DESCRIPTION
The engine immobiliser system compares the ID code that is registered in the certification ECU (smart key ECU assembly) with the ID code of the transponder chip that is embedded in the electrical key transmitter sub-assembly.
WIRING DIAGRAM
(See page ).
CAUTION / NOTICE / HINT
CAUTION:
HINT:
If an engine immobiliser system or SFI system DTC is output, first perform troubleshooting for the engine immobiliser system or SFI system DTC.
PROCEDURE
1. |
CHECK FOR DTC |
(a) Check for DTCs (See page ).
Result |
Proceed to |
---|---|
DTCs are not output |
A |
DTCs are output |
B |
B | ![]() |
GO TO DIAGNOSTIC TROUBLE CODE CHART |
|
2. |
READ VALUE USING TECHSTREAM (IMMOBILISER FUEL CUT) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Data List.
(e) Read the Data List according to the display on the Techstream.
Engine
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|
Immobiliser Fuel Cut |
Status of immobiliser fuel cut / ON or OFF |
- |
- |
OK:
OFF is displayed after the engine is started.
Result
Result |
Proceed to |
---|---|
NG |
A |
OK |
B |
B | ![]() |
GO TO SFI SYSTEM |
|
3. |
CHECK WHETHER ENGINE STARTS |
(a) Check that the engine starts 5 seconds after the engine switch turned on (IG).
OK:
Engine starts normally.
Result
Result |
Proceed to |
---|---|
NG |
A |
OK |
B |
B | ![]() |
USE SIMULATION METHOD TO CHECK |
|
4. |
INSPECT ECM (TERMINAL IMI AND IMO) |
(a) Using an oscilloscope, check the waveform.
*a |
Component with harness connected (ECM) |
*b |
Approximately 160 ms |
*c |
Approximately 270 ms |
*d |
Approximately 40 ms |
*e |
Approximately 60 ms |
*f |
Waveform (IMO) |
*g |
Waveform (IMI) |
*h |
Waveform A |
*i |
Waveform B |
*j |
Waveform C |
*i |
Waveform A (detail) |
- |
- |
NOTICE:
The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.
Measurement Condition:
Tester Connection |
Condition |
Tool Setting |
Specified Condition |
---|---|---|---|
E14-9 (IMO) - E11-1 (E1) |
Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected |
2 V/DIV., 500 ms./DIV. |
Pulse generation (See waveform (IMO)) |
E14-8 (IMI) - E11-1 (E1) |
Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected |
2 V/DIV., 500 ms./DIV. |
Pulse generation (See waveform (IMI)) |
Result |
Proceed to |
---|---|
Normal waveform |
A |
Waveform A not output, or has abnormal wavelength or shape |
B |
Waveform B not output, or has abnormal wavelength or shape |
C |
Waveform C not output, or has abnormal wavelength or shape |
D |
B | ![]() |
GO TO STEP 7 |
C | ![]() |
REPLACE ECM |
D | ![]() |
GO TO STEP 8 |
|
5. |
REGISTER ECU COMMUNICATION ID |
(a) Register the ECU communication ID (See page
).
|
6. |
CHECK WHETHER ENGINE STARTS |
(a) Check that the engine starts.
OK:
Engine starts normally.
OK | ![]() |
END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE) |
NG | ![]() |
GO TO STEP 8 |
7. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ECM) |
(a) Disconnect the C27 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the E14 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
C27-7 (EFII) - E14-9 (IMO) |
Always |
Below 1 Ω |
C27-6 (EFIO) - E14-8 (IMI) |
Always |
Below 1 Ω |
C27-7 (EFII) or E14-9 (IMO) - Body ground |
Always |
10 kΩ or higher |
C27-6 (EFIO) or E14-8 (IMI) - Body ground |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
8. |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
(a) Replace the certification ECU (smart key ECU assembly) with a new one (See
page ).
|
9. |
REGISTER RECOGNITION CODE |
(a) Register the recognition codes in the ECUs (See page
).
|
10. |
REGISTER ECU COMMUNICATION ID |
(a) Register the ECU communication ID (See page
).
|
11. |
CHECK WHETHER ENGINE STARTS |
(a) Check that the engine starts.
OK:
Engine starts normally.
OK | ![]() |
END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE) |
NG | ![]() |
GO TO SFI SYSTEM |
Removal
REMOVAL
CAUTION / NOTICE / HINT
CAUTION:
Some of these service operations affect the SRS airbag system. Read the precautionary
notices concerning the SRS airbag system before servicing (See page
).
HINT:
Use the same procedure for the LH side and RH side.
The procedure listed be ...
Diagnosis System
DIAGNOSIS SYSTEM
1. CHECK DLC3
(a) The vehicle's ECU uses the ISO 9141-2 for communication protocol. The terminal
arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.
Symbols (Terminal No.)
Terminal Description
Condition
...
Check Bus 2 Line for Short to +B
DESCRIPTION
There may be a short circuit between one of the CAN bus lines and +B when no
resistance exists between terminal 18 (CA4H) of the central gateway ECU (network
gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 17 (CA4L) of the central
gateway ECU (network gateway ECU) and ...