o2 circuit wiring help
Thread Starter
I'm made of meat!
Joined: Mar 2003
Posts: 3,580
Likes: 0
From: Richmond, VA
o2 circuit wiring help
I have a 92 CX hatch. It uses a 1-wire o2 sensor.
I have a 92 CX engine wiring harness that only has a 1-wire connector.
I have a 92 DX ECU. It's looking for a 4-wire o2 sensor and throwing ECU codes becuase the heater circuit isn't there.
What connector, and where do these heater circuit wires connect on the harness?
Wire color, pin number and plug number would be helpful. I can't read the HELM manual as the download isn't high enouh resolution. If someone has a printed copy and can look up the info it would be great! It's on the last page. The connector numbers are at the beginning of the chapter (section 23), and also notated on the main diagram. I don't know where the pin numbers match up as I can't find the connector pin-out numbers in here, so that's why I need wire color (before the engine wiring harness).
...or if someone can scan the last pages at 200dpi (the pages with the main electrical diagram) and email me a .jpg at cheapdsmbastard@yahoo.com... I could figure it out.
My CX doesn't have these wires or the dx o2 sensor connector, so I need to splice them in order to avoid rewiring my car. It's only 3 wires. If someone could help me sort this out it would be very appreciated. I'm so close to finishing this swap.
I have a 92 CX engine wiring harness that only has a 1-wire connector.
I have a 92 DX ECU. It's looking for a 4-wire o2 sensor and throwing ECU codes becuase the heater circuit isn't there.
What connector, and where do these heater circuit wires connect on the harness?
Wire color, pin number and plug number would be helpful. I can't read the HELM manual as the download isn't high enouh resolution. If someone has a printed copy and can look up the info it would be great! It's on the last page. The connector numbers are at the beginning of the chapter (section 23), and also notated on the main diagram. I don't know where the pin numbers match up as I can't find the connector pin-out numbers in here, so that's why I need wire color (before the engine wiring harness).
...or if someone can scan the last pages at 200dpi (the pages with the main electrical diagram) and email me a .jpg at cheapdsmbastard@yahoo.com... I could figure it out.
My CX doesn't have these wires or the dx o2 sensor connector, so I need to splice them in order to avoid rewiring my car. It's only 3 wires. If someone could help me sort this out it would be very appreciated. I'm so close to finishing this swap.
Senior Member
Joined: Mar 2002
Posts: 1,108
Likes: 0
Thread Starter
I'm made of meat!
Joined: Mar 2003
Posts: 3,580
Likes: 0
From: Richmond, VA
Wow, that was fast. That's almost exactly what I needed. I have a DX sensor so the parts are already available to me, but...
The problem is that my DX ECU is looking for voltage on the heater circuit, so I actually have to wire it in on the harness and it's not covered in that FAQ. I'll still get a CEL. If the CEL is on, won't my ECU stay in open loop (safe mode)?
The engine harness to the ECU is complete, but where it connects to the engine harness in the bay, there are blocked off connectors. The CX harness is the same as the DX, it's just missing some wires. If I match the ends up, it will shut the CEL off.
The problem is that my DX ECU is looking for voltage on the heater circuit, so I actually have to wire it in on the harness and it's not covered in that FAQ. I'll still get a CEL. If the CEL is on, won't my ECU stay in open loop (safe mode)?
The engine harness to the ECU is complete, but where it connects to the engine harness in the bay, there are blocked off connectors. The CX harness is the same as the DX, it's just missing some wires. If I match the ends up, it will shut the CEL off.