Code P1562, Cruise Vacuum 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.

Vacuum solenoid is a normally closed solenoid valve that blocks the flow of vacuum to cruise servo. When solenoid is on (energized), solenoid valve opens allowing vacuum to be drawn into servo.

Code P1562 will set when the following conditions are present.

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

When Code P1562 is set, PCM will not allow cruise control operation. P1562 does not illuminate the Malfunction Indicator Light (MIL).