Peugeot 406 voltage needed to open injector selenoid for hdi 406

Car: Peugeot 406
Variant: hdi manual
Model Year: 1999
i am getting erratic voltage on injector wires when cranking engine and the engine wont start....
Posted: Feb 22, 2016 (8 years ago)
Is your battery strong enough when cranking ? possibly " lazy " starter drawing it down ?
Posted Feb 22, 2016 (8 years ago)
You know I don't actually know!
some of them are crazy high voltages.
normally if I'm testing them I'd use a current clamp and a 'scope.
Not voltages!
or a simple "Noid" lamp to check for switching.
But if you are getting erratic voltages the first suspect would have to be wiring.
I've seen a number of French cars with what can only be described as dust cored wire.
The internal wire cores crumble.
So very high resistance.
If you don't have access to a 'scope and amp clamp the a load test would work.
You need some jumper wires with alligator clamps and back probe needles for getting into the back of the ECU plug and a load,
I use a 21W indicator bulb.
Disconnect the injectors and the ECU,
12V from the battery through the load bulb into the back probe pin and into the ECU harness plug for ONE injector wire,
then on the other end of the injector wire a jump wire to ground,
better back probe with a pin so as to not distort the injector terminal.
Bulb should light on every wire tested with the same intensity,
If you have one a multi meter set to amps and in series should read the same amps.
Sounds fiddly but it's only 8 wires to test.
Any wires tested where the bulb glow intensity is low is suspect.
Similar tests on the ECU for power and grounds is helpful.
Forget testing anything with a multi meter.
you can get a full battery voltage flowing through ONE strand of wire.
Only by loading a circuit can you tell if it can actually carry current.
After all this if it's still doing it it's time to send off the ECU for testing.
Posted Feb 22, 2016 (8 years ago)
what a faff....just get a multimeter and check the resistance of the wire...anything above an ohm is a resistance
Posted Feb 22, 2016 (8 years ago)
I'd suggest that Paulione looks into a Set of leads called "load pro".
There's a lot on youtube.
Including the inventors fun and games suing Snapon for copyright infringement.
! ohm is a tiny resistance.
Guys name is Dan Sullivan and he makes his case.
And yes I own a set.
Posted Feb 22, 2016 (8 years ago)
What is the voltage needed to trigger open the valve/solenoid for hdi injectors during firing.....?
Posted Feb 23, 2016 (8 years ago)
about 80 volts
Posted Mar 27, 2018 (6 years ago)
^ Probably got it fixed as the post is more than 2yrs old .
Posted Mar 27, 2018 (6 years ago)
but that doesn't matter as its information for others
Posted Mar 28, 2018 (6 years ago)
Good point , but with this forum not many use the search facility and tend to post afresh .
Posted Mar 28, 2018 (6 years ago)
but if they do then they have the answer
Posted Mar 30, 2018 (6 years ago)

This problem is archived

If you're having a similar problem please click below to re-post this problem, you can then customise it to suit your situation.

Join the community
Got a question? Can you answer other questions here? If so please...
More problems with the 1999 model year Peugeot 406

We have 67 problems and solutions in our database for this model year of the car.

View all Peugeot 406 Problems