ENGINE ON-VEHICLE INSPECTION

CAUTION / NOTICE / HINT

Tech Tips

The type of ignition switch used on this model differs according to the specifications of the vehicle. For the expressions listed in this section, refer to the "Ignition Switch Expressions" precaution Click here.

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 cap.
2. Remove the air filter element.
3. Visually check that the air filter is not excessively damaged or oily.
  
  If necessary, replace the air cleaner filter element.
INSPECT SPARK PLUG

Click here
INSPECT V-RIBBED BELT

Click here
INSPECT VALVE LASH ADJUSTER NOISE
1. Rev up the engine several times. Check that the engine does not emit unusual noises.
  
  If unusual noises occur, warm up the engine and idle it for over 30 minutes. Then perform the inspection above again.
  
  If any defects or problems are found during the inspection above, perform a lash adjuster inspection Click here.
INSPECT IGNITION TIMING
1. Warm up and stop the engine.
2. When using an intelligent tester:
  1. Connect the intelligent tester to the DLC3.
  2. Start the engine and idle it.
  3. Turn the intelligent tester main switch on.
  4. Enter the following menus: Powertrain / Engine and ECT / Data List / IGN Advance.
    
    Standard ignition timing
    
    0 to 14° BTDC @ idle
    
    Tech Tips
    
    Refer to the intelligent tester operator's manual for further details.
    Note
    
    Turn all the electrical systems and the A/C off.
    
    Check the ignition timing with the cooling fan off.
    
    When checking the ignition timing, the shift lever should be in neutral.
  5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Connect the TC and TE1.
  6. Monitor IGN Advance of the Data List.
    
    Standard ignition timing
    
    8 to 12° BTDC @ idle
    
    Tech Tips
    
    Refer to the intelligent tester operator's manual for further details.
    Note
    
    Turn all the electrical systems and the A/C off.
    
    Check the ignition timing with the cooling fan off.
    
    When checking the ignition timing, the shift lever should be in neutral.
  7. Check that the ignition timing advances immediately when the engine speed is increased.
  8. Turn the ignition switch off.
  9. Disconnect the intelligent tester from the DLC3.
3. When not using the intelligent tester:
  1. Remove the No. 2 cylinder head cover.
  2. Connect the tester probe of a timing light to the wire of the ignition coil connector for the No. 1 cylinder.
    
    Note
    
    Use a timing light that detects primary signals.
  3. Start the engine and idle it.
  4. Text in Illustration
    
    *1 Front View of 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 can damage the engine.
    
    When checking the ignition timing, the shift lever should be in neutral.
  5. Using the timing light, check the ignition timing.
    
    Standard ignition timing
    
    8 to 12° BTDC @ idle
    
    Note
    
    Turn all the electrical systems and the A/C off.
    
    Check the ignition timing with the cooling fan off.
    
    When checking the ignition timing, the shift lever should be in neutral.
  6. Remove SST from the DLC3.
  7. Inspect the ignition timing at idle.
    
    Standard ignition timing
    
    0 to 14° BTDC @ idle
    
    Note
    
    Turn all the electrical systems and the A/C off.
    
    Check the ignition timing with the cooling fan off.
    
    When checking the ignition timing, the shift lever should be in neutral.
  8. Check that the ignition timing advances immediately when the engine speed is increased.
  9. Turn the ignition switch off.
  10. Remove the timing light.
  11. Install the No. 2 cylinder head cover.
INSPECT ENGINE IDLE SPEED
1. Warm up and stop the engine.
2. When using the intelligent tester:
  1. Connect the intelligent tester to the DLC3.
  2. Turn the ignition switch to ON.
  3. Enter the following menus: Powertrain / Engine and ECT / Data List / Engine Speed.
    
    Standard idle speed
    
    580 to 680 rpm
    
    Tech Tips
    
    Refer to the intelligent tester operator's manual for further details.
    Note
    - Turn all the electrical systems and the A/C off.
    - Check the ignition timing with the cooling fan off.
    - When checking the idling speed, the shift lever should be in neutral.
3. Turn the ignition switch off.
4. Disconnect the intelligent tester from the DLC3.
5. Text in Illustration
  
  *1 Front View of DLC3
  
  When not using the intelligent tester:
  1. Using SST, connect a tachometer probe to terminal 9 (TAC) of the DLC3.
    
