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found this post while doing a search and was praying somone knows of thirsty or somebody ever figured this out cuz now my car is doing the same thing now with 136k on it. my pcm relay was bsad too and i replaced it woth the horn relay cuz they are the same type and it still blew the pcm fuse. seems like its a short to ground. dont know though and car has been down for a week now. thirsty if your outh there let me know please!
Originally posted by thirsty:
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I have a 95 Contour V6 with 140,000 miles. Recently while driving the engine went dead. I was able to restart two times and drive short distances before going dead again. The third time the PCM fuse (F9 20 amp) blew. The PCM fuse controls the spark and fuel according to the diagrams. I replaced the fuse and the car did the same thing, starts twice, runs for about 30 seconds each time and then the PCM fuse blows. Any suggestions what could cause this. I do not see any shorts. Could the PCM relay cause a problem like this?? Help!
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Hard-core CEG\'er
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Where was this from? Post the link or something.
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Well you could first pull the PCM and see if the fuse still goes. I think that might say the PCM is shorted in which case will need to be replaced. I don't see a sensor off the PCM allowing that much current to pull threw the PCM and take down 20amp fuse or a 30amp relay (thats alot of amps)
Yes you do have a short to ground, question is the PCM or wiring. If you pull the PCM and the fuse or relay still seems to go. Then you know it's the wiring.
JD
JD a.k.a Fingers
"Don't Panic"
'98 Contour GL 2.0L VCT ATX 88k
'98 Contour LX 2.5L MTX 120k
Street racing can kill
just less of a chance with a 2.0
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Here's the Link that you wanted from my original post.
Last edited by 4banganda5spd; 09/26/05 12:15 AM.
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cranked motor while pcm was out and fuse did not blow. i noticed a little spark in the starter relay when i stopped cranking the motor.
gonna put the pcm back in without the superchip and see what happens.
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ok it cranked and ran this time, but i didnt drive it. afraid to. its cranked and ran before after replacing the fuse. afraid that ill be driving and its just gonna blow again. hate that feeling of not knowing definittively what the problem was and whether or not it really fixed. guess i need to just drive it and find out. good thing i have towing in my insurance. used it 3 times in 2 days last week. really want htis fixed.
thanx a lot to those who offered NON-sarcastic advice.
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Originally posted by 4banganda5spd:
ok it cranked and ran this time, but i didnt drive it. afraid to. its cranked and ran before after replacing the fuse. afraid that ill be driving and its just gonna blow again. hate that feeling of not knowing definittively what the problem was and whether or not it really fixed..
Drive to Autozone or Advance and scan for CEL codes. Then post.
"Always do the cheap and easy ones first."
1996 V6 ATX 96K miles
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i work at advance auto. cars not throwing any codes. no cel. even if it was i think the pcm doesnt store them because its the pcm fuse thats blowing.
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Originally posted by 4banganda5spd:
.. even if it was i think the pcm doesnt store them because its the pcm fuse thats blowing.
Which PCM fuse(s) is(are) getting fused/blown?
"FUSES
ENGINE COMPARTMENT FUSE BOX
Fuse # - Amp - Color - Circuit
1 - 80 - Black - Main power
2 - 60 - Yellow - Engine cooling fan
3 - 60 - Yellow - ABS braking system, Heater blower motor
4 - 20 - Yellow - Daytime running lights
5 - 15 - Light Blue - Fog lamp
6 - Not used
7 - 20 - Yellow - ABS system
8 - Not used
9 - 20 - Light Blue - ECU
10 - 20 - Light Blue - Ignition switch
11 - 3 - Violet - ECU memory
12 - 15 - Light Blue - Horn, Hazard flasher warning system
13 - 20 - Yellow - Oxygen sensor
14 - 15 - Light Blue - Fuel pump
15 - 10 - Red - Low beam, passenger side
16 - 10 - Red - Low beam, driver's side
17 - 10 - Red - High beam, passenger side
18 - 10 - Red - High beam, driver's side
PASSENGER COMPARTMENT FUSE BOX
Fuse # - Amp - Color - Circuit
19 - Not used
20 - 10 - Black - Wiper motors (circuit breaker)
21 - 40 - Orange - Power windows
22 - 7.5 - Brown - ABS module
23 - 15 - Light Blue - Backup lights
24 - 15 - Light Blue - Brake lights
25 - 20 - Yellow - Door locks
26 - 7.5 - Brown - Main light
27 - 15 - Light Blue - Cigarette lighter
28 - 30 - Light Green - Electric seats
29 - 30 - Light Green - Rear window defroster
30 - 7.5 - Brown - Engine management system
31 - 7.5 - Brown - Instrument panel illumination
32 - 7.5 - Brown - Radio
33 - 7.5 - Brown - Parking lamps - drivers side
34 - 7.5 - Brown - Interior lights, electric side mirrors, clock
35 - 7.5 - Brown - Parking lights - passenger side
36 - 10 - Red - Air bag
37 - 30 - Light Green - Heater blower motor
38 - Not used
RELAYS
ENGINE COMPARTMENT FUSE BOX
Relay - Circuit
R1 - Daytime running lights
R2 - Radiator fan, high speed
R3 - Air conditioning
R4 - Air conditioning clutch
R5 - Radiator fan, low speed
R6 - Starter solenoid
R7 - Horn
R8 - Fuel pump
R9 - Headlight, low beam
R10 - Headlight, high beam
R11 - ECU module
D1 - Reverse voltage protection
PASSENGER COMPARTMENT FUSE B0X
Relay - Circuit
R12 - Interior lighting
R13 - Rear window defroster
R14 - Heater blower motor
R15 - Wiper motor
R16 - Ignition
D2 - Reverse voltage protection
Ray"
"Always do the cheap and easy ones first."
1996 V6 ATX 96K miles
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dont have my chiltons with me now, but IIRC under fuses in the engine comp. box, #9 is identified as "pcm/powertrain control module" its a blue 20 amp fuse with see through top next to the big yellow starter relay and another blue 20 amp fuse with see through top for the ignition.
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