98 volvo glt. TPS
Engine light comes on about 10 seconds after starting. code says throttle position senor. replaced sensor and problem remains. oddly the CEL resets when turning off the engine and restarting, but the light pops on after about 10 secondes again, this with the new TPS installed. only recent problem was the fuel pump relay failure, which worked normally after replacement. any ideas? thanks.
Cars & Trucks - Volvo - S70
Answers & Comments
When you turn the vehicle on the PCM does a check on the system. For most sensors, it checks power and ground. Turns the light off if all is good. Since yours comes on after a few seconds, you need to check the signal return wire. Wires tend to break right at the plug. You'll need a volt/ohmmeter to check it. Also check the continuity of the wire from the TPS to the PCM. Anything over 5 ohms needs replaced. I just cut the wire and run a new one.