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Old 02-22-2009, 12:55 PM   #1
miroslavp
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check engine and VTM-4 light on

I have a Honda Ridgeline 2007 with 45K miles on it.Occasionally I get check engine and VTM-4 lamp,on. I ran a diagnosis and the computer showed two error codes. P0172 and P0175 (system too rich on both banks).
Possible causes:
-intake blocked
-evaporation canister purge valve
-fuel pressure
-EGR system
-injector(s)
-HO2S
Before anyone suggests I take my car to the dealership,my car is in Europe.
Does anyone know which one of these might be the problem?
The engine runs a bit rough when idle and sometimes turns off.
Otherwise the car runs well.
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Old 02-22-2009, 12:56 PM   #2
chisoxjim
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Re: check engine and VTM-4 light on

I had this issue a while back. There are a few threads on the topic I believe. My problem was from a tank of bad fuel. Fried the fuel injectors.

good luck
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Old 02-28-2009, 05:53 AM   #3
Some Mook
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Re: check engine and VTM-4 light on

Quote:
Originally Posted by miroslavp View Post
P0172 and P0175 (system too rich on both banks)....

-EGR system

...The engine runs a bit rough when idle and sometimes turns off.
What does the freeze data show for TPS and MAP when the DTC's set?

If the TPS was at 0.47 - 0.50 volts (meaning closed throttle) and MAP was greater than 1 volt (meaning higher than normal intake pressure), the odds are very good that the EGR valve was sticking open.

The EGR VLS parameter should be less than 1.2 volts at idle (ideally you'd see it at 1.13 - 1.15 volts.

An EGR valve that is sticking open can cause stalling at idle, and fuel system rich DTCs for both banks.

Take a look at the EGR VLS at idle with the engine warmed up, and also look at your MAP value - if both values are high, tap (lightly) on the side of the EGR valve with a screw-driver handle or small (2 oz) ball peen hammer. If both values drop when you do this (the idle will smooth out too), the valve pintle was sticking open, and you would be advised to replace the EGR valve.

BTW, you can ignore the VTM DTC (which was probably a 77-1 Powertrain System Failure) if the MIL was illuminated - the VTM code would have set simply because the PCM had set an MIL-request fault.

Last edited by Some Mook; 02-28-2009 at 05:56 AM.
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Old 02-28-2009, 07:32 AM   #4
Silver 3.5
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Re: check engine and VTM-4 light on

Bad gas could be the cause. I would check the air filter to make sure it's ok and that nothing found a home in the airbox or intake. I would be looking at the air mass sensor. Had a problem with a bad MAF on a different car that threw the same codes. Car ran ok but the light would come and go, then finally stayed on.
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