Had the dreaded MIL lamp come on the other day - first time ever in over 7 years. I suppose it's inevitable with so many sensors being monitored.
Hooked up Torque Pro, which came up with the above + "Range/Performance".
This is what the service manual says:
"The Inlet Pressure Sensor provides the ECM with the Barometric/Atmospheric Pressure signal. The ECM compares
the Atmospheric/Barometric signal to the signal of the Exhaust Pressure Sensor during low engine rpm (non-turbocharger
boost conditions) to determine the plausibility of these sensors.
- When Monitored:
Engine speed is below 670 rpm. There are no other Exhaust Pressure Sensor DTC’s. There are no Atmospheric/
Barometric Pressure Sensor DTC’s..
- Set Condition:
The difference between the Exhaust Pressure Sensor Signal and the Atmospheric/Barometric Pressure Signal
is greater than 400 hpa (5.8 psi.) for at least 3.0 seconds."
Now, 400 hpa is a huge difference between two sensors which are supposed to be measuring similar pressures, so I decided to check (with Torque Pro) the air inlet pressure. This came up as 980 hpa (or actually, 98 kpa, as per Torque Pro). I then checked my calibrated indoor barometer at 1000 hpa, so it does appear that the Exhaust Pressure Sensor is at fault.
The service manual contains a great deal of info on electrical diagnostics for this sensor, but I don't know whether I wish to go down this route and especially if it involves crawling under the car. I don't even know where the sensor is located, as the location shown in the manual assumes a single silencer.
I attempted to clear the DTC several times. On each occasion, Torque Pro stated that this couldn't be done, although the MIL lamp did extinguish, only to re-appear on the next start-up. So the fault looks genuine.
Has anyone seen this fault before and/or has any suggestions? My inclination is just to replace the sensor.
Hooked up Torque Pro, which came up with the above + "Range/Performance".
This is what the service manual says:
"The Inlet Pressure Sensor provides the ECM with the Barometric/Atmospheric Pressure signal. The ECM compares
the Atmospheric/Barometric signal to the signal of the Exhaust Pressure Sensor during low engine rpm (non-turbocharger
boost conditions) to determine the plausibility of these sensors.
- When Monitored:
Engine speed is below 670 rpm. There are no other Exhaust Pressure Sensor DTC’s. There are no Atmospheric/
Barometric Pressure Sensor DTC’s..
- Set Condition:
The difference between the Exhaust Pressure Sensor Signal and the Atmospheric/Barometric Pressure Signal
is greater than 400 hpa (5.8 psi.) for at least 3.0 seconds."
Now, 400 hpa is a huge difference between two sensors which are supposed to be measuring similar pressures, so I decided to check (with Torque Pro) the air inlet pressure. This came up as 980 hpa (or actually, 98 kpa, as per Torque Pro). I then checked my calibrated indoor barometer at 1000 hpa, so it does appear that the Exhaust Pressure Sensor is at fault.
The service manual contains a great deal of info on electrical diagnostics for this sensor, but I don't know whether I wish to go down this route and especially if it involves crawling under the car. I don't even know where the sensor is located, as the location shown in the manual assumes a single silencer.
I attempted to clear the DTC several times. On each occasion, Torque Pro stated that this couldn't be done, although the MIL lamp did extinguish, only to re-appear on the next start-up. So the fault looks genuine.
Has anyone seen this fault before and/or has any suggestions? My inclination is just to replace the sensor.