Filed Under (Chevrolet) by admin on 19-03-2011
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in an effort to determine the root cause of catalytic converter damage, has determined that aftermarket alarm systems incorrectly installed in vehicles have the potential to cause misfire codes and damage to the converter. These alarm systems use a circuit interrupt which utilizes the ignition circuit on the vehicles. These alarm systems utilize mechanical relays and normal vehicle movement can trigger these relays to engage and disengage the ignition circuit while the vehicle is in motion. These disruptions of the ignition circuit, which occur in milliseconds, may cause more fuel to be commanded. Over time, this dumping of fuel on and off again can cause misfire codes and ultimately damage the converter assembly. IMPORTANT: Engineering could not identify any alarms that utilize solid state circuitry that would eliminate this concern. Because of this, it has been determined that all alarm systems must be routed through the starter circuit in order to avoid this condition.
Filed Under (Mitsubishi) by admin on 28-06-2010
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1. Get a full understanding of the trouble symptoms by check the theft-alarm system,and then carry out troubleshooting. 2. The signals input to the ETACS-ECU from the switches which are related to the following systems should be normal. – Central door locking system – Headlight system – Horn system – Starting system In addition, the signals input to the ETACS-ECU from the following switches should be normal. – Hood switch – Liftgate switch – Liftgate key cylinder switch NOTE: 1. The ETACS-ECU may not accept the alarm cancelling signal under the following conditions. – If the liftgate key cylinder switch or door lock key cylinder switch is operated roughly – If these switches have been installed incorrectly or switches themselves are defective In such case, the alarm will work when the door is opened using a key. [However, when the door key cylinder switch has been shorted with the ignition switch ON, the ETACS-ECU judges the detection switch as faulty. Since then, it will prevent setting of alarm until the shorting is corrected.] 2. If the liftgate is opened using a key and is left opened when the door key cylinder switch system has a trouble (wiring harness damage, open circuit, etc.), the ETACS-ECU judges it as the liftgate holding mode and does not produce alarm even when the door is opened.
