Code 52 should really read, "check the o2 sensor...it's most likely plugged in, but one or more of
the wires has an intermittant connection."
The 89 and 91 8v ECUs are the same I think. You can verify yourself by checking that all important
Bosch part number on the outside of the ECU housing.
You might also try unplugging and reseating the AFM connection. I had some running problems
attributed one pin that would push out of the connector when you plugged it back in. Holding it by
the wire (inside the rubber sheath) while plugging back in ensured connectivity and the problem was
gone.
I don't think it's an ECU....I think it's most likely wiring. 405 wiring gets crispy over time.
- Original Message -----------
From: "John" <peugeot505turbo@hotmail.com>
To: peugeot-L@yahoogroups.com
Sent: Wed, 18 Jan 2006 02:58:01 -0000
Subject: [Peugeot-L] RE:1991 405 S will not stay running ... the plot thickens
> Ok, so I pulled the codes today. Had 5 or six codes. So I cleared
> them and attempted to drive it. Got a block away and the light came
> on. Pulled a code - 52 - try another ECU. I had an ECU for an 89,
> and although I know I should not have done this, I pluged it in and
> the car ran fine. (I unpluged the idle control device.) So I drove
> it around for a while, maybe 40 miles or so. Check Engine light came
> on, checked the codes, 52 - try another ECU. Kept driving it to see
> what would happen, because it was running fine. The car stalled,
> would not restart, changed back the 91 ECU and it started right up!
> Drove around for a while, maybe another 40 miles, Light came on
> again, code 52 - try another ECU and 33 - Air flow meter. I cleared
> the codes, and it was fine the rest of the night. Any ideas?? Also,
> am I damaging anything by running the wrong ECU in the car? Another
> list member offered me a used one for a reasonable price, but A) I
> am not sure that is really the problem and B) if it is, I would
> really like to wait a few weeks, as I am still recovering for
> Christmas bills. Any thoughts or ideas??
> Thanks,
>
> John
> 1991 405 S 215,000 miles
>
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Received on Tue Jan 17 20:21:29 2006
