Citroen Xantia intermittent starting
Variant: 2.0 Hdi
Model Year: 2000
Categories:
Electrics, ECU, Warnings & Lights
I'm still trying to fix a very intermittent no start fault.
1) On attempting to start no volts appear across the pump motor, this is before the engine is cracked.
2) The fuel pump relay has been replaced
3) Under normal start conditions, 12 volts appear across the pump for 4 seconds then disappear, if the engine is then cranked, volts appear and all starts as normal.
4) I have yet to determine if relays "click" under fault conditions
5) Have heated up ECU with hairdryer, no effect, all normal.
Any suggestions gratefully received. Regards David T
1) On attempting to start no volts appear across the pump motor, this is before the engine is cracked.
2) The fuel pump relay has been replaced
3) Under normal start conditions, 12 volts appear across the pump for 4 seconds then disappear, if the engine is then cranked, volts appear and all starts as normal.
4) I have yet to determine if relays "click" under fault conditions
5) Have heated up ECU with hairdryer, no effect, all normal.
Any suggestions gratefully received. Regards David T
Posted: Aug 20, 2015 (9 years ago)
While heating up the ECU with a hair dryer "might " help if there's a water problem I won't help if there's water inside,
quite the opposite!
I think I recall your last post and I'm pretty sure back then I stated that the ECU controls the Ground side of the relay that feeds the pump.
That hasn't changed,
The ECU grounds out the relay,
this activates the relay which switches on and powers the pump.
Now as your pump sometimes works the pump and wiring are most likely ok.
New relay takes that out of the picture so that leaves an intermittent fault internal to the ECU.
Providing the ECU power and grounds are good.
And again you failed to state the correct details to point you to which ECU terminals to check.
ENGINE SIZE/TYPE AND FUEL TYPE!!!!!
The wiring isn't the same for a 1.4 to a 2.0 D.
Either submit said details or bite the bullet and send the ECU off for testing.
quite the opposite!
I think I recall your last post and I'm pretty sure back then I stated that the ECU controls the Ground side of the relay that feeds the pump.
That hasn't changed,
The ECU grounds out the relay,
this activates the relay which switches on and powers the pump.
Now as your pump sometimes works the pump and wiring are most likely ok.
New relay takes that out of the picture so that leaves an intermittent fault internal to the ECU.
Providing the ECU power and grounds are good.
And again you failed to state the correct details to point you to which ECU terminals to check.
ENGINE SIZE/TYPE AND FUEL TYPE!!!!!
The wiring isn't the same for a 1.4 to a 2.0 D.
Either submit said details or bite the bullet and send the ECU off for testing.
Posted Aug 20, 2015 (9 years ago)
Have you had a look at this similar problem:
This message was auto-generated based on a user suggestion.
This message was auto-generated based on a user suggestion.
Posted Oct 22, 2015 (9 years ago)
my car was parked over and engine was off for 2days.suddenly the radiator fans started to run ,I saw that all the indicator lights are also on without anybody switching the car on.the engine also didn't turn on by starting,couldn't find the problem!
Posted Oct 22, 2015 (9 years ago)
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