DTC 42

Crank Angle Sensor Circuit:

Code 42 Wiring Diagram:

CIRCUIT DESCRIPTION:

The ECM supplies 12 volts to the crank angle sensor at terminal A8. As the stator inside the distributor passes the crank angle sensor the 12 volts is made less than 1.0 volt. The ECM uses this signal (at terminal A17) in determining when to fire the coil and the fuel injector. If this signal is not present during cranking, Code 42 will set. A Code 41 may also set.

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

1. B+ is supplied by the ECM to the distributor module.

2. A short to voltage in "Brown" or "Tan" wires.

3. Checking the ECM for voltage on Terminals "A8" or "A17."

4. Looking for short to ground.

5. Improper air gap could be the cause of Code 42.

DIAGNOSTIC AIDS:

An intermittent failure may be caused by a poor connection rubbed through wire insulation or a wire broken inside the insulation. Inspect ECM harness connectors for backed out terminals "A8" or "A17," improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wire connection and damaged harness.