Engine: Testing and Inspection
INSPECTION1. INSPECT COOLANT
2. INSPECT ENGINE OIL
3. INSPECT BATTERY
4. INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
5. INSPECT SPARK PLUG
6. INSPECT IGNITION TIMING
NOTICE:
^ Turn all electrical systems OFF.
^ Inspect the ignition timing with the cooling fan OFF.
a) Warm up engine.
b) When using the hand-held tester or OBD II scan tool.
NOTICE: Be sure not to connect connector incorrectly. It causes breakage of the engine.
1) Turn the ignition switch to ON.
2) Select the following menu the items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / IGN ADVANCE
Ignition timing: 4 to 12° CA BTDC (at idle)
HINT: Refer to the hand-held tester operator's manual for further information regarding the selection of DATA LIST.
3) Check that the ignition timing advances immediately when the engine speed is increased.
c) When not using the hand-held tester or OBD II scan tool.
NOTICE: Be sure not to connect SST incorrectly. It causes breakage of the engine.
1) Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3.
SST 09843-18040
2) Remove the 3 bolts and nut, then remove the cylinder head cover No. 2.
3) Pull out the wire harness as shown in the illustration.
4) Connect the clip of the timing light to the engine.
NOTICE:
^ Use a timing light which can detect the first signal.
^ After checking, be sure to tape the wire harness.
5) Inspect the ignition timing during idling.
Ignition timing: 8 to 12° BTDC
NOTICE: When checking the ignition timing, the transmission is at the neutral position.
HINT: After the engine speed is kept at 1,000 to 1,300 rpm for 5 seconds, check that it returns to the idling speed.
6) Disconnect the terminals 13 (TC) and 4 (CG) of the DLC3.
7) Inspect the ignition timing during idling.
Ignition timing: 4 to 12° BTDC
8) Confirm that the ignition timing moves to the advance angle side when the engine speed is increased.
9) Remove the timing light.
10) Reinstall the cylinder head cover No. 2 with the 3 bolts and nut.
Torque: 7.0 Nm (71 kgf-cm, 62 inch lbs.)
7. INSPECT ENGINE IDLING SPEED
a) Warm up the engine.
b) When using the hand-held tester or OBD II scan tool.
1) Connect the hand-held tester or OBD II scan tool to the DLC3.
2) Ignition switch to ON.
3) Select the following menu items:
DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / ENGINE SPD
Idling speed: 750 to 850 rpm
NOTICE:
^ Turn all the electrical systems OFF.
^ Inspect the engine idling speed with the cooling fan OFF.
HINT: Refer to the hand-held tester operator's manual for further information regarding the selection of DATA LIST.
8. INSPECT COMPRESSION
a) Warm up and stop the engine.
b) Remove the ignition coil.
c) Remove the spark plugs.
d) Inspect the 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.
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)
NOTICE:
^ 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 pressure in one or 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 pressure.
^ If adding oil increases the compression, the piston rings and/or cylinder bore may be worn or dam aged.
^ If the pressure stays low, the valve may be stuck or seated improperly, or there may be leakage from the gasket.
9. INSPECT CO/HC
a) Start the engine.
b) Run the engine at 2,500 rpm for approximately 180 seconds.
c) Insert the CO/HC meter testing probe at least 40 cm (1.3 ft.) into tailpipe during idling.
d) Immediately check the CO/HC concentration while idling and/or at 2,500 rpm.
HINT:
^ Complete the measurement within 3 minutes.
^ When doing the 2 modes (idle and 2,500 rpm) test, the measurement orders are prescribed by the applicable local regulations.
e) If the CO/HC concentration does not comply with regulations, troubleshoot in the order given below.
1) Check the heated oxygen sensor operation.