I have a problem with my temperature controls, a friend has pluged in his diagnostic tool and found the fault code C1 40 communication, central electronic module (CEM) signal missing. Is there a. Fix or part that needs replacement? The fault will not allow me to change the temperature while switched on if it wants to heat it will heat full pelt continuously, if I turn temp down to min nothing happens but if I switch ignition off having set it low and the restart engine it will then blow cold full pelt continuously. The same with the airflow direction controls.
SOURCE: Volvo v50 2005 climate control
I had the same problem. AC computer forgot where the adjustment flaps are.
- Start the car.
- Press Auto button on the AC (if you have this option)
- Increase fan speed (make shure it is not on minimmal setting)
- Decrease the temperature setting to the minimum -> "Lo"
- Wait about 10-20 seconds
- increase the temperature to the maximum -> "Hi"
- Wait about 10-20 seconds
- Set the temperature that you like.
With this procedure you force the AC to move the temperature regulating flaps to go to both end-positions and motors get calibrated again.
If this does not help, there must be a bad contact somewhere or the fpals may get stuck. -> repair.
SOURCE: Volvo V50, VIN YV1MW753152104530, engine D4204T.
Thanks for your interest, problem solved in local service workshop.
Regards,
Nenad Danicic
SOURCE: i have volvo s60 2004.i was driving my car when
could be the CEM which is the main computer in the whole car. or it could be a communication fault in the CAN network
SOURCE: volvo xc70 in limp mode 7 fault codes recorded d5
Possible problem with the alternator not putting out enough voltage. I had the same problem with my 2002 XC70, putting in a new alternator fixed it. I used a local mechanic who I found on the car talk web-site. Low Cost Volvo parts can be purchased at FCP Groton.
Check, test or replace MAF sensor.
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Testimonial: "my volvo "check engine light"problem solved after replacing MAF sensor. thanx to FixYa!!!!!!!!! "
Whenever this warning light or any
other stays on in the dash it is indicating that the systems control
module (or the system sensor in the case of lights like low oil
pressure, door open indicators etc.) has detected a fault, it then
disables the system (this applies to ABS,TCS, TCM, SRS, TPMS, MIL,
CEL and BCM faults and others) as long as the light is on. You must
now have the dealer hook up a special electronic diagnostic tool and
"scan" the system for the fault code that is stored for the
problem(s)
Legend of Abbreviations. ABS Anti-lock brake system. TCS Traction control system, TCM Transmission control module, SRS Supplemental restraint system, BCM Body control module. TPMS Tire Pressure Monitor System, MIL Malfunction Indicator Lamp, CEL Check Engine Light.
TH2TNK Sensor Value Offset Shifting
Possible failuer of OBD II Fault code P1F68
Hello
The
Engine and Automatic Transmission (not applicable to manual
transmissions) in this vehicles drive train are fully electronically
controlled by a computer called the PCM and TCM (Power Train Control
Module, Transmission Control Module). When a problem like this or
other drive-ability related problems occurs the computer stores a
record of the problem (there are of course some exceptions to this,
like the fuel pump, engine coolant temperature sensor and MAF sensor
for instance) in the form of a fault code in its memory, to read
these fault codes you must have the systems memory scanned with a
special tool. Once the fault code(s) are read you then must perform
the appropriate diagnostic testing to find and resolve the
problem(s) DO NOT REPLACE ANY PARTS UNTIL A TRAINED
TECHNICAIN HAS DIAGNOSED THE PROBLEM TO AVOID SPENDING YOUR HARD
EARNED MONEY ON PARTS THAT MAY NOT CORRECT THE PROBLEM. Also always
check fuel pressure for correct spec for your make and engine type.
When the service engine soon light (Also called the check engine light or engine management light) is turned on this is to alert you to the fact that Powertrain Control Module (computer) has detected a failure somewhere in the systems it controls you may not feel any difference in the way the engine runs, this can be the transmission or the engine or emission system, there are fault codes set in the modules memory for these faults. What needs to happen now is to have the powertrain control module scanned with a special tool called an OBD2 electronic engine control scanner or a OBD2 code reader. Once the code(s) are read then you must perform the diagnostics for each code and make the appropriate repairs based on the findings of the diagnosis that was performed, this is called doing "Pinpoint" testing.
Hello
The engine
and transmission in this cars drive train are fully
electronically controlled by a computer called the PCM (Power Train
Control Module). Whenever a problem like this occurs the computer
stores a record of the problem (there are of course some exceptions
to this, like the fuel pump, engine coolant temperature sensor and
MAF sensor for instance) in the form of a fault code in its memory,
to read these fault codes you must have the systems memory scanned
with a special tool. Once the fault code(s) are read you then must
perform the appropriate diagnostic testing to find and resolve the
problem(s) DO NOT REPLACE ANY PARTS UNTIL A TRAINED TECHNICAIN
HAS DIAGNOSED THE PROBLEM TO AVOID SPEDING YOUR HARD EARNED MONEY ON
PARTS THAT MAY NOT CORRECT THE PROBLEM
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