On-Vehicle Inspection [10/2022 - ]: Procedure

Refer to ON-VEHICLE INSPECTION [10/2022 - ]

Refer to ON-VEHICLE INSPECTION [10/2022 - 11/2023] , or refer to ON-VEHICLE INSPECTION [11/2023 - ]

Refer to ON-VEHICLE INSPECTION [10/2022 - ]

Refer to ON-VEHICLE INSPECTION [10/2022 - ]

1. Remove the air cleaner filter element sub-assembly.
2. Visually check that the air cleaner filter element sub-assembly is not damaged or excessively oily.

   HINT: 

   • If there is any dirt or clogs in the air cleaner filter element sub-assembly, clean it with compressed air.
   • If any dirt or clogs remain even after cleaning the air cleaner filter element sub-assembly with compressed air, replace it.
3. Install the air cleaner filter element sub-assembly.

See step  1

1. Remove the V-ribbed belt.

   Refer to REMOVAL [10/2022 - ]

2. Turn the V-ribbed belt tensioner assembly clockwise and counterclockwise and check that it turns smoothly and does not catch.

   HINT: 

   If the V-ribbed belt tensioner assembly does not turn smoothly or catches, replace the V-ribbed belt tensioner assembly.

3. Install the V-ribbed belt.

   Refer to INSTALLATION [10/2022 - ]

1. Rev up the engine several times. Check that the engine does not emit unusual noises.
2. If unusual noises occur, warm up the engine and idle it for 30 minutes or more, then perform the inspection.
3. If any defects or problems are found during the inspection, perform the valve lash adjuster assembly inspection.

   Refer to PROCEDURE - Step 2

1. Start the engine and run it at idle.
2. Read the value displayed on the GTS.

   Powertrain > Engine > Data List 

   Tester Display
   Ignition Timing Cylinder #1

   Standard Ignition Timing

   -5 to 15° BTDC at idle

3. Check that the ignition timing advances immediately when the engine speed is increased.
4. Read the value displayed on the GTS.

   Powertrain > Engine > Active Test 

   Active Test Display
   Activate the TC Terminal

   Data List Display
   Ignition Timing Cylinder #1

   Standard Ignition Timing

   8 to 12° BTDC at idle

1. Start the engine and run it at idle.
2. Read the value displayed on the tester.

   Powertrain > Engine > Data List 

   Tester Display
   Engine Speed

   Standard Idle Speed

   650 to 750 rpm

1. Warm up and stop the engine.
2. Check for DTCs.

   Refer to DTC CHECK / CLEAR [10/2022 - 11/2023] , or refer to DTC CHECK / CLEAR [11/2023 - ]

3. Remove the 4 ignition coil assemblies and 4 spark plugs.

   Refer to REMOVAL [10/2022 - ]

4. Disconnect the 4 direct fuel injector assembly connectors and No. 5 engine wire connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

5. Check the cylinder compression pressure.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   1. Insert a compression gauge into the spark plug hole.
   2. While cranking the engine, measure the compression pressure.

      Standard Compression Pressure

      1200 kPa (12.2 kgf/cm² , 174 psi)

      Minimum Compression Pressure

      1000 kPa (10.2 kgf/cm² , 145 psi)

      Pressure Difference between Each Cylinder

      200 kPa (2.0 kgf/cm² , 29 psi) or less

      NOTE:

      • Always use a fully charged battery to obtain an engine speed of 250 rpm or more.
      • Measure the compression pressure as quickly as possible.
   3. If the cylinder compression pressure is low, pour a small amount of engine oil into the cylinder through the spark plug hole and inspect it again.

      HINT: 

      • If adding engine oil increases the compression pressure, the piston rings and/or cylinder bore may be worn or damaged.
      • If the compression pressure stays low, a valve may be stuck or seated improperly, or there may be leaks in the cylinder head gasket.
6. Connect the 4 direct fuel injector assembly connectors and No. 5 engine wire connector.
7. Install the 4 ignition coil assemblies and 4 spark plugs.

   Refer to INSTALLATION [10/2022 - ]

8. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [10/2022 - 11/2023] , or refer to DTC CHECK / CLEAR [11/2023 - ]

   NOTE:

   After the inspection, clear the DTCs, check for DTCs again and make sure the normal system code is output.

HINT: 

This check determines whether or not the idle CO/HC complies with regulations.

1. Start the engine.
2. Run the engine at 2500 rpm for approximately 180 seconds.
3. Insert a CO/HC meter testing probe at least 40 cm (1.31 ft.) into the tailpipe during idle.
4. Immediately check the CO/HC concentration during idle and when the engine is running at 2500 rpm.

   HINT: 

   When performing a 2 mode (with the engine idling/running at 2500 rpm) test, the measurement procedures are determined by applicable local regulations.

   If the CO/HC concentration does not comply with the regulations, perform troubleshooting in the order given below.

   1. Check for DTCs.

      Refer to DTC CHECK / CLEAR [10/2022 - 11/2023] , or refer to DTC CHECK / CLEAR [11/2023 - ]

   2. See the following table for possible causes, then inspect the applicable parts and repair them if necessary.

      CO	HC	Problem	Cause
      Normal	High	Rough idle	Faulty ignition: Incorrect valve timing Fouled, shorted or improperly gapped spark plugs Incorrect valve clearance (valve lash adjuster assembly) Leaks in intake or exhaust valves Leaks in cylinders
      Low	High	Rough idle (Fluctuating HC reading)	Vacuum leaks: PCV hoses Intake manifold Throttle body with motor assembly Lean mixture causing misfire
      High	High	Rough idle (Black smoke from exhaust)	Restricted air cleaner filter element sub-assembly Plugged PCV valve Faulty SFI systems: Fuel pressure regulator assembly Engine coolant temperature sensor Mass air flow meter sub-assembly ECM Fuel injector assemblies Throttle position sensor (built into throttle body with motor assembly)