p1689
im working on a truck for my brother it is a 99 cummins auto 4x4
it comes up with code 1689 truck is all stock with 275 on it we swapped the ecm with one off a running truck and a tps of a running truck didnt make no difference, truck only revs up to 1200 rpms but does start and run is there anything else that causes this code or is it the vp44?? thanks for any help also all connections look good and harnes looks in good shape but i did not take it apart yet |
P1689 No Comm between ECM & Inj Pump Mod
Its more than likely the VP. The only code that points to a bad ecm is 0606. |
there is no other possibilities???
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dam i have same code... sad day
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Check the relay under the hood "Fuel pump Relay" Drivers side
When this relay is missing or broken the VP44 doesn't energize nor pump fuel. It allows you to do the cranking test. But it also sets a P1689 and CEL light. So for all of you that have a P1689 error code present check your fuel pump relay first by trading with another relay! Do the above first before a VP44 replacement with a lift pump replacement. |
so does this relay run the vp or fuel pump?
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Originally Posted by wes-cummins
(Post 664452)
there is no other possibilities???
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fuel pump relay is good, how do the shops test the vp44?
---AutoMerged DoublePost---
Originally Posted by alwazjeepin98
(Post 665575)
so does this relay run the vp or fuel pump?
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