Circuit Description
The engine control module (ECM) has the ability to set a diagnostic trouble
code (DTC) and store failure record information when the cruise control ON/OFF switch
is cycled three times within a 5 second period. The intended purpose of this
DTC is to allow the customer to capture failure record information during a driveability
condition that may be difficult to duplicate during a test drive. The technician
can use this information to attempt to simulate the engine operating conditions the
vehicle was under at the time the driveability condition occurred. This feature is
on cruise control vehicles only.
Conditions for Running the DTC
The cruise control is ON.
Conditions for Setting the DTC
This DTC will set if the cruise control ON/OFF switch is cycled three times
within a 5 second period when the ignition is on.
Action Taken When the DTC Sets
| • | The control module stores the DTC information into memory when
the diagnostic runs and fails. |
| • | The malfunction indicator lamp (MIL) will not illuminate. |
| • | The control module records the operating conditions at the time
the diagnostic fails. The control module stores this information in the Failure
Records. |
| • | The driver information center, if equipped, may display a message. |
Conditions for Clearing the DTC
| • | A current DTC Last Test Failed clears when the diagnostic runs
and passes. |
| • | A history DTC clears after 40 consecutive warm-up cycles,
if no failures are reported by this or any other non-emission related diagnostic. |
| • | Clear the DTC with a scan tool. |
Diagnostic Aids
This DTC is used to store a snapshot of data which can be read on a scan tool
under DTC P1624 Failure Record. This information may be used to duplicate a customer's
concern.
