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Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Yaris. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • Turn the ignition switch OFF before measuring the resistances of the CAN main wire and the CAN branch wire.
  • After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.
  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If doors need to be opened in order to check connectors, open the doors and leave them open.

HINT:
Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.
  1. CHECK CAN BUS LINE FOR SHORT TO +B (DLC3 BRANCH WIRE) 
    1. Turn the ignition switch OFF.
    2. Disconnect the D41 D-CAN J/C connector.
      Fig 1: Checking CAN Bus Lines For Short Circuit (DLC3 Branch Wire)
      G04835722Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance.

      Result 

      RESULT CHART

      Tester Connection Condition Specified Condition Proceed to
      D15-6 (CANH)-D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D15-14(CANL)-D15-16(BAT) Ignition switch OFF 1 Ω or higher OK
      D15-6 (CANH)-D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      D15-14(CANL)-D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      4. Fig 2: Checking CAN Bus Wire (For Short To +B)
      G04835711Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3 (CAN-H, CAN-L) 

    OK: GO TO NEXT STEP 

  2. CONNECT CONNECTOR 
    1. Reconnect the D-CAN J/C connector.
  3. CHECK CAN BUS LINE FOR SHORT TO +B (P-CAN J/C SIDE) 
    1. Turn the ignition switch OFF.
    2. Disconnect the D42 P-CAN J/C connector.
      Fig 3: Checking CAN Bus Lines For Short Circuit (P-CAN J/C Side)
      G04835724Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance.

      Result 

      RESULT CHART

      Tester Connection Condition Specified Condition Proceed to
      D15-6 (CANH). D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D15-14 (CANL). D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D15-6 (CANH) -D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      D15-14 (CANL) -D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      4. Fig 4: Checking CAN Bus Wire (For Short To +B)
      G04835711Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to step  13

    NG: GO TO NEXT STEP 

  4. CONNECT CONNECTOR 
    1. Reconnect the P-CAN J/C connector.
  5. CHECK CAN BUS LINE FOR SHORT TO +B (D-CAN J/C - ECM) 
    1. Disconnect the D41 D-CAN J/C connector.
    2. Measure the resistance.

      Result 

      RESULT CHART

      Tester Connection Condition Specified Condition Proceed to
      D41-4(EFI)-D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D41-15(EFI)-D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D41-4(EFI)-D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      D41-15(EFI)-D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      3. Fig 5: Checking CAN Bus Line For Short To +B (D-CAN J/C - ECM)
      G04835753Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step  9

    OK: GO TO NEXT STEP 

  6. CHECK CAN BUS LINE FOR SHORT TO +B (D-CAN J/C - BRAKE ACTUATOR (SKID CONTROL ECU)) 
    NOTE: For vehicles without ABS, go to step 7.
    1. Measure the resistance.

      HINT:

      The resistance must be measured after the D41 D-CAN J/C connector is disconnected.

      Result 

      RESULT CHART

      Tester Connection Condition Specified Condition Proceed to
      D41-1 (ABS) -D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D41-12(ABS)-D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D41-1 (ABS) -D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      D41-12(ABS)-D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      2. Fig 6: Checking CAN Bus Line For Short To +B (D-CAN J/C - Brake Actuator (Skid Control ECU))
      G04835754Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step  10

    OK: GO TO NEXT STEP 

  7. CHECK CAN BUS LINE FOR SHORT TO +B (D-CAN J/C - AIR CONDITIONING AMPLIFIER) 
    NOTE: For vehicles without air conditioning or PTC heater, go to step 8.
    1. Measure the resistance.

      HINT:

      The resistance must be measured after the D41 D-CAN J/C connector is disconnected.

      Result 

      RESULT CHART

      Tester Connection Condition Specified Condition Proceed to
      D41-6(A/C)-D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D41-17(A/C)-D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D41-6(A/C)-D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      D41-17(A/C)-D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      2. Fig 7: Checking CAN Bus Line For Short To +B (D-CAN J/C - Air Conditioning Amplifier)
      G04835755Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step  11

    OK: GO TO NEXT STEP 

  8. CHECK CAN BUS LINE FOR SHORT TO +B (D-CAN J/C - CENTER AIRBAG SENSOR ASSEMBLY) 
    1. Measure the resistance.

      HINT:

      The resistance must be measured after the D41 D-CAN J/C connector is disconnected.

