| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM100000001GH99 |
| Model Year Start: 2020 | Model: Corolla | Prod Date Range: [01/2019 - 09/2022] |
| Title: 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: PROBLEM SYMPTOMS TABLE; 2020 - 2022 MY Corolla [01/2019 - 09/2022] | ||
PROBLEM SYMPTOMS TABLE
HINT:
- Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
- Inspect the fuses and relays related to this system before inspecting the suspected areas below.
SFI System:
|
Symptom |
Suspected Area |
Link |
|---|---|---|
|
Engine does not crank (Does not start) |
Battery |
|
|
Starter signal circuit |
|
|
|
Smart key system (w/ Smart Key System) |
|
|
|
VC output circuit (ECM 5 V output) |
|
|
|
No initial combustion (Does not start) |
Immobiliser system (w/ Smart Key System) |
|
|
Immobiliser system (w/o Smart Key System) |
|
|
|
ECM power source circuit |
|
|
|
VC output circuit (ECM 5 V output) |
|
|
|
Crank position sensor |
|
|
|
Fuel pump control circuit |
|
|
|
Ignition circuit |
|
|
|
Ignition system |
|
|
|
Fuel injector circuit |
|
|
|
Valve timing |
|
|
|
No. 1 valve rocker arm sub-assembly*2 |
|
|
|
Engine cranks normally but difficult to start |
ECM power source circuit |
|
|
Flow chart [Engine difficult to start] |
|
|
|
Fuel pump control circuit |
|
|
|
Fuel pump |
|
|
|
Engine coolant temperature sensor |
|
|
|
Ignition circuit |
|
|
|
Ignition system |
|
|
|
Fuel injector assembly |
|
|
|
Compression |
|
|
|
Fuel injector circuit |
|
|
|
Intake system |
|
|
|
Throttle body assembly |
|
|
|
No. 1 valve rocker arm sub-assembly*2 |
|
|
|
Incomplete intermittent combustion occurs (Does not start) |
Fuel pump control circuit |
|
|
Fuel line |
- |
|
|
Ignition circuit |
|
|
|
Ignition system |
|
|
|
Fuel injector assembly |
|
|
|
Crank position sensor |
|
|
|
Valve timing |
|
|
|
High engine speed (Poor idle) |
Air conditioning signal circuit (for Automatic Air Conditioning System) |
|
|
Air conditioning signal circuit (for Manual Air Conditioning System) |
|
|
|
Throttle body assembly |
|
|
|
Intake system |
|
|
|
Engine coolant temperature sensor |
|
|
|
ECM power source circuit |
|
|
|
PCV hose |
|
|
|
PCV valve |
|
|
|
Low engine speed (Poor idle) |
Fuel pump control circuit |
|
|
Throttle body assembly |
|
|
|
Intake system |
|
|
|
PCV hose |
|
|
|
PCV valve |
|
|
|
Engine stalls on deceleration |
Idle speed (refer to "Low engine speed" symptom) |
- |
|
Rough idle |
Flow chart [Rough idling] |
|
|
Compression |
|
|
|
Air fuel ratio sensor |
|
|
|
Heated oxygen sensor |
|
|
|
Mass air flow meter sub-assembly |
|
|
|
Manifold absolute pressure sensor |
|
|
|
Ignition circuit |
|
|
|
Ignition system |
|
|
|
Fuel line |
- |
|
|
Fuel pump |
|
|
|
Intake system |
|
|
|
PCV hose |
|
|
|
PCV valve |
|
|
|
VALVEMATIC system |
|
|
|
No. 1 valve rocker arm sub-assembly*2 |
|
|
|
External part malfunction (Increase in load: A/C system, CVT system, etc.) |
- |
|
|
Hunting (Poor idle) |
PCV hose |
|
|
PCV valve |
|
|
|
Mass air flow meter sub-assembly |
|
|
|
Air fuel ratio sensor |
|
|
|
Drive start control*1 |
|
|
|
Engine stalls during air conditioning operation |
Air conditioning signal circuit (for Automatic Air Conditioning System) |
|
|
Air conditioning signal circuit (for Manual Air Conditioning System) |
|
|
|
ECM |
|
|
|
Hesitation/Poor acceleration (Poor driveability) |
VALVEMATIC system |
|
|
Flow chart [Lack of power or hesitation] |
|
|
|
Fuel line |
- |
|
|
Fuel pump |
|
|
|
Valve timing |
|
|
|
Mass air flow meter sub-assembly |
|
|
|
Throttle body assembly |
|
|
|
Knock control sensor |
|
|
|
Fuel injector assembly |
|
|
|
Ignition circuit |
|
|
|
Ignition system |
|
|
|
Compression |
|
|
|
Brake override system |
|
|
|
Drive start control*1 |
|
|
|
No. 1 valve rocker arm sub-assembly*2 |
|
|
|
Lack of power |
Flow chart [Lack of power] |
|
|
Surging (Poor driveability) |
Fuel line |
- |
|
Fuel pump control circuit |
|
|
|
Fuel pump |
|
|
|
Ignition circuit |
|
|
|
Ignition system |
|
|
|
Fuel injector assembly |
|
|
|
No. 1 valve rocker arm sub-assembly*2 |
|
|
|
Engine stalls soon after starting |
Mass air flow meter sub-assembly |
|
|
Intake system |
|
|
|
Manifold absolute pressure sensor |
|
|
|
Fuel line |
- |
|
|
Valve timing |
|
|
|
VALVEMATIC system |
|
|
|
Flow chart [Engine stalls] |
|
|
|
No. 1 valve rocker arm sub-assembly*2 |
|
|
|
Shift solenoid valve SL (K313 CVT)*1 |
|
|
|
MIL (Malfunction Indicator Lamp) malfunction |
MIL Circuit |
|
|
Meter/Gauge system |
|
|
|
Unable/difficult to refuel |
Fuel system (canister, refueling valve, roll over valve, fuel tank, etc.) |
- |
*1: for CVT models
HINT:
*2: Check "Fuel Cut Elps Time" in the Data List. If the elapsed time is over 0 sec, then the engine speed is high (the engine speed at which fuel cut occurs + 500 rpm or more). In this situation, there is a possibility that a No. 1 valve rocker arm sub-assembly will become loose and malfunction, check that the No. 1 valve rocker arm sub-assemblies are properly installed.
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