DTC 41

DTC 41 Circuit Diagram:

DTC 41 Cam Angle Sensor:

CIRCUIT DESCRIPTION:
A "Hall Effect" sensor is used for injector sequencing. The Hall Effect sends a signal (sync-pulse) to the ECM when cylinder #1 is 25° after TDC compression stroke. This signal is used to start injector sequencing. The engine will continue to run if the signal is lost, but will not restart if the engine is turned off or dies. If the failure is in the Hall Effect switch output, YEL/BLU wire, to ECM terminal "B9", code 41 will set.
Code 41 sets under the following conditions:
^ Engine cranking after failure.

TEST DESCRIPTION:
Numbers below refer to circled numbers on the diagnostic chart.

1. Checks to see if "B+" are OK at Hall Effect Switch.
2. Checks to see if the switch is sending signal at ECM.
3. Checks to see if YEL/BLU wire is shorted to ground or open. The amount of voltage is determined by the position of the vail in the sensor housing.


DIAGNOSTIC AIDS:
An intermittant may be caused by a poor connection, open in wire insulation or a broken wire.
^ Poor Connection Or Damaged Harness
Inspect ECM harness connectors for backed out terminal "B9", improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wire connection and damaged harness.
^ Intermittant Test
If connections and harness test OK, monitor a DVOM connected between ECM terminal "B9" and ground while moving related connectors and harness'. If the failure is induced, the voltage reading will change. This may help indicate the area of fault.