Tech, I was hoping the problem was somewhere else. I will take it to a dealer and prepare for the worst. Thank you for your help. I'll reply back in a couple of weeks with the solutionwhen this gets resolve.

 

Hope it is something that is pretty simple.

 

Tech, I received the diagnosticcode sheet from my local Volvo dealer(who placed repairs in excess of ($5,000). The followingare present: ECM-1600, ECM4020, ECM9530, ECM5000, ECM8010 and ECM2000. My question is could a bad voltage regulator8010) cause the high signals on these other sensors(except the coolant temp sensor too low) or are they fuse protected?

 

Not sure if it could.
What is it charging at?

 

Tech, Thanks for your response. I don't know. I'll test it this weekend. I did retest the coolant temp sensor with engine on and at 80 degrees it'sshowing 3.7 volts. Still not reading temp. on the inst. cluster.

 

Maybe there is something in the cluster that is burned out.

I wish I could help you more. But I am about out of ideas.

 

Tech, I thought I would update you on my findings since the trip to the dealer. I decided to retest the voltage on the involved sensors. I found the coolant temperature sensor ground wire to the ECM was reading 11.5 volts(It's suppose to read low voltage as per VADIS). I began exposing and tracing the wiring and found several areas where cracked wire inside the heat protectant wrap had lead to contact to higher voltage components. While the heat loom was intact, wiring on top of the engine degraded. After separating the the wires in the harness and taping the damaged areas, the voltage at the ground wire reads 4.5 volts. This weekend I am going to expose the wiring to the other sensors and try to locate the short.

 

Thanks looks like you are tracking it down slowly.