Non starting 306 1.9D

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xantia_v6
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Re: Non starting 306 1.9D

Post by xantia_v6 » 13 Jun 2018, 14:34

But not easy on an armoured pump...
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modmytop
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My Cars: 306 P reg, 1.9D.
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Re: Non starting 306 1.9D

Post by modmytop » 13 Jun 2018, 18:48

There is no key pad to enter code.
There are 3 wires that enter the armour box (see pics above) where I now believe the stop solenoid lives. Assuming these are all immobiliser related, I would say it is not a simple stop solenoid operated from the ignition, otherwise why armour it.
Never seen any immobilser button by the steering wheel, but will have a look.

Yes good advice from Haynes. Pity it didn't point me to the stop solenoid. Also not easy job when you have to remove pump then armour to get to it.
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modmytop
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My Cars: 306 P reg, 1.9D.
Berlingo Multispace 2.0HDi, 03 reg

Re: Non starting 306 1.9D

Post by modmytop » 13 Jun 2018, 18:52

As for the 3 wires, I have read that these could be switched 12V, ground and signal. I intend to check for 12V and ground. If these are OK, does anyone know what to look for on the signal wire? Assume it is a coded waveform from the transponder pick up by the ignition barrel. Is there any circuitry between the pick up coil and the pump? I'll have a look in the Haynes...
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Re: Non starting 306 1.9D

Post by xantia_v6 » 13 Jun 2018, 18:57

The red arrow apparently points to the immobiliser button (if fitted)
Image

I have also seen a couple of reports on the web that a locked 306 immobiliser can be reset by disconnecting the battery, then turning the key to the run position before reconnecting the battery.
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modmytop
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Location: Portsmouth
My Cars: 306 P reg, 1.9D.
Berlingo Multispace 2.0HDi, 03 reg

Re: Non starting 306 1.9D

Post by modmytop » 13 Jun 2018, 19:17

No, it is 4 wires to back of pump. My eyes are failing me!

No immob button there I'm afraid.
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modmytop
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My Cars: 306 P reg, 1.9D.
Berlingo Multispace 2.0HDi, 03 reg

Re: Non starting 306 1.9D

Post by modmytop » 15 Jun 2018, 17:23

Tried the disconnect battery, ignition set to run, reconnect method to reset immob. No change.
Removed the connector that feeds the 4 wires into the back of the pump. From the harness to the connector the wires are coloured white, red green and green/yellow. They change colour from the connector to the pump. The inside of the connector was spotless, no dirt, corrosion.
The circuit diagram in the Haynes for the NAD late 97 shows 4 wires with the above colours going to the 'pump unit - anit theft'.
It describes the wires as follows:
White - Anti start
Red - Anti start
Green - Oil pressure switch
Green/yellow - ground.
Now another diagram shows the oil pressure switch as an open switch to ground. I assume switch is normally open, and when pressure is high enough switch closes and signal is grounded (but I could be wrong!).
Why would oil pressure be used in anti theft?
While cranking, the oil pressure light is on for a few seconds, then goes out. So I assume the switch is operating OK.
I measured the voltage on the 4 wires in the harness side of the connector, with ignition on and off (but not cranking).
Wire Ignition on Ignition off
White 11.4 11.7 (battery volts = 12.5)
Red 12.3 0.06
Green 0.03 0.0
Green/yellow 0.01 0.0
If the Green wire is from the oil pressure switch, it is showing close to 0V when no pressure, so perhaps the switch is normally closed and opens when pressure high enough ?
Unfortunately I don't have a multimeter that measures current via magnetic field coil, as that might tell me if solenoid is being switched or not.
Took key transponder pick up coil off steering column. Lifting cover I can see a PCB with contacts to the coil. All I could do was buzz out the coil. It gave a low resistance, so not open circuit.
Tried to trace wires from pick up module, but they disappear into loom and behind facia.
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Re: Non starting 306 1.9D

Post by xantia_v6 » 15 Jun 2018, 17:52

You have done some good sleuthing. There should also be an ECU somewhere between the transponder and the pump. This needs power via fuses, so something else to check.
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