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Generic P — Powertrain

A/C Compressor Motor Phase V Current Sensor Circuit

Brand: Generic

Type: P — Powertrain

Views: UK: 25 EN: 33 RU: 25

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Open or shorted phase V current sensor wiring (open, short to ground or battery)
Poor or corroded connector at sensor or inverter/ECM
Failed phase V current sensor (internal short or open)
Faulty inverter / motor control module
Intermittent wiring damage (chafing, water intrusion)
Faulty compressor motor windings or internal short

Record freeze frame and live data with a scan tool; note sensor value for phase V and compare with other phases
Visual inspection of harness, connectors and compressor/inverter for damage, corrosion or water
Check fuses and main power/ground to the inverter and compressor
Wiggle test wiring while monitoring live data to reveal intermittent faults
If available, use an oscilloscope to view sensor waveform and compare to other phase sensors

Sensor type: usually Hall-effect or current-sense device providing an analog voltage proportional to phase current
Typical supply/reference: 5 V or vehicle reference; sensor common referenced to inverter/ECM ground
Expected idle/zero-current voltage: approximately mid-scale (around 2.5 V) on a 5 V system (may vary by manufacturer)
Operating range: typically within ~0.1–4.9 V depending on current; out-of-range or stuck-at voltage triggers code
Waveform: DC offset with AC ripple at the motor PWM frequency; amplitude proportional to phase current

Confirm DTC and note freeze-frame data. Clear code and attempt to re-create while monitoring live data.
With ignition on, inspect connectors at the inverter/AC compressor for corrosion, bent pins, or water intrusion. Repair as needed.
Check for proper power and ground to the inverter and any sensor reference voltages (use DMM).
Backprobe the phase V current sensor signal with a voltmeter or preferably an oscilloscope. Compare voltage and waveform to other phase sensors while commanding compressor on.
If signal is absent, shorted, or constant, trace continuity of the sensor signal wire to the inverter. Repair any open or short circuits.
If wiring and connectors are good but signal remains abnormal, swap or bench-test the current sensor if serviceable or replace the inverter/motor assembly per manufacturer guidance.
After repairs, clear codes and perform functional test to verify proper compressor operation and stable sensor readings under load.
If intermittent, perform road/thermal tests and re-inspect routing for chafing and movement that could cause intermittent contact.