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1. Faulty ignition
- Incorrect timing
- Fouled, shorted or improperly gapped plugs
- 2. Incorrect valve clearance
- 3. Leaky intake and exhaust valves
- 4. Leaky cylinder
- 5. Faulty EGR
Lexus NX: On-vehicle Inspection
Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (engine Mechanical) / Engine / On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT ENGINE COOLANT
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2. INSPECT ENGINE OIL
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3. INSPECT AUXILIARY BATTERY
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4. INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
(a) Remove the air cleaner cap sub-assembly.
(b) Remove the air cleaner filter element sub-assembly.
(c) Visually check that the air cleaner filter is not excessively damaged or oily.
If necessary, replace the air cleaner filter element sub-assembly.
(d) Install the air cleaner filter element sub-assembly.
(e) Install the air cleaner cap sub-assembly.
5. INSPECT SPARK PLUG
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6. INSPECT FAN AND GENERATOR V BELT
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7. INSPECT VALVE LASH ADJUSTER ASSEMBLY NOISE
(a) Put the engine in inspection mode (maintenance mode).
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(b) Warm up the engine.
(c) Check that the engine does not emit unusual noises.
(d) If unusual noises occur, warm up the engine and idle it for over 30 minutes. Then perform the inspection above again.
HINT:
If any defects or problems are found during the inspection above, check the valve lash adjuster assembly.
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8. INSPECT IGNITION TIMING
(a) Put the engine in inspection mode (maintenance mode).
Click here
(b) Warm up and stop the engine.
(c) Connect the Techstream to the DLC3.
(d) Put the engine in inspection mode (maintenance mode).
Click here
(e) Turn the Techstream on.
(f) Enter the following menus: Powertrain / Engine and ECT / Data List / IGN Advance.
Powertrain > Engine and ECT > Data List| Tester Display |
|---|
| IGN Advance |
Standard ignition timing:
5 to 20° BTDC @ idle
NOTICE:
- Turn all the electrical systems and the A/C off.
- Check the ignition timing with the cooling fans off.
- When checking the ignition timing, the shift lever should be in P.
(g) Check that the ignition timing advances immediately when the engine speed is increased.
(h) Enter the following menus: Powertrain / Engine and ECT / Active Test / Connect the TC and TE1.
Powertrain > Engine and ECT > Active Test| Tester Display |
|---|
| Connect the TC and TE1 |
(i) Monitor IGN Advance of the Data List.
Standard ignition timing:
8 to 12 BTDC @ idle
NOTICE:
- Turn all the electrical systems and the A/C off.
- Check the ignition timing with the cooling fans off.
- When checking the ignition timing, the shift lever should be in P.
(j) Check that the ignition timing advances immediately when the engine speed is increased.
(k) Turn the power switch off.
(l) Disconnect the Techstream from the DLC3.
9. INSPECT ENGINE IDLE SPEED
(a) Put the engine in inspection mode (maintenance mode).
Click here
(b) Warm up and stop the engine.
(c) When using the Techstream:
(1) Connect the Techstream to the DLC3.
(2) Put the engine in inspection mode (maintenance mode).
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(3) Start the engine and run it at idle.
(4) Turn the Techstream on.
(5) Enter the following menus: Powertrain / Engine and ECT / Data List / Engine Speed.
Powertrain > Engine and ECT > Data List| Tester Display |
|---|
| Engine Speed |
Standard idle speed:
950 to 1050 rpm
NOTICE:
- Turn all electrical systems and the A/C off.
- Inspect the idle speed with the cooling fans off.
- When checking the idle speed, the shift lever should be in P.
(6) Disconnect the Techstream from the DLC3.
(d) When not using the Techstream:
| (1) Using SST, connect a tachometer probe to terminal 9 (TAC) of the DLC3. SST: 09843-18030 NOTICE: Confirm the terminal number before connecting the probe. Connecting the wrong terminals can damage the engine. |
|
(2) Put the engine in inspection mode (maintenance mode).
Click here
(3) Start the engine and run it at idle.
(4) Check the idle speed.
Standard idle speed:
950 to 1050 rpm
NOTICE:
- Turn all electrical systems and the A/C off.
- Inspect the idle speed with the cooling fans off.
- When checking the idle speed, the shift lever should be in P.
(5) Disconnect the tachometer probe from the DLC3.
10. INSPECT COMPRESSION
(a) Put the engine in inspection mode (maintenance mode).
Click here
(b) Warm up and stop the engine.
(c) Check for DTCs.
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(d) Remove the 4 spark plugs.
Click here
NOTICE:
DTCs will be stored if the inspection is performed with the ignition coil assembly connectors disconnected. Make sure that the ignition coil assembly connectors are connected during the inspection.
(e) Check the cylinder compression pressure.
(1) Insert a compression gauge into the spark plug hole.
(2) Connect the Techstream to the DLC3.
(3) Turn the power switch on (IG).
(4) Turn the Techstream on.
NOTICE:
Check the HV battery voltage in the Data List to ensure that the battery is fully charged.
(5) Enter the following menus: Powertrain / Hybrid Control / Active Test / Compression Test / ON.
Powertrain > Hybrid Control > Active Test| Tester Display |
|---|
| Compression Test |
(6) Depress and hold the brake pedal, and turn the power switch on (READY).
Standard compression pressure:
1100 kPa (11.2 kgf/cm2, 160 psi) or higher
Minimum compression pressure:
800 kPa (8.2 kgf/cm2, 116 psi)
Pressure difference between each cylinder:
100 kPa (1.0 kgf/cm2, 15 psi) or less
NOTICE:
- Inspect the other cylinders in the same way.
- Measure the compression pressure as quickly as possible.
- Noise may be emitted from the hybrid vehicle transaxle assembly. However, this is not a malfunction.
(7) If the cylinder compression pressure is low, pour a small amount of engine oil into the cylinder through the spark plug hole, then inspect the cylinder compression pressure again.
HINT:
- If adding oil helps boost the compression, it is likely that the piston rings and/or cylinder bore is worn or damaged.
- If the pressure stays low, a valve may be stuck or seated improperly, or there may be leakage from the gasket.
(f) Remove the compression gauge.
(g) Install the 4 spark plugs.
Click here
(h) Clear the DTCs.
Click here
NOTICE:
After the inspection, clear the DTCs, check for DTCs again and make sure the normal system code is output.
11. INSPECT CO/HC
HINT:
This check determines whether or not the idle CO/HC complies with regulations.
(a) Put the engine in inspection mode (maintenance mode).
Click here
(b) Start the engine.
(c) Keep the engine speed at 2500 rpm for approximately 180 seconds.
(d) Insert a CO/HC meter testing probe at least 40 cm (1.31 ft.) into the tailpipe during idling.
(e) Immediately check the CO/HC concentration at idle and at 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 air fuel ratio sensor operation.
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(2) Check the heated oxygen sensor operation.
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(3) See the table below for possible causes, and then inspect and correct the applicable causes if necessary.
| CO | HC | Symptom | Causes |
|---|---|---|---|
| Normal | High | Rough idle | |
| Low | High | Rough idle (Fluctuating HC reading) |
|
| High | High | Rough idle (Black smoke from exhaust) |
|
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