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Fan relay replaced sensor and relay lights still on

Tiny
LA MESABOZO
  • MEMBER
  • 2000 DODGE DAKOTA
  • 3.9L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
I replaced my coolant sensor the relay for my electric fan, still my engine lights on and codes still there. Code 1491 telling me my relays bad. It is good my guess is that my PCM is bad. Checked it with code reader it tells me my PCM is good. I still think it is bad my PCM. Is there any other ways to make sure my PCM is good or bad? Also, is there a in line fuse for fan or PCM? Please help.
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Thursday, June 8th, 2017 AT 4:59 PM

5 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 33,727 POSTS
Diagnostic fault codes never say to replace a part or that one is bad. They only indicate the circuit or system that needs further diagnosis, or the unacceptable operating condition. When a part is referenced in a fault code, it is actually the cause of that code about half of the time.

Other than the "check engine light", what symptom or problem are you trying to solve? Does the radiator fan turn on if you unplug the two-wire coolant temperature sensor when the ignition switch is on?
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Thursday, June 8th, 2017 AT 5:19 PM
Tiny
LA MESABOZO
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  • 3 POSTS
Ok now codes 1491 & 0118? Also air-conditioning don't work? Help
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Thursday, June 15th, 2017 AT 3:10 AM
Tiny
CARADIODOC
  • MECHANIC
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"Doesn't work" can mean a dozen different things. What is the exact symptom for the AC system?

Code 118 will have set if you unplugged the two-wire coolant temperature sensor like I mentioned previously. That can be ignored, and it will self-erase after about 50 engine starts.
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Thursday, June 15th, 2017 AT 11:27 PM
Tiny
LA MESABOZO
  • MEMBER
  • 3 POSTS
My air-conditioning. Pump I no is not kicking in my blower works when I turn the nob to hot it changes the duck change it to cold I here duck changing back there is no outher codes only the 2 codes I said 0118 & 1491
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Tuesday, June 20th, 2017 AT 7:45 AM
Tiny
CARADIODOC
  • MECHANIC
  • 33,727 POSTS
Are you having a radiator electric fan problem? If you are, repair that first. If the Engine Computer detects a problem in that circuit, it can inhibit the AC compressor from running to prevent adding that heat load to the cooling system.
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Tuesday, June 20th, 2017 AT 7:55 PM

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