Hi guys, I've just installed the MAP-ECU3 on my truck and I got the same code, P2238. Says Bank 1 Sensor 1, so I assume this is the passanger side sensor. I just replaced my harness, so I am suspecting the harness. I would like to thank Torspd for the link to the PDF file, I'll go through the troubleshooting steps. Just to clarify, Bank 1 is the passenger side, yes? Since Cylinder 1 is on the passenger side.
I tried swapping the two front sensors, but the Code remained the same, Bank 1 Sensor 1. This means my problem is most likely from the harness.
Also, I did an OBDII scan and monitored the open loop and fuel trims, but it seems the Bank 1 sensor is never getting hot enough to activate, until the ECU gives up and triggers the code. The Bank 1 Short Term Fuel Trims are not starting, but Bank 2 starts even when it is still in open loop, giving me a reading. This is until it goes to Fail mode and stops displaying anything. Here's a screenshot of my OBDII readout:
I've added some tiny gauges to observe the voltage on all four sensors, and they seem to all give proper voltage, although it seems the rear sensors are showing that I'm too lean (low 0.2 Volts). So if both front sensors are getting voltage, then why is one of them seemingly malfunctioning?
Also, I noticed when I swapped the AFR sensors that the sensor on the passenger side seemed to have a lot more carbon deposits on it than the passenger side, which seems quite strange, and it shows in the tiny voltage gauges that one side is rich and the other side is lean. I wonder why it's doing that?
I'll find out more tomorrow as I go through the troubleshooting steps in the PDF.
I tried swapping the two front sensors, but the Code remained the same, Bank 1 Sensor 1. This means my problem is most likely from the harness.
Also, I did an OBDII scan and monitored the open loop and fuel trims, but it seems the Bank 1 sensor is never getting hot enough to activate, until the ECU gives up and triggers the code. The Bank 1 Short Term Fuel Trims are not starting, but Bank 2 starts even when it is still in open loop, giving me a reading. This is until it goes to Fail mode and stops displaying anything. Here's a screenshot of my OBDII readout:
I've added some tiny gauges to observe the voltage on all four sensors, and they seem to all give proper voltage, although it seems the rear sensors are showing that I'm too lean (low 0.2 Volts). So if both front sensors are getting voltage, then why is one of them seemingly malfunctioning?
Also, I noticed when I swapped the AFR sensors that the sensor on the passenger side seemed to have a lot more carbon deposits on it than the passenger side, which seems quite strange, and it shows in the tiny voltage gauges that one side is rich and the other side is lean. I wonder why it's doing that?
I'll find out more tomorrow as I go through the troubleshooting steps in the PDF.
