Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000002FL3S
Model Year Start: 2024 Model: RAV4 Prod Date Range: [10/2023 -           ]
Title: A25A-FKS (BATTERY / CHARGING): CHARGING SYSTEM: P161A87; Lost Communication with Alternator Missing Message; 2024 MY RAV4 [10/2023 -        ]

DTC

P161A87

Lost Communication with Alternator Missing Message

DESCRIPTION

The ECM communicates with the generator assembly via LIN communication. If a LIN communication error is detected, the ECM stores this DTC.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

Note

P161A87

Lost Communication with Alternator Missing Message

Generator assembly or ECM communication stops for approximately 17 minutes or more with the ignition switch ON

(1 trip detection logic)

  • Wire harness or connector
  • Generator assembly
  • ECM

-

Charge warning light does not come on

SAE Code: P161A

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  • Before replacing the ECM, refer to Registration.

    Click here 2024 MY RAV4 [10/2023 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): HOW TO PROCEED WITH TROUBLESHOOTING

PROCEDURE

1.

CHECK CHARGING SYSTEM

(a) Check the charging system.

Click here 2024 MY RAV4 [10/2023 -        ]; A25A-FKS (BATTERY / CHARGING): CHARGING SYSTEM: ON-VEHICLE INSPECTION

Result

Proceed to

OK (w/ Stop and Start System)

A

OK (w/o Stop and Start System)

B

NG

C

B

GO TO STEP 5

C

REPAIR OR REPLACE CHARGING SYSTEM

A

2.

CHECK HARNESS AND CONNECTOR (ECM - GENERATOR ASSEMBLY)

(a) Disconnect the C40 ECM connector.

(b) Disconnect the C46 generator assembly connector.

(c) Disconnect the A48 battery state sensor assembly connector.

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance (Check for Open):

Tester Connection

Condition

Specified Condition

A48-2 (LIN) or C46-2 (LIN) - C40-62 (LIN)

Always

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

A48-2 (LIN), C46-2 (LIN) or C40-62 (LIN) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Trouble Codes.

(e) Check for DTCs, and then write them down.

Powertrain > Engine > Trouble Codes

(f) Enter the following menus: Powertrain / Engine / Trouble Codes.

(g) Clear the DTCs.

Powertrain > Engine > Clear DTCs

(h) Turn the ignition switch off and wait 30 seconds.

NEXT

4.

CHECK DTC OUTPUT

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Allow the engine to idle for approximately 17 minutes or more.

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Engine / Trouble Codes.

(f) Check for DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

Only DTC P161A87 is output.

A

DTC P161A87 and P162B87 are output.

B

DTCs are not output.

C

A

REPLACE GENERATOR ASSEMBLY

B

REPLACE ECM

C

CHECK FOR INTERMITTENT PROBLEMS

5.

CHECK HARNESS AND CONNECTOR (ECM - GENERATOR ASSEMBLY)

(a) Disconnect the C40 ECM connector.

(b) Disconnect the C46 generator assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance (Check for Open):

Tester Connection

Condition

Specified Condition

C46-2 (LIN) - C40-62 (LIN)

Always

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

C46-2 (LIN) or C40-62 (LIN) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

INSPECT GENERATOR ASSEMBLY

(a) Inspect the generator assembly.

  • for 100 A, 130 A Type

    Click here 2019 - 2024 MY RAV4 [11/2018 -        ]; A25A-FKS (BATTERY / CHARGING): GENERATOR (for 100 A, 130 A Type): INSPECTION

  • for 150 A Type

    Click here 2019 - 2024 MY RAV4 [11/2018 -        ]; A25A-FKS (BATTERY / CHARGING): GENERATOR (for 150 A Type): INSPECTION

  • for VALEO Made

    Click here 2019 - 2024 MY RAV4 [11/2018 -        ]; A25A-FKS (BATTERY / CHARGING): GENERATOR (for VALEO Made): INSPECTION

OK

REPLACE ECM

NG

REPLACE GENERATOR ASSEMBLY

  • for 100 A, 130 A Type

    Click here 2024 MY RAV4 [10/2023 -        ]; A25A-FKS (BATTERY / CHARGING): GENERATOR (for 100 A, 130 A Type): REMOVAL

  • for 150 A Type

    Click here 2024 MY RAV4 [10/2023 -        ]; A25A-FKS (BATTERY / CHARGING): GENERATOR (for 150 A Type): REMOVAL

  • for VALEO Made

    Click here 2024 MY RAV4 [10/2023 -        ]; A25A-FKS (BATTERY / CHARGING): GENERATOR (for VALEO Made): REMOVAL