Engine: Testing and Inspection
INSPECTION1. INSPECT COOLANT
2. INSPECT ENGINE OIL
3. INSPECT BATTERY
4. INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSY
5. INSPECT SPARK PLUG
6. INSPECT IGNITION TIMING
a. Warm up engine.
b. When using hand-held tester or OBDII scan tool.
1 Connect the hand-held tester or OBDII scan tool to the DLC3.
HINT: Please refer to the hand-held tester or OBDII scan tool operator's manual for further details.
c. When not using hand-held tester or OBDII scan tool.
1 Using SST connect terminals 13 (TC) and 4 (CG) of DLC3.
SST 09843-18040
NOTICE:
^ Be sure not to connect incorrectly. It causes breakage of the engine.
^ Turn OFF all electrical systems.
^ Operate the inspection when the cooling fan motor is turned OFF.
2 Remove the 3 bolts, the nut and the cylinder head cover No. 2.
3 Pull out the wire harness as shown in the illustration.
4 Connect timing light to engine.
NOTICE:
^ Use a timing light which can detect the first signal.
^ After checking, be sure to tape the wire harness.
5 Inspect ignition timing at idle.
Ignition timing: 8 - 12° BTDC
NOTICE: When checking the ignition timing, the transmission is at neutral position.
HINT: After engine rpm is kept at 1,000 - 1,300 rpm for 5 seconds, check that it returns idle speed.
6 Disconnect the terminal 13 (TC) and 4 (CG) of the DLC3.
7 Inspect ignition timing at idle.
Ignition timing:
M/T 4 - 12° BTDC
8 Confirm that ignition timing moves to advanced angle side when the engine rpm is increased.
9 Remove the timing light.
10 Install cylinder head cover No. 2 with the 3 bolts and the nut.
Torque: 7.0 Nm (71 kgf-cm, 62 inch lbs.)
7. INSPECT ENGINE IDLE SPEED
a. Warm up engine.
b. When using hand-held tester or OBDII scan tool.
1 Connect the hand-held tester or OBDII scan tool to the DLC3.
HINT: Please refer to the hand-held tester or OBDII scan tool operator's manual for further details.
c. Check the idle speed.
Idle speed:
M/T 750 - 850 rpm
NOTICE:
^ Check idle speed with cooling fan OFF.
^ Switch off all accessories and air conditioning.
SST 09843-18040
8. INSPECT COMPRESSION
a. Warm up and stop engine.
b. Remove ignition coil.
c. Remove spark plugs.
d. Inspect cylinder compression pressure.
SST 09992-00500
1 Insert a compression gauge into the spark plug hole.
2 Fully open the throttle.
3 While cranking the engine, measure the compression pressure.
NOTICE:
^ Always use a fully charged battery to obtain engine speed of 250 rpm or more.
^ Check other cylinder's compression pressure in the same way.
^ This measurement must be done in as short a time as possible.
Compression pressure: 1,400 kPa (14.3 kgf/cm2, 203 psi)
Minimum pressure: 1,000 kPa (10.3 kgf/cm2, 145 psi)
Difference between each cylinder: 110 kPa (1.1 kgf/cm2, 16 psi)
4 If the cylinder compression in one more cylinders is low, pour a small amount of engine oil into the cylinder through the spark plug hole and repeat steps 1 through 3 for cylinders with low compression.
^ If adding oil helps the compression, it is likely that the piston rings and/or cylinder bore are worn or damaged.
^ If pressure stays low, a valve may be sticking or seating is improper, or there may be leak age past the gasket.
9. INSPECT CO/HC
a. Start engine.
b. Race engine at 2,500 rpm for approximately 180 seconds.
c. Insert CO/HC meter testing probe at least 40 cm (1.3 ft.) into tailpipe during idling.
d. Immediately check CO/HC concentration at idle and/or 2,500 rpm.
HINT:
^ Complete the measuring within 3 minutes.
^ When doing the 2 mode (idle and 2,500 rpm) test, these measuring orders are prescribed by the applicable local regulations.
e. If the CO/HC concentration does not comply with regulations, troubleshoot in the order given.
1 Check heated oxygen sensor operation.