Mi16 (1.9) ECU - Fuel Pump Switching
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Thread: Mi16 (1.9) ECU - Fuel Pump Switching

  1. #1
    Contented Peugeot Driver addo's Avatar
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    Icon7 Mi16 (1.9) ECU - Fuel Pump Switching

    Waking old Paris from a three year sleep today, I had to remove the fuel pump relay cover and hold the reed in at first, to get fuel pressure. After a bit, it stayed pulled in. Now to fix the "running on two" plug well full of water...

    Is the relay coil ground (off the ECU) switched by a transistor or solid state relay?

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    I've seen plenty of faults online where people had neither fuel nor spark, but I had a big healthy spark the whole time I was fiddling about. The connector pins all look passably clean and positive feed was OK - or am I just looking at a dodgy crimp?

  2. #2
    1000+ Posts PeterT's Avatar
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    Mi16 (1.9) ECU - Fuel Pump Switching-xu9j4z_ecu.jpgM744 is switched to ground by the ECU. Goodness knows what's inside the ECU pulling it to ground.
    addo likes this.

    '92 205 Mi16
    '90 Mi16x4

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    That's what I'd concluded (by torchlight, after looking at the dubious layouts in Haynes' Book of Lies). My concern was whether I was on the edge of a recurring problem known to others, or just a teething issue with a dormant engine.

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    1000+ Posts PeterT's Avatar
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    I'd just wriggle all the crimps first and change the relay.

    '92 205 Mi16
    '90 Mi16x4

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    Ta; that was my line of thinking if it happened again soon.

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