Hi Everyone
Thought I'd see if there's any guru's here to help solve this PITA issue.
Anyhow, here's the basics:
1999 D2
Symptoms
Does crank
Does have spark
Does run if I spray starter down the throttle body
No DTC's
How it died
On the freeway and put my foot down. At the lights it was spluttering but recovered. After two stops later (10 minutes each stop and around an hour all up), I then started it up again. I put it in reverse and about 10m/30ft later while reversing, it came to a halt with lots of spluttering and it seemed it ran out of fuel. I still have half a tank of fuel.
What's happening:
The ECM is supplying a 5.5V to one side of the Fuel Pump Relay energizing coil, so no fuel pressure
The ECM is supplying a 5.5V to one side of the Injectors, so they're not firing
Conclusion
The Motronic ECM has "fuel cut off strategy" enabled and will not supply 0V to the Fuel Pump Relay and, as such, no fuel pressure. Also, the injectors are not being fired as a result of this "fuel cut off" strategy as well.
The Body Control Unit follows this procedure and it's here I believe is where the issue is:
When the engine is cranking, the ECM looks for a coded signal from the BCU. If the signal is not received within one second of cranking, the fuel supply to the engine is stopped and the injectors are disabled. This also prevents unburned fuel from entering the catalyst.
What I have done:
1) I checked for a spark & all OK
2) I could not hear the fuel pump so I checked for fuel pressure and no pressure
3) I checked the voltage at the fuel pump and it read 0V
4) I checked the Fuel Pump Relay and all OK
5) I found out about "fuel cut off strategy"
6) I checked and even bypassed Inertia Switch
7) I replaced the CKP Sensor
8) I replaced the MAF
9) I supplied 0V to the Fuel Pump relay so I had fuel pressure. Still no start due to injectors
What I'm doing now
1) Getting pissed off
2) Finding out what else the ECM takes into account to trigger the "fuel cut off strategy"
If anyone has any ideas, your input would be much appreciated.
Cheers
Erron
Thought I'd see if there's any guru's here to help solve this PITA issue.
Anyhow, here's the basics:
1999 D2
Symptoms
Does crank
Does have spark
Does run if I spray starter down the throttle body
No DTC's
How it died
On the freeway and put my foot down. At the lights it was spluttering but recovered. After two stops later (10 minutes each stop and around an hour all up), I then started it up again. I put it in reverse and about 10m/30ft later while reversing, it came to a halt with lots of spluttering and it seemed it ran out of fuel. I still have half a tank of fuel.
What's happening:
The ECM is supplying a 5.5V to one side of the Fuel Pump Relay energizing coil, so no fuel pressure
The ECM is supplying a 5.5V to one side of the Injectors, so they're not firing
Conclusion
The Motronic ECM has "fuel cut off strategy" enabled and will not supply 0V to the Fuel Pump Relay and, as such, no fuel pressure. Also, the injectors are not being fired as a result of this "fuel cut off" strategy as well.
The Body Control Unit follows this procedure and it's here I believe is where the issue is:
When the engine is cranking, the ECM looks for a coded signal from the BCU. If the signal is not received within one second of cranking, the fuel supply to the engine is stopped and the injectors are disabled. This also prevents unburned fuel from entering the catalyst.
What I have done:
1) I checked for a spark & all OK
2) I could not hear the fuel pump so I checked for fuel pressure and no pressure
3) I checked the voltage at the fuel pump and it read 0V
4) I checked the Fuel Pump Relay and all OK
5) I found out about "fuel cut off strategy"
6) I checked and even bypassed Inertia Switch
7) I replaced the CKP Sensor
8) I replaced the MAF
9) I supplied 0V to the Fuel Pump relay so I had fuel pressure. Still no start due to injectors
What I'm doing now
1) Getting pissed off
2) Finding out what else the ECM takes into account to trigger the "fuel cut off strategy"
If anyone has any ideas, your input would be much appreciated.
Cheers
Erron
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