THEFT DETERRENT / KEYLESS ENTRY ENTRY AND START SYSTEM(for Start Function) B279986 Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid
DESCRIPTION
If there is a communication malfunction between the ECM and ID code box (immobiliser code ECU), or when the communication ID codes do not match, the ECM 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 ECM and ID code box (immobiliser code ECU). ·
The communication ID codes of the ECM and ID code box (immobiliser code ECU) do not match. |
·
ID code box (immobiliser code ECU) ·
ECM ·
Harness or connector |
DTC output confirmation operation (Perform either of the following):
·
Start the engine and wait for 10 seconds. If there is a malfunction, the engine will stop (communication begins within 3 seconds of the engine start, and DTCs are stored after 6 seconds). ·
Connect the cable to the negative (-) battery terminal, start the engine and wait for 10 seconds (communication begins within 3 seconds of the engine switch being turned on (IG), and DTCs are stored after 6 seconds). |
*: Only output while a malfunction is present.
| 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:
- ·
When using the GTS with the engine switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start. While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.
·The entry and start system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the entry and start system (for Start Function) after confirming that the communication systems are functioning properly.
·Before replacing the ECM or ID code box (immobiliser code ECU), refer to the Service Bulletin.
·After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
- HINT:
-
When DTC B279986 and a certification ECU (smart key ECU assembly) DTC are output simultaneously, first perform troubleshooting for the certification ECU (smart key ECU assembly) DTC.
PROCEDURE
Register the communication ID codes.
- HINT:
-
Refer to the Service Bulletin.
- Result:
Proceed to NEXT
NEXT
Using an oscilloscope, check the waveform.
| *a | Component with harness connected
(ID Code Box (Immobiliser Code ECU)) |
*b | Waveform |
| *c | Approximately 160 ms. | *d | Approximately 270 ms. |
- Measurement Condition:
Tester Connection Condition Tool Setting Specified Condition N158-3 (EFII) - Body ground Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after cable disconnected and reconnected to battery 2 V/DIV., 500 ms./DIV. Pulse generation
(See waveform)
- Result:
Result Proceed to Normal waveform A Terminal EFII stuck low (2.4 V or less) B Waveform length or shape abnormal, or EFII terminal stuck at Hi (12 V) C
A
B
C
for 7GR-FKS:
for 1GD-FTV:
Using an oscilloscope, check the waveform.
| *a | Component with harness connected
(ID Code Box (Immobiliser Code ECU)) |
*b | Waveform |
| *c | Approximately 160 ms. | *d | Approximately 270 ms. |
- Measurement Condition:
Tester Connection Condition Tool Setting Specified Condition N158-4 (EFIO) - Body ground Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after cable disconnected and reconnected to battery 2 V/DIV., 500 ms./DIV. Pulse generation
(See waveform)
- Result:
Proceed to OK NG
OK
NG
Register the ECU communication ID codes.
- HINT:
-
Refer to the Service Bulletin.
- Result:
Proceed to NEXT
NEXT
Check that the engine starts.
- Result:
Result Proceed to Engine was started A Engine was not started B
A
B
for 7GR-FKS:
for 1GD-FTV:
| *A | for 7GR-FKS |
| *B | for 1GD-FTV |
| *a | Front view of wire harness connector
(to ECM) |
Disconnect the ECM connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
for 7GR-FKS Tester Connection Switch Condition Specified Condition A1-9 (IMO) - Body ground Engine 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
for 1GD-FTV Tester Connection Switch Condition Specified Condition A2-17 (IMO) - Body ground Engine 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:
Result Proceed to Terminal IMO stuck low (2.4 V or less) A Terminal IMO stuck high (12 V) B
A
B
for 7GR-FKS:
for 1GD-FTV:
Disconnect the N158 ID code box (immobiliser code ECU) connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
for 7GR-FKS Tester Connection Condition Specified Condition N158-3 (EFII) - A1-9 (IMO) Always Below 1 Ω N158-3 (EFII) or A1-9 (IMO) - Other terminals and body ground Always 10 kΩ or higher
for 1GD-FTV Tester Connection Condition Specified Condition N158-3 (EFII) - A2-17 (IMO) Always Below 1 Ω N158-3 (EFII) or A2-17 (IMO) - Other terminals and body ground Always 10 kΩ or higher
- Result:
Proceed to OK NG
OK
NG