Cam sensor testing - Electrical Forum - Peugeot 306 GTi-6 & Rallye Owners Club

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Subject: Cam sensor testing

S8-Tom

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Location: Chichester

Registered: 02 Feb 2018

Posts: 330

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Post #1

I thought there was a guide to testing sensors somewhere in the FAQ's but can't see it Hmm

Can the Cam sensor be tested with a multimeter? What values should I be seeing?

I've got a hot start fault - struggles to fire when the engines been run, switched off and tried to restart.

Car's had (all new):
Genuine coolant temp sensor (green)
Marelli ICV
Bosch crank sensor
Correct NGK plugs

+ history of genuine replacement coils.

Can't think of anything else that might upset the starting Dunno

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Posted 19th Jul 2022 at 09:39

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rikky 🦔

Location: cheshire

Registered: 28 Feb 2004

Posts: 26,793

Status: Offline

Post #2

http://www.306gti6.com/forum/showthread.php?id=80340&page=1

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Posted 20th Jul 2022 at 14:22

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S8-Tom

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Location: Chichester

Registered: 02 Feb 2018

Posts: 330

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Post #3

Thanks to the information provided I tested the sensor over the weekend and confirmed it's duff.

Worth noting that the signal disappears after a while presumably when the ecu's got enough info to set-up the sequential firing and check cam and crank are in sequence? Of course, it could've just been my wires coming loose that caused the signal to disappear...

It's a bit of a faff firing the car up then dashing round to put multimeter probes on pins 2 & 3 so get some extra helping hands if you can.

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Posted 25th Jul 2022 at 10:53

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RallyeP6

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Location: West Byfleet

Registered: 11 Jul 2013

Posts: 451

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Post #4

From the Autodata wiring, it looks like its a Hall effect sensor, supply, ground and signal. You can also remove the sensor, put the ignition on and pass a magnet or piece of steel across the face of the sensor and if its good you should see the voltage switch from high to low. Simulating the pulses from the cam sprocket.

Posted 8th Aug 2022 at 13:39

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S8-Tom

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Location: Chichester

Registered: 02 Feb 2018

Posts: 330

Status: Offline

Post #5

RallyeP6 wrote:

Thanks for the tips and advice, something to remember for next time with tht type of sensor Thumbs up

Although testing the resistance indicated the sensor wasn't at its best, replacing it hasn't solved my hot start issue. It has however, improved the on/off throttle situation that was aleways a little jerky- nice & smooth now!

I had a look again at my coolant temp sensor (green one in thermostat housing). It's not that old and a genuine Peugeot one but the green plastic bit is rotating within the metal. I'm going to guess that's my fault.

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Posted 9th Aug 2022 at 13:43

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Jimbamboon2

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Location: Guildford

Registered: 21 Sep 2023

Posts: 10

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Post #6

bit of a revival but did you ever resolve this. I was hoping that the cam sensor would do it as other stuff has been replaced....

Posted 8th Oct 2023 at 19:33

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S8-Tom

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Location: Chichester

Registered: 02 Feb 2018

Posts: 330

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Post #7

Jimbamboon2 wrote:

bit of a revival but did you ever resolve this. I was hoping that the cam sensor would do it as other stuff has been replaced....

My issue was the green coolant temp sensor.

If you need a cam sensor I've got a spare new one in its box due to an AutoDoc order cock up Roll eyes

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Posted 9th Oct 2023 at 08:30

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Jimbamboon2

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Location: Guildford

Registered: 21 Sep 2023

Posts: 10

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Post #8

Ah ok how come replacing the coolant temp sensor didn't solve it initially
As per your first post?

Posted 10th Oct 2023 at 10:59

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S8-Tom

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Location: Chichester

Registered: 02 Feb 2018

Posts: 330

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Post #9

Jimbamboon2 wrote:

Ah ok how come replacing the coolant temp sensor didn't solve it initially
As per your first post?

When I looked at the coolant temp closer I found the brass bit was loose from the green plastic bit. Not great for a genuine Peugeot item

You're not far from me, if you want to come over and try sensors from my car you're welcome.

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198131 injector o-rings for sale

Posted 10th Oct 2023 at 12:32

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jimbamboon

Senior User

Location: Guildford

Registered: 15 Mar 2006

Posts: 573

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Post #10

Thanks appreciate that. I'm actually in the process of trying to pick up a 6 again and considering one that has a slight hot start issue, hence the forum trawl.

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Posted 10th Oct 2023 at 13:17

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