P0182 - Fuel Temperature Sensor A Circuit Low Input
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System
Powertrain (Engine & Gearbox)
Related Fault Codes
Technical Description
P0182 is stored when the Engine Control Module (ECM) detects a voltage signal from the Fuel Temperature Sensor (FTS) 'A' that is below the calibrated limit. This typically corresponds to a voltage lower than 0.2V to 0.5V. Since most FTS sensors are NTC thermistors, a low voltage signal is interpreted as an extremely high temperature. This condition is usually caused by a short circuit to ground in the signal wire or a failure within the sensor itself. The ECM relies on this data to calculate fuel density and adjust injection timing and duration, ensuring optimal combustion and emission control.
Possible Causes
Faulty fuel temperature sensor (internal short)
Wiring harness shorted to ground on the signal circuit
Connector corrosion or shorted terminals
Faulty Engine Control Module (ECM)
Symptoms
Recommended Solution
- Visual Inspection: Check the wiring and connectors at the fuel temperature sensor for signs of damage or shorts.
- Reference Voltage Test: Disconnect the sensor and measure voltage between the reference wire and ground (ignition ON). Should be approx. 5V.
- Sensor Resistance Test: Measure the resistance across the sensor terminals. At 20°C (68°F), it should typically be 2000–3000 Ohms. If it reads near 0 Ohms, the sensor is shorted.
- Continuity Test: Check the signal wire for a short to ground using a multimeter.
- Component Replacement: Replace the fuel temperature sensor if it fails resistance tests.
Mechanic's Tip
Before replacing expensive components, always double-check wiring and connections. 80% of all sensor faults are actually due to corroded contacts or broken wires.
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