Toyota Corolla Cross: Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid (B279986)
DESCRIPTION
The ECM stores this DTC when a communication line between the ECM and transponder key ECU assembly is malfunctioning or the communication ID of the ECM and transponder key ECU assembly do not match.
|
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
Note |
|---|---|---|---|---|
| B279986 |
Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid |
One of the following conditions is met:
|
| DTC Output Confirmation Operation:
|
|
Vehicle Condition when Malfunction Detected |
Fail-safe Operation when Malfunction Detected |
|---|---|
|
Engine cannot be started |
- |
|
DTC No. | Data List and Active Test |
|---|---|
|
B279986 | - |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- If the transponder key ECU assembly or ECM is replaced, refer to Registration.
Click here
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- After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
HINT:
If transponder key ECU assembly DTCs are output simultaneously, troubleshoot the transponder key ECU assembly DTCs first.
PROCEDURE
| 1. |
REGISTER ECU COMMUNICATION ID |
(a) Reregister the ECU communication ID.
|
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| 2. |
INSPECT TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFII) |
(a) 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. |
|
Tester Connection | Condition |
Tool Setting | Specified Condition |
|---|---|---|---|
|
I67-10 (EFII) - 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:
Waveform is similar to that shown in the illustration.
|
Result | Proceed to |
|---|---|
|
OK | A |
|
NG (Terminal EFII stuck low (2.4 V or less)) |
B |
| NG (Terminal EFII stuck high (12 V) or abnormal waveform) |
C |
| B |
.gif) | GO TO STEP 6 |
| C |
| REPLACE ECM
|
|
| 3. |
INSPECT TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFIO) |
(a) 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. |
|
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:
Waveform is similar to that shown in the illustration.
| NG | | REPLACE TRANSPONDER KEY ECU ASSEMBLY
|
|
| 4. |
REGISTER ECU COMMUNICATION ID |
(a) Reregister the ECU communication ID.
|
| 5. |
CHECK WHETHER ENGINE STARTS |
(a) Using a registered door control transmitter assembly, turn the ignition switch to ON.
(b) Check that the engine starts 5 seconds after the ignition switch was turned to ON.
OK:
Engine starts normally.
| OK | | END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE) |
| NG | | REPLACE ECM
|
| 6. |
INSPECT ECM (IMO TERMINAL VOLTAGE) |
(a) Disconnect the A47 ECM connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection | Condition |
Result |
|---|---|---|
|
A47-25 (IMO) - Body ground |
Ignition switch turned to ON using registered door control transmitter assembly |
Terminal IMO stuck low (2.4 V or less) |
|
Terminal IMO stuck high (12 V) or abnormal waveform |
|
Result | Proceed to |
|---|---|
|
Terminal IMO stuck low (2.4 V or less) |
A |
| Terminal IMO stuck high (12 V) or abnormal waveform |
B |
| B |
| REPLACE ECM
|
|
| 7. |
CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - ECM) |
(a) Disconnect the I67 transponder key ECU assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
| I67-10 (EFII) - A47-25 (IMO) |
Always | Below 1 Ω |
|
I67-10 (EFII) or A47-25 (IMO) - Other terminals and body ground |
Always | 10 kΩ or higher |
| OK | | REPLACE TRANSPONDER KEY ECU ASSEMBLY
|
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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DESCRIPTION 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.
DTC No. Detection Item
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Engine Immobiliser System Incorrect Assembly (B279C95)
DESCRIPTION If an ECM that is incompatible with the immobiliser system is installed, the ECM stores this DTC.
DTC No. Detection Item
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Note B
Engine does not Start but Initial Combustion Occurs
DESCRIPTION If the key ID codes of the door control transmitter assembly and transponder key ECU assembly match, the immobiliser system is unset and the engine start permission signal is sent to the E
SEE MORE:
Removal
REMOVAL
CAUTION / NOTICE / HINT
COMPONENTS (REMOVAL)
Procedure
Part Name Code
1
PRECAUTION
-
-
-
2
REAR WHEEL
-
-
Inspection
INSPECTION PROCEDURE 1. INSPECT CANISTER (CHARCOAL CANISTER ASSEMBLY)
(a) Visually check the canister (charcoal canister assembly). (1) Visually check the canister (charcoal canister assembly) for cracks or damage.
If cracks or damage is found, replace the canister (charcoal canister assembly).
