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The OBD clears the readiness monitors and codes every time you turn the ignition off.

Tiny
CED026
  • MEMBER
  • 1996 MERCURY MYSTIQUE
  • 150,000 MILES
I am trying to get through emissions and it wont pass cause the obd loses its memory.
Thursday, September 29th, 2011 AT 11:58 PM

5 Replies

Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Check the fuses. The computer requires constant power to maintain memory.
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Friday, September 30th, 2011 AT 12:10 AM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
The schematic I have shows constant power being drawn from the stop/brake light circuit.
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Friday, September 30th, 2011 AT 12:11 AM
Tiny
CED026
  • MEMBER
  • 3 POSTS
I have checked the fuses and replaced the PCM
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Friday, September 30th, 2011 AT 12:16 AM
Tiny
CED026
  • MEMBER
  • 3 POSTS
I checked the brake lights and they work off and on, seems to have a lose connection somewhere in the steering colum.
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Friday, September 30th, 2011 AT 12:32 AM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Check the switch. It's located on the brake pedal mount. Verify that it has constant power. Check for power on the white/light blue wire on the OBDII diagnostic connector.
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Friday, September 30th, 2011 AT 12:42 AM

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