Caterpillar GP20CN error code E21 - Maintenance & Troubleshooting discussion in Forkliftaction's forums

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Caterpillar GP20CN error code E21

Hello!
Can someone help me with error code E21 on Caterpillar GP20CN,... the serial N is ET34-60029 if needed. I need to know what it means.
Thank you in advance!

Posted 8 Feb 2013 00:47
By mhonotone
joined 8 Feb'13 - 11 messages
Sofia, Bulgaria

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in other words check the wires at the plug going into the harness connector at the air flow sensor, you might find one of them broken. Giving a tug on the wires will tell the story, if one pulls out then you have your open circuit. A bit of solder can repair this easily :o)

Posted 11 Feb 2013 21:07
By swoop223
joined 23 Mar'12 - 3,691 messages
North Carolina, United States

You've been swooped!
swoop223@gmail.com

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Thank you! (bow)

Posted 11 Feb 2013 17:13
By mhonotone
joined 8 Feb'13 - 11 messages
Sofia, Bulgaria

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E-21 Air flow meter fault
1. When air flow meter output current of 0.5V
or less (break or short) continues for a length
of time while engine is running.
2. When air flow meter output current of 4.9V
or more (break or short) continues for a
length of time with the engine stopped (key
SW in ON position)
Hope this helps you

Posted 8 Feb 2013 06:14
By powerlifter
joined 17 Mar'09 - 306 messages
united kingdom, United Kingdom

A good engineer is a helpful engineer

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