P1640
CIRCUIT DESCRIPTIONOutput Driver Modules (ODM) are chips that are inside the Powertrain Control Module (PCM). ODMs provide grounded outputs that control devices. Each output has an internal feedback circuit that connects to the PCM microprocessor. ODM 1 determines if the voltage or the current may cause damage to the PCM. The PCM monitors voltage through the Ignition 1 input. Any incorrect current that is on a circuit to the ODM will cause the ODM to report this DTC.
CONDITIONS FOR RUNNING THE DTC
The ignition is ON.
CONDITIONS FOR SETTING THE DTC
^ The ODM has detected a voltage greater than 33 volts.
Or
^ Excessive current is detected on any circuit to the ODM.
^ Conditions present for 30 seconds.
ACTION TAKEN WHEN THE DTC SETS
^ The MIL does not turn ON.
^ A DTC is stored in memory under history DTC.
^ The Failure Records are stored.
^ The Failure Records are updated after the first failure of each ignition cycle.
^ Some type C DTCs may also cause an auxiliary service lamp to be illuminated, and/or display a message to the vehicle operator.
CONDITIONS FOR CLEARING THE MIL/DTC
^ The history DTC will clear if the fault conditions have not been detected for 40 warm-up cycles.
^ A scan tool can be used to clear DTC information.
DIAGNOSTIC AIDS
An over charging condition may set this DTC. Refer to A Diagnostic System Check - in Starting and Charging. Testing and Inspection
Thoroughly inspect any circuitry that is suspected of causing the intermittent complaint. Repair the circuits as necessary. Refer to Intermittent Conditions. Intermittent Conditions
TEST
