2013 Toyota Tacoma
Mileage
119,067
Service Date
11/1/2024
Services Performed
- Confirm compressor engages then shuts off. Blinking A/C indicator means the A/C amplifier is not detecting compressor RPM at all or it doesn't match the engine RPM meaning a component slip. Test the speed sensor circuit at compressor with lab scope. A normal reading of 2.5V is found on the signal output when power is applied to compressor clutch (which also powers the sensor). With engine running and power applied to the clutch the sensor signal stays at a flat 2.5V. Remove the sensor from compressor body and pass a magnet in front of sensor per the OEM diagnostic chart. Signal increases to 4.5V and pulls down to .5V with N/S sides of magnet. If magnet is passed rapidly, a waveform is generated on scope. Sensor and circuit test normally per OEM diag. Seems there is a fault internally with the compressor, likely with the tone ring/signal generator. Many complaints on Identifix for aftermarket compressors having the same issue, but working again if the old sensor was put on the new compressor. This sensor tests okay, but may be worth trying before replacing the new compressor. New sensor is special order. Obtained another new compressor (aftermarket) that did not come with sensor. Installed current sensor on new compressor and bench tested at a unit. Again no signal was found. Ordered new sensor and compressor from dealer. Tried new sensor in compressor on vehicle, same 2.5V flat signal when off but new has +/-1V with compressor spinning and now stays engaged as designed. The sensor is faulty despite testing normal per OEM procedure. Seems it is not sensitive enough. Completed installation of new OEM speed sensor in the compressor that came in vehicle, system operates normally. Now with A/C working, noticed the blower only work on high speed. Needs blower resistor. Also noticed the blower has been replaced but the connector on vehicle is badly melted. Connection is getting hot to the touch. This issue will get worse and end up melting the new blower plug. Two options: Get the OEM connector and replace, or hard wire the blower eliminating the connector all together.
- BLOWER MOTOR RESISTOR – Remove & Replace
- Cut out blower motor connector and hard-wire
Sopheap C. gave our service a 5 star review on 11/6/2024