    SST
    
    09843-18030
    Note
    
    Confirm the terminal numbers before connecting them. Connecting the wrong terminals can damage the engine.
    
    When checking the idling speed, the shift lever should be in neutral.
  2. Check the idle speed.
    
    Standard idle speed
    
    580 to 680 rpm
  3. Disconnect the tachometer probe from 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 4 fuel injector connectors.
5. Text in Illustration
  
  *1 Compression Gauge
  
  Inspect 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
    
    1373 kPa (14.0 kgf/cm², 199 psi) or higher
    
    Minimum pressure
    
    1079 kPa (11.0 kgf/cm², 156 psi)
    
    Difference between each cylinder
    
    98 kPa (1.0 kgf/cm², 14.2 psi) or less
    
    CAUTION:
    
    Wear protective gloves when measuring the compression to avoid injuring your hands on the outer cowl top panel.
    Note
    
    Use a fully-charged battery so the engine speed can be increased to 250 rpm or more.
    
    Inspect the other cylinders in the same way.
    
    Measure the compression in as short a time as possible.
  4. If the cylinder compression is low, pour a small amount of engine oil into the cylinder through the spark plug hole, and then inspect it again.
    Tech Tips
    
    If adding oil increases the compression, the piston rings and/or cylinder bore may be worn or damaged.
    
    If the pressure stays low, the valve may be stuck or seated improperly, or there may be leakage from the gasket.
6. Connect the 4 fuel injector connectors.
7. Install the 4 spark plugs Click here.
8. Clear the DTCs Click here.

Standard ignition timing
0 to 14° BTDC @ idle

Standard ignition timing
8 to 12° BTDC @ idle

Text in Illustration
*1	Front View of DLC3

Standard ignition timing
8 to 12° BTDC @ idle

Standard ignition timing
0 to 14° BTDC @ idle

Standard idle speed
580 to 680 rpm

Text in Illustration
*1	Front View of DLC3

Standard idle speed
580 to 680 rpm

Text in Illustration
*1	Compression Gauge

Standard compression pressure
1373 kPa (14.0 kgf/cm², 199 psi) or higher

Minimum pressure
1079 kPa (11.0 kgf/cm², 156 psi)

Difference between each cylinder
98 kPa (1.0 kgf/cm², 14.2 psi) or less

INSPECT CO/HC

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

Check the CO/HC concentration during idling and when the engine is running at 2500 rpm.

Tech Tips

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

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

Check the air fuel ratio sensor (See page ) and heated oxygen sensor operation Click here.

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

CO	HC	Problems	Possible Causes
Normal	High	Rough idling	Faulty ignition: Incorrect timing Plugs are contaminated or shorted, or gaps are defective Incorrect valve clearance Leakage from intake or exhaust valves Leakage from cylinders
Low	High	Rough idling (Fluctuating HC reading)	Vacuum leaks: PCV hoses Intake manifold Throttle body Brake booster line Lean mixture causing misfire
High	High	Rough idling (Black smoke from exhaust)	Restricted air cleaner filter element Plugged PCV valve Faulty SFI system: Faulty pressure regulator Faulty engine coolant temperature sensor Faulty mass air flow meter Faulty ECM Faulty injectors Faulty throttle body

Problems

Possible Causes

Normal

High

Rough idling

Faulty ignition:

Incorrect timing
Plugs are contaminated or shorted, or gaps are defective

Incorrect valve clearance
Leakage from intake or exhaust valves
Leakage from cylinders

Low

High

Rough idling

(Fluctuating HC reading)

Vacuum leaks:

PCV hoses
Intake manifold
Throttle body
Brake booster line

Lean mixture causing misfire

High

Rough idling

(Black smoke from exhaust)

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

Faulty pressure regulator
Faulty engine coolant temperature sensor
Faulty mass air flow meter
Faulty ECM
Faulty injectors
Faulty throttle body