P074

DTC P074:

Sensor Circuit:

CIRCUIT DESCRIPTION:
This diagnostic test monitors Intake Air Temperature (IAT) sensor voltage. If the PCM detects a large change in sensor output voltage in a .25 second period of time, Code P074 will set.

TEST CONDITION(S):
Two seconds have passed since Ignition Switch has been turned to the RUN position.

FAILURE CONDITION(S):
Intake Air Temperature (IAT) sensor voltage has changed 0.3 volt (11°C) in 250 milliseconds.

ACTION TAKEN:
None.

NOTES ON FAULT TREE:
1. Checking Code P074 snapshot value to determine if an intermittent high resistance or an intermittent low resistance caused the code to set. An intermittent high resistance can be caused by an open in CKT 469 or CKT 472. An intermittent low resistance can be caused by a short to ground on CKT 472.