DESCRIPTION If there is a
communication malfunction between the hybrid vehicle control ECUand
certification ECU (smart key ECU assembly), or when the communication ID
codes do not match, the hybrid vehicle control ECU stores this DTC.
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
Note | B279986 |
Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid |
Either of the following conditions is met (1 trip detection logic*):
- A malfunction is detected in the communication or communication lines
between the hybrid vehicle control ECU and certification ECU (smart key
ECU assembly).
- The communication ID codes of the hybrid vehicle control ECU and certification ECU (smart key ECU assembly) do not match.
|
- Certification ECU (smart key ECU assembly)
- Hybrid vehicle control ECU
- Wire harness or connector
| DTC output confirmation operation (Perform either of the following):
- Start the hybrid control system and wait for 10 seconds. If there is a
malfunction, the hybrid control system will stop (communication begins
within 3 seconds of the hybrid control system start operation being
performed, and DTCs are stored after 6 seconds).
- Connect the cable to the negative (-) auxiliary battery terminal, start
the hybrid control system and wait for 10 seconds (communication begins
within 3 seconds of the power switch being turned on (IG), and DTCs are
stored after 6 seconds).
|
- *: Only output while a malfunction is present.
Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected |
Fail-safe Operation when Malfunction Detected |
Hybrid control system cannot be started |
- | Related Data List and Active Test
DTC No. | Data List and Active Test |
B279986 | - | WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- When using the Techstream with the power switch off, connect the
Techstream to the DLC3 and turn a courtesy light switch on and off at
intervals of 1.5 seconds or less until communication between the
Techstream and the vehicle begins. Then select the vehicle type under
manual mode and enter the following menus: Body Electrical / Smart Key.
While using the Techstream, periodically turn a courtesy light switch on
and off at intervals of 1.5 seconds or less to maintain communication
between the Techstream and the vehicle.
- The smart key system (for Start Function, HV Model) uses the LIN
communication system and CAN communication system. Inspect the
communication function by following How to Proceed with Troubleshooting.
Troubleshoot the smart key system (for Start Function, HV Model) after
confirming that the communication systems are functioning properly.
Click here
- Before replacing the hybrid vehicle control ECU or certification ECU (smart key ECU assembly), refer to Registration.
Click here
- After performing repairs, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
HINT: When DTC
B279986 and the certification ECU (smart key ECU assembly) DTC are
output simultaneously, first perform troubleshooting for the
certification ECU (smart key ECU assembly) DTC. PROCEDURE
1. |
REGISTER ECU COMMUNICATION ID | (a) Register the ECU communication ID code.
Click here
NEXT |
| |
2. |
CHECK HYBRID VEHICLE CONTROL ECU (TERMINAL IMO) |
(a) 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 |
G47-23 (IMO) - Body ground |
Within
3 seconds of hybrid control system start or within 3 seconds of power
switch turned on (IG) after cable disconnected and reconnected to
auxiliary battery | 2 V/DIV., 500 ms./DIV. |
Pulse generation (See waveform) |
Result | Proceed to |
Normal waveform | A |
Terminal EFII stuck low (2.4 V or less) |
B | Waveform not output, or has abnormal wavelength or shape |
C |
B |
| GO TO STEP 6 |
C |
| REPLACE HYBRID VEHICLE CONTROL ECU |
A |
| |
3. |
CHECK HYBRID VEHICLE CONTROL ECU (TERMINAL IMI) |
(a) 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 |
G47-22 (IMI) - Body ground |
Within
3 seconds of hybrid control system start or within 3 seconds of power
switch turned on (IG) after cable disconnected and reconnected to
auxiliary battery | 2 V/DIV., 500 ms./DIV. |
Pulse generation (See waveform) |
NG |
| REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
OK |
| |
4. |
REGISTER ECU COMMUNICATION ID | (a) Register the ECU communication ID code.
Click here
NEXT |
| |
5. |
CHECK WHETHER HYBRID CONTROL SYSTEM STARTS |
(a) Using an electrical key transmitter sub-assembly which is registered to the vehicle, turn the power switch on (IG).
(b) Check that the hybrid control system starts 5 seconds after the power switch turned on (IG).
OK: Hybrid control system starts normally.
OK |
| END (ECU COMMUNICATION ID HAS NOT BEEN REGISTERED) |
NG |
| REPLACE HYBRID VEHICLE CONTROL ECU |
6. |
CHECK HYBRID VEHICLE CONTROL ECU | (a) Disconnect the G47 hybrid vehicle control ECU connector.
(b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
Tester Connection | Condition |
Specified Condition |
G47-23 (IMO) - Body ground |
Power switch turned on (IG) using registered electrical key transmitter sub-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 HYBRID VEHICLE CONTROL ECU |
A |
| |
7. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - HYBRID VEHICLE CONTROL ECU) |
(a) Disconnect the A10 certification ECU (smart key ECU assembly) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition |
Specified Condition |
A10-3 (EFII) - G47-23 (IMO) |
Always | Below 1 Ω |
A10-3 (EFII) or G47-23 (IMO) - Other terminals and body ground |
Always | 10 kΩ or higher |
OK |
| REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR | |