Toyota Yaris: Charging System / Lost Communication with Alternator Missing Message (P161A87)

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Power Source & Network / G16e-gts (battery / Charging) / Charging System / Lost Communication with Alternator Missing Message (P161A87)

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

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

Comes 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 Service Bulletin.

PROCEDURE

1.

CHECK CHARGING SYSTEM

Click here

NG

REPAIR OR REPLACE CHARGING SYSTEM

OK

2.

CHECK HARNESS AND CONNECTOR (ECM - GENERATOR ASSEMBLY)

(a) Disconnect the D104 ECM connector.

(b) Disconnect the D53 generator assembly connector.

(c) Disconnect the O68 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

O68-2 (LIN) or D53-2 (LIN) - D104-62 (LIN)

Always

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

O68-2 (LIN), D53-2 (LIN) or D104-62 (LIN) - Body ground

Ignition switch off

(while LIN communication stopped)

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CLEAR DTC

(a) Check for DTCs using the GTS, and then write them down.

Powertrain > Engine > Trouble Codes

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs
NEXT

4.

CHECK DTC OUTPUT

(a) Start the engine.

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

(c) Using the GTS, check for DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

Only P161A87 is output

A

P161A87 and P162B87 are output

B

DTCs are not output

C

A

REPLACE GENERATOR WITH REGULATOR ASSEMBLY

B

REPLACE ECM

C

CHECK FOR INTERMITTENT PROBLEMS

    Deterioration of Battery Low Capacity (P160200)

    DESCRIPTION The auxiliary battery condition is calculated from the voltage when the engine is running (except when cranking) and then output to the ECM...

    Lost Communication with Battery Monitor Module Missing Message (P162B87)

    DESCRIPTION The ECM and battery state sensor assembly each detect reception malfunctions. A battery state sensor assembly reception malfunction detected by the battery state sensor assembly is sent to the ECM via LIN communication...

    Other information:

    Toyota Yaris XP210 (2020-2024) Reapir and Service Manual: Data List / Active Test


    DATA LIST / ACTIVE TEST DATA LIST NOTICE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. HINT: Using the GTS to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts...

    Toyota Yaris XP210 (2020-2024) Reapir and Service Manual: Crankshaft Position Sensor "A" Circuit Short to Ground (P033511,P033515)


    DESCRIPTION The crankshaft position sensor system consists of a crankshaft position sensor plate and Magneto-Resistive Element (MRE) type sensor. The crankshaft position sensor plate has 34 teeth at 10° intervals (2 teeth are missing for detecting top dead center), and is installed on the crankshaft...

    Categories

    Key Suspend Function

    If a key is left in the vehicle, the functions of the key left in the vehicle are temporarily suspended to prevent theft of the vehicle.

    To restore the functions, press the unlock button on the functions-suspended key in the vehicle.

    read more

     
    Copyright © 2024 www.toyaris4.com