Test Results on ECT and EEC-IV: HELP!!

95mustanggt · 09-29-2001, 06:46 PM

Hey guys I've done a little more testing and here's what I've got:

Error codes on KOEO and continuous Mem test:

181: Adaptive Fuel rich limit reached at part throttle, right side.

189: Adaptive fuel rich limit reached, left side

543: Fuel Pump Circut Open: PCM to motor

I also tested the resistance of the ECT sensor (PCM). The resistance was 32,200 ohms when the temp gauge was at the "N" in normal (I wish I had a thermometer)

So what could all this mean? My first impression is this. There is a short between the pump and the PCM and this is causing a lean condition and detonation.

The rich condition could be caused by the coolant temp sensor causing the PCM to think that the car is cooler than it really is and cause detonation.

The only thing that is really confusing me is that I have had this detonation problem for several months and this is the first time that the fuel pump open circuit error code has come up.

I would make sense since, the detonation gets worse when the A/C is on.

Anyone have some ideas. PKRWOOD? jimberg? anyone?

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1995 Mustang GT

09-29-2001, 06:46 PM	#1
95mustanggt Registered Member Join Date: May 2000 Location: Kamloops, BC Posts: 2,875	Test Results on ECT and EEC-IV: HELP!! Hey guys I've done a little more testing and here's what I've got: Error codes on KOEO and continuous Mem test: 181: Adaptive Fuel rich limit reached at part throttle, right side. 189: Adaptive fuel rich limit reached, left side 543: Fuel Pump Circut Open: PCM to motor I also tested the resistance of the ECT sensor (PCM). The resistance was 32,200 ohms when the temp gauge was at the "N" in normal (I wish I had a thermometer) So what could all this mean? My first impression is this. There is a short between the pump and the PCM and this is causing a lean condition and detonation. The rich condition could be caused by the coolant temp sensor causing the PCM to think that the car is cooler than it really is and cause detonation. The only thing that is really confusing me is that I have had this detonation problem for several months and this is the first time that the fuel pump open circuit error code has come up. I would make sense since, the detonation gets worse when the A/C is on. Anyone have some ideas. PKRWOOD? jimberg? anyone? ------------------ 1995 Mustang GT