Diagnostic Aids
WARNING: This page is about a different car, the 2002 Saturn LW200, 2002 Saturn L200, and 2002 Saturn L100. However, it is still accessible from the selected car via links, so may be relevant.
To locate an intermittent problem, use scan tool to monitor CMP ACTIVE COUNTER while running engine. Counter should continuously count to 255, then reset to zero. Counter will stop counting if a fault occurs in cam signal circuit.
In order for DTC to set, a fault must exist on cam signal circuit (Brown/White wire) or low resistance must exist in both cylinders No. 1 and 3 secondary ignition system or high resistance must exist in both cylinders No. 4 and 2 secondary ignition system.
If an open or short to ground occurs in Brown/White wire, CALC COMPRESSION OUTPUT on scan tool will read 00000000. If a short to voltage occurs, display will read 00001111.
A missing cam pulse without a cylinder misfire may not affect engine operation.