Inspection Procedure

HINT:

• If DTC C1761/61 (ECU malfunction) and/or C1774/74 (power source circuit) is displayed, perform the inspection necessary for DTC C1761/61 (See DTC C1761/61 ECU MALFUNCTION ) and/or C1774/74 (See DTC C1774/74 POWER SOURCE CIRCUIT ) first.

  (If DTC C1761/61 and C1774/74 are output at the same time, perform the inspection necessary for DTC C1774/74 first.)

• Start the inspection from step  1 when using the hand-held tester, and start from step  2 when not using the hand-held tester.

1. PERFORM ACTIVE TEST BY HAND-HELD TESTER 
   1. Connect the hand-held tester to DLC3.
   2. Turn the ignition switch ON, and push the hand-held tester main switch ON.
   3. Select the item "MOTOR RELAY" in the ACTIVE TEST, and operate it with the hand-held tester.
   4. Check the operation sound of the AIR SUS relay when operating it with the hand-held tester.
      • Standard:  The operation sound of the AIR SUS relay can be heard.
   1. OK: CHECK AND REPLACE SUSPENSION CONTROL ECU (See  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 
   2. NG: Go To Next Step 
2. INSPECT AIR SUS RELAY 
   1. Remove the AIR SUS relay from the engine room R/B No. 3.
   2. Check continuity between each terminal of the AIR SUS relay.

      Standard: 

      TESTER CONNECTION SPECIFICATION
      
      

      Tester connection	Specification
      1-2	Continuity (Reference value 62 Ω)
      3-5	No continuity

   3. Apply battery positive voltage between terminal 1 and 2.
   4. Check continuity between terminal 3 and 5 of the AIR SUS relay.

      Standard: 

      TESTER CONNECTION SPECIFICATION
      
      

      Tester connection	Specification
      3-5	Continuity

      Fig 1: Checking Continuity Between Terminal Of AIR SUS Relay

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG: REPLACE AIR SUS RELAY 
   2. OK: Go To Next Step 
3. CHECK HARNESS AND CONNECTOR (AIR SUS RELAY - SUSPENSION CONTROL ECU) 
   1. Check for open and short circuit in the harness and the connector between the AIR SUS relay and the suspension control ECU (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
   1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
   2. OK: Go To Next Step 
4. CHECK HARNESS AND CONNECTOR (AIR SUS RELAY - BODY GROUND) 
   1. Check for open and short circuit in the harness and the connector between the AIR SUS relay and the body ground (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
   1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
   2. OK: CHECK AND REPLACE SUSPENSION CONTROL ECU (See  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  )