      Result 

      RESULT CHART

      Tester Connection Condition Specified Condition Proceed to
      D41-8(A/B)-D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D41-19 (A/B)-D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D41-8(A/B)-D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      D41-19 (A/B)-D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      2. Fig 8: Checking CAN Bus Line For Short To +B (D-CAN J/C - Center Airbag Sensor Assembly)
      G04835756Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step  12

    OK: REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (D-CAN J/C - P-CAN J/C) 

  9. CHECK CAN BUS LINE FOR SHORT TO +B (ECM MAIN WIRE) 
    1. Disconnect the A21 ECM connector.
      Fig 9: Checking CAN Bus Lines For Short Circuit (ECM Main Wire)
      G04835731Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance.

      HINT:

      The resistance must be measured after the D41 D-CAN J/C connector is disconnected.

      Result 

      RESULT CHART

      Tester Connection Condition Specified Condition Proceed to
      D41-4(EFI)-D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D41-15(EFI)-D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D41-4(EFI)-D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      D41-15(EFI)-D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      3. Fig 10: Checking CAN Bus Line For Short To +B (D-CAN J/C - ECM)
      G04835753Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE ECM 

    NG: REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO ECM (D-CAN J/C - ECM (CAN-H, CAN-L)) 

  10. CHECK CAN BUS LINE FOR SHORT TO +B (BRAKE ACTUATOR (SKID CONTROL ECU) BRANCH WIRE) 
    1. Disconnect the A15 brake actuator (skid control ECU) connector.
      Fig 11: Checking CAN Bus Lines For Short Circuit
      G04835733Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance.

      HINT:

      The resistance must be measured after the D41 D-CAN J/C connector is disconnected.

      Result 

      RESULT CHART

      Tester Connection Condition Specified Condition Proceed to
      D41-1 (ABS) - D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D41-12(ABS)- D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D41-1 (ABS) - D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      D41-12 (ABS) - D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      3. Fig 12: Checking CAN Bus Line For Short To +B (D-CAN J/C - Brake Actuator (Skid Control ECU))
      G04835754Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE BRAKE ACTUATOR (SKID CONTROL ECU) 

    NG: REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO BRAKE ACTUATOR (D-CAN J/C - BRAKE ACTUATOR (SKID CONTROL ECU) (CAN-H, CAN-L)) 

  11. CHECK CAN BUS LINE FOR SHORT TO +B (AIR CONDITIONING AMPLIFIER BRANCH WIRE) 
    1. Disconnect the E8 air conditioning amplifier connector.
      Fig 13: Checking CAN Bus Lines For Short Circuit
      G04835735Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance.

      HINT:

      The resistance must be measured after the D41 D-CAN J/C connector is disconnected.

      Result 

      RESULT CHART

      Tester Connection Condition Specified Condition Proceed to
      D41-6(A/C)-D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D41-17(A/C)-D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D41-6(A/C)-D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      D41-17(A/C)-D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      3. Fig 14: Checking CAN Bus Line For Short To +B (D-CAN J/C - Air Conditioning Amplifier)
      G04835755Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE AIR CONDITIONING AMPLIFIER 

    NG: REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO AIR CONDITIONING AMPLIFIER (D-CAN J/C - AIR CONDITIONING AMPLIFIER (CAN-H, CAN-L)) 

  12. CHECK CAN BUS LINE FOR SHORT TO +B (CENTER AIRBAG SENSOR ASSEMBLY BRANCH WIRE) 
    1. Disconnect the D16 center airbag sensor assembly connector.
      Fig 15: Checking CAN Bus Lines For Short Circuit (Center Airbag Sensor Assembly Branch Wire)
      G04835737Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance.

      HINT:

      The resistance must be measured after the D41 D-CAN J/C connector is disconnected.

