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Check for 12V on both sides of that 15A fuel pump fuse. The fuel pump relay is ahead of that fuse and it is controlled by the engine controls system. The PPL/BLK wire from the fuse is connected to the powertrain control module (PCM) When the fuel pump relay operates, 12V also passes through the 3A PCM memory fuse (check it) and is applied to the PCM. In addition, there is an inertia fuel shutoff switch (IFS) connected to the PCM and it may have cut off the fuel supply.
No driver module shown on the wiring diagram for 89-98 models. There is an EEC relay that powers the fuel pump relay. The fuel pump relay is grounded by the PCM. The voltage goes from the fuel pump relay thru the inertia switch and on to the pump.
Power for the fuel pump is supplied by fuse #16 in the Power Distribution Center (PDC), goes through the Fuel Pump Relay and then to the Fuel Pump and the ground completes the circuit. Power for the Fuel Pump Relay coil is supplied by fuse #18 in the PDC and the Powertrain Control Module (PCM) supplies ground. It is a fairly simple circuit to check.
The first thing to do is check all the fuses, especially #16 and #18. If you have they are good then you will need to pull the fuel pump relay and check for power, with the key ON at the dark green/black wire and orange wire. The DG/BK wire is the power for the fuel pump and the OR wire is the power for the relay coil. If you have power there connect a jumper between the DG/BK wire and the dark green/white wire. You should hear the fuel pump running. If not there is a problem in the DG/WT wire from the relay to the pump.
Okay, lets assume that checks out fine, the next thing to do is replace the fuel pump relay and ground the dark blue wire. You should hear the fuel pump running. Okay? Good, now go to the PCM located on the firewall in the engine room. It has three large connectors, black, white and grey. There is a DB wire in cavity 19of the grey connector. Ground this wire and you should hear the fuel pump running. If it does then the wiring for the fuel pump circuit is all good and the PCM will need to be replaced. If it doesn't run, then you have a problem in the DB wire between the relay and the PCM.
Hello kakainnspecto. Your Town Car does not have a separate ignition module. It is part of the powertrain control module(PCM). Have you lost spark? Leave a comment If you need a little more help with this. I will check back.
try restting the inertia switch in the trunk. When you turn key to "ON", the fule pump will run for only 5 seonds if the engine does not start. Listen at the fuel tank for humming of the pump.
The PCM, Powertrain Control Module controls the fuel pump relay. So, when you turn key on, the power relay powers up the PCM and the PCM powers up the fuel pump relay.
you don't have a vehicle speed sensor (VSS). You have a wheel speed sensor that tells the PCM vehcile speed in place of the VSS. What are you tring to do?
The electronic engine controls consist of the following:
powertrain control module (PCM) (12A650)
throttle position sensor
idle air control valve
camshaft position sensor
crankshaft position sensor
mass air flow sensor
intake air temperature sensor
heated oxygen sensor—front
heated oxygen sensor—rear
cylinder head temperature (CHT) sensor
power steering pressure (PSP) switch
Wheel speed sensor
The powertrain control module needs the following inputs to calibrate the engine properly: