DIAGNOSIS SYSTEM
DESCRIPTION
(a) The certification ECU (smart key ECU assembly) and ECM control the vehicle immobiliser system functions. Immobiliser system data and Diagnostic Trouble Codes (DTCs) can be read through the vehicle Data Link Connector 3 (DLC3).
In some cases, a malfunction may be occurring in the immobiliser system even though the security indicator light is not illuminated.
When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform repairs.
CHECK DLC3
(a) Check the DLC3.
Click here
INSPECT BATTERY VOLTAGE
(a) Measure the battery voltage.
Standard Voltage:
11 to 14 V
If the voltage is below 11 V, recharge or replace the battery.
START FUNCTION PROBLEM SYMPTOMS
Symptom | Suspected Area | Component Malfunction | Possible Output DTCs | Related Data List Item |
---|---|---|---|---|
Engine cannot be started*1 | Certification ECU (smart key ECU assembly) | Open or short circuit inside ECU |
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Engine cannot be started*1 | ID code box (immobiliser code ECU) | Open or short circuit inside ECU |
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ECM | Open or short circuit inside ECU |
| EFI Code Receive | |
SFI system | ECM incompatible with installed immobiliser system | B279C95 |
| |
Power source mode cannot be changed*1 | Engine switch | Open or short circuit inside switch | B278A |
|
Certification ECU (smart key ECU assembly) | Open or short circuit inside ECU |
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| |
Steering lock lock/unlock not possible*2 | Steering lock ECU (steering lock actuator or upper bracket assembly) |
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