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Engine check engine light code P1491

Tiny
LET4352
  • MEMBER
  • 1997 PLYMOUTH VOYAGER
  • 3.3L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 205,123 MILES
Still check engine light appeared even I changed the radiator fan control relay circuit and when going uphill it overheated. Appeared also on the engine check blinking 025 Erg and CAT. How can I resolve the problem?
Monday, July 21st, 2014 AT 1:03 PM

7 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,740 POSTS
Are the fans coming on? Also, what code was found to indicate the problem with the cat?
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Monday, July 21st, 2014 AT 6:40 PM
Tiny
LET4352
  • MEMBER
  • 4 POSTS
The fan is not working when I let the car running for a while. There is no code on the cat or EGR only P1491. Is there any other relay or fuse to look up and where is it located? Thanks again.
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Tuesday, July 29th, 2014 AT 10:22 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,740 POSTS
The fan control relay which you replaced, is it located near the lower air box mount and the frame rail? See attached pic.

If you did and are sure the fan motors are good, I have a 3 page testing procedure to go through which requires scan tool that can actuate the control relay and at least a multi meter.
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Tuesday, July 29th, 2014 AT 7:55 PM
Tiny
LET4352
  • MEMBER
  • 4 POSTS
It will be great if you can send the 3 pages test procedure. I will appreciate it very much. Thank you very much.
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Wednesday, July 30th, 2014 AT 2:32 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,740 POSTS
I wish it was that easy. Lol I can't copy and paste it. We can try working through it together if you want.
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Wednesday, July 30th, 2014 AT 8:59 PM
Tiny
LET4352
  • MEMBER
  • 4 POSTS
I changed again the radiator fan relay because code P1491 still on. At first the fan run ok and when car run for a while it overheated again no fan running and code P1491 appeared again. Checked the fuses, all ok'd and only battery is discharging I have to charge it. Alternator is ok, radiator cap ok, water pump ok Radiator fan relay keep blowing up. Please help.
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Wednesday, August 6th, 2014 AT 12:45 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,740 POSTS
If the relay keeps blowing, chances are the cooling fan motor is drawing too many amps.
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Wednesday, August 6th, 2014 AT 8:34 PM

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