Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000001BGV5
Model Year Start: 2019 Model: Corolla Hatchback Prod Date Range: [06/2018 -           ]
Title: M20A-FKS (ENGINE CONTROL): SFI SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING; 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]

HOW TO PROCEED WITH TROUBLESHOOTING

CAUTION / NOTICE / HINT

HINT:

*: Use the Techstream.

PROCEDURE

1.

VEHICLE BROUGHT TO WORKSHOP
NEXT

2.

CUSTOMER PROBLEM ANALYSIS
NEXT

3.

CONNECT TECHSTREAM TO DLC3*

HINT:

If the display indicates a communication malfunction, inspect the DLC3.

When any CAN communication system DTCs are output, perform troubleshooting for the CAN communication system first.

NEXT

4.

CHECK DTC AND FREEZE FRAME DATA*

(a) Check for DTCs.

Powertrain > Engine > Trouble Codes

(b) Check for Freeze Frame Data.

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HINT:

Record or print DTCs and Freeze Frame Data if necessary.

NEXT

5.

CHECK VEHICLE CONTROL HISTORY AND VEHICLE CONTROL HISTORY FREEZE FRAME DATA*

(a) Check for Vehicle Control History and Vehicle Control History Freeze Frame Data.

Powertrain > Engine > Utility

Tester Display

Vehicle Control History (RoB)

HINT:

Print Vehicle Control History and Vehicle Control History Freeze Frame Data if necessary.

NEXT

6.

CLEAR DTC AND FREEZE FRAME DATA*

(a) Clear the DTCs and Freeze Frame Data.

Powertrain > Engine > Clear DTCs

NEXT

7.

CONDUCT VISUAL INSPECTION
NEXT

8.

SELECT CHECK MODE DIAGNOSIS*

(a) Change the ECM from normal mode to check mode.

Powertrain > Engine > Utility

Tester Display

Check Mode
NEXT

9.

CONFIRM PROBLEM SYMPTOMS

(a) Confirm the problem symptoms.

HINT:

If the engine does not start, first perform the "Check DTC" procedure and "Conduct Basic Inspection" procedure below.

Result

Proceed to

Malfunction does not occur

A

Malfunction occurs

B
B

GO TO STEP 11

A

10.

SIMULATE SYMPTOMS

HINT:

Refer to Symptom Simulation.

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING

NEXT

11.

CHECK DTC*

(a) Check for DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

DTCs are output

A

DTCs are not output

B
B

GO TO STEP 13

A

12.

REFER TO DTC CHART

HINT:

Refer to Diagnostic Trouble Code Chart.

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NEXT

13.

CONDUCT BASIC INSPECTION

(a) Conduct basic inspection.

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

Result

Proceed to

Malfunctioning parts not confirmed

A

Malfunctioning parts confirmed

B
B

GO TO STEP 18

A

14.

REFER TO PROBLEM SYMPTOMS TABLE

HINT:

Refer to Problem Symptoms Table.

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Result

Proceed to

Malfunctioning circuit confirmed

A

Malfunctioning parts confirmed

B
B

GO TO STEP 18

A

15.

CHECK ECM POWER SOURCE CIRCUIT

(a) Check the ECM power source circuit.

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NEXT

16.

CONDUCT CIRCUIT INSPECTION

Result

Proceed to

Malfunction not confirmed

A

Malfunction confirmed

B
B

GO TO STEP 19

A

17.

CHECK FOR INTERMITTENT PROBLEMS

(a) Check for intermittent problems.

Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: CHECK FOR INTERMITTENT PROBLEMS

NEXT

18.

CONDUCT PARTS INSPECTION
NEXT

19.

IDENTIFY PROBLEM
NEXT

20.

ADJUST AND/OR REPAIR
NEXT

21.

CONDUCT CONFIRMATION TEST
NEXT

END