Inspection Procedure

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

Check voltage between terminal LCKI of ECM connector and body ground.
CHECK:
1. Start the engine.
2. Push AUTO SW.
3. Measure voltage between terminal LCKI of ECM connector and body ground when A/C switch is ON.
OK:

Voltage : 10 - 14 V

Fig 1: Identifying Terminal LCKI Of ECM Connector And Body Ground
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK : Proceed to next circuit inspection shown on problem symptoms table (See PROBLEM SYMPTOMS TABLE ).
2. NG : Go to next step.
Check compressor lock sensor.
PREPARATION:
1. Jack up the vehicle.
2. Disconnect compressor lock sensor connector.
CHECK:

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

OK:

Resistance : at 20°C (68°F) : 160 - 320 Ω.

Fig 2: Identifying Compressor Lock Sensor
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG : Replace compressor lock sensor.
2. OK : Go to next step.
Check harness and connectors between ECM and compressor lock sensor (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
1. NG : Repair or replace harness or connector.
2. OK : Check multiplex communication system.