I am hoping you may be able to help me. I am having an
intermittent check engine light. I purcahsed a code scanner and scanned
the computer. It says the mass airflow sensor is bad. I replaced the sensor
and it is still telling me it is bad. It is also telling
me that the fuel pump is bad. I have no starting problems, the car
starts up the first time everytime and does not hesitate during operation and
because of the mass airflow sensor issue I doubt the fuel pump is bad.
I also disconnected the mass airflow sensor and test drove it to see if
I noticed any performance problems and did. So I know the mass airflow sensor
thats on there is good.
I've reset the computer probably a dozen times. I've unplugged the battery and let
it sit for at least five minutes and then hook it back up. I then
drive the car for about five minutes and the check engine light
comes back on, however it does not stay on. It comes on and goes off.
I've also looked over the Haynes wiring schematic section for this vehicle.
The Massairflow sensor, fuel pump, and all of the EGR sensors are connected to
one another via the CCRM. So I am wondering if its possible that one
of the EGR sensors could be malfunctioning and causing the massairflow to cut on and cut off and for
whatever reason the computer is not putting out an error code for that sensor.
I've also had people suggest that the computer could be bad. Before I start replacing
the sensors I'd like to get a general idea of where or which one it is that
might be bad. Some of these sensors cost more then a used computer and
I don't want to have to start replacing them if I don't have to. I am also
wondering if it is possible that the computer could be bad.
The massairflow sensor is also connected to the CCRM, so I am wondering if
the Constant Control Relay Modual (CCRM) may be bad, but everyone
I have talked to all say no, that it does not control
or have anything to do with the Mass Airflow sensor but only the air
conditioning and the electric radiator fan. However on the wiring schematic
its dammn near connected to everything. So if it was going bad I don't understand why
it could not cause the problems I'm having, unless my Haynes wiring schematic is wrong.
I know from research of other vehicles the CCRM can cause problems simular to what I am having.
The A/C also does not work, which is plugged into the CCRM, but the A/C could just be a recharge issue.
The electric fan does work, which is why everyone says there is nothing wrong with the CCRM.
If the CCRM is bad, exactly where is it located and will I be able to find a part number for it because every place I have checked all tell me they don't know what I am talking about or they can't find a distributor that supplies it. Even some junk yards I've called have no idea what I am talking about when I say CCRM, or Constant Control Relay Modual. Also is it possible the name changed cause I've had that problem with a couple of parts on this car.
have the same problem?
Sunday, May 27th, 2007 AT 9:57 PM