Toyota Sienna Service Manual: Refrigerant

Toyota Sienna Service Manual / Air conditioning / Refrigerant

On-vehicle inspection

1. INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET

(a) This method uses a manifold gauge set to locate problem areas. Read the manifold gauge pressure when these conditions are established.

Test conditions:

Temperature at the air inlet is 30 to 35°C (86 to 95°F).
Engine is running at 1,500 rpm.
All doors are fully open.
Blower speed control switch is at HI.
Temperature control switch is at MAX. COOL.
A/C switch is ON.

(b) Gauge readings (Reference)

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET

Refrigerant

(1) Normally functioning refrigeration system

Gauge reading

(2) The A/C system periodically changes between normal and improper function due to moisture in the refrigerant system.

Refrigerant

(3) The A/C system does not function effectively due to insufficient cooling.

Refrigerant

(4) The A/C system does not function effectively due to poor circulation of the refrigerant.

Refrigerant

(5) The A/C system does not function intermittently because the refrigerant does not circulate.

Refrigerant

(6) The A/C system does not function effectively due to overcharged refrigerant or insufficient cooling of the condenser.

Refrigerant

(7) The A/C system does not function due to air in the refrigeration system.

CAUTION: The low-pressure piping may be very hot and cause serious burns.

Refrigerant

(8) The A/C system does not function effectively due to an expansion valve malfunction.

Refrigerant

(9) The A/C system does not function due to a defective compressor.

Refrigerant

Gauge readings (Reference)

Refrigerant

Terminals of ecu

1. A/C AMPLIFIER HINT: Check from the rear of the connector while it is connected to the A/C amplifier. (a) Waveform 1: (b) Waveform 2: ...

Replacement

1. DISCHARGE REFRIGERANT FROM REFRIGERATION SYSTEM SST 07110-58060 (07117-58080, 07117-58090, 07117-78050, 07117-88060, 07117-88070, 07117-88080) (a) Turn the A/C switch to ON. (b) Operating t ...

Other materials:

Room temperature sensor
On-vehicle inspection 1. INSPECT A/C ROOM TEMPERATURE SENSOR (a) Remove the A/C room temperature sensor. (b) Measure the resistance according to the value(s) in the table below. Standard resistance NOTICE: Even slightly touching the sensor may change the resistance value. Be sure ...

TC and CG Terminal Circuit
DESCRIPTION DTC output mode is set by connecting terminals TC and CG of the DLC3. The DTCs are displayed by the blinking pattern of the ABS warning light. WIRING DIAGRAM HINT: When warning lights continue to blink, a ground short in the wiring of terminal TC of the DLC3 or an internal ...

On-vehicle inspection
1. INSPECT THROTTLE BODY (a) Listen to the throttle control motor operating sounds. (1) Turn the ignition switch to the ON position. (2) When pressing the accelerator pedal position sensor lever, listen to the running motor. Make sure that no friction noise comes from the motor. If fricti ...