Hi all,
I'm stumped what to try next. On my '87 5000S Quattro I'm getting Fault Code 2233 - Air Flow Sensor Reference voltage, or from Bentley's:
Code: Location:
2233 "Reference (supply) voltage for air sensor potentiometer and altitude sensor"Problem: "No reference voltage from Terminal 21 or ignition control unit to Terminal 26 of fuel injection control unit"
Repair: "Check wiring between electronic ignition and fuel injection control unit using wiring diagram"
I've checked this wire, as well as wires between ECU (injection control unit) and all related devices, such as air flow potentiometer, temp sensor, cold start valve, idle stablization valve; and test each device except the air flow potentiometer. I've also replaced the ECU (injection, not ignition).
Before I replace the ignition ECU and start a massive wiring check, can anybody steer me to a area that they think might be the root cause? Oh, the behavior is that it idles high, random ignition cut-out, and the cold start valve wasn't working (tho cold-start may now be working -- it started okay just now, tho before it had been requiring 30-60 sec of cranking before starting - hot or cold).
TIA, Jaz
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