E041

TEST CONDITIONS
1. Code E012 not set;
2. Distributor Reference pulses being received;
3. RPM less than or equal to 1600.

FAILURE CONDITIONS
No cam reference pulses being received for 5 seconds.

ACTION TAKEN
ECM turns on "Engine Control System Fault" telltale.

DESCRIPTION
The cam sensor is located on the distributor shaft and provides one pulse per rotation of the distributor. The ECM uses the cam sensor signal to know the location of the camshaft for proper fuel distribution.

Code E041 sets when the ECM knows the engine is turning (reference pulses being received on CKT 430) and does not detect any cam sensor pulses.

NOTES ON FAULT TREE
1. This trouble tree requires the use of five jumper wires which can be fabricated using terminal P/N 1201483 and 12014837. When checking voltage on cam sensor circuit, a typical good voltage is between 0.5 and 3.5 volts and varying.

NOTES ON INTERMITTENTS

Manipulate affected wiring while the engine is running. if the fault is induced the code will set and the wiring should be repaired for an intermittent open or short to ground.

Disconnect and reconnect the distributor connector and ECM connector and ensure they are latched.