Engine - On-Vehicle Inspection

1. Inspect engine coolant

2. Inspect engine oil

3. Inspect battery specific gravity

4. Inspect air cleaner filter element sub-assembly

5. Inspect fan and generator v belt

6. Inspect v-ribbed belt tensioner assembly

7. Warm up engine

8. Inspect ignition timing

9. Inspect engine idle speed

10. Inspect compression

11. Inspect co/hc

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1. The engine coolant should be between the LOW and FULL lines when the engine is cold.
   If low, check for leakage and add Toyota Super Long Life Coolant or similar high quality ethylene glycol based non-silicate, non-amine, non-nitrite, and non-borate coolant with long-life hybrid organic acid technology up to the FULL line.

1. Warm up the engine, then stop the engine and wait for 5 minutes.

2. Check that the engine oil level is between the low level and full level marks on the level gauge.
   If low, check for leakage and top oil up to the full level mark.

   NOTICE:

   Do not fill with engine oil to above the full level mark.

1. After having driven the vehicle and in the case that 20 minutes have not passed after having stopped the engine, turn the ignition switch ON and turn on the electrical system (headlight, blower motor, rear defogger etc.) for 60 seconds to remove the surface charge.

2. Turn the ignition switch OFF and turn off the electrical systems.

3. Measure the battery voltage between the negative (-) and positive (+) terminals of the battery.

   Standard voltage:

   12.5 to 12.9 V at 20°C (68°F)
   

   HINT:

   If the voltage is less than the specification, charge the battery.

4. Check the indicator as shown in the illustration.

   HINT:

   1. Blue: OK
      
   2. White: Charging Necessary
      
   3. Red: Insufficient Water
      

HINT:

As the belt tensioner coordinates belt tension automatically by its mechanism, you do not need to adjust it by yourself.

1. Check that the indicator mark on the automatic tensioner is within the A range as shown in the illustration.

2. When the mark is out of the standard range, replace the V belt with a new one.

1. Remove the V belt from the tensioner pulley. Then check that nothing gets caught the tensioner by turning it clockwise and counterclockwise.

2. When a malfunction exists, replace the tensioner.

1. When using the intelligent tester or OBD II scan tool:
   

   1. Connect the intelligent tester or OBD II scan tool to the DLC3.

      HINT:

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

      Ignition timing:

      5 to 15° BTDC at idle (Transmission in neutral)
      

   2. Disconnect the intelligent tester or OBD II scan tool from the DLC3.

2. When not using the intelligent tester or OBD II scan tool:
   

   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.

   4. Using SST, connect the tachometer probe to terminal TAC of the DLC3.

      SST

      09843-18030
      

   6. Using SST, connect terminals TC and CG of the DLC3.

      SST

      09843-18040
      

   8. Using the timing light, check the ignition timing.

      Ignition timing:

      5 to 15° BTDC at idle (Transmission in neutral)
      

   9. Remove the SST from the DLC3.

   10. Disconnect the timing light from the engine.

   11. Install the V-bank cover.

1. When using the intelligent tester or OBD II scan tool:
   

   1. Connect the intelligent tester or OBD II scan tool to the DLC3.

      HINT:

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

   2. Run the engine at 2,500 rpm for approx. 90 seconds.

   3. Check the idle speed.

      Idle speed:

      700 +- 50 rpm
      

      If the idle speed is not as specified, check the air intake system.
      

   4. Disconnect the intelligent tester or OBD II scan tool from the DLC3.

2. When not using the intelligent tester or OBD II scan tool:
   

   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.

   2. Run the engine at 2,500 rpm for approx. 90 seconds.

   3. Check the idle speed.

      Idle speed:

      700 +- 50 rpm
      

   4. Remove the SST from the DLC3.

   5. Disconnect the tachometer from the DLC3.

1. Remove the V-bank cover sub-assembly.

2. Remove the air cleaner hose assembly.

3. Disconnect the throttle control motor connector.

4. Remove the 8 ignition coils.

5. Remove the 8 spark plugs.

6. Disconnect the 8 injector connectors.

7. Inspect the cylinder compression pressure.
   

   1. Insert a compression gauge into the spark plug hole (Procedure "A").

   2. Fully open the throttle forcibly by hand.

   3. While cranking the engine, measure the compression pressure (Procedure "B").

      HINT:

      Always use a fully charged battery to obtain an engine speed of 250 rpm or more.

   4. Repeat procedures "A" to "B" for each cylinder.

      NOTICE:

      This measurement must be done as quickly as possible.

      Compression pressure:

      1,373 kPa (14.0 kgf/cm², 199 psi) or more
      

      Minimum pressure:

      1,030 kPa (10.5 kgf/cm², 149 psi)
      

      Difference between each cylinder:

      98 kPa (1.0 kgf/cm², 14 psi) or less
      

   5. 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 procedures "A" to "B" for the cylinders with low compression.

      1. If adding oil helps the compression, the piston rings and/or cylinder bore may be worn or damaged.
         
      2. If pressure stays low, a valve may be sticking, seating is improper, or there may be leakage past the gasket.
         

8. Connect the 8 injector connectors.

9. Install the 8 spark plugs.

10. Install the 8 ignition coils.

11. Connect the throttle control motor connector.

12. Install the air cleaner hose assembly.

13. Install the V-bank cover sub-assembly.

HINT:

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

1. Start the engine.

2. Sustain the engine speed at 2,500 rpm for approx. 180 seconds.

3. Insert the CO/HC meter testing probe at least 40 cm (1.3 ft) into the tailpipe during idling.

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

   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 the regulations, troubleshoot in the order given below.
   

   1. Check the heated oxygen sensor operation (Click here and Click here).

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

      CO	HC	Symptom	Cause
      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: PCV 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 Faulty MAF sensor