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Hey Guys, need some help on this one. My friend came home from the navy and left his car sit for 4-5 months without starting. 2000 Mustang V6. It cranks and no start. Voltage is good past the inertia switch and dprm, but at the fuel pump connecter all he gets is 5.3V. So I suspect it is not the pump. Also you cannot here pump run with key on or when cranking. Now I did a little research and found that the CCRM craps out on these cars frequently. Another symptom which happens on this car is battery drain overnight and the engine fan kicks on immediately as soon as key is on. He also mentioned the car has been sluggish when is was running. Does anyone know how to troubleshoot the (CCRM) Constant Control Relay Module? Dealer wants $260. for the part alone.
Driveway
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As for only getting 5.3 volts to the fuel pump, are you positive you are testing the correct wire, a 5 volt reference should be sent to the sending unit so it seems very coincidental that thats what you are reading, the fuel pumps normally run off 12 volts. Those ccrm relays are destine to fail, they are like 5 relays stuck together. You can test each relay by applying 12 volts across them and checking for continuity across the points. I have heard of people rewiring it so they were all individual automotive relays to save money, doesn’t sound like it would be to hard to do. Please keep us posted on what you come up with and sorry if I didnt explain that well, I will clarify if needed.
see if this link helps Driveway
Thanks for the link, I will definitely try the procedure. The only reason why I am suspicious of the CCRM is because the fan is switching on when key is turned on.
Driveway
[quote=”DrivewayAl” post=43355]Hey Guys, need some help on this one. My friend came home from the navy and left his car sit for 4-5 months without starting. 2000 Mustang V6. It cranks and no start. Voltage is good past the inertia switch and dprm, but at the fuel pump connecter all he gets is 5.3V. So I suspect it is not the pump. Also you cannot here pump run with key on or when cranking. Now I did a little research and found that the CCRM craps out on these cars frequently. Another symptom which happens on this car is battery drain overnight and the engine fan kicks on immediately as soon as key is on. He also mentioned the car has been sluggish when is was running. Does anyone know how to troubleshoot the (CCRM) Constant Control Relay Module? Dealer wants $260. for the part alone.
Driveway[/quote]
If the inertia switch is on the load side of the fuel pump relay circuit and your voltage is good at the inertia switch, then there is nothing wrong with the CCRM. I have seen locked up fuel pump motors cause excessive current flow and a big drop in voltage on the pump feedwire. you would swear you have a wiring problem but the cause of the voltage drop is from too much current flow on that pump wire. take and amperage measurement on that pump wire. if you are seeing over 15 amps of current flow then you found your problem.
of course the CCRM goes bad a lot tooSomething else that I haven’t seen mentioned yet is, have you checked the battery voltage? With a car that sits for that length of time and has strange electrical behaviors I often start by checking the battery. I also sometimes disconnect the battery for a while and allow the computers and control modules reset themselves. I sometimes see these things go wacky when they sit for long periods of time without use. A good thing to do when storing a vehicle is to disconnect the negative battery cable to prevent this very thing.
Keep us posted on what you find.
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