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Rb20 Diagnostic Error 21 & 54, Need Help!

r30kansai
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r30kansai Collaborator

r30kansai

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Posted

Hey people I have just finished putting a RB20 in my R30 Coupe and am in the middle of sorting out some wiring bugs.

The engine fires up and runs, everything (as far as I can tell) is wired up fine, but I was having a beer with my mechanic the other day and hooked up his diagnostic machine and I am getting the 2 error codes below.

21 - Ignition Signal Primary

54 - AT Communication Line

Error 21 - My mechanic said this might be just a slight drop in voltage on startup, or it is hooked up to the wrong relay, but I am not sure. Has anyone had a similar problem?

Error 54 - This I believe is just the signal from the auto gearbox and as I have a manual then it is understandable why it is there. But will this give me any problems, I have read on this forum and others varying accounts of running auto ECU's with a manual box, some people say they have massive problems and some say that it is fine? Is there any way to fix it?

Amec Experienced

Amec

Posted
Posted
Hey people I have just finished putting a RB20 in my R30 Coupe and am in the middle of sorting out some wiring bugs.

The engine fires up and runs, everything (as far as I can tell) is wired up fine, but I was having a beer with my mechanic the other day and hooked up his diagnostic machine and I am getting the 2 error codes below.

21 - Ignition Signal Primary

54 - AT Communication Line

Error 21 - My mechanic said this might be just a slight drop in voltage on startup, or it is hooked up to the wrong relay, but I am not sure. Has anyone had a similar problem?

Error 54 - This I believe is just the signal from the auto gearbox and as I have a manual then it is understandable why it is there. But will this give me any problems, I have read on this forum and others varying accounts of running auto ECU's with a manual box, some people say they have massive problems and some say that it is fine? Is there any way to fix it?

the code 21 is most likely to do with the ignitor module or the cam angle sensor.

check the connectors to both of those units and if necessary clean them of any corrosion. also crimp the connector plug pins in so they have good connection with the pins on the units.

failing that, one of the units themselves could be faulty. most likely the ignitor module.

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