On-Vehicle Inspection

WARNING: This page is about a different car, the 2007 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

CHECK IGNITION TIMING
1. When using the intelligent tester:
  1. Connect the intelligent tester to the DLC3.
    HINT:
    
    Refer to the intelligent tester operator's manual for further details.
    
    Standard ignition timing: 5 to 15° BTDC at idle (Shift lever on N)
    
    Fig 1: Connecting Intelligent Tester To DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Disconnect the intelligent tester from the DLC3.
2. When not using the intelligent tester:
  1. Remove the V-bank cover.
  2. Connect the tester probe of a timing light to the wire of the ignition coil connector for the No. 1 cylinder.
    
    Fig 2: Connecting Timing Light To Wire Of Ignition Coil Connector
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Using SST, connect the tachometer probe to terminal TAC of the DLC3.
    
    Fig 3: Connecting Tachometer Probe To Terminal TAC Of DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Using SST, connect terminals TC and CG of the DLC3.
    SST 09843-18040
    
    Fig 4: Connecting Terminals TC & CG Of DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. Using the timing light, check the ignition timing.
    Standard ignition timing: 5 to 15° BTDC at idle (Shift lever on N)
    
    Fig 5: Checking Ignition Timing
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. Remove the SST from the DLC3.
  7. Disconnect the timing light from the engine.
  8. Install the V-bank cover.
CHECK ENGINE IDLE SPEED
1. When using the intelligent tester:
  1. Connect the intelligent tester to the DLC3.
    HINT:
    
    Refer to the intelligent tester operator's manual for further details.
    
    Fig 6: Connecting Intelligent Tester To DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Maintain the engine at 2,500 rpm for approximately 90 seconds.
  3. Check the idle speed.
    Standard idle speed: 700 +- 50 rpm
    
    If the idle speed is not as specified, check the air intake system.
  4. Disconnect the intelligent tester from the DLC3.
2. When not using the intelligent tester:
  1. Using SST, connect the tachometer probe to terminal TAC of the DLC3.
    SST 09843-18030
    
    HINT:
    
    Refer to the intelligent tester operator's manual for further details.
    
    Fig 7: Connecting Tachometer Probe To Terminal TAC Of DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Maintain the engine at 2,500 rpm for approximately 90 seconds.
  3. Check the idle speed.
    Standard idle speed: 700 +- 50 rpm
  4. Remove the SST from the DLC3.
  5. Disconnect the tachometer from the DLC3.
CHECK COMPRESSION
1. Remove the V-bank cover.
2. Remove the air cleaner hose assembly.
3. Disconnect the throttle position sensor and control motor connector.
4. Remove the oil dipstick guide.
5. Remove the 8 ignition coils.
6. Remove the 8 spark plugs.
7. Disconnect the 8 injector connectors.
8. Check the cylinder compression pressure.
  
  Fig 8: Checking Cylinder Compression Pressure
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  NOTE: Check each cylinder's compression pressure in the same way.
  1. Insert a compression gauge into the spark plug hole.
  2. Fully open the throttle.
  3. While cranking the engine, measure the compression pressure.
    - Standard compression pressure: 1,373 kPa (14.0 kgf/cm ² , 199 psi) or more
    - Minimum pressure: 1,030 kPa (10.5 kgf/cm ² , 149 psi)
    - Difference between each cylinder: 98 kPa (1.0 kgf/cm ² , 14 psi)
    NOTE:
    Always use a fully charged battery to obtain an engine speed of 250 rpm or more.
    
    This measurement must be done as quickly as possible.
    If the cylinder compression is low, pour a small amount of engine oil into the cylinder through the spark plug hole and inspect again.
    
    HINT:
    
    If adding oil increases the compression, the piston rings and/or cylinder bore may be worn or damaged.
    
    If pressure stays low, a valve may be stuck or seated improperly, or there may be leakage in the gasket.
9. Connect the 8 injector connectors.
10. Install the 8 spark plugs.
11. Install the 8 ignition coils.
12. Install the oil dipstick guide.
13. Connect the throttle position sensor and control motor connector.
14. Install the air cleaner hose assembly.
15. Install the V-bank cover.

CHECK CO/HC

HINT:

This check is used only to determine whether or not the idle CO/HC complies with regulations.

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

Fig 9: Inserting CO/HC Meter Testing Probe Into Tailpipe During Idling
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Check CO/HC concentration at idle and/or 2,500 rpm.
HINT:
- Complete the measurement within 3 minutes.
- Check regulations in your area when performing 2 mode CO/HC concentration testing (engine check at both idle speed and at 2,500 rpm).

If the CO/HC concentration does not comply with regulations, perform troubleshooting in the order given below.

Check the heated oxygen sensor operation (see DTC P0136 OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 1 SENSOR 2): DTC P0137 OXYGEN SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 2): DTC P0138 OXYGEN SENSOR CIRCUIT HIGH VOLTAGE (BANK 1 SENSOR 2): DTC P0156 OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 2 SENSOR 2): DT ).

See SYMPTOM TABLE for possible causes, and then inspect and repair.

SYMPTOM TABLE

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