| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM10000000255SX |
| Model Year Start: 2023 | Model: GR Corolla | Prod Date Range: [09/2022 - ] |
| Title: G16E-GTS (ENGINE CONTROL): SFI SYSTEM: ECM Power Source Circuit; 2023 - 2025 MY GR Corolla [09/2022 - ] | ||
|
ECM Power Source Circuit |
DESCRIPTION
When the ignition switch is turned on (IG), the battery voltage is applied to IGSW of the ECM. When the transistor in the MREL circuit operates, current flows from the 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 |
|---|---|---|
|
A139-10(E1) - Body ground |
Always |
Below 1 Ω |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
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:
|
|
| NG |
|
|
|
3. |
INSPECT NO. 1 INTEGRATION RELAY (EFI-MAIN NO. 1 RELAY) |
Click here
![2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; POWER DISTRIBUTION: INTEGRATION RELAY: INSPECTION](/t3Portal/stylegraphics/info.gif)
| NG |
|
REPLACE NO. 1 INTEGRATION RELAY |
|
|
4. |
CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - ECM) |
(a) Disconnect the No. 1 integration relay connector.
(b) Remove the EFI-MAIN NO. 2 relay, EFI-MAIN NO. 3 relay and EDU relay from the No. 1 engine room relay block and No. 1 junction block assembly.
HINT:
Remove the EFI-MAIN NO. 2 relay, EFI-MAIN NO. 3 relay and EDU relay connected between the checked terminals as the coil inside the relay influences the measurement value.
(c) Disconnect the ECM connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
9B-6 - A139-15(MREL) |
Always |
Below 1 Ω |
|
9B-4 - A139-9(+B) |
Always |
Below 1 Ω |
|
9B-4 - A139-35(+B2) |
Always |
Below 1 Ω |
|
9B-6 or A139-15(MREL) - Body ground and other terminals |
Always |
10 kΩ or higher |
|
9B-4, A139-9(+B) or A139-35(+B2) - Body ground and other terminals |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
5. |
CHECK TERMINAL VOLTAGE (POWER SOURCE OF NO. 1 INTEGRATION RELAY) |
|
(a) Disconnect the No. 1 integration relay connector. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
9B-3 - Body ground |
Always |
11 to 14 V |
|
9B-5 - Body ground |
Always |
11 to 14 V |
| OK |
|
REPLACE ECM
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - NO. 1 INTEGRATION RELAY) |
|
6. |
INSPECT NO. 1 INTEGRATION RELAY (IG2 NO.1 RELAY) |
Click here
| NG |
|
REPLACE NO. 1 INTEGRATION RELAY |
|
|
7. |
CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - ECM) |
(a) Disconnect the No. 1 integration relay connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
9A-9 - A139-2(IGP) |
Always |
Below 1 Ω |
|
9A-9 or A139-2(IGP) - Body ground and other terminals |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
8. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE VOLTAGE OF NO. 1 INTEGRATION RELAY) |
|
*a |
Front view of wire harness connector (to No. 1 Integration Relay) |
(a) Disconnect the No. 1 integration relay connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
9A-10 - Body ground |
Always |
11 to 14 V |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - NO. 1 INTEGRATION RELAY) |
|
|
9. |
CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - BODY GROUND) |
(a) Disconnect the No. 1 integration relay connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
9A-8 - Body ground |
Always |
Below 1 Ω |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
10. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - NO. 1 INTEGRATION RELAY) |
(a) Disconnect the certification ECU (smart key ECU assembly) connector.
(b) Disconnect the No. 1 integration relay connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
O175-22(IGPD) - 9A-7 |
Always |
Below 1 Ω |
|
O175-22(IGPD) or 9A-7 - Body ground and other terminals |
Always |
10 kΩ or higher |
| OK |
|
GO TO SMART KEY SYSTEM (FOR START FUNCTION)
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|