STOP AND START SYSTEM(for 3ZR-FAE) STA Signal Circuit

DTC Code DTC Name
STA Signal Circuit

DESCRIPTION

While the engine is being cranked, a starter operation request signal is sent to terminal STA of the ECM.

Tip:

If there is an open in the STA circuit of the ECM, stop and start control will be prohibited after the third time the engine is started by stop and start control.

  • Stop and start control will be prohibited until the ignition switch is turned off.

  • The MIL will not illuminate.

  • If there is an open in the STA circuit of the ECM, the engine can still be started using the ignition or starter switch assembly*1 or push start switch assembly*2 , as the ECM also receives the starter operation request signal from the engine stop and start ECU via CAN communication. (Stop and start control is prohibited as the reliability of the signal sent via CAN communication cannot be assured while the voltage drops during operation of the starter assembly.)

    *1: w/o Entry and Start System

    *2: w/ Entry and Start System

Figure 1. for CVT:
A347476E06
Figure 2. for Manual Transaxle:
A347476E04

WIRING DIAGRAM

  1. for CVT:

    A330989E04

  2. for Manual Transaxle:

A330989E06

PROCEDURE

  1. READ VALUE USING GTS (STARTER SIGNAL)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Starter Signal.

      Powertrain > Engine and ECT > Data List

      Tester Display

      Starter Signal

    5. Read the values displayed on the GTS when the ignition switch is ON and to START.

      OK

      Tester Display

      Condition

      Normal Condition

      Starter Signal

      Ignition switch ON

      OFF

      Engine start

      ON

    Result

    Result

    Proceed to

    OK

    A

    NG (for CVT)

    B

    NG (for Manual Transaxle)

    C
    A

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

    C

    CHECK HARNESS AND CONNECTOR (ECM - ST NO. 1 RELAY)Click here

    B

  2. CHECK HARNESS AND CONNECTOR (ECM - ST NO. 2 RELAY)

    1. Disconnect the A62 ECM connector.

    2. Remove the ST NO. 2 relay from the No. 2 engine room relay block and junction block assembly.

    3. Disconnect the A66 engine stop and start ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A62-29 (STA) - ST NO. 2 relay terminal 2

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. CHECK HARNESS AND CONNECTOR (ECM - ST NO. 1 RELAY)

    1. Disconnect the A62 ECM connector.

    2. Remove the ST NO. 1 relay from the No. 2 engine room relay block and junction block assembly.

    3. Disconnect the A66 engine stop and start ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A62-29 (STA) - ST NO. 1 relay terminal 2

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR