RM38T0EC _51 Engine / Hybrid System _115233 STOP AND START _0510781 STOP AND START SYSTEM J

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.)



A347476E30
2.667,0.51 4.604,0.75 1.938,0.24 10 false Starter operation request signal 4.26,1.615 5.823,1.833 1.563,0.219 10 false Starter operation request 4.26,2.094 5.823,2.313 1.563,0.219 10 false Starter operation request 5.719,2.479 7.115,3.052 1.396,0.573 10 false Engine Stop and Start ECU 2.385,2.115 3,2.313 0.615,0.198 10 false Open 0.583,2.51 1.042,2.708 0.458,0.198 10 false ECM 0.781,1.875 1.24,2.073 0.458,0.198 10 false STA 6.146,1.885 6.604,2.083 0.458,0.198 10 false STA 6.156,0.833 6.615,1.031 0.458,0.198 10 false CAN 0.75,0.823 1.208,1.021 0.458,0.198 10 false CAN 1.25,3.26 2.188,3.51 0.938,0.25 10 false from ST Fuse 0.854,4.74 2.115,4.958 1.26,0.219 10 false to Starter Assembly 3.885,4 4.688,4.229 0.802,0.229 10 false ST Relay 0.396,5.333 2.156,5.552 1.76,0.219 10 false : CAN Communication Line

WIRING DIAGRAM

Production Date from 2022/01 to 2023/04
A504030E01
5.885,0.844 6.5,1.042 0.615,0.198 10 false CANH 0.969,0.865 1.583,1.063 0.615,0.198 10 false CANH 5.896,1.344 6.51,1.542 0.615,0.198 10 false CANL 0.99,1.323 1.604,1.521 0.615,0.198 10 false CANL 5.896,1.75 6.354,1.948 0.458,0.198 10 false STA 1.073,1.729 1.531,1.927 0.458,0.198 10 false STA 5.5,0.854 5.958,1.052 0.458,0.198 10 false I230 5.5,1.313 5.958,1.51 0.458,0.198 10 false I230 5.469,1.729 5.927,1.927 0.458,0.198 10 false A169 5.563,0.656 5.875,0.854 0.313,0.198 10 false 13 5.563,1.115 5.875,1.313 0.313,0.198 10 false 14 5.563,1.542 5.875,1.74 0.313,0.198 10 false 21 1.469,0.677 1.781,0.875 0.313,0.198 10 false 8 1.427,1.135 1.74,1.333 0.313,0.198 10 false 18 1.438,1.604 1.75,1.802 0.313,0.198 10 false 30 0.865,2.156 1.323,2.354 0.458,0.198 10 false A47 0.844,2.344 1.708,2.542 0.865,0.198 10 false ECM 5.313,2.188 7.104,2.542 1.792,0.354 10 false Engine Stop and Start ECU 0.802,4.292 1.979,4.521 1.177,0.229 10 false Auxiliary Battery 0.688,3.552 1.521,3.76 0.833,0.208 10 false BATT-MAIN 1.813,3.281 2.177,3.521 0.365,0.24 10 false ST 1.125,5.323 2.885,5.552 1.76,0.229 10 false : CAN Communication Line 3.323,4.01 3.625,4.271 0.302,0.26 10 false ST 2.979,3.021 3.135,3.219 0.156,0.198 10 false 5 3.771,3.021 3.927,3.219 0.156,0.198 10 false 3 2.979,3.448 3.135,3.646 0.156,0.198 10 false 1 3.771,3.448 3.927,3.646 0.156,0.198 10 false 2 5.75,3.646 6.365,3.854 0.615,0.208 10 false C132 5.677,3.042 5.833,3.24 0.156,0.198 10 false 2 5.896,3.146 6.208,3.344 0.313,0.198 10 false ST 5.75,3.844 6.979,4.063 1.229,0.219 10 false Starter Assembly

