Toyota Corolla Cross: System Description
SYSTEM DESCRIPTION
IMMOBILISER SYSTEM DESCRIPTION
The immobiliser system is designed to prevent the vehicle from being stolen. This system uses the transponder key ECU assembly that stores the key ID codes of authorized ignition keys. If an attempt is made to start the engine using an unauthorized door control transmitter assembly, the transponder key ECU assembly sends a signal to the ECM to prohibit fuel delivery and ignition, effectively disabling the engine.
FUNCTION OF MAIN COMPONENTS
|
Component | Outline |
|---|---|
|
Transponder key ECU assembly |
|
| Transponder key coil |
When a door control transmitter assembly is inserted into the ignition key cylinder, the transponder key amplifier receives the key ID code from the transponder chip in the door control transmitter assembly grip and outputs it to the transponder key ECU assembly. |
|
ECM | The ECM receives key ID code verification results from the transponder key ECU assembly. The ECM also verifies the ECUs. Then judgment of whether to immobilise the engine is made. |
|
Unlock warning switch assembly | The unlock warning switch assembly detects if the door control transmitter assembly is in the ignition key cylinder and outputs the result to the transponder key ECU assembly. |
SYSTEM FUNCTION
(a) When the transponder key ECU assembly detects that the unlock warning switch assembly is on, the transponder key ECU assembly applies current to the transponder key coil and produces a magnetic field around the antenna coil. A transponder chip in the door control transmitter assembly grip outputs a key ID code signal using electromotive force generated by the magnetic field. The transponder key coil receives the signal and sends it to the transponder key ECU assembly. The transponder key ECU assembly checks if the key ID code received from the transponder key coil matches the registered key ID code.
When the engine is started, the ECM communicates with the transponder key ECU assembly and checks the door control transmitter assembly verification result. In addition, the ECM checks if the engine ID codes stored in the transponder key ECU assembly and ECM match. If they do not match, the ECM prohibits engine start.
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How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
Use the following procedure to troubleshoot the immobiliser system.
*: Use the GTS.
PROCEDURE
1. VEHICLE BROUGHT TO WORKSHOP
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Registration
REGISTRATION PROCEDURE 1. REPAIR INSTRUCTION
NOTICE: PRECAUTION WHEN REPLACING PARTS
Code registration is necessary when any of the following parts is replaced with a new one. After replacing a
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
HINT:
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order
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Right Rear Wheel Speed Sensor Circuit Intermittent (C05121F)
DESCRIPTION
Refer to DTC C051212
Click here
DTC No.
Detection Item
DTC Detection Condition
Trouble Area
C05121F
Right Rear Wheel Speed Sensor Circuit Intermittent
The speed sensor signal is excessively noisy
Precaution
PRECAUTION
PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE AUXILIARY BATTERY
TERMINAL
NOTICE:
After the ignition switch is turned off, there may be a waiting
time before disconnecting the negative (-) auxiliary battery terminal.
Click here
HINT:
When disconnecting and reconnecting the a
