"Engine Fault" dash indication; no other codes. SOLVED
#1
"Engine Fault" dash indication; no other codes. SOLVED
I have an "Engine Fault" warning script reading on the dash panel; but no amber check engine light.
My OBD code reader comes up "System Pass" showing no codes. Pending codes reads P1000 which I do not understand the meaning.
I runs fine for about 50 miles now, EXCEPT once it went into "Gearbox Fault" on the dash script; went into limp home mode.... the third gear kind. Stopped, waited a few minutes and then good to go. There is now no Gearbox Fault script, but the Engine Fault script continues to appear. Only went into "limp home mode" this one time [hopefully].
We have replaced the Throttle Body with a known good Throttle Body and no change. Still shows an Engine Fault script after about 3 miles down the road.
I can feel no loss of power or engine missing. Runs strong right up to 4k w/o any obvious problems (except the one-time Limp Home Mode episode.)
Ideas?
My OBD code reader comes up "System Pass" showing no codes. Pending codes reads P1000 which I do not understand the meaning.
I runs fine for about 50 miles now, EXCEPT once it went into "Gearbox Fault" on the dash script; went into limp home mode.... the third gear kind. Stopped, waited a few minutes and then good to go. There is now no Gearbox Fault script, but the Engine Fault script continues to appear. Only went into "limp home mode" this one time [hopefully].
We have replaced the Throttle Body with a known good Throttle Body and no change. Still shows an Engine Fault script after about 3 miles down the road.
I can feel no loss of power or engine missing. Runs strong right up to 4k w/o any obvious problems (except the one-time Limp Home Mode episode.)
Ideas?
Last edited by H20boy; 10-20-2011 at 08:03 PM.
#2
Well, I do know that when there is a transmission issue, the CEL can come on. First let me ask, does the CEL light work? Does it show on key ignition?
As for the P1000, if you haven't cleared the codes on it in awhile, the P1000 "system readiness test not completed' should have changed to the normal P1111. That is odd. I would try another OBDII reader, just to be sure communications are well between the two.
Have you had any other transmission issues or repairs/maintenance?
As for the P1000, if you haven't cleared the codes on it in awhile, the P1000 "system readiness test not completed' should have changed to the normal P1111. That is odd. I would try another OBDII reader, just to be sure communications are well between the two.
Have you had any other transmission issues or repairs/maintenance?
#6
#7
Follow up on Problem Solved.... we hope
So far replacing the Brake Pedal Switch has cured the Engine Fault dash script.
Problem: The dash screen was showing an "ENGINE FAULT" script; but there was NO "Check Engine" light. This occurred only when the Cruise Control button was activated. The cruise control was inoperable under these conditions.
Diagnostic: Turn off the Cruise Control button on consul. This should eliminate warning script on next start up.
Solution: Replace the Brake Pedal Switch
Logic: Apparently, the second set of the four (4) brake pedal switch contacts goes to the Cruise Control [via the ECU]. This is to deactivate CC when the brakes are applied. When this functionality is not working, because of a faulty brake pedal switch, the ECU deactivates the CC. Why the ECU presents this as an Engine Fault warning is beyond me, but that is the symptom presented.
Problem: The dash screen was showing an "ENGINE FAULT" script; but there was NO "Check Engine" light. This occurred only when the Cruise Control button was activated. The cruise control was inoperable under these conditions.
Diagnostic: Turn off the Cruise Control button on consul. This should eliminate warning script on next start up.
Solution: Replace the Brake Pedal Switch
Logic: Apparently, the second set of the four (4) brake pedal switch contacts goes to the Cruise Control [via the ECU]. This is to deactivate CC when the brakes are applied. When this functionality is not working, because of a faulty brake pedal switch, the ECU deactivates the CC. Why the ECU presents this as an Engine Fault warning is beyond me, but that is the symptom presented.
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