Code
P1708
DAEWOO
P — Powertrain
Accel. switch
Views:
UK: 1
EN: 4
RU: 2
AI status
Completed
Completed
100%
Causes
- Faulty accelerator switch (pedal switch or kickdown switch)
- Open or short in wiring harness between switch and ECM
- Corroded/damaged connector or poor pin contact
- Blown fuse or lost reference/ground to switch circuit
- Intermittent mechanical binding or switch sticking
- Faulty ECM (less common)
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Reduced engine power or limp-home mode in some vehicles
- Poor or delayed throttle response
- Erratic idle or unexpected engine behavior when pressing pedal
- Possible inability to shift or improper transmission behavior if switch used for kickdown
What to check
- Read freeze frame and live data with a scan tool to confirm P1708 and related codes
- Visually inspect accelerator pedal assembly, switch and wiring for damage or corrosion
- Check connector pins for corrosion, bent pins or poor seating
- Verify fuses and power/ground circuits for the switch
- Perform continuity and resistance checks on wiring between switch and ECM
- Wiggle test the pedal and harness while monitoring the DTC and live data for intermittent faults
Signal parameters
- Typical reference: 5 V supply from ECM (varies by model).
- Typical switch outputs: open/ground or approx. 0 V (off) and near reference voltage (on), or a switched ground depending on design.
- Expected behavior: clean, stable transitions when pedal is actuated; no rapid bouncing or erratic voltages.
- If the switch is PWM or analog, expect a steady, proportional signal within the factory-specified range.
Diagnostic algorithm
- Verify code: Clear codes, perform key-on/engine-off and key-on/engine-run checks, then re-scan to confirm P1708 returns.
- Visual inspection: Inspect pedal assembly, switch, connectors and wiring for physical damage, contamination, or loose pins.
- Check power/ground: With ignition on, verify the reference voltage and ground at the switch connector using a multimeter per vehicle wiring diagram.
- Signal verification: Monitor the switch signal with a meter or scope while operating the pedal. Confirm the signal changes cleanly between expected states (open/closed or voltage steps).
- Continuity/resistance: With power off, check continuity between switch output and ECM input, and check for shorts to ground or battery positive.
- Wiggle/intermittent test: Move the pedal and harness while watching live data for glitches. If intermittent, flex the wiring along its full routing.
- Isolate component: If wiring and connectors test good, bench-test or replace the accelerator switch and retest.
- Confirm repair: After repair or replacement, clear codes and perform road test to ensure code does not return and vehicle throttle behavior is normal.
- ECM check: If all circuits and the switch pass tests and the code persists, consider ECM input circuit diagnostics or replacement per manufacturer procedures.
Likely causes
- Damaged connector or wiring to accelerator switch
- Failed accelerator switch
- Corroded terminals or poor ground
- Intermittent contact due to pedal movement
Fault status
Status
Accelerator switch circuit malfunction detected. ECM has observed an abnormal or missing signal from the accelerator switch (pedal/kickdown).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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