Circuit Description

Output driver modules (ODMs) are used by the powertrain control module (PCM) to turn ON many of the current-driven devices that are needed to control various engine and transmission functions. Each ODM is capable of controlling up to 7 separate outputs by applying ground to the device which the PCM is commanding ON. ODMs have the capability of diagnosing each output circuit individually. DTC P1640 set indicates an improper voltage level has been detected on an ODM output.

If the PCM detects an open circuit condition and a shorted to voltage circuit condition on the same circuit at the same time, then DTC P1640 will set. DTC P1640 is a type D code.

Conditions required for setting this DTC are:

• Ignition switch on.
• Conditions occur for at least 2.5 seconds.
• The PCM detects an open circuit condition and a short to voltage circuit condition on the same circuit at the same time.