Toyota Yaris: Stop And Start System / STA Signal Circuit

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Engine & Hybrid System / Stop And Start / Stop And Start System / STA Signal Circuit

DESCRIPTION

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

HINT:

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 switch, 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.)

WIRING DIAGRAM

PROCEDURE

1.

READ VALUE USING GTS (STARTER SW)

Powertrain > Engine > Data List

Tester Display

Starter SW

(a) Read the values displayed on the GTS when the ignition switch is ON and on (START).

OK:

GTS Display

Switch Condition

Normal Condition

Starter SW

Ignition switch ON

OFF

Ignition switch START

ON

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

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

(a) Disconnect the A67 engine stop and start ECU connector.

(b) Disconnect the A106 ECM connector.

(c) Remove the ST NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A106-30 (STA) - ST NO. 1 relay terminal 2

Always

Below 1 Ω

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

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