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How to disable P0622 CEL

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Old Apr 1, 2015, 03:16 AM
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How to disable P0622 CEL

Hi fellow flasher

I installed an EvoECU in my 3g CSM and got it working so far with 96532706.
EGR FPR and Wastegate Selenoids are not throwing CEL anymore due to disabling the following Periphery bits
EGR: FAA bit11 ; FCA bit 14 13 and 9
FPR: FCA bit 15 ; FDA bit 11
Wastegate: FCA bit 15

Now I get the P0622 after an hour of cruising and couldn't find an answer how to disable that DTC since my alternator just doesn't have this connection.

Pin42 on ECU is free.

Would be glad if som1 had figured out and would share the knowledge.

Thanks
-vic-
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Old Apr 3, 2015, 05:45 AM
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What Signal is expected by the ecu from the alternator?
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Old Mar 24, 2017, 08:01 PM
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Originally Posted by vicore View Post
What Signal is expected by the ecu from the alternator?
My Evo8 ECU swapped gvr4 has the same code. I would be very interested in knowing what the ECU should see. Would you test the signal wire to the ECU in volts? On a running evo of course.
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Old Mar 26, 2017, 11:12 AM
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Pin 41 on the Evo 8 ECU must be connected to the FR terminal on the Alternator. The ECU sends a 5V DC signal on pin 41 to the voltage regulator inside the alternator. This causes the voltage regulator to begin controlling the generator field circuit. Once the alternator is enabled by the ECM during startup, the voltage regulator controls output independently of the ECM.

P0622 usually means that you don't have a circuit between pin 41 on the ECU and the FR terminal on the alternator. Tone it out to make sure you have continuity.

Pin 33 on the Evo 8 ECU must be connected to terminal G on the alternator. This allows the ECU to limit the generator output current by duty control of the continuity between generator terminal G and the ground.
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