|
|
FIVE VOLT POWER—ECM/PCM OUTPUT DESCRIPTION This circuit supplies approximately 5 volts to power the Accelerator Pedal Position Sensor, and the ENGINE COOLANT GAUGE—PCM OUTPUT DESCRIPTION Refer to the Instrument Panel and Gauges group for additional information. ENGINE OIL PRESSURE GAUGE—PCM DESCRIPTION Refer to the Instrument Panel and Gauges group for additional information. GLOW PLUG LAMP—PCM OUTPUT DESCRIPTION The Glow Plug lamp (malfunction indicator lamp) illuminates on the message center each time the igni- SPEED CONTROL—PCM OUTPUTS DESCRIPTION These two circuits control the fuel quantity actua- tor to regulate vehicle speed. Refer to Group 8H for AIR CONDITIONING RELAY—ECM OUTPUT DESCRIPTION This circuit controls a ground signal for operation of the A/C clutch relay. Also refer to Air Conditioning The A/C relay is located in the Power Distribution Center (PDC). The PDC is located next to the battery TIMING SOLENOID—ECM OUTPUT DESCRIPTION The timing solenoid is located on the bottom of the fuel injection pump (Fig. 7). This 12(+) volt, pulse width modulated (duty–cycle) output controls the amount of fuel timing (advance) The duty–cycle is determined by the ECM from inputs it receives from the fuel injector sensor and TACHOMETER—PCM OUTPUT DESCRIPTION The PCM recieves engine rpm values from the ECM controller, and then supplies engine rpm values GLOW PLUG RELAY—ECM OUTPUT When the ignition (key) switch is placed in the ON position, a signal is sent to the ECM relating current After receiving this signal, the ECM will determine if, when and for how long a period the glow plug Fig. 6 Glow Plug Lamp Symbol Fig. 7 Timing Solenoid 1 – FUEL INJECTION PUMP ASSEMBLY 14 - 28 FUEL SYSTEM—3.1L DIESEL ENGINE WJ DESCRIPTION AND OPERATION (Continued) 2000 JEEP GRAND CHEROKEE |