P1597

Tests 1 - 3:

Tests 4 - 8:

SYMPTOM
P1597 SPEED CONTROL SWITCH ALWAYS LOW

WHEN MONITORED
With the ignition key ON and battery voltage above 10.4 volts.

SET CONDITION
When switch voltage is less than 0.39 volts for 2 minutes.

POSSIBLE CAUSES
- Clockspring
- S/C wiring harness observable defect
- S/C switch (ON/OFF)
- S/C switch (RESUME/ACCEL)
- S/C signal circuit shorted to sensor ground
- S/C switch signal circuit shorted to ground
- PCM