Circuit Description

Output Driver Modules (ODM) are used by PCM to turn on current-driven devices needed to control various engine and transaxle functions. Each ODM can control up to 7 outputs, including fuel pump Pulse Width Modulation (PWM) driver circuit, by supplying ground to device PCM is commanding on. ODMs can diagnose each circuit individually. If ODM "A" output 3 (fuel pump PWM driver circuit) detects an improper voltage level, P1643 is set.

Conditions required to set DTC are:

• Ignition is on.
• An improper voltage level has been detected on fuel pump PWM driver circuit.
• Listed conditions are present for more than 30 seconds.