- Hybrid vehicle control ECU cannot be started (initial ignition occurs and hybrid vehicle control ECU cranks, then ignition stops)*1
- Engine cannot be started (initial ignition occurs and engine cranks, then ignition stops)*2
| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM10000000295B6 |
| Model Year Start: 2023 | Model: GR Corolla | Prod Date Range: [11/2022 - ] |
| Title: THEFT DETERRENT / KEYLESS ENTRY: IMMOBILISER SYSTEM (w/o Smart Key System): B279A12; Engine Immobiliser System Circuit Short to Battery; 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 - ] | ||
|
DTC |
B279A12 |
Engine Immobiliser System Circuit Short to Battery |
DESCRIPTION
- If the communication line (EFIO-IMI) to the transponder key ECU assembly is stuck high (e.g. shorted to +B), the hybrid vehicle control ECU stores this DTC.*1
-
If the communication line (EFIO-IMI) to the transponder key ECU assembly is stuck high (e.g. shorted to +B), the ECM stores this DTC.*2
- *1: for HV Model
- *2: for Gasoline Model
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Note |
|---|---|---|---|---|
|
B279A12 |
Engine Immobiliser System Circuit Short to Battery |
|
|
DTC Output Confirmation Operation:
|
- *1: for HV Model
- *2: for Gasoline Model
Vehicle Condition and Fail-safe Operation when Malfunction Detected
|
Vehicle Condition when Malfunction Detected |
Fail-safe Operation when Malfunction Detected |
|---|---|
|
|
|
- *1: for HV Model
- *2: for Gasoline Model
Related Data List and Active Test
|
DTC No. |
Data List and Active Test |
|---|---|
|
B279A12 |
- |
WIRING DIAGRAM
for HV Model
for Gasoline Model
CAUTION / NOTICE / HINT
NOTICE:
-
If the transponder key ECU assembly or hybrid vehicle control ECU is replaced, refer to Registration.*1
If the transponder key ECU assembly or ECM is replaced, refer to Registration.*2
Click here
![2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 - ]; THEFT DETERRENT / KEYLESS ENTRY: IMMOBILISER SYSTEM (w/o Smart Key System): REGISTRATION](/t3Portal/stylegraphics/info.gif)
-
After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
- *1: for HV Model
- *2: for Gasoline Model
PROCEDURE
|
1. |
SYSTEM CHECK |
(a) Check the vehicle specification.
|
Result |
Proceed to |
|---|---|
|
for HV Model |
A |
|
for Gasoline Model |
B |
| B |
|
|
|
2. |
CHECK CONNECTION OF CONNECTOR |
(a) Check that the connectors are properly connected to the hybrid vehicle control ECU and transponder key ECU assembly.
OK:
Connectors are properly connected.
| NG |
|
CONNECT CONNECTORS PROPERLY |
|
|
3. |
CHECK HYBRID VEHICLE CONTROL ECU |
(a) Disconnect the I67 transponder key ECU assembly connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I67-11 (EFIO) - Body ground |
Ignition switch off |
11 to 14 V |
| NG |
|
|
|
4. |
CHECK HYBRID VEHICLE CONTROL ECU (TERMINAL IMI) |
(a) Connect the I67 transponder key ECU assembly connector.
(b) Using an oscilloscope, check the waveform.
|
*a |
Component with harness connected (Hybrid Vehicle Control ECU) |
*b |
Waveform |
|
*c |
Approximately 160 ms. |
*d |
Approximately 270 ms. |
OK:
|
Tester Connection |
Condition |
Tool Setting |
Specified Condition |
|---|---|---|---|
|
I3-53 (IMI) - Body ground |
Within 3 seconds of starter operation and initial combustion, or within 3 seconds of ignition switch first being turned to ON after cable disconnected and reconnected to negative (-) auxiliary battery terminal |
2 V/DIV., 500 ms./DIV. |
Pulse generation (See waveform) |
| OK |
|
| NG |
|
REPLACE TRANSPONDER KEY ECU ASSEMBLY |
|
5. |
CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - HYBRID VEHICLE CONTROL ECU) |
(a) Disconnect the I3 hybrid vehicle control ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I67-11 (EFIO) - I3-53 (IMI) |
Always |
Below 1 Ω |
|
I67-11 (EFIO) or I3-53 (IMI) - Other terminals and body ground |
Always |
10 kΩ or higher |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
6. |
CHECK CONNECTION OF CONNECTOR |
(a) Check that the connectors are properly connected to the ECM and transponder key ECU assembly.
OK:
Connectors are properly connected.
| NG |
|
CONNECT CONNECTORS PROPERLY |
|
|
7. |
CHECK ECM |
(a) Disconnect the I67 transponder key ECU assembly connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I67-11 (EFIO) - Body ground |
Always |
11 to 14 V |
| NG |
|
|
|
8. |
CHECK TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFIO) |
(a) Connect the I67 transponder key ECU assembly connector.
(b) Using an oscilloscope, check the waveform.
|
*a |
Component with harness connected (Transponder Key ECU Assembly) |
*b |
Waveform |
|
*c |
Approximately 160 ms. |
*d |
Approximately 270 ms. |
OK:
|
Tester Connection |
Condition |
Tool Setting |
Specified Condition |
|---|---|---|---|
|
I67-11 (EFIO) - Body ground |
Within 3 seconds of starter operation and initial combustion, or within 3 seconds of ignition switch first being turned to ON after cable disconnected and reconnected to negative (-) auxiliary battery terminal |
2 V/DIV., 500 ms./DIV. |
Pulse generation (See waveform) |
| OK |
|
REPLACE ECM
|
| NG |
|
|
9. |
CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - ECM) |
(a) Disconnect the A47 ECM connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I67-11 (EFIO) - A47-26 (IMI) |
Always |
Below 1 Ω |
|
I67-11 (EFIO) or A47-26 (IMI) - Other terminals and body ground |
Always |
10 kΩ or higher |
| OK |
|
REPLACE ECM
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|