Lumina L4-151 2.5L (1991)
Crankshaft Position Sensor: Electrical Specifications
FUEL INJECTOR AND CRANKSHAFT SENSOR RESISTANCE VALUE
Injector [1] ............................................................................................................................................................................. over 1.6 Ohms but not open.
Crankshaft sensor ...................................................................................................................................................................... between 800 and 900 Ohms
[1] Check across injector terminals.
THROTTLE POSITION SENSOR VOLTAGE
Voltage [1]....................................................................................................................................................................................................... 0.33-1.33 volts
NOTE:
[1] The maximum TPS reading, at idle, is 1.33 volts. The TPS has an auto zeroing feature. If the voltage reading is within the range of about 0.33 to 1.33
volts, the ECM will use that value as closed throttle. If the voltage reading is out of the auto zero range at closed throttle, check for a binding throttle
cable or damaged linkage.
ECM CONTROLLED RELAYS AND SOLENOIDS
Check the resistance of each ECM controlled relay or solenoid coil before replacing an ECM. Replace any relay or solenoid if the resistance
measurement is less than 20 ohms. See ECM wiring diagrams under ELECTRICAL AND ELECTRONIC DIAGRAMS for coil terminal
identification of solenoids and relays to be checked.
