Engine
FA20 ENGINE MECHANICAL: ENGINE: ON-VEHICLE INSPECTION; 2013 MY FR-S [03/2012 -]
1. INSPECT ENGINE COOLANT
Testing and Inspection
2. INSPECT ENGINE OIL
Testing and Inspection
3. INSPECT BATTERY
Component Tests and General Diagnostics
4. INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
Intake System
5. INSPECT SPARK PLUG
Testing and Inspection
6. INSPECT V-RIBBED BELT TENSIONER ASSEMBLY
(a) Remove the fan and generator V belt Removal.
(b) Check that nothing gets caught in the tensioner by turning it clockwise and counterclockwise.
If a any malfunction exists, replace the tensioner.
(c) Install the fan and generator V belt Installation.
7. INSPECT IGNITION TIMING
(a) Warm up and stop the engine.
(b) When using the Techstream:
(1) Connect the Techstream to the DLC3.
(2) Start the engine and idle it.
(3) Turn the Techstream on.
(4) Enter the following menus: Powertrain / Engine and ECT / Data List / IGN Advance.
Standard ignition timing:
-5 to 10° BTDC at idle
NOTICE:
* Switch off all the accessories and the A/C before connecting the Techstream.
* When checking the idle speed, the transmission should be in neutral.
HINT
Refer to the Techstream operator's manual for further details.
(5) Check that the ignition timing advances immediately when the engine speed is increased.
(c) When not using the Techstream:
(1) Connect the tester probe of a timing light to the wire of the ignition connector for the No. 1 cylinder.
HINT
Use a timing light that detects the primary current.
(2) Using the timing light, check the ignition timing.
Standard ignition timing:
-5 to 10° BTDC at idle
NOTICE:
When checking the ignition timing, the transmission should be in neutral.
(3) Check that the ignition timing advances immediately when the engine speed is increased.
(4) Disconnect the timing light from the engine.
8. INSPECT ENGINE IDLE SPEED
(a) Warm up and stop the engine.
(b) When using the Techstream:
(1) Connect the Techstream to the DLC3.
NOTICE:
Switch off all the accessories and the A/C before connecting the Techstream.
(2) Race the engine at 2500 rpm for approximately 90 seconds.
(3) Turn the Techstream on.
(4) Enter the following menus: Powertrain / Engine and ECT / Data List / Engine Speed.
Standard Idle Speed:
NOTICE:
When checking the idle speed, the transmission should be in neutral.
HINT
Refer to the Techstream operator's manual for further details.
If the idle speed is not as specified, check the air intake system.
(5) Disconnect the Techstream from the DLC3.
9. INSPECT COMPRESSION
(a) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Remove the relay block cover.
(c) Remove the F/PMP fuse.
(d) Warm up and stop the engine.
(e) Remove the 4 spark plugs Removal.
(f) Insert a compression gauge into the spark plug hole.
(g) Inspect the cylinder compression pressure.
(1) While cranking the engine, measure the compression pressure.
HINT
Always use a fully charged battery to obtain an engine speed of 250 rpm or more.
NOTICE:
The measurement must be performed as quickly as possible.
Standard compression pressure:
1750 kPa (17.8 kgf/cm2, 254 psi) or higher
Minimum pressure:
1150 kPa (11.7 kgf/cm2, 167 psi)
Difference between each cylinder:
200 kPa (2.0 kgf/cm2, 29 psi) or less
HINT
If the cylinder compression is low, pour a small amount of engine oil into the cylinder through the spark plug hole and inspect the compression again. Then perform the 2 steps above for the cylinders with low compression.
* If adding oil increases the compression, the piston rings and/or cylinder bore may be worn or damaged.
* If the pressure stays low, a valve may be stuck or seated improperly, or there may be leakage from the gasket.
(h) Install the 4 spark plugs Installation.
(i) Reinstall the F/PMP fuse.
(j) Install the relay block cover.
(k) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
10. INSPECT CO/HC
HINT
This check is for determining whether or not the idle CO/HC complies with regulations.
(a) Start the engine.
(b) Maintain the engine speed at 2500 rpm for approximately 180 seconds.
(c) Insert a CO/HC meter testing probe at least 40 cm (1.31 ft) into the tailpipe during idling.
(d) Immediately check the CO/HC concentration at idle and/or 2500 rpm.
HINT
* When performing the 2 mode (2500 rpm and idle) test, follow the measurement order prescribed by the applicable local regulations.
* If the CO/HC concentration does not comply with regulations, troubleshoot in the order given below.
(1) Check the A/F sensor Air Fuel Ratio Sensor and heated oxygen sensor Heated Oxygen Sensor operation.
(2) Refer to the table below for the possible cause, and then inspect and correct the applicable causes if necessary.
