Century V6-181 3.0L (1983)
sizes (6-3/8" diameter) were changed to effectively reduce the A.I.R. pump drive speed resulting in quieter pump operation.
ECM TERMINAL VOLTAGE
ECM - Electronic Control Module
The new ECM is a single board unit, part #1226153. Some data stream changes were required. Usage of the ALCL scan tools has changed as follows:
Mixture control solenoid duty cycle. Dwell readings of 0~ at idle and 60~ at part throttle will be seen on some ALCL tools indicating the scan tool is
unusable. If these readings are obtained, a standard external dwell meter will be required to obtain the correct dwell readings.
Oxygen sensor voltages when using ALCL scan tool as high as 1.4 volts will be seen when a full rich exhaust condition exists. Previously 1.0 volt
maximum read out was seen.
