To perform a relearn on a Passkey II system, make sure there is a fully charged battery in the vehicle. If resistance value read by the BCM is what the BCM is expecting, the BCM will send a message over serial data to the PCM informing the PCM that a valid key is present and the PCM may start the vehicle. The TDM portion of the BCM will validate the resistive chip in the ignition key.
Passkey II – The Passkey II system has the Theft Deterrent Module (TDM) function stored in the Body Control Module (BCM). No relearn is required on a Passkey equipped vehicle when replacing the PCM. If the resistance value read by the TDM is what the TDM is expecting, the TDM will send a signal to the PCM informing the PCM that a valid key is present and the PCM may start the vehicle. Passkey – The Passkey system has a separate module called the Theft Deterrent Module (TDM) that validates the resistive chip in the ignition key. No relearn is required on a VATS equipped vehicle when replacing the PCM. Vehicle Anti-Theft System (VATS) – VATS has a separate module called the Theft Deterrent Module (TDM) that validates the resistive chip in the ignition key. VATS, Passkey, & Passkey II – resistive chip ignition key The sections that follow will help you identify the system and describe how to do the relearn. How do you know what system your vehicle has? Just look at the keys (see page 4). Vehicle Anti-Theft System (VATS), Passkey, & Passkey II – resistive chip ignition key Unless these procedures are correctly performed the vehicle will not start after the PCM has been replaced. Remember when you are working on your engine, it's best to determine WHY something has failed before purchasing parts to avoid costly repeat failures.GM vehicles have three types of Vehicle Thief Deterrent (VTD) systems, each requiring their own set of relearn procedures. By using the above mathematical formula we can determine that the bad spark plug ignition cable caused between 15,000,000 to 20,000,000 volts to be generated by the ignition coil! That's 5,000,000 ohms! We know that a typical small engine ignition coil uses between 3 to 5 amps. In our example below the bad spark plug ignition cable has a resistance reading of 5 mega ohms. Remember that Voltage = Amps x Resistance This excessive voltage creates a high amount of heat which consequently melts the coil's wire insulation. This high resistance causes a very high amount of voltage to be generated from your ignition coil's secondary winding. The leading cause of premature failure of an ignition coil is due to a worn or bad spark plug ignition cable.Ī bad spark plug ignition cable will have a much higher than normal resistance. Did you just replace your burned out ignition coil to have your new one burn out too? Here is why!
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