Check Engine Diagnostics Help
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Check Engine Diagnostics Help
I have a 2005 XC90 2.5 Turbo.
Onboard computer states I get an average of 15mpg but when I refuel and divide miles driven by fuel added, it equates to 22mpg.
The check engine light came on a month ago. Did diagnostic scans from multiple auto repair shops with a code of P2177 (bank 1 lean). I have replaced the MAS (diagnostic reveals 0.83 mg/cm when it should be 1.0 thus the CPU is adding more fuel to compensate for lower value on MAS,therefore, onboard computer shows lower mpgs and triggering the check engine light). I also replaced the fuel pressure sensor, fuel filter, and upstream O2 sensor. Did not take care of problem and still pulls code. Took it to a Volvo dealer yesterday. Their diagnostic reveals the following:
ECM-212C (Long term fuel trim, bank 1 - Signal too high
ECM-21EC (Long term fule trim, bank 1 - Signal too high
Tech at dealer replaced the following to attempt correcting the problem:
Oil trap & attendant components, cleaned throttle & PCV nipple, downloaded ECM software upgrade and replaced various hoses.
They obviously don't know how to fix it. Does anyone know if it is a correlation between the onboard computer and acutual mpg, which pulls the check engine light???????
Onboard computer states I get an average of 15mpg but when I refuel and divide miles driven by fuel added, it equates to 22mpg.
The check engine light came on a month ago. Did diagnostic scans from multiple auto repair shops with a code of P2177 (bank 1 lean). I have replaced the MAS (diagnostic reveals 0.83 mg/cm when it should be 1.0 thus the CPU is adding more fuel to compensate for lower value on MAS,therefore, onboard computer shows lower mpgs and triggering the check engine light). I also replaced the fuel pressure sensor, fuel filter, and upstream O2 sensor. Did not take care of problem and still pulls code. Took it to a Volvo dealer yesterday. Their diagnostic reveals the following:
ECM-212C (Long term fuel trim, bank 1 - Signal too high
ECM-21EC (Long term fule trim, bank 1 - Signal too high
Tech at dealer replaced the following to attempt correcting the problem:
Oil trap & attendant components, cleaned throttle & PCV nipple, downloaded ECM software upgrade and replaced various hoses.
They obviously don't know how to fix it. Does anyone know if it is a correlation between the onboard computer and acutual mpg, which pulls the check engine light???????
Last edited by getagrp1k; Dec 12, 2010 at 04:03 PM.
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Joined: Mar 2009
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From: Albuquerque, NM
I have a 2005 XC90 2.5 Turbo.
Onboard computer states I get an average of 15mpg but when I refuel and divide miles driven by fuel added, it equates to 22mpg.
The check engine light came on a month ago. Did diagnostic scans from multiple auto repair shops with a code of P2177 (bank 1 lean). I have replaced the MAS (diagnostic reveals 0.83 mg/cm when it should be 1.0 thus the CPU is adding more fuel to compensate for lower value on MAS,therefore, onboard computer shows lower mpgs and triggering the check engine light). I also replaced the fuel pressure sensor, fuel filter, and upstream O2 sensor. Did not take care of problem and still pulls code. Took it to a Volvo dealer yesterday. Their diagnostic reveals the following:
ECM-212C (Long term fuel trim, bank 1 - Signal too high
ECM-21EC (Long term fule trim, bank 1 - Signal too high
Tech at dealer replaced the following to attempt correcting the problem:
Oil trap & attendant components, cleaned throttle & PCV nipple, downloaded ECM software upgrade and replaced various hoses.
They obviously don't know how to fix it. Does anyone know if it is a correlation between the onboard computer and acutual mpg, which pulls the check engine light???????
Onboard computer states I get an average of 15mpg but when I refuel and divide miles driven by fuel added, it equates to 22mpg.
The check engine light came on a month ago. Did diagnostic scans from multiple auto repair shops with a code of P2177 (bank 1 lean). I have replaced the MAS (diagnostic reveals 0.83 mg/cm when it should be 1.0 thus the CPU is adding more fuel to compensate for lower value on MAS,therefore, onboard computer shows lower mpgs and triggering the check engine light). I also replaced the fuel pressure sensor, fuel filter, and upstream O2 sensor. Did not take care of problem and still pulls code. Took it to a Volvo dealer yesterday. Their diagnostic reveals the following:
ECM-212C (Long term fuel trim, bank 1 - Signal too high
ECM-21EC (Long term fule trim, bank 1 - Signal too high
Tech at dealer replaced the following to attempt correcting the problem:
Oil trap & attendant components, cleaned throttle & PCV nipple, downloaded ECM software upgrade and replaced various hoses.
They obviously don't know how to fix it. Does anyone know if it is a correlation between the onboard computer and acutual mpg, which pulls the check engine light???????
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