#AUDI A4 COOLANT TEMP SENSOR SYMPTOMS HOW TO#

#AUDI A4 COOLANT TEMP SENSOR SYMPTOMS HOW TO#

If you’re unsure of how to diagnose a PCM, do not attempt. If it isn’t present after removing the wire and checking the pin, replace PCM NOTE: Usually, P0118 Audi is indicative of a bad temperature sensor, but doesn’t rule out these other possibilities. If it’s present now, repair short on the circuit.

If you do not, remove the offending wire from the PCM and then check for proper voltage at the PCM pin. If you have these at the PCM connector, then repair open or short between the PCM and the sensor. and/or ground continuity, check for these back at the PCM connector. Also check for ground presence at the connector. Check for 5 volts reference voltage at the connector. If not, there is likely a problem with the ground circuit or voltage supply. The temperature reading should now be maxed out to above 250 degrees F.

If it is in specifications, unplug the sensor and, using a fused jumper wire, jumper the two terminals of the connector together.

If the scan tool reads an illogical temperature, check the resistance of the temperature sensor. Drop-outs would indicate a bad connection. Perform a “wiggle” test by wiggling the connector and harness to the sensor while watching the reading on the scan tool. Does it read a logical number? If so, the problem is likely intermittent. First, if you have access to a scan tool, check the reading of the coolant sensor.

Audi a4 coolant temp sensor symptoms