Inspection Procedure

WARNING: This page is about a different car, the 2002 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.

Check Compressor
Preparation:
1. Check compressor drive belt tension. ON-VEHICLE INSPECTION
2. Check if the compressor does not lock during operation with engine started and blower switch and A/C switch ON.
1. NG: Adjust drive belt tension or repair compressor.
2. OK: Go to next step.
Check Compressor Lock Sensor
Preparation:

Disconnect compressor connector.

Check:

Measure resistance between terminals 1 and 2 of compressor lock sensor connector.

Fig 1: Locating Compressor Lock Sensor Connector Terminals 1 & 2
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:

Resistance: 65 - 125 Ω at 20°C (68 °F) .

Reference: Inspection using oscilloscope .

Fig 2: Identifying Correct Compressor Lock In Sensor Waveform
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NOTE: The correct waveform appears as shown in the illustration on the left.

During cranking or idling, measure voltage between terminals LOCK and SG-1 of integration control and panel.
1. NG: Replace compressor.
2. OK: Go to next step.
Check Harness And Connector Between Integration Control And Panel And Compressor Lock Sensor
1. NG: Repair or replace harness or connector.
2. OK: Proceed to next circuit inspection shown on problem symptoms table. See PROBLEM SYMPTOMS TABLE . However, if DTC 22 is displayed, check and replace integration control and panel.