Production Date from 2023/04
A504030E03
5.885,0.844 6.5,1.042 0.615,0.198 10 false CANH 0.969,0.865 1.583,1.063 0.615,0.198 10 false CANH 5.896,1.344 6.51,1.542 0.615,0.198 10 false CANL 0.99,1.323 1.604,1.521 0.615,0.198 10 false CANL 5.896,1.75 6.354,1.948 0.458,0.198 10 false STA 1.073,1.729 1.531,1.927 0.458,0.198 10 false STA 5.5,0.854 5.958,1.052 0.458,0.198 10 false I230 5.5,1.313 5.958,1.51 0.458,0.198 10 false I230 5.469,1.729 5.927,1.927 0.458,0.198 10 false A169 5.563,0.656 5.875,0.854 0.313,0.198 10 false 13 5.563,1.115 5.875,1.313 0.313,0.198 10 false 14 5.563,1.542 5.875,1.74 0.313,0.198 10 false 21 1.469,0.677 1.781,0.875 0.313,0.198 10 false 4 1.458,1.156 1.771,1.354 0.313,0.198 10 false 3 1.438,1.604 1.75,1.802 0.313,0.198 10 false 18 0.833,2.146 1.292,2.344 0.458,0.198 10 false A182 0.844,2.313 1.5,2.563 0.656,0.25 10 false ECM 5.313,2.188 7.104,2.542 1.792,0.354 10 false Engine Stop and Start ECU 0.802,4.292 1.979,4.521 1.177,0.229 10 false Auxiliary Battery 0.688,3.552 1.521,3.76 0.833,0.208 10 false BATT-MAIN 1.813,3.281 2.177,3.521 0.365,0.24 10 false ST 1.125,5.323 2.885,5.552 1.76,0.229 10 false : CAN Communication Line 3.323,4.01 3.625,4.271 0.302,0.26 10 false ST 2.979,3.021 3.135,3.219 0.156,0.198 10 false 5 3.771,3.021 3.927,3.219 0.156,0.198 10 false 3 2.979,3.448 3.135,3.646 0.156,0.198 10 false 1 3.771,3.448 3.927,3.646 0.156,0.198 10 false 2 5.75,3.646 6.365,3.854 0.615,0.208 10 false C132 5.677,3.042 5.833,3.24 0.156,0.198 10 false 2 5.896,3.146 6.208,3.344 0.313,0.198 10 false ST 5.75,3.844 6.979,4.063 1.229,0.219 10 false Starter Assembly


PROCEDURE

1.READ VALUE USING GTS (STARTER SW)
a.

In accordance with the display on the GTS, read the Data List.

Powertrain > Engine > Data List
Tester Display
Starter SW
50003 372 11

b.

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

OK:
GTS Display Condition Normal Condition
Starter SW Ignition switch ON OFF
Ignition switch START ON



Result:
Proceed to
OK
NG



OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Click hereEngine / Hybrid System>STOP AND START>STOP AND START SYSTEM>PROBLEM SYMPTOMS TABLE


NG

2.CHECK VEHICLE SPECIFICATIONS
2.CHECK VEHICLE SPECIFICATIONS
a.

Confirm the specifications of the vehicle.

Result:
Result Proceed to
Production Date from 2022/01 to 2023/04 A
Production Date from 2023/04 B




A

3.CHECK HARNESS AND CONNECTOR (ECM - ST RELAY)

B

4.CHECK HARNESS AND CONNECTOR (ECM - ST RELAY)
3.CHECK HARNESS AND CONNECTOR (ECM - ST RELAY)
a.

Disconnect the A169 engine stop and start ECU connector.


b.

Disconnect the A47 ECM connector.


c.

Remove the ST relay from the No. 1 engine room relay block.


d.

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

Standard Resistance:
Tester Connection Condition Specified Condition
A47-30 (STA) - ST relay terminal 2 Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Click hereEngine / Hybrid System>STOP AND START>STOP AND START SYSTEM>PROBLEM SYMPTOMS TABLE


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.CHECK HARNESS AND CONNECTOR (ECM - ST RELAY)
a.

Disconnect the A169 engine stop and start ECU connector.


b.

Disconnect the A182 ECM connector.


c.

Remove the ST relay from the No. 1 engine room relay block.


d.

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

Standard Resistance:
Tester Connection Condition Specified Condition
A182-18 (STA) - ST relay terminal 2 Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Click hereEngine / Hybrid System>STOP AND START>STOP AND START SYSTEM>PROBLEM SYMPTOMS TABLE


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR