Question about 2004 Isuzu Rodeo

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2004 Rodeo s 3.5 (ECM) (ICU) security code for programming a used one I have my own Tech2

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Immobilizer Circuit Operation
Immobilizer control unit (ICU) permits engine starting, when the security code which compares the security code registered into the transponder (key) and the security code registered into ICU, and is similarly registered into ICU and engine control unit (ECM) is compared and it is judged that it is normal. When the code registered into the key is unusual, and when not recognizing a security code, ICU does not permit starting of engine.
---------------------------- Electronic Control Moudle (ECM)

  • ECM in Virgin mode
  • In this mode, the ECM knows only the model vehicle identifier code.The engine can be locked/unlocked.ECM requests to ICU the VIN number. As soon as the ECM receives two correct consecutive communication frames with the same VIN code the ECM learns it.The VIN code will be stored in non-volatile memory at the end of power latch phase. ECM enters in Learnt mode.
  • ECM in Learnt mode
  • In such a state, ECM checks on every communication, the correct encoding of the ICU.
If the code received is not correct, then the vehicle is immobilized.
    The coded 5 bytes of data emitted by ECM are a mixture of MIN code and random.The coded 5 bytes of data emitted by ICU are a mixture of VIN code and random.
  • ECM in Neutral mode
  • This mode is a special intermediate mode, used for ICU replacement or immobilizer option installation.ECM request to ICU the VIN number. As soon as the ECM receives two correct consecutive communication frames with the same VIN code the ECM learns it. The VIN code will be stored in non-volatile memory at the end of power latch phase. ECM enters in Learnt mode.
  • After turning on the ignition the ECM will control the engine in a normal way for starting and running while waiting for a valid release response message from the Immobilizer.
  1. After receiving a response message including the information "ICU in learnt mode" and the correct system VIN-code
  2. ? the ECM enters the release state, which allows to continue the running of the engine.
  3. After receiving a response message including the information "ICU in learnt mode" and a wrong system VIN-code
  4. ? the ECM does not send a new request and enters the blocked state, which causes the activation of the immobilization actions of the engine.
  5. If the ECM doesn't receive a response message within a defined time from beginning of the release time period or the ECM receives a no release answer
  6. ? the ECM enters the blocked state, which causes the activation of the immobilization actions of the engine.
    • The inactive state of the Immobilizer (valid key/invalid key) ends with turning off the ignition.
Try another key. The keys are chipped and maybe the one you are using has died.Get the key /transponder/key fob reprogrammed. A local locksmith has reprogramming unit to make the key work or the other option is dealer.

Thanks. keep updated for any more can rate this solution and show your appreciation.

Posted on Oct 03, 2010


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Disable the fuel injector circuit--- Disable the fuel pump circuit---Disable the ignition coil.

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3- The above conditions continue until the ignition is switched off.

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1.2 ID Code Additional Registration
Note: This procedure will add additional remotes to the Keyless Entry Control Units memory. A total of 4 remote transmitters may be programmed into the Keyless Entry Control Units memory. When a total of registered and newly registered remotes exceed 4, the oldest one shall be erased.
Step Action
1 Note: Make sure that all the doors are closed and unlocked. Insert the ignition key into the ignition switch.
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2 Turn the Ignition key to the “ON” position and then to the “LOCK” position three times
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3 “CLOSE” and “OPEN” the driver’s doors once (Leaving the driver’s door in the “OPEN” position)
Note: This step must be carried out within five seconds after step 2 is completed.
4 Wait for 8 seconds (This wait time is critical)
5 Turn the Ignition key “ON” and then to the “LOCK” position once and turn key to the “ON” position (The key should remain in the “ON” position)
OR on/lock once
Note: This step must be carried out eight seconds after step 3 is completed.
6 “CLOSE” the driver’s door
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7 Operate the lock or unlock button of the transmitters to be programmed; a flash of the HAZARD lights indicates the remote has been successfully programmed into the control unit
8 The HAZARD lights will flash approx 4 seconds after pressing the remote button to indicate the Keyless Entry Control Unit has exited programming mode.

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