M20C-FKS ENGINE MECHANICAL ENGINE ON-VEHICLE INSPECTION
CAUTION / NOTICE / HINT
- CAUTION:
- ·
When working near the engine room while the engine has started or the power source mode is ignition switch on, do not touch the V-ribbed belt or rotating components such as the fan, etc.
·Touching the V-ribbed belt or rotating components such as the fan, etc. could result in your hand or clothing getting caught and pulled in.
- NOTICE:
-
This procedure includes the removal of small-head bolts. Refer to Small-Head Bolts of Basic Repair Hint to identify the small-head bolts.
PROCEDURE
1.INSPECT ENGINE COOLANT
2.INSPECT ENGINE OIL
3.INSPECT BATTERY CONDITION
19100P
4.INSPECT SPARK PLUG
17801
5.INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
Remove the air cleaner filter element sub-assembly.
Visually check that the air cleaner filter element sub-assembly is not damaged or excessively oily. If necessary, replace the air cleaner filter element sub-assembly.
- HINT:
- ·
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.
Install the air cleaner filter element sub-assembly.
16361A
6.INSPECT V-RIBBED BELT
16620D
7.INSPECT V-RIBBED BELT TENSIONER ASSEMBLY
Remove the V-ribbed belt.
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Turn the V-ribbed belt tensioner assembly clockwise and counterclockwise and check that it turns smoothly and does not catch.
- HINT:
-
If the V-ribbed belt tensioner assembly does not turn smoothly or catches, replace the V-ribbed belt tensioner assembly.
Install the V-ribbed belt.
13750
8.INSPECT VALVE LASH ADJUSTER ASSEMBLY NOISE
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 30 minutes or more, then perform the inspection.
- HINT:
-
If any defects or problems are found during the inspection, perform the valve lash adjuster assembly inspection.
9.INSPECT IGNITION TIMING
- NOTICE:
- ·
Check the ignition timing with the cooling fan off.
·Turn off all electrical systems and the A/C.
·When checking the ignition timing, the transaxle should be in neutral or park.
Warm up and stop the engine.
Connect the GTS to the DLC3.
Start the engine and run it at idle.
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Data List / Ignition Timing Cylinder #1.
- Powertrain > Engine > Data List
-
Tester Display Ignition Timing Cylinder #1 - 50003 372 213
- Standard Ignition Timing:
0 to 15° BTDC at idle
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 - 50004 372 22 213
Monitor Ignition Timing Cylinder #1 of the Data List.
- Standard Ignition Timing:
8 to 12° BTDC at idle
Enter the following menus: Powertrain / Engine / Active Test / Activate the TC Terminal / OFF.
Check that the ignition timing advances immediately when the engine speed is increased.
10.INSPECT ENGINE IDLE SPEED
- NOTICE:
- ·
Check the ignition timing with the cooling fan off.
·Turn off all electrical systems and the A/C.
·When checking the ignition timing, the transaxle should be in neutral or park.
Warm up and stop the engine.
Connect the GTS to the DLC3.
Start the engine and run it at idle.
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Data List / Engine Speed.
- Powertrain > Engine > Data List
-
Tester Display Engine Speed - 50003 372 211
Read the value displayed on the tester.
- Standard Idle Speed:
750 to 850 rpm
11.INSPECT COMPRESSION
- NOTICE:
-
Keep the spark plug holes free of foreign matter when measuring the compression pressure.
Warm up and stop the engine.
Remove the No. 1 engine cover sub-assembly.
Remove the front fender front splash shield RH.
Remove the front fender front splash shield LH.
Remove the No. 2 engine under cover assembly.
Remove the 4 spark plugs.
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Remove the bolt and fuel delivery guard.
Disconnect the fuel injector connector (for Port Injection).
Remove the 2 bolts and disengage the clamp to separate the engine wire.
| *a | Lock Lever |
Detach the claw and raise the lock lever to disconnect the fuel injector connector (for Direct Injection) as shown in the illustration.
Remove the air cleaner assembly with air cleaner hose.
Using an 8 mm socket wrench, remove the 3 bolts to separate the throttle body assembly from the intake manifold.
Remove the throttle body gasket from the intake manifold.
Check the cylinder compression pressure.
Insert a compression gauge into the spark plug hole.
While cranking the engine, measure the compression pressure.
- Standard Compression Pressure:
1400 kPa (14.3 kgf/cm2, 203 psi)
- Minimum Compression Pressure:
1200 kPa (12.2 kgf/cm2, 174 psi)
- Pressure Difference between Each Cylinder:
200 kPa (2.0 kgf/cm2, 29 psi) or less
- NOTICE:
- ·
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.
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.
- HINT:
- ·
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.
| *a | Protrusion |
Install a new throttle body gasket to the intake manifold with the protrusions of the throttle body gasket oriented as shown in the illustration.
Using an 8 mm socket wrench, install the throttle body assembly to the intake manifold with the 3 bolts.
- Torque:
- 10 N*m (102 kgf*cm, 7 ft.*lbf)
| *a | Lock Lever |
Connect the fuel injector connector (for Direct Injection) and push down the lock lever to attach the claw as shown in the illustration.
Attach the clamp and install the engine wire with the 2 bolts.
- Torque:
- 10 N*m (102 kgf*cm, 7 ft.*lbf)
Install the air cleaner assembly with air cleaner hose.
Connect the fuel injector connector (for Port Injection).
Install the 4 spark plugs.
Install the No. 2 engine under cover assembly.
Install the front fender front splash shield LH.
Install the front fender front splash shield RH.
Install the No. 1 engine cover sub-assembly.
Clear the DTCs.
- NOTICE:
-
After the inspection, clear the DTCs, check for DTCs again and make sure the normal system code is output.
12.INSPECT CO/HC
- HINT:
-
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 during idle and when the engine is running at 2500 rpm.
- HINT:
-
When performing a 2 mode (with the engine idling/running at 2500 rpm) test, 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.
See the following table for possible causes, then inspect the applicable parts and repair them if necessary.
| CO | HC | Problem | Cause |
|---|---|---|---|
| Normal | High | Rough idle | 1.
Faulty ignition: -
Incorrect valve timing -
Fouled, shorted or improperly gapped spark plugs 2.
Incorrect valve clearance (valve lash adjuster assembly) 3.
Leaks in intake or exhaust valves 4.
Leaks in cylinders 5.
Faulty EGR |
| Low | High | Rough idle (Fluctuating HC reading) | 1.
Vacuum leaks: -
PCV hoses -
Intake manifold -
Throttle body with motor assembly 2.
Lean mixture causing misfire 3.
Faulty EGR |
| High | High | Rough idle (Black smoke from exhaust) | 1.
Restricted air cleaner filter element sub-assembly 2.
Plugged PCV valve 3.
Faulty SFI systems: -
Fuel pressure regulator assembly -
Engine coolant temperature sensor -
Mass air flow meter -
ECM -
Fuel injector assemblies -
Throttle position sensor (built into throttle body with motor assembly) 4.
Faulty EGR |