On-Vehicle Inspection [10/2020 - ]: Procedure

Refer to ON-VEHICLE INSPECTION [12/2017 - ]

Refer to ON-VEHICLE INSPECTION [12/2017 - ]

Refer to ON-VEHICLE INSPECTION [10/2020 - 10/2022] , or refer to ON-VEHICLE INSPECTION [10/2022 - 10/2023] , or refer to ON-VEHICLE INSPECTION [10/2023 - ]

Refer to ON-VEHICLE INSPECTION [12/2017 - ]

1. Remove the air cleaner filter element sub-assembly.
2. Visually check that there is no dirt, blockage, and/or damage to the air cleaner filter element sub-assembly.

   HINT: 

   • If there is any dirt or a blockage in the air cleaner filter element sub-assembly, clean it with compressed air.
   • If any dirt or a blockage remains 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. Rev up the engine several times. Check that the engine does not emit unusual noises.

   If unusual noises occur, warm up the engine and idle it for over 30 minutes. Then perform the inspection above again.

   If any defects or problems are found during the inspection above, perform a valve lash adjuster inspection.

1. Warm up the engine and stop the engine.
   NOTE:

   A warmed up engine should have an engine coolant temperature of over 80°C (176°F), and an engine oil temperature of 60°C (140°F), and the engine speed should be stabilized.

2. Connect the Techstream to the DLC3.
3. Enter the following menus: Powertrain / Engine / Data List / Ignition Timing Cylinder #1.

   Powertrain > Engine > Data List 

   Tester Display
   Ignition Timing Cylinder #1

4. Monitor Ignition Timing Cylinder #1 of the Data List.

   Standard ignition timing

   8 to 25° BTDC at idle

   NOTE:

   • Check the ignition timing with the cooling fans off.
   • Turn off all the electrical systems and the A/C.
   • When checking the ignition timing, the transmission should be in park.
5. Enter the following menus: Powertrain / Engine / Active Test / Activate the TC Terminal / ON.

   Powertrain > Engine > Active Test 

   Active Test Display
   Activate the TC Terminal

   Data List Display
   Ignition Timing Cylinder #1

6. Monitor Ignition Timing Cylinder #1 of the Data List.

   Standard ignition timing

   8 to 12° BTDC at idle

7. Disconnect the Techstream from the DLC3.
8. Check that the ignition timing advances immediately when the engine speed is increased.

1. Warm up and stop the engine.
2. Connect the Techstream to the DLC3.
3. Enter the following menus: powertrain / Engine / Data list / Engine Speed.

   Powertrain > Engine > Data List 

   Tester Display
   Engine Speed

4. Read the value displayed on the Techstream.

   Standard idle speed

   600 to 800 rpm

   NOTE:

   • Check the idle speed with the cooling fans off.
   • Turn off all the electrical systems and the A/C.
   • When checking the idle speed, the transmission should be in park.
5. Disconnect the Techstream from the DLC3.

1. Warm up and stop the engine.
   NOTE:

   A warmed up engine should have an engine coolant temperature of over 80°C (176°F) and an engine oil temperature of 60°C (140°F), and the engine speed should be stabilized.

2. Connect the Techstream to the DLC3.
3. Check for DTCs.

   Refer to DTC CHECK / CLEAR [10/2020 - 10/2023] , or refer to DTC CHECK / CLEAR [10/2023 - ]

4. Disconnect the 4 connectors.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

5. Remove the 6 spark plugs.

   Refer to REMOVAL [12/2017 - ]

6. Inspect compression pressure.
   1. Insert a compression gauge into the spark plug hole.
   2. Depress and hold the brake pedal, and turn the engine switch on (IG). Then check the compression pressure.

      Standard Compression Pressure

      1300 kPa (13.3 kgf/cm² , 189 psi)

      Minimum Compression Pressure

      980 kPa (10.0 kgf/cm² , 142 psi)

      Pressure Difference between Each Cylinder

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

      NOTE:

      • Inspect all cylinders in the same way.
      • 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 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.
7. Install the 6 spark plugs.

   Refer to INSTALLATION [12/2017 - ]

8. Connect the 4 connectors.
9. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [10/2020 - 10/2023] , or refer to DTC CHECK / CLEAR [10/2023 - ]

   NOTE:

   After performing the inspection, clear the DTCs and confirm that DTCs are not stored again or that the normal system code is output if using a check wire.

HINT: 

This is a check for determining whether or not the idle CO / HC complies with regulations.

1. Keep the engine speed at 2500 rpm for approx. 180 seconds.
2. Insert the CO / HC meter testing probe at least 40 cm (1.31 ft.) into the tailpipe during idling.
3. Immediately check CO / HC concentration at idle and/or 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 DTCs.

      Refer to DTC CHECK / CLEAR [10/2020 - 10/2023] , or refer to DTC CHECK / CLEAR [10/2023 - ]

   2. See the table below for possible causes, then inspect and correct the applicable causes if necessary.

      CO	HC	Symptom	Causes
      Normal	High	Rough idle	Faulty ignitions Incorrect timing Fouled, shorted or improperly gapped plugs Incorrect valve clearance (valve lash adjuster assembly) Leaky intake and exhaust valves Leaky cylinder
      Low	High	Rough idle (Fluctuating HC reading)	Vacuum leaks PCV hose Intake manifold Throttle body with motor assembly Lean mixture causing misfire
      High	High	Rough idle (Black smoke from exhaust)	Restricted air filter Faulty fuel SFI system Faulty fuel pressure Defective engine coolant temperature sensor Faulty ECM Faulty fuel injector assembly Faulty throttle position sensor (built into throttle with motor body assembly) Faulty mass air flow meter