GSIC - Global Service Information Center

# ENGINE > ON-VEHICLE INSPECTION

## for Preparation Click here

1. INSPECT AIR CLEANER FILTER ELEMENT

1. Remove the air filter.

1. Visually check that the air filter is not excessively damaged or oily.
   If necessary, replace the air filter.

2. INSPECT V-RIBBED BELT TENSIONER

1. Idle the engine and then stop the engine. Check that the drive belt is between the edges of the tensioner pulley.

1. Remove the drive belt from the tensioner pulley.

1. Turn the pulley, and check that the tensioner bearing moves smoothly and quietly.
   If necessary, replace the tensioner.

1. Install the drive belt.

3. INSPECT NO. 1 IDLER PULLEY

1. Idle the engine and then stop the engine. Check that the drive belt is between the edges of the idler pulley.

1. Remove the drive belt from the idler pulley.

1. Turn the pulley, and check that the idler bearing moves smoothly and quietly.
   If necessary, replace the idler pulley.

1. Install the drive belt.

4. CHECK VALVE LASH ADJUSTER NOISE

1. Rev up the engine several times. Check that the engine does not emit unusual noises.

1. If unusual noises occur, warm up the engine and idle it for over 30 minutes. Then repeat the step above.

   HINT:
     If any defects or problems are found during the inspection above, perform a lash adjuster inspection (Click here).

5. INSPECT IGNITION TIMING

1. Warm up the engine and stop the engine.

   NOTICE:
     A warmed up engine should have an engine coolant temperature of over 80°C (176°F), have an engine oil temperature of 60°C (140°F), and the engine rpm should be stabilized.

1. When using the intelligent tester:
   Check the ignition timing.

   1. Connect the intelligent tester to the DLC3.

   2. Start the engine at idle.

   3. Turn the intelligent tester main switch ON.

   4. Enter the following item: Powertrain / Engine and ECT / Data List / IGN Advance.

      Ignition timing:
        0 to 20 BTDC @ idle

      HINT:
        Please refer to the intelligent tester operator's manual for further details.

1. When not using the intelligent tester:
   Check the ignition timing.

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

      SST
        09843-18030

      NOTICE:
      1. Confirm the terminal numbers before connecting them. Connection with a wrong terminal can damage the engine.
      2. Turn off all electrical systems before connecting the terminals.

   2. Clamp the tester probe of a timing light to the 4 lead wires or green/red lead wire of the ignition coil connector for No. 1 cylinder.

   3. Start the engine.

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

      SST
        09843-18040

      NOTICE:
        When checking the ignition timing, the transmission should be in the neutral position.

      HINT:
      2. After connecting terminals (TC and CG), engine rpm changes to approximately 1,000 to 1,500 rpm for 5 seconds, then returns to idle speed. Because the ECM checks that the ISC (idle speed control system) operates properly.
      3. Perform the inspection of the ignition timing after engine rpm is returned to idle speed.

   5. Using a timing light, measure the ignition timing.

      Ignition timing:
        3 to 7 BTDC @ idle

   6. Remove the SST from terminals 13 (TC) and 4 (CG) of the DLC3.

   7. Check the ignition timing.

      Ignition timing:
        0 to 20 BTDC @ idle

   8. Confirm that ignition timing moves to the advanced angle side when the engine speed is increased.

   9. Remove the timing light.

6. INSPECT ENGINE IDLE SPEED

1. Warm up and stop the engine.

   NOTICE:
     A warmed up engine should have an engine coolant temperature of over 80°C (176°F), have an engine oil temperature of 60°C (140°F), and the engine rpm should be stabilized.

1. When using the intelligent tester: Check the idle speed.

   1. Connect the intelligent tester to the DLC3.

      HINT:
        Please refer to the intelligent tester operator's manual for further details.

