Inspection Procedure

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

   Hybrid vehicle control ECU 

   DTC DETECTION CONDITION CHART
   
   

   Tester Display	Measurement Item / Range	Normal Condition	Diagnostic Note
   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 Switch	CANCEL switch signal / ON or OFF	ON: CANCEL switch ON OFF: CANCEL switch OFF	-
   SET/COAST Switch	SET / COAST switch signal / ON or OFF	ON: SET / COAST switch ON OFF: SET / COAST switch OFF	-
   RES/ACC Switch	RES / ACC switch signal / ON or OFF	ON: RES / ACC switch ON OFF: RES / ACC switch OFF	-

   OK: 

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

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

   STANDARD RESISTANCE REFERENCE
   
   

   Tester Connection	Switch Condition	Specified Condition
   1 - 3	RES / ACC switch hold ON	235 to 245 Ω
   1 - 3	SET/COAST switch hold ON	620 to 640 Ω
   1 - 3	CANCEL switch 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

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 cruise control switch connector.
2. Disconnect the K20 spiral cable connector.
3. Measure the resistance of the spiral cable.

   Standard resistance 

   STANDARD RESISTANCE REFERENCE
   
   

   Tester Connection	Specified Condition
   A-3 - K20-1	Below 1 Ω
   A-4 - K20-2	Below 1 Ω

Fig 2: Identifying K20 Spiral Cable Connector Terminal
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 

   STANDARD RESISTANCE REFERENCE
   
   

   Tester Connection	Specified Condition
   K20-1 (CCS) - A54-26 (CCS)	Below 1 Ω
   K20-2 (ECC) - Body ground	Below 1 Ω
   K20-1 (CCS) - Body ground	10 kΩ or higher

Fig 3: Identifying A54 ECU Connector Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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