check CO / HC concentration at idle and / or 2,500 rpm.

Fig 14: Inspecting CO/HC

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

When performing the 2 mode (2,500 rpm and idle) test, follow the measurement order prescribed by the applicable local regulations.
If the CO / HC concentration does not comply with regulations, troubleshoot in the order given below.

Check the A/F sensor and heated oxygen sensor operation.

See the table below for possible causes, then inspect and correct the applicable causes if necessary.

POSSIBLE CAUSES REFERENCE

CO	HC	Symptom	Causes
Normal	High	Rough idle	Faulty ignitions Incorrect timing Fouled, shorted or improperly gapped plugs Leaky intake and exhaust valves Leaky cylinder
Low	High	Rough idle (Fluctuating HC reading)	Vacuum leaks PCV hose Intake manifold Throttle body Lean mixture causing misfire
High	High	Rough idle (Black smoke from exhaust)	Restricted air filter Faulty fuel SFI system Faulty pressure Defective ECT sensor Faulty ECM Faulty injector Faulty throttle position sensor Faulty MAF sensor