The signal for the camshaft position sensor 1 (top) is intermittent or lost.
System Response:
The engine may misfire or the engine may run rough during starting. The ECM will log the diagnostic code.
There should not be a noticeable change in engine response unless the signal for the camshaft position sensor 2 (bottom) is lost. This loss will shut down the engine.
The ECM will generate a CID 320-FMI 11 diagnostic code on the Cat Data Link. The diagnostic code will be displayed on a diagnostic screen of the Electronic Technician (ET).
The ECM will generate a SPN 190-FMI 11 diagnostic code on the J1939 Data Link. The diagnostic code may be displayed on a receiving device for the J1939 data link.
The ECM will generate a 34 flash code that will be displayed on the diagnostic lamp.
Test Step 1. Perform the following test: Engine Speed/Timing Sensor Circuit - Test
Results:
- OK - Stop.