Nö nö mein bester, so einfach is dat nicht !
Zum event. Kurzschluß:
ich gehe eigentlich davon aus das Dein Meister weiß was er tut bzw. bei Operationen an der Elektrik den Akku abtrennt ?!
Ein Test ob das ECM defekt ist, wird schwierig,
am einfachsten das teil von Baugleichem Modell ausleihen.
Das Vats einfach ausbauen/ abklemmen > geht garnicht !
Der Vats-Ausgang sendet ein Wellenförmiges Sinussignal zum ECM.
Dieses lässt sich nicht Imitieren oder nachmachen !!
Wenn das Vats nicht funktioniert werden normal die Injectoren nicht freigeschaltet sowie das Starter enable Relais blockiert.
Es kann aber vorkommen das der wagen kurz anspringt wenn der Decoder nur teilweise Meckert oder der wiederstand grenzwertig ist.
System Operation
When the system is operating in normal mode, the VATS decoder reads the correct resistance during cranking. The module grounds the Start Enable Relay coil. When the start enable relay contacts close, voltage is allowed to the "S" terminal of the starter. The VATS module also sends an enable signal to the ECM. This signal allows the ECM to operate the fuel injectors during cranking. The SECURITY light will also illuminate for approximately five seconds, then turn off and remain off.
If an incorrect or no key resistance is read by the VATS decoder module, the module will shut down the start enable and ECM signal outputs for 4 minutes. The SECURITY light will flash during the cranking attempt, and will remain on during the 4-minute duration. Even if the correct resistance is read within that 4 minute duration, the VATS module will not operate the relay or signal the ECM..An error code.53 will also be set if the proper signal is not being received on CKT 229 by the ECM when the ignition is turned ON.
If an incorrect resistance is detected by the VATS module after the engine is running, the VATS module will allow the vehicle to be restarted, even with an existing failure. The SECURITY lamp will remain on to warn the driver that a VATS system fault is present. However, this also means that the car can be started w/o a correct key resistance, and is therefore vulnerable to theft. An error code.53 will also be set by the ECM in this mode.
NOTE - This error code does not store in VRAM memory, but is only present while the condition exists, and is useful as a diagnostic tool in troubleshooting VATS systems.
To signal the ECM that a correct key resistance is sensed, the VATS and PASSKey systems use a grounding square wave at a 30Hz rate. The VATS module uses an NPN output transistor to pull down (ground) the 5 VDC reference voltage presented by the ECM on terminal B6. The reference signal must be alternately grounded and allowed to be pulled up by the ECM internal resistor 30 times per second (30 Hz) and at a 50% duty cycle. This method was selected to prevent the simple powering or grounding of an ECM input to enable the fuel injectors. The signal is only needed during cranking to enable the injectors. Once the engine is running, the VATS signal can be removed and the engine will continue to operate normally, although with the SECURITY warning lamp on.
The PASSkey-II signal is a similar square-wave pulsed-ground, but at a 50Hz rate, 50% duty cycle.
Circuit Description
The system uses two leaf contacts in the outer end of the ignition lock cylinder to connect to the resistor pellet embedded into the key blank just below the bow. The wiring from these leaf contacts travels down along the steering column wire harness, where it connects to the vehicle harness at the base of the column. Usually, the VATS wiring in the column is in an orange covered cable, sometimes black, and has a lone two-wire connector (no other circuits in the cable). The circuit continues from there to the VATS decoder module via purple/white and white/black wires. The VATS decoder module is located beneath the dash in the LH foot well, near the kick panel.
The VATS decoder module has sixteen connector pins, but uses only eight wires:
• An orange wire from B+ for a constant 12VDC to pin B8
• A purple/white and a white/black wire from the key contacts
• A pink/black wire from the ECM/IGN power fuse to pin A1
• A dark blue wire connected from pin A2 to the ECM pin B6
• A gray wire to the “SECURITY” lamp in the instrument panel from pin A4
• A yellow/black wire to the start enable relay operating coil ay pin A3
• And a ground on a black/white wire at pin B1
NOTES - Circuit
