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Code 3-4 help


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My 2002 MR688 concrete pump is showing code 3-4. I’ve had the Mack dealer replace the sensor. It didn’t fix it so replaced the balancer pulley. Still no joy. It flashes on and off and typically stays on at full throttle. At idle it’s off.  When my foot isn’t in to it too hard it’s on sometimes and off sometimes. Any ideas? 

Edited by Nsfr1206
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