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1997 TOYOTA 4RUNNER
3.0L V6•4WD•AUTOMATIC•gas
4 active safety recalls on this vehicle — view recalls
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Repairs0Labor1028Torque6708Fluid18DTC1806Battery2Maintenance0Recalls4
B0641moderate severityBody

A/C Refrigerant Pressure Sensor Circuit

on 1997 Toyota 4Runner 3.0L V6 · 4WD

What this code means

Malfunction in the A/C refrigerant pressure sensor circuit. The sensor monitors system pressure for compressor protection.

Symptoms

  • A/C not engaging
  • A/C blows warm air
  • A/C cycles on and off rapidly
  • Incorrect pressure reading on scan tool

Common causes

  • Faulty pressure sensor/transducer
  • Wiring damage
  • Low refrigerant level
  • Sensor connector corrosion
  • PCM input circuit fault

Diagnostic steps

  1. Read pressure sensor value with scan tool
  2. Compare electronic reading to gauge reading
  3. Test sensor voltage output
  4. Inspect sensor connector
  5. Check wiring to PCM

Repair notes

Replace refrigerant pressure sensor or repair wiring. Check refrigerant charge level.

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