E074

Sensor Wiring Diagram:

DESCRIPTION:

This diagnostic test monitors manifold air temperature for a rapid change of 7 degrees or more in temperature in a short period of time. This code can be caused by an open, short to ground or short to voltage in CKT 472 and or 469. An open or short in the sensor connector, engine to dash connector or PCM/ECM connector. A defective sensor can also cause the code. This code will never set current, since it is set by a MAT sensor value which changes faster than what can occur in a normally operating system. This code indicates an intermittent signal fault which could cause a driveability symptom.

TEST CONDITIONS:

Engine running.

FAILURE CONDITIONS:

1. Manifold air temperature change of 7° or more in 250 milliseconds.

ACTION TAKEN:

1. Code set, no SERVICE ENGINE SOON lamp.