Code P1561, Cruise Vent Solenoid: Notes

Cruise switch within turn signal lever receives ignition voltage from a 15-amp fuse to turn signal lever cruise switches. Cruise ON/OFF, SET/COAST and RESUME/ACCEL switches are inputs to cruise portion of PCM.

Cruise servo vent and vacuum solenoids output are controlled by high side drivers in PCM. When ignition is on, PCM looks at these output lines and will set codes if an incorrect status is seen on any line.

Vent solenoid is a normally open (de-energized) solenoid valve that allows vacuum in cruise servo to be depleted. When solenoid is on (energized), cruise servo holds vacuum allowing servo to remain retracted and hold throttle open.

Code P1561 will set when the following conditions are present.

• Vent driver circuit is shorted to voltage when vent solenoid is commanded off.
• Vent driver circuit is open.
• Vent driver circuits shorted to ground when vent solenoid is commanded on.
• One of above conditions are met for more than half of a second.

When Code P1561 is set, PCM will not allow cruise control operation. P1561 does not illuminate the Malfunction Indicator Light (MIL).