theoneandonly
Established member
There are quite a few members here with Multiecuscan MES.
there must be expertise here to diagnose various sensors. Ive looked at yutube etc and seen videos with different scanners and measurement values or a multimeter but what PIDs with MES?
So how diagnose various sensors with MES?
I'm thinking MAF and MAP and any others would be handy.
I'll start ball rolling with the DPF Differential Pressure. known in mes parameter list as Differential Pressure Sensor.
Differential Pressure Sensor signal is measured in mV. Ive not measured this.
What is an acceptable figure for DPF Differential Pressure (measured in mbar)? The answer is as little as possible. But if it flatlines at zero its dead.
Adding back pressure will make the engine work harder, and use more fuel to deliver the same power.
<20 Brilliant DPF causing almost no restriction
20-99 Good result and typical of a DPF in good working order
100-250 DPF causing up to 0.25 BAR of pressure – needs investigation
250-500 Serious restriction probably not allowing car to do a Forced Regen
500-1000 Performance loss very marked at this level
>1000 Car can’t pull the proverbial skin off a rice pudding. All your boost is stuck in the DPF
Some example graphs
Test 3 DPF clogged was trying to regen every 70miles
Test 1 regen very 314 miles
there must be expertise here to diagnose various sensors. Ive looked at yutube etc and seen videos with different scanners and measurement values or a multimeter but what PIDs with MES?
So how diagnose various sensors with MES?
I'm thinking MAF and MAP and any others would be handy.
I'll start ball rolling with the DPF Differential Pressure. known in mes parameter list as Differential Pressure Sensor.
Differential Pressure Sensor signal is measured in mV. Ive not measured this.
What is an acceptable figure for DPF Differential Pressure (measured in mbar)? The answer is as little as possible. But if it flatlines at zero its dead.
Adding back pressure will make the engine work harder, and use more fuel to deliver the same power.
<20 Brilliant DPF causing almost no restriction
20-99 Good result and typical of a DPF in good working order
100-250 DPF causing up to 0.25 BAR of pressure – needs investigation
250-500 Serious restriction probably not allowing car to do a Forced Regen
500-1000 Performance loss very marked at this level
>1000 Car can’t pull the proverbial skin off a rice pudding. All your boost is stuck in the DPF
Some example graphs
Test 3 DPF clogged was trying to regen every 70miles
Test 1 regen very 314 miles
