thetroublemaker
New member
Hi guys,
I have a 2000 model (old shape) volvo v70 with the AEL engine (called D5252t) running a MSA15.8 ecu.
I removed the vacuum pipe to the egr and blocked it but this has threw a code.
This engine has no sensor on the EGR itself being a conventional vacuum operated type, and I can see no flow sensors or otherwise in the inlet manifold, not can I see any reference to this in the wiring diagram.
The EGR controller is a 2 wire solenoid type with 2 vacuum hoses connected to it, 1 to vacuum source (vacuum pump) and one to the EGR.
So, my question is how did the ECU detect the EGR fail"? First thoughts are either the MAF sees some change in flow versus the lambda readings but this does seem unlikely to me, or the vacuum circuit somehow is monitored.
I also wonder if I can leave the EGR connected to the vacuum side of the circuit but block the either feed or outlet side (exhaust or inlet) without a code.
Any ideas? Volvo forums have thrown a blank so far., but I don't like being beaten by things.
I have a 2000 model (old shape) volvo v70 with the AEL engine (called D5252t) running a MSA15.8 ecu.
I removed the vacuum pipe to the egr and blocked it but this has threw a code.
This engine has no sensor on the EGR itself being a conventional vacuum operated type, and I can see no flow sensors or otherwise in the inlet manifold, not can I see any reference to this in the wiring diagram.
The EGR controller is a 2 wire solenoid type with 2 vacuum hoses connected to it, 1 to vacuum source (vacuum pump) and one to the EGR.
So, my question is how did the ECU detect the EGR fail"? First thoughts are either the MAF sees some change in flow versus the lambda readings but this does seem unlikely to me, or the vacuum circuit somehow is monitored.
I also wonder if I can leave the EGR connected to the vacuum side of the circuit but block the either feed or outlet side (exhaust or inlet) without a code.
Any ideas? Volvo forums have thrown a blank so far., but I don't like being beaten by things.