On-Vehicle Inspection

WARNING: This page is about a different variant/trim than selected.

INSPECT ENGINE COOLANT (See COOLING SYSTEM )
INSPECT ENGINE OIL (See LUBRICATION SYSTEM )
INSPECT BATTERY (See ON-VEHICLE INSPECTION )
INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
INSPECT SPARK PLUG (See ON-VEHICLE INSPECTION )
INSPECT VALVE LASH ADJUSTER ASSEMBLY 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 (See INSPECTION ).
INSPECT IGNITION TIMING
1. Warm up and stop the engine.
2. When using the Techstream:
  1. Connect the Techstream to the DLC3.
  2. Start the engine and idle it.
  3. Turn the Techstream main switch on.
  4. Enter the following menus: Powertrain/Engine/Data List/IGN Advance.
    Standard ignition timing:
    
    BTDC 5 to 15deg. at idle
    
    HINT:
    
    Refer to the Techstream operator's manual for further details.
    
    If the ignition timing is not as specified, check the valve timing.
  5. Check that the ignition timing advances immediately when the engine speed is increased.
  6. Enter the following menus: Powertrain/Engine/Active Test/Connect the TC and TE1/ON.
  7. Monitor IGN Advance of the Data List.
    Standard ignition timing:
    
    BTDC 8 to 12deg. at idle
    
    HINT:
    
    Refer to the Techstream operator's manual for further details.
    
    If the ignition timing is not as specified, check the valve timing.
  8. Enter the following menus: Connect the TC and TE1/OFF.
  9. Turn the ignition switch off.
  10. Disconnect the Techstream from the DLC3.
3. When not using the Techstream:
  1. Remove the No. 1 engine cover sub-assembly.
  2. Pull out the wire harness as shown in the illustration.
  3. Connect the clip of the timing light to the wire harness.
    NOTE: Use a timing light that detects primary signals.
    
    Fig 1: Connecting Clip Of Timing Light To Wire Harness
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3.
    SST 09843-18040
    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.
    Fig 2: Identifying DLC3 Connector Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. Using a timing light, check the ignition timing.
    Standard ignition timing:
    
    8 to 12 BTDC at idle
  6. Remove SST from the DLC3.
  7. Check the ignition timing.
    Standard ignition timing:
    
    5 to 15° BTDC at idle
    
    If the ignition timing is not as specified, check the valve timing.
  8. Check that the ignition timing advances immediately when the engine speed is increased.
  9. Disconnect the timing light from the engine.
  10. Install the No. 1 engine cover sub-assembly.
INSPECT ENGINE IDLE SPEED
1. Warm up and stop the engine.
2. When using the Techstream:
  1. Connect the Techstream to the DLC3.
    NOTE: Switch off all accessories and the A/C before connecting the Techstream.
  2. Race the engine at 2500 rpm for approximately 90 seconds.
  3. Turn the Techstream main switch on.
  4. Enter the following menus: Powertrain/Engine/Data List/Engine Speed.
    Standard idle speed:
    
    600 to 700 rpm
    
    HINT:
    
    Refer to the Techstream operator's manual for further details.
    
    NOTE: When checking the idle speed, the transmission should be in neutral.
    
    If the idle speed is not as specified, check the air intake system.
  5. Disconnect the Techstream from the DLC3.
3. When not using the Techstream:
  1. Using SST, connect a tachometer probe to terminal 9 (TAC) of the DLC3.
    SST 09843-18030
    
    NOTE: Confirm the terminal number before connecting the probe. Connecting the wrong terminals can damage the engine.
  2. Race the engine at 2500 rpm for approximately 90 seconds.
  3. Check the idle speed.
    
    Fig 3: Identifying DLC3 Connector Terminal
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Standard idle speed:
    
    600 to 700 rpm
    NOTE:
    Turn all electrical systems and the A/C off.
    
    Inspect the idle speed with the cooling fans off.
    
    When checking the idle speed, the transaxle should be in neutral.
    If the speed is not as specified, check the air intake system.
  4. Disconnect the tachometer probe from the DLC3.
INSPECT COMPRESSION
1. Warm up and stop the engine.
2. Check for DTCs (See DTC CHECK/CLEAR ).
3. Remove the No. 1 engine cover sub-assembly.
4. Disconnect the 4 fuel injector connectors.
5. Remove the 4 bolts and 4 ignition coils.
6. Remove the 4 spark plugs.
7. Insert a compression gauge into the spark plug hole.
8. Fully open the throttle.
9. While cranking the engine, measure the compression pressure.
  Standard compression pressure:
  
  1450 kPa (14.7 kgf/cm ² , 210 psi) or higher
  
  Minimum pressure:
  
  980 kPa (9.9 kgf/cm ² , 142 psi)
  
  Difference between each cylinder:
  
  200 kPa (2.0 kgf/cm ² , 29 psi) or less
  
  Fig 4: Measuring Compression Pressure
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT:
  
  Always use a fully charged battery to obtain an engine speed of 250 rpm or more.
10. If the cylinder compression is low in one or more cylinders, pour a small amount of engine oil into the cylinder with low compression through its spark plug hole. Then inspect the cylinder compression pressure again.
  HINT:
  - If adding oil helps boost the compression, it is likely that the piston rings and/or cylinder bore is worn or damaged.
  - If pressure stays low, a valve may be stuck or seated improperly, or there may be leakage in the gasket.
11. Install the 4 spark plugs.
  Torque: 25 N*m (254 kgf*cm, 18 ft.*lbf)
12. Install the 4 ignition coils with the 4 bolts.
  Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf)
13. Connect the 4 fuel injector connectors.
14. Install the No. 1 engine cover sub-assembly.
15. Clear the DTCs (See DTC CHECK/CLEAR ).

INSPECT CO/HC

HINT:

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

Start the engine.
Keep the engine speed at 2500 rpm for approximately 180 seconds.
Insert the CO/HC meter testing probe at least 40 cm (1.31 ft.) into the tailpipe during idling.

Immediately check CO/HC concentration at idle and 2500 rpm.

HINT:

When performing the 2 mode (2500 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 (See REMOVAL ) and heated oxygen sensor (See REMOVAL ) operation.

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

SYMPTOM CHART

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