Engine: Testing and Inspection
INSPECTION1. INSPECT ENGINE COOLANT
2. INSPECT ENGINE OIL
3. INSPECT BATTERY SPECIFIC GRAVITY
4. INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
5. INSPECT FAN AND GENERATOR V BELT
HINT: Use of the automatic tensioner makes the measurements of tension and flexibility unnecessary.
6. INSPECT V-RIBBED BELT TENSIONER ASSEMBLY
7. WARM UP ENGINE
8. INSPECT IGNITION TIMING
a. 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 Please refer to the hand-held tester or OBD II scan tool operator's manual for further details.
Ignition timing: 7 to 24° BTDC at idle (Transmission in neutral)
3 Disconnect the hand-held tester or OBD II scan tool from the DLC3.
b. When not using the hand-held tester or OBD II scan tool.
1 Remove the air cleaner cap sub-assembly.
2 Connect the tester probe of a timing light to the wire of the ignition coil connector for the No.1 cylinder.
3 Using SST, connect the terminals TC and CG of the DLC3.
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4 Using the timing light, check the ignition timing.
Ignition timing: 10 ± 2° BTDC at idle (Transmission in neutral)
5 Remove the SST from the DLC3.
6 Check the ignition timing.
Ignition timing: 7 to 24° BTDC at idle (Transmission in neutral)
7 Disconnect the timing light from the engine.
8 Install the air cleaner cap sub-assembly.
9. INSPECT ENGINE IDLE SPEED
a. 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 Please refer to the hand-held tester or OBD II scan tool operator's manual for further details.
3 Switch the air conditioning OFF.
4 Race the engine at 2,500 rpm for approx. 90 seconds.
5 Check the idle speed.
Idle speed: 700 ± 50 rpm (Transmission in neutral)
If the idle speed is not as specified, check the air intake system.
6 Disconnect the hand-held tester or OBD II scan tool from the DLC3.
b. When not using the hand-held tester or OBD II scan tool.
1 Using SST, connect the tachometer probe to terminal TAC of the DLC3.
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2 Switch the air conditioning OFF.
3 Race the engine at 2,500 rpm for approx. 90 seconds.
4 Check the idle speed.
Idle speed: 700 ± 50 rpm (Transmission in neutral)
If the idle speed is not as specified, check the air intake system.
5 Disconnect the tachometer from the DLC3.
10. INSPECT COMPRESSION
a. Remove the V-bank cover.
b. Remove the air cleaner assembly.
c. Remove the intake air surge tank.
d. Remove the 6 ignition coils.
e. Remove the 6 spark plugs.
f. Disconnect the 6 injector connectors.
g. Inspect the cylinder compression pressure.
1 Insert a compression gauge into the spark plug hole.
2 Fully open the throttle by hand.
3 While cranking the engine, measure the compression pressure.
HINT: Always use a fully charged battery to obtain engine speed of 250 rpm or more.
4 Repeat steps through (1) to (3) for each cylinder.
NOTICE: This measurement must be done as quickly as possible.
Compression pressure: 1.3 MPa (13.3 kgf/cm2, 189 psi) or more
Minimum pressure: 1.0 MPa (10.2 kgf/cm2, 145 psi)
Difference between each cylinder: 0.1 MPa (1.0 kgf/cm2, 15 psi) or less
5 If the cylinder compression 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 through (1) to (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 a leakage through the gasket.
h. Connect the 6 injector connectors.
i. Install the 6 spark plugs.
j. Install the 6 ignition coils.
k. Install the intake air surge tank.
l. Install the air cleaner assembly.
m. Install the V-bank cover.
11. INSPECT CO/HC
HINT: This check is to determine whether or not the idle CO/HC complies with regulations.
a. Start the engine.
b. Keep the engine speed at 2,500 rpm for approx. 180 seconds.
c. Insert CO/HC meter testing probe at least 40 cm (1.3 ft.) into the tailpipe during idling.
d. Immediately check CO/HC concentration at idle and/or 2,500 rpm.
HINT: When performing the 2 mode (2,500 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.
1 Check the A/F sensor and heated oxygen sensor operation.
2 See the table for possible causes, then inspect and correct the applicable causes if necessary.