P1597

Tests 1 - 2:

Tests 3 - 8:

Tests 9 - 10:

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 shorted to ground
- S/C wiring harness observable problem
- 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
- Speed control ON/OFF switch stuck
- Speed control RESUME/ACCEL switch stuck
- PCM