Intro - My buddy asked for help with his 94 Integra. It has OBD-0 running a Poor Man Type-R. We have got the car running (and looking) great, but we keep running into the CEL coming on with Code 7. TPS code. I know there are a million threads out there for this, but we are stumped and need the pros.

DIAG
- The first thing we did was try a new sensor. Code returned.
- Check calibration for sensor with Key On Engine Off. .48v TB closed, 4.5 TB wide open. Code returned. Recalibrated several times, Code returned.
- Checked continuity through all wiring from TPS to ECU. Wiring is OK.
- Backprobed ECU connectors for voltage. Voltage in spec.
- Installed Different ECU. Code returned.
- Backprobed ECU connector, and attached graphing multimeter for possible intermittent spikes. Code returned, with no spikes. Min voltage was .46v, max was 4.65v, with similar results for several test drives.


The voltage is in spec coming from the TPS, and to the ECU connector. I'm thinking that the ECU(s) HAVE be the issue, but I don't want to have him buy another ECU unless I can be 100%.

I am unsure due to the fact that it is OBD-0 and it is a Frankenstein motor into an LS body. I dont know enough about the swap to be certain what is happening. Thanks in advance for the help.

 

After re-reading my post, I realized that I only back probed the ECU connectors, and didn't test terminal tension or for voltage on the ECU side of the Connector.

Also, is code 7 specifically for a fault in the TPS Signal Voltage Wire? I'm thinking maybe I should triple check the reference and ground wires as well.

 

How are you tuning this properly? Not sure if there were ever any oem type r obd0 ecus or any tuning solutions for obd0.
I think the answer is getting an 0bd0 to obd1 harness and an obd1 hondata s300 or equivalent.

 

I dont know these old Hondas well, so I guess I dont know what the difference between OBD0 and 1 is. He claims its OBD-0. He has a JDM B16 ECU, and another chipped ECU that has a Type-R basemap.

I usually don'I work on anything pre-OBD2 because of stuff like this, but you know... Racecar.

Anyways, I'll look into that a bit more. Thank you.

 

Ob1 is the way to go on this chassis. I do not think obd0 or obd2 can be "chipped" on these cars.