   2. Start the engine at idle.

   3. Turn the intelligent tester main switch ON.

   4. Enter the following item:
      Powertrain / Engine and ECT / Data List / Engine SPD.

      Idle speed:
        650 to 750 rpm

      NOTICE:
      1. When checking the idle speed, the transmission should be in the neutral position.
      2. Switch off all accessories and air conditioning before connecting the intelligent tester.

1. When not using the intelligent tester:
   Check the idle speed.

   1. Using SST, connect tachometer tester probe to terminal 9 (TAC) of the DLC3.

      SST
        09843-18030

   2. Start the engine at idle.

   3. Check the idle speed.

      Idle speed:
        650 to 750 rpm

7. INSPECT IDLE SPEED CONTROL SYSTEM

1. Warm up and stop the engine.

   NOTICE:
     A warmed up engine should have an engine coolant temperature of over 80°C (176°F), have an engine oil temperature of 60°C (140°F), and the engine rpm should be stabilized.

1. Check the idle speed control system.

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

      SST
        09843-18040

   2. Start the engine at idle.

      NOTICE:
      1. Confirm the terminal numbers before connecting them. Connection with a wrong terminal can damage the engine.
      2. Turn off all electrical systems before connecting the terminals.
      3. When checking ISC function, the transmission should be in the neutral position.

   3. After connecting terminals (TC and CG), check that the engine speed changes to approximately 1,000 to 1,500 rpm for 5 seconds, and then returns to idle speed.
      If the result is not as specified, check the throttle body, DTC (Click here) and wire harness.

8. INSPECT COMPRESSION

1. Warm up and stop the engine.

   NOTICE:
     A warmed up engine should have an engine coolant temperature of over 80°C (176°F), have an engine oil temperature of 60°C (140°F), and the engine speed should be stabilized.

1. Disconnect the injector connectors.

1. Remove the ignition coils.

1. Remove the spark plugs.

1. Check the cylinder compression pressure.

   1. Insert a compression gauge into the spark plug hole.

   2. Fully open the throttle.

   3. While cranking the engine, measure the compression pressure.

      Compression pressure:
        1,230 kPa (12.5 kgf/cm2, 178 psi)

      Minimum pressure:
        880 kPa (9 kgf/cm2, 128 psi)

      Difference between each cylinder:
        98 Pa (1.0 kgf/cm2, 14 psi)

      NOTICE:
      1. Always use a fully charged battery to obtain an engine speed of 250 rpm or more.
      2. Check the other cylinders' compression pressure in the same way.
      3. 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:
      1. If adding oil increases the compression, the piston rings and/or cylinder bore may be worn or damaged.
      2. If pressure stays low, a valve may be stuck or seated improperly, or there may be leakage in the gasket.

9. CHECK CO/HC

1. Start and warm up the engine.

1. Run the engine at 2,500 rpm for approximately 180 seconds and idle the engine.

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

1. Check CO/HC concentration at idle.

   Idle CO concentration:
     0 to 0.5%

   Idle HC concentration:
     Applicable local regulation

1. If the CO/HC concentration is not as specified, perform troubleshooting in the order given below.

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

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

      CO | HC | Problems | Causes

      Normal

      High

      Rough idle

      1. Faulty ignitions:
      1. Incorrect timing
      2. Plugs are contaminated, shorted or gaps are defective
      2. Incorrect valve clearance
      3. Leaks in intake and exhaust valves
      4. Leaks in cylinders

      Low

      High

      Rough idle
      (Fluctuating HC reading)

      1. Vacuum leaks:
      1. PCV hoses
      2. Intake manifold
      3. Throttle body
      4. Brake booster line
      2. Lean mixture causing misfire

      High

      High

      Rough idle
      (Black smoke from exhaust)

      1. Restricted air filter
      2. Plugged PCV valve
      3. Faulty SFI system:
      1. Faulty pressure regulator
      2. Defective ECT sensor
      3. Defective Mass Air Flow (MAF) meter
      4. Faulty ECM
      5. Faulty injectors
      6. Faulty throttle position sensor