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The Terminator
Engine/Tuning
Engine dies, code 1233
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<blockquote data-quote="rattle_snake" data-source="post: 16765142" data-attributes="member: 126699"><p>I think I found issue, FRPS</p><p></p><p>Did datalog and fuel pressure correlates to mech gauge. commanded DC adjusts as expected. I don't see anything wrong with log that indicates a problem to fix.</p><p></p><p>The fuel rail pressure spikes beat the crap out of my cheap test gauge and broke the needle off. Damn it. So I put a volt meter on raw output and placed it on dash to monitor. 0.20 v at 40 psi. hmmm.</p><p></p><p>So then built a datalog cable with voltage level shifters for SCT3 to log BAP output and FPDM output but couldn't get car to start at all. Fills garage with fuel fumes from exhaust. Pulled connecter off FRPS and tried to start, then plugged back in. FRPS now reading 2.8v and it started. Then proceeded to datalog until it died (850 seconds). after engine stopped FP read 0 psi on ODB, 0.2 v on meter, but mech gauge read 40. So I have the smoking gun, faulty FRPS. Picked up a new one from Ford today.</p><p></p><p>Note that fuel pump is not grounded in tank and has 2 wires. + one is just power supply and is constant voltage. the - side is controlled with MOSFET or some switch</p><p>and PWM to control voltage/current. So data logging low side is volt drop across FET, but can calculate pump voltage as (supply - switch voltage). Added math to log file and could see pump go to max voltage when FRPS said low pressure, but was actually high and flooded engine. hence smell of fuel while cranking also.</p><p></p><p>So I have high confidence that this will fix. else I didn't' want to test drive and get another tow.</p></blockquote><p></p>
[QUOTE="rattle_snake, post: 16765142, member: 126699"] I think I found issue, FRPS Did datalog and fuel pressure correlates to mech gauge. commanded DC adjusts as expected. I don't see anything wrong with log that indicates a problem to fix. The fuel rail pressure spikes beat the crap out of my cheap test gauge and broke the needle off. Damn it. So I put a volt meter on raw output and placed it on dash to monitor. 0.20 v at 40 psi. hmmm. So then built a datalog cable with voltage level shifters for SCT3 to log BAP output and FPDM output but couldn't get car to start at all. Fills garage with fuel fumes from exhaust. Pulled connecter off FRPS and tried to start, then plugged back in. FRPS now reading 2.8v and it started. Then proceeded to datalog until it died (850 seconds). after engine stopped FP read 0 psi on ODB, 0.2 v on meter, but mech gauge read 40. So I have the smoking gun, faulty FRPS. Picked up a new one from Ford today. Note that fuel pump is not grounded in tank and has 2 wires. + one is just power supply and is constant voltage. the - side is controlled with MOSFET or some switch and PWM to control voltage/current. So data logging low side is volt drop across FET, but can calculate pump voltage as (supply - switch voltage). Added math to log file and could see pump go to max voltage when FRPS said low pressure, but was actually high and flooded engine. hence smell of fuel while cranking also. So I have high confidence that this will fix. else I didn't' want to test drive and get another tow. [/QUOTE]
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Engine dies, code 1233
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