Slide 73 of 123
Notes:
Earlier, we mentioned a missing tooth region on the EDIS systemÕs VRS reluctor. Our illustrations show a typical EDIS component arrangement and sample waveform from the VRS sensor. Note that there is one pulse during each crankshaft revolution that stands out from the rest. This is the synch pulse created by the missing tooth region on the VRS reluctor. The missing tooth is exactly 90 degrees BTDC on 4 cylinder engines, 60 degrees BTDC on 6 cylinder engines and 50 degrees BTDC on 8 cylinder engines. The remaining pulses generated by the 35 teeth on the reluctor are equal in size and duration, and each pulse represents 10 degrees of crankshaft rotation
Unlike sequentially injected engines that require a camshaft signal or sensor, there is no need for a camshaft signal on EDIS systems in multi-port injected engines. The VRS provides engine speed data and the signature pulse needed to properly sequence multiport injectors and the ignition coils.
Note the polarity of the signal. If the two wires are in the VRS sensor circuit
are reversed , the reversed polarity that results will make the signal unusable
to the module.
Quick Note: You can perform a quick test for an open in the VRS signal wires by placing a voltmeter across the terminals of the disconnected VRS connector plug KOEO. This signal rides on a 1.5 volt reference voltage and a no-voltage condition indicates a possible open in the sensor harness.
