On-Vehicle Inspection

HINT:

• If there is any dirt or a blockage in the air cleaner filter element sub-assembly, clean it with compressed air.
• If any dirt or a blockage remains even after cleaning the air cleaner filter element sub-assembly with compressed air, replace it.

HINT:

If any defects or problems are found during the preceding inspection, perform valve lash adjuster inspection (See INSPECTION  ).

Check the ignition timing.

1. Connect Techstream to the DLC3.
2. Warm up the engine.
3. Turn the tester on.
4. Enter the following menu items: Powertrain/Engine and ECT/Data List/IGN Advance.
5. Read the value displayed on the tester.

   Ignition timing: 

   8 to 12° BTDC at idle 

   HINT:

   Refer to Techstream operator's manual for help when selecting the DATA LIST.

Check the ignition timing.

1. Warm up the engine.
2. 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.
   • Turn off all electrical systems before connecting the terminals.
   • Perform this inspection after the cooling fan motor is turned off.
     Fig 1: Identifying DLC3 Connector

     Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Remove the V-bank cover sub-assembly.
4. Pull out the red lead wire harness.
5. Connect the tester terminal of the timing light to the red lead wire as shown in the illustration.
   NOTE: Use a timing light which detects the No. 1 cylinder ignition signal.
6. Check the ignition timing at idle.

   Standard ignition timing: 

   8 to 12° BTDC at idle 

   NOTE: When checking the ignition timing, the transmission should be in the neutral position.
   Fig 2: Connecting Tester Terminal Of Timing Light To Red Lead Wire

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   Run the engine at 1000 to 1300 rpm for 5 seconds, and then check that the engine rpm returns to idle speed.

7. Disconnect terminals 13 (TC) and 4 (CG) of the DLC3.
8. Check the ignition timing at idle.

   Standard ignition timing: 

   7 to 24° BTDC at idle 

9. Confirm that the ignition timing advances immediately when the engine rpm is increased.
10. Remove the timing light from the engine.

1. Connect Techstream to the DLC3.
2. Warm up the engine.
3. Turn the tester on.
4. Enter the following menu items: Powertrain/Engine and ECT/Data List/Engine Speed.
5. Read the value displayed on the tester.

   Idle speed: 

   600 to 700 rpm 

   NOTE:

   • When checking the idle speed, the transmission should be the in neutral position.
   • Check the idle speed with the cooling fan off.
   • Switch off all accessories and air conditioning before connecting Techstream.

   HINT:

   Refer to Techstream operator's manual for further details.

Check the idle speed.

1. Warm up the engine.
2. Using SST, connect the tachometer test probe to terminal 9 (TAC) of the DLC3.

   SST 09843-18030 

3. Check the idle speed.

   Standard idle speed: 

   600 to 700 rpm 

   Fig 3: Identifying DLC3 Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Insert a compression gauge into the spark plug hole.
2. While cranking the engine, measure the compression pressure.

   Standard compression pressure: 

   1.3 MPa (13 kgf/cm ²  , 189 psi) 

   Minimum pressure: 

   0.98 MPa (10 kgf/cm ²  , 142 psi) 

   Difference between each cylinder: 

   0.1 MPa (1.0 kgf/cm ²  , 15 psi) 

   Fig 4: Checking Cylinder Compression Pressure

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   NOTE:

   • Always use a fully charged battery to obtain an engine speed of 250 rpm or more.
   • Check the other cylinders' compression pressure in the same way.
   • This measurement must be done as quickly as possible.
3. 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.

Torque: 18 N*m (184 kgf*cm, 13 ft.*lbf) 

Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) 

HINT:

Check regulations and restrictions in your area when performing 2 mode CO/HC concentration testing (engine check at both idle speed and at 2500 rpm).

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

1. Check the air fuel ratio sensor and heated oxygen sensor operation.
2. See the following table for possible causes, and then inspect and repair if necessary.
   PROBLEM AND CAUSE CHART
   
   

   CO	HC	Problem	Cause
   Normal	High	Rough idle	Faulty ignitions: Incorrect timing Fouled, shorted or improperly gapped plugs Incorrect valve clearance (valve lash adjuster) Leaks in intake and exhaust valves Leaks in cylinders
   Low	High	Rough idle (Fluctuating HC reading)	Vacuum leaks: PCV hoses Intake manifold Throttle body assembly Brake booster line Lean mixture causing misfire
   High	High	Rough idle (Black smoke from exhaust)	Restricted air filter Plugged PCV valve Faulty SFI system: Faulty fuel pressure regulator Defective engine coolant temperature sensor Defective mass air flow meter Faulty ECM Faulty injector assemblies Faulty