Code
P0182
ISUZU
P — Powertrain
Fuel Temperature Sensor Circuit Low
AI status
Completed
Completed
100%
Causes
- Damaged or shorted signal wire (short to ground)
- Open or corroded connector or pins at the sensor
- Failed fuel temperature sensor (thermistor shorted internally)
- Poor or missing sensor ground or reference
- Water or contamination in connector or sensor
- ECM/input circuit fault (rare)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Incorrect fuel temperature reading in live data (extremely low or stuck)
- Hard start or cold-start enrichment problems
- Reduced fuel economy or drivability issues under some conditions
- Possible hesitation or rough idle
What to check
- Read freeze-frame and live data for fuel temperature and related sensors
- Visual inspection of sensor, connector and harness for damage or corrosion
- Back-probe sensor connector and observe signal voltage while key on/engine running
- Measure sensor resistance at ambient temperature and compare to specification
- Check for continuity to ground and for short to ground on the signal wire
- Verify proper reference voltage or pull-up at ECU if applicable
Signal parameters
- Sensor type: typically NTC thermistor (resistance decreases as temperature rises)
- Typical signal voltage span: about 0.1–5.0 V (varies by manufacturer; low code means near 0 V)
- Typical resistance examples (approximate): ~1 kΩ–10 kΩ across operating range (consult vehicle spec sheet for exact values)
- Expected behaviour: gradual voltage change with temperature; not a hard 0 V or open-circuit
- Low-circuit indicated by signal ~0 V or resistance far below expected for ambient temp (short to ground)
Diagnostic algorithm
- Retrieve codes and live data with a scan tool. Note fuel temperature reading and any related codes (fuel pressure, intake air temp).
- Visually inspect the fuel temperature sensor, its wiring harness and connector for damage, corrosion, melted insulation or evidence of fuel/water ingress.
- With key ON (engine off) back-probe the sensor connector: measure signal voltage to ground. Compare to expected reference from service literature. A signal near 0 V indicates a low/short condition.
- Measure sensor resistance at ambient temperature (remove sensor if needed). Compare resistance to manufacturer spec or expected thermistor curve. Very low resistance suggests internal short.
- Check continuity of the signal wire to the ECM pin and check for short to ground. Wiggle harness while observing signal/continuity to reproduce intermittent faults.
- Verify sensor ground and any reference/pull-up circuit from the ECM. Check for open or high-resistance ground connection.
- If wiring and connector are good but readings are out of spec, replace the fuel temperature sensor and retest.
- If problem persists after sensor replacement, check ECM input circuit for shorts or failures — consult wiring diagrams and consider ECU bench test or replacement as last resort.
- Clear codes, perform road/drive cycle and recheck for code reappearance and proper fuel temperature readings.
Likely causes
- Corroded or loose connector at the fuel temperature sensor
- Shorted signal wire to ground
- Failed fuel temperature sensor
Fault status
Status
P0182 — Fuel Temperature Sensor Circuit Low: The ECM detected an abnormally low signal from the fuel temperature sensor circuit (possible short to ground, failed sensor, poor connector/ground).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Repair manuals
Manual library for ISUZU
86
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