Engine: Testing and Inspection
3MZ-FE ENGINE MECHANICAL: ENGINE:
ON-VEHICLE INSPECTION
1. INSPECT COOLANT (for Engine) Testing and Inspection
2. INSPECT ENGINE OIL Testing and Inspection
3. INSPECT BATTERY
Standard specific gravity:
1.25 to 1.29 at 20°C (68°F)
4. INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
(a) Remove the air cleaner filter element from the air cleaner case.
(b) Visually check that there is no dirt, clog, and damage to the air cleaner filter element.
HINT:
- If there is any dirt or a clog on the air cleaner filter element, clean it with compressed air.
- If any dirt or a clog remains even after cleaning the air cleaner filter element with compressed air, replace it.
5. INSPECT SPARK PLUG Inspection
6. INSPECT IGNITION TIMING
(a) Set the vehicle to inspection mode Service Precautions.
(b) Warm up the engine.
(c) When using the Techstream:
(1) Connect the Techstream to the DLC3.
(2) Select the following menu items: Power Train / Engine and ECT / Data List / IGN Advance
Ignition timing:
8 to 12° BTDC
NOTICE:
- Turn all the electrical systems off.
- Inspect the engine idle speed with the cooling fan off.
HINT: Refer to the Techstream operator's manual if you need help to select DATA LIST.
(3) Check that the ignition timing advances immediately when the engine speed is increased.
(d) When not using the Techstream:
(1) Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3.
SST: 09843-18040
NOTICE:
- Make sure of the terminal numbers before connecting them. Connection with a wrong terminal can damage the engine.
- Turn off all electrical systems before connecting the terminals.
- Perform this inspection after the cooling fan motor is turned off.
(2) Pull out the red-colored wire harness as shown in the illustration.
(3) Connect the tester terminal of the timing light to the engine.
NOTE: Use a timing light which detects the first signal.
(4) Inspect ignition timing at idle.
Ignition timing:
8 to 12° BTDC
NOTE: When checking the ignition timing, the transmission is in neutral.
HINT: Run the engine at 1,000 to 1,300 rpm for 5 seconds, check that the engine rpm returns to idle speed.
(5) Disconnect terminals 13 (TC) and 4 (CG) of the DLC3.
(6) Inspect ignition timing at idle.
Ignition timing:
7 to 24° BTDC
(7) Confirm that the ignition timing advances when the engine rpm is increased.
(8) Remove the timing light.
7. INSPECT ENGINE IDLE SPEED
(a) Set the vehicle to inspection mode Service Precautions.
(b) Warm up the engine.
(c) Connect the Techstream to the DLC3.
(d) Enter DATA LIST MODE on the Techstream.
Idle speed:
850 to 950 rpm.
NOTICE:
- When checking the idle speed, the transmission is in neutral.
- Check the idle speed with the cooling fan off.
- Switch off all accessories and air conditioning before connecting the Techstream.
HINT: Refer to the Techstream operator's manual for further details.
8. INSPECT COMPRESSION
(a) Set the vehicle to inspection mode Service Precautions.
(b) Warm up and stop the engine.
(c) Remove the intake air surge tank Removal.
NOTE: If the throttle body connector is disconnected because the DTC is detected in inspection, always reconnect it.
(d) Disconnect the injector connectors.
(e) Remove the ignition coils.
NOTE: If the ignition coil assembly connector is disconnected because the DTC is detected in inspection, always reconnect it.
(f) Remove the spark plugs.
(g) Inspect cylinder compression pressure.
(1) Insert a compression gauge into the spark plug hole.
(2) Connect the Techstream to the DLC3.
NOTE: Check the fully charged battery to indicate HV battery voltage in ECU data monitor.
(3) Enter ACTIVE TEST MODE on the Techstream.
(4) While cranking the engine, measure the compression pressure.
Compression pressure:
0.98 MPa (10 kgf/cm2, 142 psi)
Minimum pressure:
0.74 MPa (7.5 kgf/cm2, 107 psi)
Difference between each cylinder:
100 kPa (1.0 kgf/cm2, 15 psi)
NOTICE:
- Check other cylinder's compression pressure in the same way.
- This measurement must be done as quickly as possible.
- After performing all the procedures, be sure to clear DTCs stored in the the memory. Then, check that the normal system code is output.
(5) If the cylinder compression is low, pour a small amount of engine oil into the cylinder through the spark plug hole and inspect again.
HINT:
- If adding oil increases the compression, the piston rings and/or cylinder bore may be worn or damaged.
- If pressure stays low, a valve may be stuck or seated improperly, or there may be leakage past the gasket.
9. INSPECT CO/HC
(a) Set the vehicle to inspection mode Service Precautions.
(b) Start the engine.
(c) Run the engine at 2,500 rpm for approximately 180 seconds.
(d) Insert the CO/HC meter testing probe at least 40 cm (1.3 ft) into the tailpipe during idling.
(e) Check CO/HC concentration at idle and/or 2,500 rpm.
HINT: When doing the 2 mode (with the engine is in the idle and 2,500 rpm) test, the measuring procedures are prescribed by the applicable local regulations.
If the CO/HC concentration does not comply with regulations, troubleshoot in the order given below.
(1) Check heated oxygen sensor operation Heated Oxygen Sensor.
(2) Check heated air fuel ratio sensor operation Air Fuel Ratio Sensor.
(3) See the table below for possible causes, and then inspect and repair the applicable causes if necessary.
