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Cat Man
Cat Man, Cat Engine Expert
Category: Industrial Equipment
Satisfied Customers: 8958
Experience:  I am ASE Master Certified.
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Caterpillar 3512B engine Gave problems with the secondary

Customer Question

JA: Hello. What seems to be the problem?
Customer: Caterpillar 3512B engine Gave problems with the secondary ECM and secondary speed sensor. Replaced both. Now still having the same problems. Alarm codes 033 and 342.03
JA: Sometimes things that you think will be really complicated end up being easy to fix. The Heavy Equipment Mechanic I'm going to connect you with knows all the tricks and shortcuts.
Customer: that would be great
JA: Are you fixing this yourself? What have you tried so far?
Customer: ive had a caterpillar tech out who replaced the ECM and secondary speed sensor, but now ive got the same problems
JA: Anything else you want the equipment mechanic to know before I connect you?
Customer: that's about it
Submitted: 1 year ago.
Category: Industrial Equipment
Expert:  Cat Man replied 1 year ago.
Thanks for asking your question. I will try and help you out.
There are three things that can cause this code.
A faulty sensor
A faulty harness
A faulty ECM.Since you have already replaced the sensor and ECM. I must suspect a problem with the harness.Please reply back if you need more help or have more questions. I am happy to assist.