Code
P1193
DAEWOO
P — Powertrain
ETS LIMPHOME RPM -LOW
Views:
UK: 3
EN: 8
RU: 3
AI status
Completed
Completed
100%
Causes
- Throttle actuator (drive motor) fault or failure
- Throttle body mechanical binding or excessive carbon build-up
- Throttle position sensor (TPS) or accelerator pedal position sensor (APP) fault
- Wiring harness or connector damage to throttle control, TPS, APP, or ground circuits
- Low battery voltage or poor charging system performance
- Vacuum leaks, fuel delivery problems, or severe misfire causing very low RPM
Symptoms
- Engine enters limp-home mode with reduced throttle response and limited power
- Low or unstable idle RPM, possible stalling at idle
- Malfunction Indicator Lamp (MIL) illuminated
- Throttle pedal input has little or no effect on engine speed
- Engine may run roughly, misfire, or hesitate
- Stored freeze-frame or freeze data showing low RPM when fault set
What to check
- Read and record DTC(s) and freeze-frame data with a capable scan tool
- Check battery voltage and charging system at key on and while cranking and idling
- Inspect throttle body for carbon build-up and mechanically operate throttle plate by hand (with ignition off)
- Monitor live data: commanded throttle angle, actual throttle position, accelerator pedal position, engine RPM, MAF/MAP, and fuel trims
- Inspect wiring and connectors at throttle body, TPS/APP, ECU for corrosion, damage, or poor pins
- Check for related codes (crank/cam sensors, MAF, MAP, fuel pressure) that could explain low RPM
Signal parameters
- Engine RPM (rpm) — actual vs freeze/target
- Commanded throttle angle (%)
- Actual throttle plate position / Throttle position sensor (%)
- Accelerator pedal position sensor (%)
- Throttle actuator motor current or status (if available)
- Battery voltage (V) at key on and running
Diagnostic algorithm
- Retrieve all DTCs and freeze-frame data; note conditions when P1193 set.
- Verify battery/charging system: measure voltage at rest, cranking, and idle. Replace or charge battery if low.
- With scan tool, monitor commanded vs actual throttle position and accelerator pedal inputs while attempting to reproduce. Look for no change or a stuck difference indicating actuator or sensor fault.
- Visually inspect throttle body and connectors. Remove intake elbow if needed and check for carbon build-up or mechanical obstruction. Clean throttle body if dirty and re-check.
- Check wiring and connectors for continuity, shorts to ground/power, and poor pins between throttle body and ECU. Repair any damaged wiring.
- Test TPS/APP sensors: verify changing voltage or percent values smoothly with pedal and throttle movement. Replace sensor if values are out of range or erratic.
- Test throttle actuator motor (resistance/current and operation) per factory procedure; replace throttle body assembly if actuator or internal position sensors fail.
- Check for other causes of low RPM: vacuum leaks, low fuel pressure, misfire (inspect injectors, coils, spark), and crank/cam sensor signals.
- If hardware and wiring check good, verify ECU software/firmware level and consider reflash or ECU replacement per manufacturer guidance.
- After repairs, clear codes and perform road/test under same conditions to confirm P1193 does not return.
Likely causes
- Carboned or sticking throttle plate limiting opening
- Faulty throttle actuator motor or internal position sensor
- Open/short in TPS or APP signal circuit or poor connector contact
- Low battery/charging voltage during start causing ECU to force limp mode
- Significant vacuum leak or fuel pressure problem causing idle RPM collapse
Fault status
Status
Electronic Throttle System entered limp-home mode due to detected low engine RPM — reduced power and limited throttle control.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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