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• supplies a reference voltage for the Throttle Position Sensor (TPS). Secondary 5 volt supply: • supplies the required 5 volt power source to the oil pressure sensor. • supplies the required 5 volt power source for the Vehicle Speed Sensor (VSS) (if equipped). • supplies the 5 volt power source to the transmission pressure sensor (certain automatic transmissions). IGNITION CIRCUIT SENSE The ignition circuit sense input tells the PCM the ignition switch has energized the ignition circuit. Battery voltage is also supplied to the PCM through the ignition switch when the ignition is in the RUN or START 9 ignition sense 9 circuit and is used to 9 wake up 9 the PCM. Voltage on the ignition input can be as low as 6 volts and the PCM will still function. Voltage is supplied to this circuit to power the PCM’s REMOVAL Use the scan tool to reprogram the new powertrain control module (PCM) with the vehicles original identi- The PCM (1) is located in the engine compartment To avoid possible voltage spike damage to the PCM, 1. Disconnect negative battery cable at battery. 2. Remove cover over electrical connectors. Cover snaps onto PCM. 3. NGC Modules : Carefully unplug the four 38-way connectors from PCM. JTEC Modules : Carefully 4. Remove three PCM mounting bolts (2) and remove PCM from vehicle. INSTALLATION Use the scan tool to reprogram the new powertrain control module (PCM) with the vehicles original identi- 8E - 160 ELECTRONIC CONTROL MODULES KJ |