Inspection Procedure

1. Check the DATA LIST for proper functioning of the cruise control main switch.

   Hybrid vehicle control ECU 

   ITEM MEASUREMENT CONDITIONS
   
   

   Item	Measurement Item / Display (Range)	Normal Condition
   CCS MAIN SW M-CPU	Main switch signal (Main CPU) / ON or OFF	ON: Main switch ON (Pushed on) OFF: Main switch OFF (Pushed off)
   CANCEL SW	CANCEL switch signal / ON or OFF	ON: CANCEL switch ON OFF: CANCEL switch OFF
   SET/COAST SW	SET/COAST switch signal / ON or OFF	ON: SET / COAST switch ON OFF: SET / COAST switch OFF
   RES/ACC SW	RES/ACC switch signal / ON or OFF	ON: RES / ACC switch ON OFF: RES/ACC switch OFF

   OK: 

   When cruise control main switch operation is performed, the results will be same as above. 

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

NG: GO TO Next Step 

1. Disconnect the cruise control main switch connector.
2. Measure the resistance of the switch.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Switch Condition	Specified Condition
   1 - 3	RES/ACC switch is hold ON	235 to 245 Ω
   1 - 3	SET/COAST switch Is hold ON	620 to 640 Ω
   1 - 3	CANCEL switch is hold ON	1,510 to 1,570 Ω
   1 - 3	Cruise control main switch OFF	10 kΩ or higher
   1 - 3	Cruise control main switch ON	Below 1 Ω
   1 - 2	MODE switch is hold ON	Below 1 Ω

   Fig 1: Inspecting Cruise Control Main Switch

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE CRUISE CONTROL MAIN SWITCH 

OK: GO TO Next Step 

1. Disconnect the A and K20 spiral cable connectors.
2. Measure the resistance of the spiral cable.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Condition	Specified Condition
   A-3 - K20-1 (CCS)	Below 1 Ω
   A-3 - K20-7 (RIB)	Below 1 Ω
   A-1 - K20-2 (ECC)	Below 1 Ω

   Fig 2: Identifying A And K20 Spiral Cable Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE SPIRAL CABLE SUB-ASSEMBLY 

OK: GO TO Next Step 

1. Disconnect the K20 spiral cable connector.
2. Disconnect the A54 ECU connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   K20-1 (CCS) - A54-32 (CCHG)	Below 1 Ω
   K20-7 (R/B) - A54-26 (CCS)	Below 1 Ω
   K20-2 (ECC) - Body ground	Below 1 Ω
   K20-1 (CCS) - Body ground	10 kΩ or higher
   K20-7 (R/B) - Body ground	10 kΩ or higher

   Fig 3: Identifying K20 Spiral Cable And A54 ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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