Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000027CSA
Model Year Start: 2023 Model: Corolla Hatchback Prod Date Range: [09/2022 - 11/2022]
Title: M20A-FKS (ENGINE MECHANICAL): ENGINE: ON-VEHICLE INSPECTION; 2023 MY Corolla Corolla Hatchback [09/2022 - 11/2022]

ON-VEHICLE INSPECTION

CAUTION / NOTICE / HINT

CAUTION:

To prevent injury due to contact with an operating V-ribbed belt or cooling fan, keep your hands and clothing away from the V-ribbed belt and cooling fans when working in the engine compartment with the engine running or the engine switch on (IG).

PROCEDURE

1. INSPECT ENGINE COOLANT

Click here 2020 - 2025 MY Corolla Corolla Hatchback [09/2019 -        ]; M20A-FKS (COOLING): COOLING SYSTEM: ON-VEHICLE INSPECTION

2. INSPECT ENGINE OIL

Click here 2019 - 2023 MY Corolla Corolla Hatchback [06/2018 - 08/2023]; M20A-FKS (LUBRICATION): LUBRICATION SYSTEM: ON-VEHICLE INSPECTION

3. INSPECT BATTERY CONDITION

Click here 2023 - 2025 MY Corolla Corolla Hatchback [09/2022 -        ]; M20A-FKS (BATTERY / CHARGING): CHARGING SYSTEM: ON-VEHICLE INSPECTION

4. INSPECT SPARK PLUG

Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; M20A-FKS (ENGINE CONTROL): IGNITION SYSTEM: ON-VEHICLE INSPECTION

5. INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY

Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; MAINTENANCE: M20A-FKS AIR CLEANER FILTER ELEMENT: REMOVAL+

6. INSPECT V-RIBBED BELT

Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; M20A-FKS (ENGINE MECHANICAL): DRIVE BELT: ON-VEHICLE INSPECTION+

7. INSPECT V-RIBBED BELT TENSIONER ASSEMBLY

(a) Remove the V-ribbed belt.

Click here 2020 - 2025 MY Corolla Corolla Hatchback [01/2019 -        ]; MAINTENANCE: M20A-FKS DRIVE BELT: REMOVAL

(b) 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.

(c) Install the V-ribbed belt.

Click here 2020 - 2025 MY Corolla Corolla Hatchback [01/2019 -        ]; MAINTENANCE: M20A-FKS DRIVE BELT: INSTALLATION

8. INSPECT VALVE LASH ADJUSTER ASSEMBLY NOISE

(a) Rev up the engine several times. Check that the engine does not emit unusual noises.

(b) If tappet noise is heard, perform the following procedure.

(1) Idle the engine for at least 10 minutes and then stop the engine.

(2) Remove the fuel pump assembly (for High Pressure).

Click here 2023 MY Corolla Corolla Hatchback [09/2022 - 11/2022]; M20A-FKS (FUEL): FUEL PUMP (for High Pressure): REMOVAL

(3) Remove the ignition coil assembly.

Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; M20A-FKS (ENGINE CONTROL): IGNITION COIL AND SPARK PLUG: REMOVAL

(4) Remove the camshaft position sensor (for Intake Side).

Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; M20A-FKS (ENGINE CONTROL): CAMSHAFT POSITION SENSOR: REMOVAL+

(5) Remove the camshaft position sensor (for Exhaust Side).

Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; M20A-FKS (ENGINE CONTROL): CAMSHAFT POSITION SENSOR: REMOVAL+

(6) Disconnect the air fuel ratio sensor connector.

(7) Disengage the 3 clamps.

(8) Remove the cylinder head cover sub-assembly.

Click here 2019 - 2023 MY Corolla Corolla Hatchback [06/2018 - 03/2023]; M20A-FKS (ENGINE MECHANICAL): ENGINE UNIT: DISASSEMBLY+

(9) Push the pivot of the No. 1 valve rocker arm sub-assembly.

*1

No. 1 Valve Rocker Arm Sub-assembly

*2

Valve Lash Adjuster Assembly

*3

Valve Stem Cap

*a

Pivot

Push

OK:

The plunger is very difficult to move.

HINT:

If the plunger is easy to move, replace the valve lash adjuster assembly.

(10) Install the cylinder head cover sub-assembly.

Click here 2019 - 2023 MY Corolla Corolla Hatchback [06/2018 - 03/2023]; M20A-FKS (ENGINE MECHANICAL): ENGINE UNIT: REASSEMBLY+

(11) Engage the 3 clamps.

