Fuel Pump relay doesn't turn the pump on so I jumped 87 and 30 with a jumper
Fuel is present at the rail
Checked Crank Sensor Resistance - within spec
Spark was checked with an timing gun -blinks so there must be spark right?
Pulled a spark plug can't smell fuel.
Pulled spark plug out and grounded sparks when cranking
hmmm....
checked the injectors today.
Resistance at the coils are at 16.3 ohms within spec as per the Bently
There is 12V at the injector when the engine cranks
That should mean the DME is ok right?
Did the following checks at the DME harness as per the Bentley
-Voltage Supply at the control unit - ok
-Fuel Pump relay control - ok
-Fuel Injector control - ok on both banks
-Main relay control -ok
Checked Fuel Pressure at the rail with the fuel pump jumped.
45 PSI with pump on
40 PSI residual
I also checked the terminals at the relay socket
#30 and ground = battery voltage
#86 and ground = battery voltage
multi meter on #85 & #86 turn key to on = battery voltage
multi meter on #85 & #86 turn key to crank = battery voltage
Also checked voltage at the fuel pump - nothing with the relay, battery voltage when jumped.
Continued to do some continuity checking
DME #3 and Fuel Pump relay #85 = 0.9 ohms
This tells me the wire between my DME and relay is ok - there is a connection
This is a strange one, I remove the relay socket from the holder and inserted the tester into the rear of Fuel Pump Relay #85 = Ground when off; 12V When Key on
I take the relay out and its ground again? What the fuck?
This is why the pumps are not turning on, it sounds like a bad or disconnected ground
So I continue with checking the DME's grounds
DME #2,14,19,24 continuity to grounds = 0.8 ohms
- meaning good grounds
Check Power at DME
#27 = 12V
#18 = 12V
Power is going to the DME
Check CPS resistance again @ the DME #47 & 48 = 508 ohms (within spec)
And check Main Relay DME #36 and main relay #85 = continuity 0.8 ohms
What's wrong with my car?
I also bought a new relay and plugged it in, still nothing.
Swapped DME's for a known good one - still no luck
The car runs when the fuel pump relay is jumped but doesn't when the relay is installed.
Last thing does the 325i prime the pumps when you turn the key to start or does it just pump when cranking?
Fuel is present at the rail
Checked Crank Sensor Resistance - within spec
Spark was checked with an timing gun -blinks so there must be spark right?
Pulled a spark plug can't smell fuel.
Pulled spark plug out and grounded sparks when cranking
hmmm....
checked the injectors today.
Resistance at the coils are at 16.3 ohms within spec as per the Bently
There is 12V at the injector when the engine cranks
That should mean the DME is ok right?
Did the following checks at the DME harness as per the Bentley
-Voltage Supply at the control unit - ok
-Fuel Pump relay control - ok
-Fuel Injector control - ok on both banks
-Main relay control -ok
Checked Fuel Pressure at the rail with the fuel pump jumped.
45 PSI with pump on
40 PSI residual
I also checked the terminals at the relay socket
#30 and ground = battery voltage
#86 and ground = battery voltage
multi meter on #85 & #86 turn key to on = battery voltage
multi meter on #85 & #86 turn key to crank = battery voltage
Also checked voltage at the fuel pump - nothing with the relay, battery voltage when jumped.
Continued to do some continuity checking
DME #3 and Fuel Pump relay #85 = 0.9 ohms
This tells me the wire between my DME and relay is ok - there is a connection
This is a strange one, I remove the relay socket from the holder and inserted the tester into the rear of Fuel Pump Relay #85 = Ground when off; 12V When Key on
I take the relay out and its ground again? What the fuck?
This is why the pumps are not turning on, it sounds like a bad or disconnected ground
So I continue with checking the DME's grounds
DME #2,14,19,24 continuity to grounds = 0.8 ohms
- meaning good grounds
Check Power at DME
#27 = 12V
#18 = 12V
Power is going to the DME
Check CPS resistance again @ the DME #47 & 48 = 508 ohms (within spec)
And check Main Relay DME #36 and main relay #85 = continuity 0.8 ohms
What's wrong with my car?
I also bought a new relay and plugged it in, still nothing.
Swapped DME's for a known good one - still no luck
The car runs when the fuel pump relay is jumped but doesn't when the relay is installed.
Last thing does the 325i prime the pumps when you turn the key to start or does it just pump when cranking?
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