Hi. I have a 2007 Volvo XC70 with 134K miles and has a check engine light. P0027. It has the 2.5L 5 cylinder. As I heard you say in some of your videos that the MAF data should be around the litters of the engine. When I switch over to metric, the freeze frame data shows that the engine is using about 3.97 grams per sec. See below for data. What could be the issue? Both the intake and exhaust solenoids were replaced by my mechanic and the intake error code went away but the exhaust still stays.
Here is the freeze frame data (all in US):
EQ Ratio: 0.999
Rel TPS %: 0.8
Ambient: 32 F
TPS B %: 12.2
ACC Pedal D %: 7.8
ACC Pedal E %: 7.8
Command TAC %: 1.2
Run Time (Sec): 3917
Command EVAP %: 0.0
BARO (InHg): 29.5
ECU Volts (V): 14.152
Load Value %: 15.7
EQ Ratio: 0.999
Fuel Pres (PSI): 43.9
Eng RPM: 977
Veh Speed (MPH): 28
Spark ADV (degress): 7.5
IAT: 46.4 F
MAF (lb/min): 0.5
TPS %: 12.2
Fuel Sys 1: CL
Fuel Sys 2: NA
Calc Load %: 12.2
ECT: 181.4 F
STFT B1 %: -1.6
LTFT B1 %: 1.6
All that data doesn't mean a thing unless you can actually verify that the wiring is intact and also there is a possibility of the ECM in itself is defective.
What causes the P0027 code?
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The ECM activates the exhaust valve solenoid without change to the different lift position.
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The exhaust valve lift solenoid has an open or short circuit causing the valve lift to not change.
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The wiring or connections to the exhaust valve lift solenoid is damaged causing a short or open circuit.
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The ECM is defective or the connection to the ECM is loosing contact.
