Have Volvo Questions? Ask a Volvo Mechanic for Answers ASAP
Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.
From what you have described here this does sound like you have a faulty ECM or wiring damage at the ECM.The ECM monitors the maf,coolant temp and oxygen sensors and also sends signals to the fan control module for operation.The only other issue I would see here that can cause all of these is faulty wiring leading from the engine coolant temp sensor to the ECM.This can cause false readings and in return the computer expects to see certain signals from the other sensors and can set codes for them.
Inspect the wiring from the engine coolant temp sensor and at the ECM and in the harness between the two for any issues.If no faults are found then I suspect the ECM will need replaced to correct this fault here.
If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service.You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.