306 1.6 ECU(ECM) switch off fuel pump when hot - Peugeot Forums
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Old 09-05-09, 09:15 PM   #1
Join Date: May 2009
Posts: 2
Default 306 1.6 ECU(ECM) switch off fuel pump when hot

306 1.6 TU5JP/Z engine 1993
Cold engine have no problem to start.
After 5-10km (not so hot engine) on hot days engine just stop. Start is not posible like no fuel. With Full contact II ignition switch, I dont hear usual 1-2 seconds fuel pump work.
Fuel pump don't work, no power to conector.
Double Relay module is ok, pin 10 have no ground - from ECM pin 3, if I conect pin 10 to ground Relay switch and fuel pump work.

After 15-20 min engine is cooled and I can start engine again.

Please anyone know ECM (ECU) logic in witch state of sensors ECM switch off fuel pump (Double relay). How to know witch sensors fault.
My service don't find any ECM errors.
Please Help
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Old 10-05-09, 03:59 PM   #2
Join Date: May 2009
Posts: 2

I think I found problem.
Fresh Air intake duct (Air cleaner - front side of Water cooling radiator) was burn by radiator heat (10cm x 5 cm) and engine fresh air coming behind radiator. When engine is hot and I stop on hot days, turn off and after 5 min try to start engine will start and after 5 sec will stop and no more start is possible. ECM turns off fuel pump relay. Fresh Air sensor detects too hot air (maybe fire in engine) and disconnect fuel pump. In service they don't detect problem because front motor door is open all the time and intake air is cooled.
I fix the burn duct and test 1 hour driving stopping driving...
No problem now.

Can someone confirm this behaviour of ECM.
When ECM disconnect fuel pump?
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Old 27-05-09, 02:51 PM   #3
Join Date: May 2009
Posts: 4

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