Code
P1118
DAEWOO
P — Powertrain
ETS MOTOR MAL
AI status
Completed
Completed
100%
Causes
- Faulty throttle actuator / ETS motor
- Open, shorted, or corroded wiring or connector to throttle motor
- Poor ground or low battery voltage
- Blown fuse or relay for throttle/ETC circuit
- Mechanical binding or contamination in throttle body (carbon buildup)
- Faulty throttle position sensor(s) or related sensors
Symptoms
- Reduced engine power / limp-home mode illuminated
- Poor or delayed throttle response, engine hesitation
- Check Engine Light (CEL) or ETS warning lamp on
- Engine may idle poorly or stall at low RPM
- Throttle plate does not move during actuator test
What to check
- Read and record DTCs and freeze-frame data with a capable scan tool
- Visual inspection of throttle body, motor, wiring harness and connectors
- Check battery voltage (engine off and cranking) and charging system
- Inspect/verify fuses and relays for ETC / throttle motor circuit
- Verify connector pins are clean, straight and fully seated
- Scan live data: target vs actual throttle angle, motor command (duty), TPS voltages
Signal parameters
- Battery voltage: nominal ~11–14.5 V (no heavy parasitic drop during tests)
- 5 V reference to position sensors: present and stable (≈5 V)
- Throttle position sensor voltage: moves smoothly across range (typical ~0.2–4.8 V depending on design)
- Actuator command: PWM duty cycle or on/off command visible in scan tool (0–100% duty cycle)
- Actuator current or feedback (if available): should be within manufacturer specification and not show short/high current
- Continuity/resistance of motor windings: check against service data (no open circuit)
Diagnostic algorithm
- Connect scan tool; record P1118 plus any additional codes and freeze-frame data.
- Check battery voltage and charging system. Low system voltage can cause actuator faults — correct any battery/charging issues first.
- Visually inspect throttle body, actuator harness and connectors for damage, corrosion, or loose pins. Repair as needed.
- Verify fuses/relays for the throttle/ETS circuit. Replace any blown fuse and retest.
- With ignition ON, use scan tool to command the throttle actuator. Observe if the throttle plate moves and monitor target vs actual throttle angle and actuator command.
- Measure supply voltage to actuator and ground at the connector. Confirm 5 V reference (for sensors) and battery feed to motor circuit. Check for intermittent voltage drops while commanding actuator.
- Check continuity and insulation to the ECM for actuator control wires. Repair any open/short.
- If available, measure motor winding resistance and compare to spec (look for open winding or short).
- Inspect and clean throttle body if mechanical sticking or carbon is present; retest.
- If wiring, connectors and throttle body/motor check good but fault remains, consider ECM/software issues — check for known TSBs and update ECU software; replace ECM only after thorough verification.
- Clear codes and perform road/test drive to confirm repair. Re-scan for reappearance.
Likely causes
- Failed throttle actuator motor (most common)
- Damaged connector pins or wiring harness (chafing, water intrusion)
- Weak battery or intermittent supply voltage to motor
- Carbon buildup preventing throttle plate movement
- Corrupted ECU software or intermittent ECU output to motor
Fault status
Status
ETS motor malfunction detected — throttle actuator / motor circuit fault. Reduced power (limp) mode possible until fault is cleared and repaired.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
Similar codes
Repair manuals
Manual library for DAEWOO
75
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