Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000001048A
Model Year Start: 2017 Model: Sienna Prod Date Range: [08/2016 -           ]
Title: POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING; 2017 - 2020 MY Sienna [08/2016 -        ]

HOW TO PROCEED WITH TROUBLESHOOTING

CAUTION / NOTICE / HINT

HINT:

  • Use these procedures to troubleshoot the power steering system.
  • *: Use the Techstream.

PROCEDURE

1.

VEHICLE BROUGHT TO WORKSHOP
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2.

CUSTOMER PROBLEM ANALYSIS

(a) Confirm problem symptoms

See page 2016 - 2020 MY Sienna [12/2015 -        ]; INTRODUCTION: HOW TO USE THIS MANUAL: GENERAL INFORMATION

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3.

INSPECT BATTERY VOLTAGE

Standard voltage:

11 to 14 V

If the voltage is below 11 V, recharge or replace the battery before proceeding.

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4.

CHECK DTC AND FREEZE FRAME DATA*

HINT:

Refer to DTC Check / Clear.

See page 2016 - 2020 MY Sienna [12/2015 -        ]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: DTC CHECK / CLEAR

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5.

PROBLEM SYMPTOM CONFIRMATION
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6.

CHECK CAN COMMUNICATION SYSTEM*

(a) Refer to DTC output for the CAN communication system.

See page 2017 MY Sienna [08/2016 - 11/2017]; NETWORKING: CAN COMMUNICATION SYSTEM: DIAGNOSIS SYSTEM 2018 MY Sienna [11/2017 - 08/2018]; NETWORKING: CAN COMMUNICATION SYSTEM: DIAGNOSIS SYSTEM 2019 - 2020 MY Sienna [08/2018 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM: DIAGNOSIS SYSTEM

Result

Proceed to

CAN system DTC is not output

A

CAN system DTC is output

B

HINT:

  • When any CAN communication system DTCs are output, perform troubleshooting on the CAN communication system first.
  • When communication to the power steering ECU is not established through the Techstream, inspect terminals CANH and CANL of the DLC3 and the power steering ECU, and the IG circuit of the power steering ECU.
B

GO TO CAN COMMUNICATION SYSTEM

See page 2017 MY Sienna [08/2016 - 11/2017]; NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING 2018 - 2020 MY Sienna [11/2017 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

A

7.

CHECK FOR DTC*

(a) Refer to DTC Check/Clear.

See page 2016 - 2020 MY Sienna [12/2015 -        ]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: DTC CHECK / CLEAR

Chassis > EMPS > Trouble Codes

HINT:

Refer to Diagnostic Trouble Code Chart when any DTCs are output.

See page 2017 - 2020 MY Sienna [08/2016 -        ]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: DIAGNOSTIC TROUBLE CODE CHART

Result

Proceed to

DTCs are not output.

A

DTCs are output.

B
B

GO TO STEP 10

A

8.

PROBLEM SYMPTOMS TABLE

(a) Refer to Problem Symptoms Table.

See page 2017 - 2020 MY Sienna [08/2016 -        ]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: PROBLEM SYMPTOMS TABLE

Result

Proceed to

Fault is not listed in Problem Symptoms Table.

A

Fault is listed in Problem Symptoms Table.

B
B

GO TO STEP 10

A

9.

OVERALL ANALYSIS AND TROUBLESHOOTING*

(a) Refer to Terminals of ECU.

See page 2016 - 2020 MY Sienna [12/2015 -        ]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: TERMINALS OF ECU

(b) Refer to Data List / Active Test.

See page 2016 - 2020 MY Sienna [12/2015 -        ]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: DATA LIST / ACTIVE TEST

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10.

REPAIR OR REPLACE
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11.

CONFIRMATION TEST
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END