puzzled to say the least

[phildini]

After breaking down on the way to Bromley, I had not much time to investigate the problem on my A610.
The Diagnostic machine told me that it's the " ENGINE SPEED SENSOR 23" of which I understand partially that it's my crank sensor/ tdc sensor. I bought a new one and once I had taken off the old sensor ( of which on the A610 are routed completely different form a GTA ) I tested the resistance and it seemed ok. I fitted the new one anyway but the fecking car still does not start. After clearing the fault code it still came up as above.I checked the resistance from the ECU and no problem there. Any ideas??? I can only think it may be the ECU.....

... what did I say about breaking down in old French cars... it's a dead cert, just as Mr. Allen would say...

Have you had it before intermittently?

[phildini]

... Have you had it before intermittently?

Well..... yes I think so, initially I thought it was just that common A610 problem where it cuts out etc...... but it would restart. Now it just turns over but no life.

Not sure if it's the same on the 610 as GTA but there was a red-white, white-red wire reversal that you needed to do as Renault had wired them up backwards

See this thread post by Alan Moore. Again they may have altered it by now but worth a check:

http://www.renaultalpineownersclub.com/ ... hlight=tdc

Good call ,worth a try .
Some sensors from 25 etc are not wrong-right for the Alps .IE red red sometimes does work

Well I wrote a long post for you and lost the whole thing, on my phone...

So quick version:
Disconnect ecu, take loom end connector, take each pin in turn and buzz out with a dvm on resistance / continuity all the other pins. Make sure you get correct resistance readings for the pin pairs - sensors etc. Make sure the air temp and water temp read in the right ball park. Check for shorts to ground where there shouldn't be, open circuits, and finally continuity between lines that shouldn't (usually as a result of ageing and cracking insulation - injector lines are bad for this). Re check your tdc as well.

Assuming all good, then connect ecu back up, switch to ignition on, and then go round all the sensor (air and water temp, 02), tb pot, map, tdc lines (signals and both power) with a dvm I'm Vdc and measure to chassis / engine 0v. The pot, and sensor 0v return lines are not true 0v, but up on a small pedestal voltage to reduce noise susceptibility. Check this is the case, if not you have a short on the ecu sensor 0v rail. Please report these values back. Check the pot swings approx 0.25Vdc to 4.5Vdcmin on the wiper, note this measurement is against the pot 0v line not chassis for the reason above. Let me know how you get on.

Check loom continuity between the pack connector and the ecu as above.
Do you have a spare ignition unit?

I think it's great you guys give so much time and effort to helping out less knowledgeable fools like myself (no offence intended Phil ) keep these unreliable French jalopies functioning.

[phildini]

Thanks Mr M. I will check the above and let you know.... Both new and used crank sensors test as being good so I dont think its a inverted wire issue.

[stephendell]

Fit a Holley

Or the Holy of Holleys as it's now been christened.

[phildini]

All fixed!! many thanks guys, looks like the bloody ecu plug was not pushed in properly, well that's what I think it was as it's now working

If problem comes back then check the RENIX unit.
In the early days of ownership, I had a similar problem - crank it over and it didnt start. Thought it was the crankcase sensor, changed it, car started. Then failed a short time later, Turned out the RENIX unit was also effy.

I hate intermittent faults. Bad at the best of times, but then when mixed with French electrics turns into a nightmare.

.....looks like the bloody ecu plug was not pushed in properly,

Spray the male and female pins with switch cleaner/lubricant (Servisol Super 10) .....plug in and out two or three times.... final spray, then connect up. The cleaner will do what it says to the pins, and the lubricant will leave a film to protect against future surface corrosion.

Yeh, wot he said and then make sure you PLUG IT IN PROPERLY !!!

[phildini]

If problem comes back then check the RENIX unit.
In the early days of ownership, I had a similar problem - crank it over and it didnt start. Thought it was the crankcase sensor, changed it, car started. Then failed a short time later, Turned out the RENIX unit was also effy.

I hate intermittent faults. Bad at the best of times, but then when mixed with French electrics turns into a nightmare.

Yes, I now have a spare one in the car as I did remove the current one to check it, this was part of the three things I checked, TDC sensor, ECU and coil, did not replece anything but now it works

I know what you mean about intermittent faults, I don’t feel 100% comfortable when I drive it now, especially when I have Mini Dini in the car with me.

John I will spray all the connections with that fluid