On-Vehicle Inspection

1. Inspect the engine coolant (See ON-VEHICLE INSPECTION ).

1. Inspect the engine oil (See ON-VEHICLE INSPECTION ).

1. Inspect the battery (See ON-VEHICLE INSPECTION ).

1. Inspect the spark plug (See INSPECTION ).

HINT:

You don't need to check the belt deflection because auto tensioner is adopted.

1. Warm up engine.
2. When using intelligent tester or OBD II scan tool:
   1. Connect the intelligent tester or OBD II scan tool to the DLC3.

      HINT:

      Please refer to the intelligent tester or OBD II scan tool operator's manual for further details.

3. When not using intelligent tester or OBD II scan tool:
   1. Using SST, connect terminal 13 (TC) and 4 (CG) of the DLC3.

      SST 09843-18040 

      NOTE:

      • Be sure not to connect incorrectly. It causes breakage of the engine.
      • Turn off all electrical systems.
      • Operate the inspection when the cooling fan motor is turned OFF.
      Fig 1: Identifying DLC3 Connector Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Remove the cylinder head cover No. 2 (See REMOVAL ).
   3. Pull out the wire harness as shown in the illustration.
   4. Connect the clip of the timing light to the engine.
      NOTE:

      • Use a timing light which can detect the first signal.
      • After checking, be sure to tape the wire harness.
      Fig 2: Pulling Out Wire Harness

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   5. Inspect ignition timing at idle.

      Ignition timing: 

      8 to 12° BTDC 

      NOTE: When checking the ignition timing, the transmission is in the neutral position.

      HINT:

      After engine rpm is kept at 1,000 to 1,300 rpm for 5 seconds, check that it returns to idle speed.

   6. Disconnect the terminal 13 (TC) and 4 (CG) of the DLC3.
   7. Inspect ignition timing at idle.

      Ignition timing: 

      10 to 18° BTDC 

   8. Confirm that ignition timing moves to advanced angle side when the engine rpm is increased.
   9. Remove the timing light.
   10. Install the cylinder head cover No. 2 (See INSTALLATION ).

1. Warm up engine.
2. When using intelligent tester or OBD II scan tool:
   1. Connect the intelligent tester or OBD II scan tool to the DLC3.

      HINT:

      Please refer to the intelligent tester or OBD II scan tool operators' manual for further details.

3. Check the idle speed.

   Idle speed: 

   650 to 750 rpm 

   NOTE:

   • Check idle speed with cooling fan OFF.
   • Switch off all accessories and air conditioning.

1. Warm up and stop engine.
2. Remove ignition coil.
3. Remove spark plugs.
4. Inspect cylinder compression pressure.

   SST 09992-00500 

   Fig 3: Inspecting Cylinder Compression Pressure

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Insert a compression gauge into the spark plug hole (Procedure "A").
   2. Fully open the throttle (Procedure "B").
   3. While cranking the engine, measure the compression pressure (Procedure "C").

      Compression pressure: 

      1,300 kPa (13.3 kgf/cm ²  , 189 psi) 

      Minimum pressure: 

      1,000 kPa (10.2 kgf/cm ²  , 145 psi) 

      Difference between each cylinder: 

      100 kPa (1.0 kgf/cm ²  , 15 psi) 

      NOTE:

      • Always use a fully charged battery to obtain engine speed of 250 rpm or more.
      • Check other cylinders' compression pressure in the same way.
      • This measurement must be done in as short a time as possible.
   4. 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 and repeat procedure "A" through "C" for cylinders with low compression.

      HINT:

      • If adding oil helps 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 sticking or seating is improper, or there may be leakage from the gasket.

1. Start the engine.
2. Race engine at 2,500 rpm for approx. 180 seconds.
3. Insert CO/HC meter testing probe at least 40 cm (1.3 ft) into tailpipe during idling.
4. Immediately check CO/HC concentration at idle and/or 2,500 rpm.

   HINT:

   • Complete the measuring within 3 minutes.
   • When doing the 2 mode (idle and 2,500 rpm) test, these measuring orders are prescribed by the applicable local regulations.
5. If the CO/HC concentration does not comply with regulations, troubleshoot in the order given below.
   1. Check 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) ).
   2. See the table below for possible causes, and then inspect and correct the applicable causes if necessary.