Code
P1131
DAEWOO
P — Powertrain
FUEL CORR RESISTANCE MAL
AI status
Completed
Completed
100%
Causes
- Damaged, corroded or disconnected wiring/connector in the fuel correction sensor/actuator circuit
- Intermittent open or short to ground/power in harness
- Faulty fuel correction sensor or fuel control actuator (resistor, potentiometer or related component)
- Poor or corroded ground or reference supply to the sensor/actuator
- Water intrusion/corrosion at connector
- Faulty ECM or internal driver fault
Symptoms
- Malfunction Indicator Lamp (MIL/CEL) illuminated
- Rough idle, hesitation or stalling
- Reduced fuel economy
- Difficulty starting or unstable idle
- Possible loss of power or drivability issues
- Failed emissions test or high exhaust emissions
What to check
- Read and record freeze-frame and live data with an OBD-II scanner
- Confirm P1131 is current (not historic); note conditions when code set (temperature, rpm, load)
- Visual inspection of wiring and connectors for damage, corrosion, water ingress or loose pins at the sensor and ECU
- Wiggle-test wiring while monitoring live data to check for intermittent changes
- Check for related codes (fuel trim, O2 sensor, fuel pressure)
- Measure reference voltage and ground at the sensor connector
Signal parameters
- Reference voltage to sensor: ~5 V reference (verify actual with service manual)
- Signal voltage range typically within sensor specification — often 0.5–4.5 V under normal conditions (confirm exact spec in manual)
- Open circuit: infinite/OL when measuring resistance between signal and ECU expected terminals
- Short to ground: near 0 Ω between signal and chassis ground
- Short to battery/ignition: continuity to battery positive when should be isolated
Diagnostic algorithm
- Connect scan tool, record freeze-frame and live data; confirm P1131 and note operating conditions when it set.
- Perform a visual inspection of the sensor, connector and wiring harness for damage, corrosion or signs of water entry. Repair or replace damaged connectors/wiring as needed.
- With ignition ON (engine off), backprobe the sensor connector: verify 5 V reference (if applicable), signal voltage and ground presence. Compare to manufacturer specification.
- Measure resistance/continuity between sensor signal terminal and ECM connector pin with harness disconnected. Look for opens, intermittent resistance or shorts to ground/power.
- If harness checks good, bench-test or substitute the suspect fuel correction sensor/actuator with a known-good unit (or measure its resistance against specification).
- Repair any wiring faults, replace the sensor if out of spec, and secure/replace corroded connectors. Clean and secure engine/ECM grounds and fuses if weak.
- Clear codes and road-test under the same conditions to confirm the code does not return. If code returns after repairs, consider ECU diagnosis or replacement.
- If unable to find a fault in wiring or sensor, consult vehicle-specific service manual for ECU bench tests and consider ECU replacement as a last resort.
Likely causes
- Broken or pinched wire between sensor and ECM
- Corroded connector pins at the sensor or ECU
- Sensor element failed (resistive element out of specification)
- Short to battery or ground at the sensor harness
- Poor ECU ground or power supply issue
Fault status
Status
ECM detected abnormal resistance in the fuel correction circuit (open, short or out-of-spec resistance). This may cause incorrect fuel trim and drivability issues; a stored fault and MIL illumination result.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Manual library for DAEWOO
75
Browse 75 DAEWOO manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
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