Inspection Procedure

1. Remove the ECM with its connectors still connected.
2. Measure the waveform of the connector.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Condition
   E8-10 (LCKI) - Body ground	Engine switch on (IG) AUTO switch ON A/C switch ON Magnetic clutch ON	Pulse generation

   ITEM CONTENT CHART
   
   

   Item	Contents
   Tool setting	200 mV / DIV., 10 ms / DIV.
   Vehicle condition	Engine switch on (IG) AUTO switch ON A/C switch ON Magnetic clutch ON

Fig 1: Identifying ECM Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Result: 

B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

C: REPLACE ECM 

A: Go to next step 

1. Disconnect the E46 A/C compressor connector.
2. Measure the resistance of the sensor.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   2 (SSR+) - 5 (SSR-)	400 Ω

Fig 2: Identifying A/C Compressor (Lock Sensor) Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE A/C COMPRESSOR (LOCK SENSOR) 

OK: Go to next step 

1. Disconnect the E46 A/C compressor connector.
2. Disconnect the E8 ECU connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Condition
   E8-10 (LCKI) - E46-2 (SSR+)	Always	Below 1 Ω
   E46-5 (SSR-) - Body ground	Always	Below 1 Ω

Fig 3: Identifying A/C Compressor And ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: REPLACE ECM