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Old 24th December 2019, 22:13   #1
Bones28
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Default 75 KV6 Super strange electrical problem, P0340

Hi

Please help!

Rover 75 KV6, no start, throwing code P0340 Cam Sensor "A circuit", so we change the sensor for a new one. Car then starts and runs perfectly. Twice, then same thing, wont start, same code comes back. Freezing the sensor makes no difference.

So we order another new cam sensor. Car starts again immediately, and runs all day with perhaps seven shut offs. Then in the evening no start, same code.

Car ECU is not damp and electrical cleaner has been used. Ditto other connections.

Only other clue is that the odometer display has been coming on with the ignition off and key out. Disconnecting the battery fixes that.

There seems to be good fuel pressure. It sprays out aggressively from the fuel rail when tested.

If anyone has any suggestions please! The car is going to be scrapped if this cannot be fixed. Its just costing too much.

Many thanks in advance.
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Old 25th December 2019, 10:22   #2
Mike Noc
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Check the wiring from the cam sensor plug back to the ECM and the supply to the sensor.
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Old 25th December 2019, 12:56   #3
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Check your plenums for water retention
We have had a lot of rain recently and a slosh or two of retained water in the plenum can cause havoc with the multi connectors.
My diesel just conked out last summer due to this very situation. Once dried out and cleared no more issues.
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Old 25th December 2019, 13:50   #4
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Quote:
Originally Posted by Mike Noc View Post
Check the wiring from the cam sensor plug back to the ECM and the supply to the sensor.
Hi thanks we did check for power to the connector it was 12v.
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Old 25th December 2019, 13:54   #5
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Quote:
Originally Posted by Clickernick View Post
Check your plenums for water retention
We have had a lot of rain recently and a slosh or two of retained water in the plenum can cause havoc with the multi connectors.
My diesel just conked out last summer due to this very situation. Once dried out and cleared no more issues.
Thanks no water in the ECU, I do have a little leak at the thermostat, but not much under plenum, and dries out when car was running.

Mind you only checked the left hand side.

Last edited by Bones28; 25th December 2019 at 14:09..
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Old 26th December 2019, 01:01   #6
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i remember there was an issue with wiring loom chaffing on the body around the fuse box area under the bonnet.
Was on early cars until mgr put an insulator bit of rubber on the metal.
Maybe worth a look
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Old 26th December 2019, 11:55   #7
Mike Noc
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Quote:
Originally Posted by Bones28 View Post
Hi thanks we did check for power to the connector it was 12v.
Have you checked the cable from the sensor to the ECM? As mentioned it may be damaged causing an intermittent fault.
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Old 26th December 2019, 11:56   #8
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Quote:
Originally Posted by genpk View Post
i remember there was an issue with wiring loom chaffing on the body around the fuse box area under the bonnet.
Was on early cars until mgr put an insulator bit of rubber on the metal.
Maybe worth a look
Thanks mine does have a very thick rubber boot there, when I’m back at the car I will take air box battery tray and check every wire.

Just so strange it worked for almost a day then twice then stoped again, and it was not raining that day.
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Old 26th December 2019, 12:11   #9
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Quote:
Originally Posted by Clickernick View Post
Check your plenums for water retention
We have had a lot of rain recently and a slosh or two of retained water in the plenum can cause havoc with the multi connectors.
My diesel just conked out last summer due to this very situation. Once dried out and cleared no more issues.
Always worth remembering that the MGR Petrol ECU's are sealed and waterproofed - it is only the diesel ECU's that are prone to water damage/ingress.
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Old 27th December 2019, 00:06   #10
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Hi, I had the same code and symptoms on my V6. It turned out to be the crank shaft sensor.
Not to expensive and fairly easy to do. Hope this helps
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