The electronic throttle control body controls the idle speed by allowing a controlled
amount of air to enter the intake manifold. Actual idle speed is continuously compared
to the ECM commanded idle speed. DTC P0507 will set if the actual idle speed is greater
than a calibrated value from the ECM commanded idle speed.
DTC PARAMETERS
DTC P0507 will set if the actual idle speed is greater than 200 rpm from the
ECM commanded idle speed when:
| • | IAT is greater than 34°C (93°F) |
| • | ECT is greater than 80°C (176°) |
| • | EVAP diagnostic not running |
| • | Vehicle speed = 0 mph ยท No ECT, EVAP, IAT, TP, or VSS DTC has been
set |
DTC P0507 diagnostic runs continuously once the above conditions have been met.
P0507 is a (type B) DTC
Diagnostic Aids
Verify the ECM's ability to control engine rpm by using ENGINE SPEED CONTROL
in the SPECIAL FUNCTIONS section of the Scan tool., which will give the user the ability
to increase or decrease rpm in increments of 25, 100, and 500 rpm. Comparing the ACUTAL
RPM with the DESIRED RPM, both should be within 100 rpm of each other.
Possible causes of high idle:
| • | Generator output low/high |
