Toyota Yaris: Sfi System / ECM Power Source Circuit

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Engine & Hybrid System / G16e-gts (engine Control) / Sfi System / ECM Power Source Circuit

DESCRIPTION

When the ignition switch is turned on (IG), the auxiliary battery voltage is applied to IGSW of the ECM. When the transistor in the MREL circuit operates, current flows from the auxiliary battery to ground through the drive circuit of the EFI-MAIN NO. 1 relay, thus operating the relay which supplies power to the +B and +B2 terminals of the ECM.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

(a) Disconnect the ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A106-10(E1) - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

CHECK TERMINAL VOLTAGE (IGP TERMINAL VOLTAGE)

(a) Disconnect the ECM connector.

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A106-2(IGP) - Body ground

Ignition switch ON

11 to 14 V

*a

Front view of wire harness connector

(to ECM)

NG

GO TO STEP 6

OK

3.

INSPECT EFI-MAIN NO. 1 RELAY

Click here

NG

REPLACE EFI-MAIN NO. 1 RELAY

OK

4.

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

(a) Disconnect the ECM connector.

(b) Remove the EFI-MAIN NO. 1 relay, EFI-MAIN NO. 3 relay and EDU relay from the No. 1 engine room relay block assembly.

(c) Remove the EFI-MAIN NO. 2 relay from the No. 5 luggage room relay block assembly.

HINT:

Remove the EFI-MAIN NO. 2 and EFI-MAIN NO. 3 relays connected between the checked terminals as the coil inside the relay influences the measurement value.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

2(EFI-MAIN NO.1 relay) - A106-15(MREL)

Always

Below 1 Ω

5(EFI-MAIN NO.1 relay) - A106-9(+B)

Always

Below 1 Ω

5(EFI-MAIN NO.1 relay) - A106-35(+B2)

Always

Below 1 Ω

2(EFI-MAIN NO.1 relay) or A106-15(MREL) - Body ground and other terminals

Always

10 kΩ or higher

2(EFI-MAIN NO.1 relay), A106-15(MREL), A106-9(+B) or A106-35(+B2) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK TERMINAL VOLTAGE (POWER SOURCE OF EFI-MAIN NO. 1 RELAY)

(a) Remove the EFI-MAIN NO. 1 relay from the No. 1 engine room relay block assembly.

*1

No. 1 Engine Room Relay Block Assembly

*2

EFI-MAIN NO. 1 Relay

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

1(EFI-MAIN NO. 1 relay) - Body ground

Always

11 to 14 V

3(EFI-MAIN NO. 1 relay) - Body ground

Always

11 to 14 V

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - EFI-MAIN NO. 1 RELAY)

6.

INSPECT IGP RELAY

Click here

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG2 D RELAY)

OK

7.

CHECK HARNESS AND CONNECTOR (IGP RELAY - ECM)

(a) Disconnect the ECM connector.

(b) Remove the EFI-MAIN NO. 1 relay, EFI-MAIN NO. 3 relay and EDU relay from the No. 1 engine room relay block assembly.

(c) Remove the EFI-MAIN NO. 2 relay from the No. 5 luggage room relay block assembly.

HINT:

Remove the EFI-MAIN NO. 2 and EFI-MAIN NO. 3 relays connected between the checked terminals as the coil inside the relay influences the measurement value.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

5(IGP relay) - A106-2(IGP)

Always

Below 1 Ω

5(IGP relay) or A106-2(IGP) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.

CHECK HARNESS AND CONNECTOR (POWER SOURCE VOLTAGE OF IGP RELAY)

(a) Remove the IGP relay from the No. 1 engine room relay block assembly.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

3(IGP relay) - Body ground

Always

11 to 14 V

*1

No. 1 Engine Room Relay Block Assembly

*2

IGP Relay

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

OK

9.

CHECK HARNESS AND CONNECTOR (IGP RELAY - BODY GROUND)

(a) Remove the IGP relay from the No. 1 engine room relay block assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

2(IGP relay) - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

10.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - IG2 D RELAY)

(a) Disconnect the certification ECU (smart key ECU assembly) connector.

(b) Disconnect the instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H45-24(IGPD) - 1(IGP relay)

Always

Below 1 Ω

H45-24(IGPD) or 1(IGP relay) - Body ground and other terminals

Always

10 kΩ or higher

OK

GO TO ENTRY AND START SYSTEM (FOR START FUNCTION)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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