(12) Connect the air fuel ratio sensor connector.

(13) Connect the camshaft position sensor (for Exhaust Side) connector.

(14) Connect the camshaft position sensor (for Intake Side) connector.

(15) Install the ignition coil assembly.

Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; M20A-FKS (ENGINE CONTROL): IGNITION COIL AND SPARK PLUG: INSTALLATION

(16) Install the fuel pump assembly (for High Pressure).

Click here 2023 - 2025 MY Corolla Corolla Hatchback [09/2022 -        ]; M20A-FKS (FUEL): FUEL PUMP (for High Pressure): INSTALLATION

9. INSPECT IGNITION TIMING

NOTICE:

  • Check the ignition timing with the cooling fan off.
  • Turn off all electrical systems and the A/C.
  • When checking the ignition timing, the transaxle should be in neutral or park.

(a) Warm up and stop the engine.

(b) Connect the Techstream to the DLC3.

(c) Start the engine and run it at idle.

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Engine / Data List / Ignition Timing Cylinder #1.

Powertrain > Engine > Data List

Tester Display

Ignition Timing Cylinder #1

Standard Ignition Timing:

for CVT: -3 to 3° BTDC at idle

for Manual Transaxle: 3 to 9° BTDC at idle

(f) 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

(g) Monitor Ignition Timing Cylinder #1 of the Data List.

Standard Ignition Timing:

8 to 12° BTDC at idle

(h) Enter the following menus: Powertrain / Engine / Active Test / Activate the TC Terminal / OFF.

(i) Check that the ignition timing advances immediately when the engine speed is increased.

10. INSPECT ENGINE IDLE SPEED

NOTICE:

  • Check the engine idle speed with the cooling fan off.
  • Turn off all electrical systems and the A/C.
  • When checking the engine idle speed, the transaxle should be in neutral or park.

(a) Warm up and stop the engine.

(b) Connect the Techstream to the DLC3.

(c) Start the engine and run it at idle.

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Engine / Data List / Engine Speed.

Powertrain > Engine > Data List

Tester Display

Engine Speed

(f) Read the value displayed on the tester.

Standard Idle Speed:

for CVT

750 to 850 rpm

for Manual Transaxle

600 to 700 rpm

11. INSPECT COMPRESSION

NOTICE:

Keep the spark plug holes free of foreign matter when measuring the compression pressure.

(a) Warm up and stop the engine.

(b) Check for DTCs.

Click here 2023 MY Corolla Corolla Hatchback [09/2022 - 11/2022]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

(c) Remove the 4 spark plugs.

Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; MAINTENANCE: M20A-FKS SPARK PLUG: REMOVAL

(d) Disconnect the fuel injector connector (for Port Injection).

(e) Remove the radiator support opening cover.

  • for Hatchback except GR

    Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; EXTERIOR PANELS / TRIM: FRONT BUMPER (for Hatchback except GR): REMOVAL+

  • for Sedan with Illumination

    Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; EXTERIOR PANELS / TRIM: FRONT BUMPER (for Sedan with Illumination): REMOVAL+

  • for Sedan without Illumination

    Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; EXTERIOR PANELS / TRIM: FRONT BUMPER (for Sedan without Illumination): REMOVAL+

(f) Remove the inlet No. 1 air cleaner.

  • for TMC Made:

    Click here 2023 - 2025 MY Corolla Corolla Hatchback [09/2022 -        ]; M20A-FKS (COOLING): COOLING FAN MOTOR (w/ Cooling Fan ECU): REMOVAL+

  • except TMC Made:

    Click here 2023 MY Corolla Corolla Hatchback [09/2022 - 11/2022]; M20A-FKS (COOLING): COOLING FAN MOTOR (w/o Cooling Fan ECU): REMOVAL+

(g) Remove the 2 bolts and disengage the clamp to separate the engine wire.

(h) Remove the No. 1 engine under cover assembly.

Click here 2023 MY Corolla Corolla Hatchback [09/2022 - 11/2022]; M20A-FKS (ENGINE MECHANICAL): ENGINE ASSEMBLY: REMOVAL+

(i) Disconnect the fuel injector connector (for Direct Injection).

(j) Remove the air cleaner cap with air cleaner hose.

Click here 2020 - 2025 MY Corolla Corolla Hatchback [09/2019 -        ]; M20A-FKS (ENGINE CONTROL): THROTTLE BODY: REMOVAL+

(k) Using an 8 mm socket wrench, remove the 3 bolts to separate the throttle body with motor assembly from the intake manifold.

(l) Check the cylinder compression pressure.

(1) Insert a compression gauge into the spark plug hole.

(2) While cranking the engine, measure the compression pressure.

Standard Compression Pressure:

1400 kPa (14.3 kgf/cm2, 203 psi)

Minimum Compression Pressure:

1200 kPa (12.2 kgf/cm2, 174 psi)

Pressure Difference between Each Cylinder:

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

NOTICE:

  • Always use a fully charged battery to obtain an engine speed of 250 rpm or more.
  • 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.

(m) Using an 8 mm socket wrench, install the throttle body with motor assembly to the intake manifold with the 3 bolts.

Torque:

10 N·m {102 kgf·cm, 7 ft·lbf}

(n) Install the air cleaner cap with air cleaner hose.

Click here 2020 - 2023 MY Corolla Corolla Hatchback [09/2019 - 11/2022]; M20A-FKS (ENGINE CONTROL): THROTTLE BODY: INSTALLATION+

(o) Connect the fuel injector connector (for Direct Injection).

(p) Install the No. 1 engine under cover assembly.

Click here 2023 MY Corolla Corolla Hatchback [09/2022 - 11/2022]; M20A-FKS (ENGINE MECHANICAL): ENGINE ASSEMBLY: INSTALLATION+

(q) Engage the clamp and install the engine wire with the 2 bolts.

Torque:

10 N·m {102 kgf·cm, 7 ft·lbf}

(r) Install the inlet No. 1 air cleaner.

  • for TMC Made:

    Click here 2023 - 2025 MY Corolla Corolla Hatchback [09/2022 -        ]; M20A-FKS (COOLING): COOLING FAN MOTOR (w/ Cooling Fan ECU): INSTALLATION+

  • except TMC Made:

    Click here 2020 - 2023 MY Corolla Corolla Hatchback [09/2019 - 11/2022]; M20A-FKS (COOLING): COOLING FAN MOTOR (w/o Cooling Fan ECU): INSTALLATION+

(s) Install the radiator support opening cover.

  • for Hatchback except GR

    Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; EXTERIOR PANELS / TRIM: FRONT BUMPER (for Hatchback except GR): INSTALLATION+

  • for Sedan with Illumination

    Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; EXTERIOR PANELS / TRIM: FRONT BUMPER (for Sedan with Illumination): INSTALLATION+

  • for Sedan without Illumination

    Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; EXTERIOR PANELS / TRIM: FRONT BUMPER (for Sedan without Illumination): INSTALLATION+

(t) Connect the fuel injector connector (for Port Injection).

(u) Install the 4 spark plugs.

Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; MAINTENANCE: M20A-FKS SPARK PLUG: INSTALLATION

(v) Clear the DTCs.

Click here 2023 MY Corolla Corolla Hatchback [09/2022 - 11/2022]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

NOTICE:

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

12. INSPECT CO/HC

HINT:

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

(a) Start the engine.

(b) Run the engine at 2500 rpm for approximately 180 seconds.

(c) Insert a CO/HC meter testing probe at least 40 cm (1.31 ft.) into the tailpipe during idle.

(d) 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.

Click here 2023 MY Corolla Corolla Hatchback [09/2022 - 11/2022]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

(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

  1. Faulty ignition:
    • Incorrect valve timing
    • Fouled, shorted or improperly gapped spark plugs
  2. Incorrect valve clearance (valve lash adjuster assembly)
  3. Leaks in intake or exhaust valves
  4. Leaks in cylinders
  5. Faulty EGR

Low

High

Rough idle (Fluctuating HC reading)

  1. Vacuum leaks:
    • PCV hoses
    • Intake manifold
    • Throttle body with motor assembly
  2. Lean mixture causing misfire
  3. Faulty EGR

High

High

Rough idle (Black smoke from exhaust)

  1. Restricted air cleaner filter element sub-assembly
  2. Plugged PCV valve
  3. Faulty SFI systems:
    • Fuel pressure regulator assembly
    • Engine coolant temperature sensor
    • Mass air flow meter
    • ECM
    • Fuel injector assemblies
    • Throttle position sensor (built into throttle body with motor assembly)
  4. Faulty EGR