2008 Chevrolet Captiva DTC P2033 and P2084: Testing EGT Sensor Continuity and 5V Signal from ECU
Hello, I own a 2008 Chevrolet Captiva with a 2.0L diesel engine. The vehicle is showing diagnostic trouble codes P2033 and P2-084, both related to the Exhaust Gas Temperature (EGT) sensor. I recently replaced the EGT sensor (EGTS), but I want to verify that the old sensor was functioning correctly before replacement. According to technical references, when the EGT sensor is hot, it should show low resistance; when cold, high resistance. However, my test results are opposite — the sensor shows high resistance when hot and low resistance when cold. The EGT sensor has two wires: black and grey. I would like to confirm whether the 5-volt signal from the ECU to the EGT sensor should be measured at the connector where the sensor is plugged in, or at another point on the wiring harness. Additionally, I need clarification on which wire (black or grey) carries the positive (+) voltage and which is negative (-). Any guidance on proper testing procedures for this specific fault code would be greatly appreciated.
Hi all, I'm facing the same issue with my 2008 Captiva. The EGT sensor shows reversed resistance values — high when hot and low when cold. I've checked the wiring and voltage at the connector, but still can't confirm which wire is positive or negative. Any detailed testing steps for P2033 and P2084 on this model would be very helpful.