Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001B4AK
Model Year Start: 2019 Model: Avalon HV Prod Date Range: [04/2018 -           ]
Title: A25A-FXS (ENGINE CONTROL): SFI SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING; 2019 - 2022 MY Avalon HV [04/2018 -        ]

HOW TO PROCEED WITH TROUBLESHOOTING

CAUTION / NOTICE / HINT

HINT:

*: Use the Techstream.

PROCEDURE

1.

VEHICLE BROUGHT TO WORKSHOP
NEXT

2.

CUSTOMER PROBLEM ANALYSIS
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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.

Click here 2019 MY Avalon HV [04/2018 - 08/2019]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: FREEZE FRAME DATA 2020 MY Avalon HV [08/2019 - 08/2020]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: FREEZE FRAME DATA 2021 MY Avalon HV [08/2020 - 08/2021]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: FREEZE FRAME DATA 2022 MY Avalon HV [08/2021 -        ]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: FREEZE FRAME DATA

HINT:

Record or print DTCs and Freeze Frame Data if necessary.

NEXT

5.

CLEAR DTC AND FREEZE FRAME DATA*

(a) Clear the DTCs and Freeze Frame Data.

Powertrain > Engine > Clear DTCs

NEXT

6.

CONDUCT VISUAL INSPECTION
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7.

SELECT CHECK MODE DIAGNOSIS*

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

Powertrain > Engine > Utility

Tester Display

Check Mode
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8.

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 10

A

9.

SIMULATE SYMPTOMS

HINT:

Refer to Symptom Simulation.

Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING

NEXT

10.

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 12

A

11.

REFER TO DTC CHART

HINT:

Refer to Diagnostic Trouble Code Chart.

Click here 2019 MY Avalon HV [04/2018 - 08/2019]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: DIAGNOSTIC TROUBLE CODE CHART 2020 MY Avalon HV [08/2019 - 08/2020]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: DIAGNOSTIC TROUBLE CODE CHART 2021 MY Avalon HV [08/2020 - 08/2021]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: DIAGNOSTIC TROUBLE CODE CHART 2022 MY Avalon HV [08/2021 -        ]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: DIAGNOSTIC TROUBLE CODE CHART

NEXT

12.

CONDUCT BASIC INSPECTION

(a) Conduct basic inspection.

Click here 2019 - 2022 MY Avalon HV [04/2018 -        ]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: BASIC INSPECTION

Result

Proceed to

Malfunctioning parts not confirmed

A

Malfunctioning parts confirmed

B
B

GO TO STEP 17

A

13.

REFER TO PROBLEM SYMPTOMS TABLE

HINT:

Refer to Problem Symptoms Table.

Click here 2019 - 2022 MY Avalon HV [04/2018 -        ]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: PROBLEM SYMPTOMS TABLE

Result

Proceed to

Malfunctioning circuit confirmed

A

Malfunctioning parts confirmed

B
B

GO TO STEP 17

A

14.

CHECK ECM POWER SOURCE CIRCUIT

(a) Check the ECM power source circuit.

Click here 2019 - 2022 MY Avalon HV [04/2018 -        ]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: ECM Power Source Circuit

NEXT

15.

CONDUCT CIRCUIT INSPECTION

Result

Proceed to

Malfunction not confirmed

A

Malfunction confirmed

B
B

GO TO STEP 18

A

16.

CHECK FOR INTERMITTENT PROBLEMS

(a) Check for intermittent problems.

Click here 2019 - 2022 MY Avalon HV [04/2018 -        ]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: CHECK FOR INTERMITTENT PROBLEMS

NEXT

17.

CONDUCT PARTS INSPECTION
NEXT

18.

IDENTIFY PROBLEM
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19.

ADJUST AND/OR REPAIR
NEXT

20.

CONDUCT CONFIRMATION TEST
NEXT

END