The description was specific to a bad wiring connection to the EGR. After that I got an additional code for the first time (and unfortunately I did not write it down). I pulled the ECU out and did not see any but the original label. I did not try to see if it varies with rpm yet.ĭr A suggested looking at the ECU to see if there are any labels to indicate a special tune which would keep the EGR from operating. I measured the voltage to be 3.4V on pin 1 and 12.4V at pin 2. I talked to Dr A and indeed the EGR motor does have a circuit and so a DC input could damage it. I assume it is the one under the dash on the very left side? I just have not had that connector identified yet. I think I should check continuity from the ECM now after warming it up since it may be a more consistent fault. After warming up yeaterday it threw the code at idle right when it was started. The error would come up at different times and the rpm was random anywhere from idle to 2000. I will see if it delays placing the code when I first run it. Yesterday it was giving an error sooner than before after it has warmed up. I just wonder if I should provide 12V to both pins 1 and 2. Unless it has a circuit board to translate the PWM I bet it just averages the input with the damping of the mass of the actuator and the torque of the return spring. I think even an actuator that runs on a PWM may move just a little with a momentary DC input. I get voltage on pin 1 (3.5V) and pin 2 (12V). I will have to figure out if it is getting a signal at the connector but do not have a scope. It does not cycle when shut down either just key on and off or after running. I took the cover off the EGR and attached a tie as a flag. Inspect EGR valve (Y83) and vacuum lines. P1043-128 is Exhaust gas recirculation Flow-check error. Have you tried viewing your MAF sensors readings? Key-on-Engine-off, then at idle, then cruising at constant speed? I would guess that a bad or fouled O2 sensor could also cause similar trouble. Air leaks possible.Ī bad MAF or leaks in the intake plumbing can cause P1043-128. P1403-128 is Exhaust gas recirculation Flow-check error.
If this is the case, you can pull the EGR from the manifold (leaving it connected to the harness). It may do this after a key cycle (without start)? I am not certain.
The ECM/ECU cycles the EGR twice after engine shut down to clean it. The EGR valve has internal electronics, to bench test you would need a pwm signal source in the correct frequency and voltage. The EGR valve uses a PWM signal If the EGR is working the sealing surfaces will be free of buildup, and there will be a witness mark to the movement of the plate.
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