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Peugeot 306 hdi will not start

Posted By linap89 4/26/2010 5:31:13 AM
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linap89
 Posted 4/26/2010 5:31:13 AM
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Hi,

I have a Peugeot 306 hdi 2.0l diesel estate 1999(v) DW10TD engine 66 000 miles

After running so well my car just stopped and will now only turn over when switching the ignition.

I have been to a dealer about repairing the vehicle and the quote given was to replace the wiring loom and the ECU which was more than I paid for the car so I need to sort this out myself.

 I have checked the management double relay and found that is not energising.

I have +12v on terminals 11,14,8 of the relay with the ignition switched on but can not get the relay coils to energise.

The relay coils go to terminal 87 and 86 of the ecu,(bosch EDC15C2).

Without the relay energised, I cannot get +12v to:

 Terminal 1 of the ECU , 

Fuses 33  which controls the LP fuel pump,

Fuse 35 which controls the 3rd piston deactivator, egr , and HP regulator.

The above items go back to the ECU onto terminals 80,52,50 respectively.

I have checked for continuity and earth / direct shorts on the cabling from the ECU connector to each engine component and all are o.k.

I would be very grateful if anyone can assist me on where to go next?

Regards

 Paul

Angus
 Posted 4/26/2010 10:40:05 AM
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Paul

Welcome to the forum.

There are a lot of variations in the wiring of the combo relay around that year.

The best match to your description, that I can find, shows the engine-control half [the bit you need to work] has its operating coil both fed and earthed by the ECU.

The ECU pin 29 [12v feed?] goes to relay pin 2, through the winding and returns[?] from relay pin 10 to ECU 86.

Check your inertia switch first; although that is shown as cutting the fuel-pump half only.  [But it is French; so anything is possible...]

.

4/26/2010 10:43:34 AM by Angus
linap89
 Posted 4/27/2010 5:38:38 AM
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Hi Angus,

The description you have given is the  wiring set up of my vehicle.

I have checked the inertia switch and have continuity across it.

Do you know of any components that might have to operate to get an output onto terminal 86 & 87 of the ECU,(to energise the relay), and also supply 12v to terminal 1 of the ECU

Many thanks for the reply.

Paul

Angus
 Posted 4/27/2010 10:04:39 AM
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Paul

Only one circuit to concentrate on; is there a 12v potential between relay pins 2 and 10 with the key on?

Not sure which way the current will flow [86 is the traditional start of a relay winding; but...] so just check across the two pins.  [Connected.]

.

linap89
 Posted 4/27/2010 12:40:26 PM
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Hi,

With the ignition on I have 11.56v on pins 2 & 10 of the relay.(I checked this voltage on the ecu terminals 29 & 86).

Regards

Paul

Angus
 Posted 4/27/2010 12:57:28 PM
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Paul

Was that 11.96v across the two pins - or on both of the pins, measured to ground?

If across [and confirmed at the relay] then the relay should click on and supply the ECU etc.

.

linap89
 Posted 4/27/2010 1:31:09 PM
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Hi,

The measurement was taken between pins 2 & 10.

At the same time I also tested pin 1 at the ECU to ground and measured 12.5v.

I cannot get 12v on fuses 33 and 35 which feed the fuel pump etc

These items are fed via the other side of the relay, (where I believe the relay coil ground is taken from terminal 87 of the ECU, via the inertia switch).

Many Thanks

Paul

Angus
 Posted 4/27/2010 1:50:00 PM
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Paul

So now there is a feed to pin1 - but before, there wasn't?

OK; so that's the first part of the puzzle fixed - just how I don't know?

Right. the fuel-pump side needs a 12v potential between relay pins 14 [permanent live] and pin 7 - which is definitely an earth supplied by the ECU.  It should run for 10 seconds at initial key-on.

If no earth on pin 7, try earthing wire 1202 at the inertia switch.

.

linap89
 Posted 4/27/2010 2:08:32 PM
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Hi,

I will try this tomorrow and let you know what I find.

Cheers

Paul

linap89
 Posted 4/28/2010 4:46:32 AM
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Hi,

I have grounded pin 7 on the relay, and I now have 12.56V onto fuses 33 & 35, the LP pump runs continuously.

When I try to start the car,(with the ground onto pin 7), it still will only turn over but will not start.

I have checked continuity on all the ground connections to the ECU, (pins 33,49,51 & 53) all are o.k

p.s

The engine management light, (k light), is on at the dash continuously when the ignition is switched on, with or without the link to pin 7 on the relay.

Many thanks

Paul


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