| Last Modified: 01-30-2024 | 6.11:8.1.0 | Doc ID: RM100000001FMRG |
| Model Year Start: 2019 | Model: RAV4 | Prod Date Range: [11/2018 - 08/2020] |
| Title: A25A-FKS (ENGINE CONTROL): SFI SYSTEM (w/o Canister Pump Module): ECM Power Source Circuit; 2019 - 2020 MY RAV4 [11/2018 - 08/2020] | ||
|
ECM Power Source Circuit |
DESCRIPTION
When the ignition switch is turned to ON, 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 |
|---|---|---|
|
A24-10 (E1) - Body ground |
Always |
Below 1 Ω |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
2. |
CHECK TERMINAL VOLTAGE (IGSW TERMINAL VOLTAGE) |
|
*a |
Front view of wire harness connector (to ECM) |
(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 |
|---|---|---|
|
A24-2 (IGSW) - Body ground |
Ignition switch ON |
11 to 14 V |
| NG |
|
|
|
3. |
INSPECT EFI-MAIN NO. 1 RELAY |
(a) Inspect the EFI-MAIN NO. 1 relay.
Click here
![2019 - 2024 MY RAV4 [11/2018 - ]; A25A-FKS (ENGINE CONTROL): RELAY: ON-VEHICLE INSPECTION](/t3Portal/stylegraphics/info.gif)
| NG |
|
REPLACE EFI-MAIN NO. 1 RELAY |
|
|
4. |
CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 1 RELAY - ECM) |
(a) Remove the EFI-MAIN NO. 1 relay from the No. 1 engine room relay block and junction block assembly.
(b) Remove the VVT relay, EFI-MAIN NO.2 relay and EFI-MAIN NO.3 relay from the No. 1 engine room relay block and junction block assembly.
HINT:
Remove the VVT relay, EFI-MAIN NO. 2 relay and EFI-MAIN NO. 3 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 |
|---|---|---|
|
2 (EFI-MAIN NO. 1 relay) - A24-15 (MREL) |
Always |
Below 1 Ω |
|
5 (EFI-MAIN NO. 1 relay) - A24-9 (+B) |
Always |
Below 1 Ω |
|
5 (EFI-MAIN NO. 1 relay) - A24-35 (+B2) |
Always |
Below 1 Ω |
|
2 (EFI-MAIN NO. 1 relay) or A24-15 (MREL) - Body ground and other terminals |
Always |
10 kΩ or higher |
|
5 (EFI-MAIN NO. 1 relay), A24-9 (+B) or A24-35 (+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 EFI-MAIN NO. 1 RELAY) |
|
*1 |
No. 1 Engine Room Relay Block and Junction Block Assembly |
|
*2 |
EFI-MAIN NO. 1 Relay |
(a) Remove the EFI-MAIN NO. 1 relay from the No. 1 engine room relay block and junction block assembly.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
3 (EFI-MAIN NO. 1 relay) - Body ground |
Always |
11 to 14 V |
|
1 (EFI-MAIN NO. 1 relay) - Body ground |
Always |
11 to 14 V |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - EFI-MAIN NO. 1 RELAY) |
|
6. |
INSPECT IG2 NO. 1 RELAY |
(a) Inspect the IG2 NO. 1 relay.
Click here
| NG |
|
REPLACE IG2 NO. 1 RELAY |
|
|
7. |
CHECK HARNESS AND CONNECTOR (IG2 NO. 1 RELAY - ECM) |
(a) Remove the IG2 NO. 1 relay from the No. 1 engine room relay block and junction block assembly.
(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 |
|---|---|---|
|
3 (IG2 NO. 1 relay) - A24-2 (IGSW) |
Always |
Below 1 Ω |
|
3 (IG2 NO. 1 relay) or A24-2 (IGSW) - Body ground and other terminals |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
8. |
CHECK TERMINAL VOLTAGE (POWER SOURCE OF IG2 NO. 1 RELAY) |
|
*1 |
No. 1 Engine Room Relay Block and Junction Block Assembly |
|
*2 |
IG2 NO. 1 Relay |
(a) Remove the IG2 NO. 1 relay from the No. 1 engine room relay block and junction block assembly.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
5 (IG2 NO. 1 relay) - Body ground |
Always |
11 to 14 V |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - IG2 NO. 1 RELAY) |
|
|
9. |
CHECK HARNESS AND CONNECTOR (IG2 NO. 1 RELAY - BODY GROUND) |
(a) Remove the IG2 NO. 1 relay from the No. 1 engine room relay block and junction block assembly.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
2 (IG2 NO. 1 relay) - Body ground |
Always |
Below 1 Ω |
|
Result |
Proceed to |
|---|---|
|
OK (w/ Smart Key System) |
A |
|
OK (w/o Smart Key System) |
B |
|
NG |
C |
| B |
|
| C |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
10. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - IG2 NO. 1 RELAY) |
(a) Disconnect the certification ECU (smart key ECU assembly) connector.
(b) Remove the IG2 NO. 1 relay from the No. 1 engine room relay block and junction block assembly.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
G54-17 (IG1D) - 1 (IG2 NO. 1 relay) |
Always |
Below 1 Ω |
|
G54-17 (IG1D) or 1 (IG2 NO. 1 relay) - Body ground and other terminals |
Always |
10 kΩ or higher |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
11. |
INSPECT IGNITION SWITCH ASSEMBLY |
(a) Inspect the ignition switch assembly.
Click here
| NG |
|
|
|
12. |
CHECK HARNESS AND CONNECTOR (IGNITION SWITCH ASSEMBLY - IG2 NO. 1 RELAY) |
(a) Disconnect the ignition switch assembly connector.
(b) Remove the IG2 NO. 1 relay from the No. 1 engine room relay block and junction block assembly.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
G28-8 (IG1) - 1 (IG2 NO. 1 relay) |
Always |
Below 1 Ω |
|
G28-8 (IG1) or 1 (IG2 NO. 1 relay) - Body ground and other terminals |
Always |
10 kΩ or higher |
| OK |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - IGNITION SWITCH ASSEMBLY) |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|