Toyota Yaris: Air Conditioning Pressure Sensor / On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT AIR CONDITIONING PRESSURE SENSOR

(a) Check the wire harness.

(1) Disconnect the A51 air conditioner pressure sensor connector.

(2) Disconnect the H25 air conditioning amplifier assembly connector.

(3) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition A51-1 (-) - H25-15 (SG-4) Always Below 1 Ω A51-2 (PR) - H25-6 (PRE) Always Below 1 Ω A51-3 (+) - H25-11 (S5-3) Always Below 1 Ω A51-1 (-) - Body ground Always 10 kΩ or higher H25-15 (SG-4) - Body ground Always 10 kΩ or higher A51-2 (PR) - Body ground Always 10 kΩ or higher H25-6 (PRE) - Body ground Always 10 kΩ or higher A51-3 (+) - Body ground Always 10 kΩ or higher H25-11 (S5-3) - Body ground Always 10 kΩ or higher If the resistance is not as specified, repair the wire harness.

*a Component without harness connected (Air Conditioner Pressure Sensor) *b Component without harness connected (Air Conditioning Amplifier Assembly)

(4) Reconnect the H25 air conditioning amplifier assembly connector.

(5) Turn the ignition switch ON (IG).

(6) Measure the voltage according to the value(s) in the table below. Standard Voltage: Tester Connection Condition Specified Condition A51-3 (+) - Body ground IG ON 4.75 to 5.25 V If the voltage is not as specified, repair the wire harness or replace air conditioning amplifier assembly.

*a Component without harness connected (Air Conditioner Pressure Sensor)

(b) Check the air conditioner pressure sensor.

(1) Connect the connector to the A51 air conditioner pressure sensor connector.

(2) Install a manifold gauge set.

(3) Turn the A/C switch ON.

(4) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

HINT:

Check from the rear of the connector while it is connected to the air conditioning amplifier assembly.

If the voltage is not as specified, replace the air conditioner pressure sensor.