ENGINE ON-VEHICLE INSPECTION

PROCEDURE

INSPECT ENGINE COOLANT

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INSPECT ENGINE OIL

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INSPECT BATTERY

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INSPECT SPARK PLUG

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INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
1. Remove the air cleaner filter element sub-assembly.
2. Visually check that the air cleaner filter element sub-assembly is not damaged or excessively oily.
  Tech Tips
  - If there is any dirt or clogs in the air cleaner filter element sub-assembly, clean it with compressed air.
  - If any dirt or clogs remain even after cleaning the air cleaner filter element sub-assembly with compressed air, replace it.
3. Install the air cleaner filter element sub-assembly.
INSPECT V-RIBBED BELT TENSIONER ASSEMBLY
1. Remove the V-ribbed belt.
  
  Click here
2. Turn the V-ribbed belt tensioner assembly clockwise and counterclockwise and check that it turns smoothly and does not catch.
  
  Tech Tips
  
  If the V-ribbed belt tensioner assembly does not turn smoothly or catches, replace the V-ribbed belt tensioner assembly.
3. Install the V-ribbed belt.
  
  Click here
INSPECT VALVE LASH ADJUSTER ASSEMBLY NOISE
1. Rev up the engine several times. Check that the engine does not emit unusual noises.
2. If unusual noises occur, warm up the engine and idle it for 30 minutes or more, then perform the inspection.
  
  Tech Tips
  
  If any defects or problems are found during the inspection, perform valve lash adjuster assembly inspection.
  
  Click here
INSPECT IGNITION TIMING
Note
- Check the ignition timing with the cooling fans off.
- Turn off all electrical systems and the A/C.
- When checking the ignition timing, the transmission should be in neutral or park.
1. Warm up and stop the engine.
2. When using the GTS:
  1. Connect the GTS to the DLC3.
  2. Start the engine and run it at idle.
  3. Turn the GTS on.
  4. Enter the following menus: Powertrain / Engine / Data List / Ignition Timing Cylinder #1.
    
    Powertrain > Engine > Data List
    
    Tester Display
    
    Ignition Timing Cylinder #1
    
    Standard Ignition Timing
    
    8 to 25° BTDC at idle
  5. Check that the ignition timing advances immediately when the engine speed is increased.
  6. Enter the following menus: Powertrain / Engine / Active Test / Activate the TC Terminal / ON.
    
    Powertrain > Engine > Active Test
    
    Active Test Display
    
    Activate the TC Terminal
    
    Data List Display
    
    Ignition Timing Cylinder #1
  7. Monitor Ignition Timing Cylinder #1 of the Data List.
    
    Standard Ignition Timing
    
    8 to 25° BTDC at idle
3. When not using the GTS:
  1. *a DLC3
    
    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 may damage electrical components.
  2. Remove the V-bank cover sub-assembly.
    
    Click here
  3. Connect the clip of a timing light to the ignition coil wire for the No. 1 cylinder.
    
    Note
    
    Use a timing light that detects primary signals.
  4. Start the engine and run it at idle.
  5. Check the ignition timing at idle.
    
    Standard Ignition Timing
    
    8 to 25° BTDC at idle
    
    Tech Tips
    
    Run the engine at 1000 to 1300 rpm for 5 seconds, and then check that the engine speed returns to engine idle speed.
  6. Disconnect terminals 13 (TC) and 4 (CG) of the DLC3.
  7. Check the ignition timing at idle.
    
    Standard Ignition Timing
    
    8 to 25° BTDC at idle
  8. Confirm that the ignition timing advances immediately when the engine speed is increased.
  9. Disconnect the clip of the timing light from the ignition coil wire for the No. 1 cylinder.
  10. Install the V-bank cover sub-assembly.
    
    Click here
INSPECT ENGINE IDLE SPEED
Note
- Check the idle speed with the cooling fans off.
- Turn off all the electrical systems and the A/C.
- When checking the engine idle speed, the transmission should be in neutral or park.
1. Warm up and stop the engine.
2. When using the GTS:
  1. Connect the GTS to the DLC3.
  2. Start the engine and run it at idle.
  3. Turn the GTS on.
  4. Enter the following menus: Powertrain / Engine / Data List / Engine Speed.
    
    Powertrain > Engine > Data List
    
    Tester Display
    
    Engine Speed
  5. Read the value displayed on the GTS.
    
    Standard Idle Speed
    
    600 to 700 rpm
3. When not using the GTS:
  1. *a DLC3
    
    Using SST, connect a tachometer probe to terminal 9 (TAC) of the DLC3.
    
    SST
    
    09843-18030
    
    Note
    
    Be sure to connect the tachometer probe to the correct terminal. Connecting to the wrong terminal may result in damage to electrical components.
  2. Turn the engine switch ON (IG).
  3. Inspect the engine idle speed.
    
