aasarsak
New Member
I have been scourning the internet and this site for an answer, and I haven't been able to find one. Her is the situation:
Normally, when I turn the key to position 2 (ignition run), the yellow check engine light comes on for about 2 seconds, then it clicks back off. Normally, I hear the fuel pump humming as it primes the fuel lines during this 2 second period. Recently, I installed a Neptune RTP equipped P28 ECU from this place called xenocron.com for an OBD0 - OBD1 conversion. Ever since I installed the new ECU, 2 things have happened.
1. I have a CEL code for ELD. I have no idea what ELD or how to diagnose the problem. I have replaced the ELD, yet I am still getting the code.
2. The CEL no longer comes on for 2 seconds when I key the ignition on with the engine off (KOEO). Also, I can't hear my fuel pump priming the fuel line before starting the car.
The car starts and runs fine except that sometimes during long freeway trips, the fuel cuts out. I can tell because I have a wideband sensor and it goes to full lean and I can feel the loss of power. If I press the gas pedal in a little bit, it goes back to full rich and it resumes running stoich until I go back to constant throttle cruising.
The fuel cutting problem has been going on since before I did the OBD conversion, so I don't know if any of these problems are related.
The EF service manual gives troubleshooting steps to check the main relay harness. Following the procedures, I found that putting a jumper wire between the #5 and #7 ports of the main harness cause the fuel pump and the CEL to activate when the KOEO.
I followed the recommended procedures for troubleshooting the main relay and it appears to be fine. I thought maybe I performed the troubleshooting incorrectly, so I went ahead and bought a new one anyway, and the problem is still there.
Due to the fact that the fuel pressure regulator indicates constant fuel pressure combined with the fact that the fuel pump activates with the jumper wire on the main relay harness, I have eliminated a faulty fuel pump a a possible culprit.
The only thing left that I think might be causing the problem might be the ECU, but I can't figure out how to diagnose a faulty ECU, or if I have made a mistake somewhere during my troubleshooting process.
Anyone have any suggestions?
Oh, my setup I think is irrelevant to the situation, but here it is just for reference purposes I guess:
89 civic si
b16A
OBD1 conversion
innovate LC-1 wideband kit
drag t3/t04 turbo kit (FMU and MAP bypass removed)
NEPTUNE RTP with P28 (tuned by Church Automotive in Long Beach, CA)
walbro 255lph fuel pump
stock b16 injectors
B&M FPR
Normally, when I turn the key to position 2 (ignition run), the yellow check engine light comes on for about 2 seconds, then it clicks back off. Normally, I hear the fuel pump humming as it primes the fuel lines during this 2 second period. Recently, I installed a Neptune RTP equipped P28 ECU from this place called xenocron.com for an OBD0 - OBD1 conversion. Ever since I installed the new ECU, 2 things have happened.
1. I have a CEL code for ELD. I have no idea what ELD or how to diagnose the problem. I have replaced the ELD, yet I am still getting the code.
2. The CEL no longer comes on for 2 seconds when I key the ignition on with the engine off (KOEO). Also, I can't hear my fuel pump priming the fuel line before starting the car.
The car starts and runs fine except that sometimes during long freeway trips, the fuel cuts out. I can tell because I have a wideband sensor and it goes to full lean and I can feel the loss of power. If I press the gas pedal in a little bit, it goes back to full rich and it resumes running stoich until I go back to constant throttle cruising.
The fuel cutting problem has been going on since before I did the OBD conversion, so I don't know if any of these problems are related.
The EF service manual gives troubleshooting steps to check the main relay harness. Following the procedures, I found that putting a jumper wire between the #5 and #7 ports of the main harness cause the fuel pump and the CEL to activate when the KOEO.
I followed the recommended procedures for troubleshooting the main relay and it appears to be fine. I thought maybe I performed the troubleshooting incorrectly, so I went ahead and bought a new one anyway, and the problem is still there.
Due to the fact that the fuel pressure regulator indicates constant fuel pressure combined with the fact that the fuel pump activates with the jumper wire on the main relay harness, I have eliminated a faulty fuel pump a a possible culprit.
The only thing left that I think might be causing the problem might be the ECU, but I can't figure out how to diagnose a faulty ECU, or if I have made a mistake somewhere during my troubleshooting process.
Anyone have any suggestions?
Oh, my setup I think is irrelevant to the situation, but here it is just for reference purposes I guess:
89 civic si
b16A
OBD1 conversion
innovate LC-1 wideband kit
drag t3/t04 turbo kit (FMU and MAP bypass removed)
NEPTUNE RTP with P28 (tuned by Church Automotive in Long Beach, CA)
walbro 255lph fuel pump
stock b16 injectors
B&M FPR