ENGINE ON-VEHICLE INSPECTION

CAUTION / NOTICE / HINT

CAUTION:

To prevent injury due to contact with an operating V-ribbed belt or cooling fan, keep your hands and clothing away from the V-ribbed belt and cooling fans when working in the engine compartment with the engine running or the engine switch on (IG).

PROCEDURE

INSPECT ENGINE COOLANT

Click here
INSPECT ENGINE OIL

Click here
INSPECT BATTERY

Click here
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 excessively damaged or oily. If necessary, replace the air cleaner filter element sub-assembly.
  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 SPARK PLUG

Click here
INSPECT V-RIBBED BELT

Click here
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
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 transaxle 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
    
    5 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 12° BTDC at idle
3. When not using the GTS:
  1. Remove the No. 1 engine cover sub-assembly.
    
    Click here
  2. *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.
  3. Disengage the 2 claws and open the wire harness protector as shown in the illustration.
  4. Pull out the wire harness as shown in the illustration.
    
    Note
    
    After checking, wrap the wire harness with tape.
  5. Connect the clip of the timing light to the wire harness.
    
    Note
    
    Use a timing light that detects the primary signal.
  6. Start the engine and run it at idle.
  7. Using a timing light, check the ignition timing.
    
    Standard Ignition Timing
    
    8 to 12° BTDC at idle
  8. Disconnect terminals 13 (TC) and 4 (CG) of the DLC3.
  9. Using a timing light, check the ignition timing.
    
    Standard Ignition Timing
    
    5 to 25° BTDC at idle
  10. Confirm that the ignition timing advances immediately when the engine speed is increased.
  11. Disconnect the clip of the timing light from the ignition coil wire for the No. 1 cylinder.
  12. Close the wire harness protector and engage the 2 claws.
  13. Install the No. 1 engine cover sub-assembly.
    
    Click here
INSPECT ENGINE IDLE SPEED
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 transaxle 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 tester.
    
    Standard Idle Speed
    
    750 to 850 rpm
3. *a DLC3
  
  When not using the GTS:
  1. 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 the wrong terminals may damage electrical components.
  2. Start the engine and run it at 2500 rpm for approximately 90 seconds.
  3. Check the idle speed.
    
    Standard Idle Speed
    
    750 to 850 rpm
    
    If the result is not as specified, check the air intake system.
  4. Disconnect the tachometer probe from terminal 9 (TAC) of the DLC3.
INSPECT COMPRESSION
1. Warm up and stop the engine.
2. Check for DTCs.
  
  Click here
3. Remove the 4 spark plugs.
  
  Click here
4. Disconnect the fuel injector connector (for Port Injection).
5. Disconnect the 2 fuel injector connectors (for Direct Injection).
6. 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.
    
    Standard Compression Pressure
    
    1200 kPa (12.2 kgf/cm², 174 psi)
    
    Minimum Compression Pressure
    
    900 kPa (9.2 kgf/cm², 131 psi)
    
    Pressure Difference between Each Cylinder
    
    100 kPa (1.0 kgf/cm², 15 psi) or less
    Note
    
    Inspect all cylinders in the same way.
    
    Measure the compression pressure as quickly as possible.
    Tech Tips
    
    Always use a fully charged battery to obtain an engine speed of 250 rpm or more.
  4. If the cylinder compression pressure is low, pour a small amount of engine oil into the cylinder through the spark plug hole and inspect it again.
    Tech Tips
    
    If adding engine 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.
7. Connect the 2 fuel injector connectors (for Direct Injection).
8. Connect the fuel injector connector (for Port Injection).
9. Install the 4 spark plugs.
  
  Click here
10. Clear the DTCs.
  
  Click here
  
  Note
  
  After performing the inspection, clear the DTCs and confirm that DTCs are not stored again or that the normal system code is output if using a check wire.

Tester Display
Ignition Timing Cylinder #1

Standard Ignition Timing
5 to 25° BTDC at idle

Active Test Display
Activate the TC Terminal

Data List Display
Ignition Timing Cylinder #1

Standard Ignition Timing
8 to 12° BTDC at idle

Standard Ignition Timing
8 to 12° BTDC at idle

Standard Ignition Timing
5 to 25° BTDC at idle

Tester Display
Engine Speed

Standard Idle Speed
750 to 850 rpm

Standard Idle Speed
750 to 850 rpm

Standard Compression Pressure
1200 kPa (12.2 kgf/cm², 174 psi)

Minimum Compression Pressure
900 kPa (9.2 kgf/cm², 131 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 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 the air fuel ratio sensor operation.

Click here
Check the heated oxygen sensor operation.

Click here

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

CO	HC	Symptom	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 - Brake booster line 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 - ECM - Fuel injector assemblies - Throttle with motor body assembly - Mass air flow meter sub-assembly

Symptom

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

- Brake booster line
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

- ECM

- Fuel injector assemblies

- Throttle with motor body assembly

- Mass air flow meter sub-assembly