    Standard Idle Speed
    
    600 to 700 rpm
  4. Turn the engine switch off.
  5. Disconnect the tachometer probe from terminal 9 (TAC) of the DLC3.
INSPECT COMPRESSION
Note

Keep the spark plug holes free of foreign matter when measuring the compression pressure.
1. Warm up and stop the engine.
2. Check for DTCs.
  
  Click here
3. Disconnect the 4 fuel injector connectors.
4. Remove the 6 spark plugs.
  
  Click here
5. Check the cylinder compression pressure.
  1. Insert a compression gauge into the spark plug hole.
  2. Fully open the throttle.
  3. While depressing the brake pedal, push the engine switch to crank the engine. Then check the compression pressure.
    
    Standard Compression Pressure
    
    1400 kPa (14.3 kgf/cm², 203 psi)
    
    Minimum Compression Pressure
    
    980 kPa (10.0 kgf/cm², 142 psi)
    
    Pressure Difference between each Cylinder
    
    100 kPa (1.0 kgf/cm², 15 psi) or less
    Note
    
    Always use a fully charged battery to obtain an engine speed of 250 rpm or more.
    
    Inspect all cylinders in the same way.
    
    Measure the compression pressure as quickly as possible.
  4. If the cylinder compression is low, pour a small amount of engine oil into the cylinder through the spark plug hole then inspect the cylinder compression pressure again.
    Tech Tips
    
    If adding oil increases the compression pressure, the piston rings and/or cylinder bore may be worn or damaged.
    
    If the compression pressure stays low, a valve may be stuck or seated improperly, or there may be leaks in the cylinder head gasket.
6. Install the 6 spark plugs.
  
  Click here
7. Connect the 4 fuel injector connectors.
8. Clear the DTCs.
  
  Click here
  
  Note
  
  After the inspection, clear the DTCs, check for DTCs again and make sure the normal system code is output.

Tester Display
Ignition Timing Cylinder #1

Standard Ignition Timing
8 to 25° BTDC at idle

Active Test Display
Activate the TC Terminal

Data List Display
Ignition Timing Cylinder #1

Standard Ignition Timing
8 to 25° BTDC at idle

Standard Ignition Timing
8 to 25° BTDC at idle

Standard Ignition Timing
8 to 25° BTDC at idle

Tester Display
Engine Speed

Standard Idle Speed
600 to 700 rpm

Standard Idle Speed
600 to 700 rpm

Standard Compression Pressure
1400 kPa (14.3 kgf/cm², 203 psi)

Minimum Compression Pressure
980 kPa (10.0 kgf/cm², 142 psi)

Pressure Difference between each Cylinder
100 kPa (1.0 kgf/cm², 15 psi) or less

INSPECT CO/HC

Tech Tips

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

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

Immediately check the CO/HC concentration at idle and then at an engine speed of 2500 rpm.

Tech Tips

When performing a 2 mode test (with the engine idling/running at 2500 rpm), the measurement procedures are determined by applicable local regulations.

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

Check for DTCs.

Click here

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

CO	HC	Problem	Cause
Normal	High	Rough idle	Faulty ignition: Incorrect valve timing Fouled, shorted or improperly gapped spark plugs Incorrect valve clearance (valve lash adjuster assembly) Leaks in intake or exhaust valves Leaks in cylinders
Low	High	Rough idle (Fluctuating HC reading)	Vacuum leaks: PCV hoses Intake manifold Throttle with motor body assembly Lean mixture causing misfire
High	High	Rough idle (Black smoke from exhaust)	Restricted air cleaner filter element sub-assembly Plugged PCV valve Faulty SFI system: Fuel pressure regulator assembly Engine coolant temperature sensor Mass air flow meter sub-assembly ECM Fuel injector assemblies Throttle position sensor (built in throttle with motor body assembly)

Problem

Cause

Normal

High

Rough idle

Faulty ignition:

Incorrect valve timing
Fouled, shorted or improperly gapped spark plugs

Incorrect valve clearance (valve lash adjuster assembly)
Leaks in intake or exhaust valves
Leaks in cylinders

Low

High

Rough idle

(Fluctuating HC reading)

Vacuum leaks:

PCV hoses
Intake manifold
Throttle with motor body assembly

Lean mixture causing misfire

High

Rough idle

(Black smoke from exhaust)

Restricted air cleaner filter element sub-assembly
Plugged PCV valve
Faulty SFI system:

Fuel pressure regulator assembly
Engine coolant temperature sensor
Mass air flow meter sub-assembly
ECM
Fuel injector assemblies
Throttle position sensor (built in throttle with motor body assembly)