Volvo Troubleshooting Questions? Ask a Mechanic for Answers ASAP
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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.
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