      Result 

      RESULT CHART

      Tester Connection Condition Specified Condition Proceed to
      D41-8(A/B)-D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D41-19(A/B)-D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D41-8 (A/B) - D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      D41-19 (A/B) -D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      3. Fig 16: Checking CAN Bus Line For Short To +B (D-CAN J/C - Center Airbag Sensor Assembly)
      G04835756Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE CENTER AIRBAG SENSOR ASSEMBLY 

    NG: REPLACE CAN BRANCH WIRE CONNECTED TO CENTER AIRBAG SENSOR ASSEMBLY (D-CAN J/C - CENTER AIRBAG SENSOR ASSEMBLY (CAN-H, CAN-L)) 

  13. CHECK CAN BUS LINE FOR SHORT TO +B (P-CAN J/C - POWER STEERING ECU) 
    1. Measure the resistance.

      HINT:

      The resistance must be measured after the D42 P-CAN J/C connector is disconnected.

      Result 

      RESULT CHART

      Tester Connection Condition Specified Condition Proceed to
      D42-4 (EPS) -D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D42-15(EPS)-D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D42-4 (EPS) -D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      D42-15(EPS)-D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      2. Fig 17: Checking CAN Bus Line For Short To +B (P-Can J/C - Power Steering ECU)
      G04835765Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step  16

    OK: GO TO NEXT STEP 

  14. CHECK CAN BUS LINE FOR SHORT TO +B (P-CAN J/C - MAIN BODY ECU) 
    1. Measure the resistance.

      HINT:

      The resistance must be measured after the D42 P-CAN J/C connector is disconnected.

      Result 

      RESULT CHART

      Tester Connection Condition Specified Condition Proceed to
      D42-5(J/B)- D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D42-16 (J/B) - D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D42-5(J/B) - D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      D42-16 (J/B) - D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      2. Fig 18: Checking CAN Bus Line For Short To +B (P-CAN J/C - Main Body ECU)
      G04835766Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step  17

    OK: GO TO NEXT STEP 

  15. CHECK CAN BUS LINE FOR SHORT TO +B (P-CAN J/C - COMBINATION METER ECU) 
    1. Measure the resistance.

      HINT:

      The resistance must be measured after the D42 P-CAN J/C connector is disconnected.

      Result 

      RESULT CHART

      Tester Connection Condition Specified Condition Proceed to
      D42-7 (MET) - D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D42-18(MET) - D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D42-7 (MET) - D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      D42-18(MET)- D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      2. Fig 19: Checking CAN Bus Line For Short To +B (P-CAN J/C - Combination Meter ECU)
      G04835767Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step  18

    OK: REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (D-CAN J/C - P-CAN J/C (CAN-H, CAN-L)) 

  16. CHECK CAN BUS LINE FOR SHORT TO +B (POWER STEERING ECU MAIN WIRE) 
    1. Disconnect the D31 power steering ECU connector.
      Fig 20: Checking CAN Bus Lines For Short Circuit (Power Steering ECU Main Wire)
      G04835742Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance.

      HINT:

      The resistance must be measured after the D42 P-CAN J/C connector is disconnected.

      Result 

      RESULT CHART

      Tester Connection Condition Specified Condition Proceed to
      D42-4 (EPS) - D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D42-15 (EPS) - D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D42-* (EPS) - D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      D42-15(EPS) - D15-16(BAT) Ignition switch OFF Below 1 Ω NG
      3. Fig 21: Checking CAN Bus Line For Short To +B (P-Can J/C - Power Steering ECU)
      G04835765Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE POWER STEERING ECU 

    NG: REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO POWER STEERING ECU (P-CAN J/C POWER STEERING ECU (CAN-H, CAN-L)) 

  17. CHECK CAN BUS LINE FOR SHORT TO +B (MAIN BODY ECU BRANCH WIRE) 
    1. Disconnect the D33 main body ECU connector.
      Fig 22: Checking CAN Bus Lines For Short Circuit (Main Body ECU Branch Wire)
      G04835744Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance.

      HINT:

      The resistance must be measured after the D42 P-CAN J/C connector is disconnected.

      Result 

      RESULT CHART

      Tester Connection Condition Specified Condition Proceed to
      D42-5(J/B)-D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D42-16(J/B)-D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D42-5(J/B)-D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      D42-16(J/B)-D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      3. Fig 23: Checking CAN Bus Line For Short To +B (P-CAN J/C - Main Body ECU)
      G04835766Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE MAIN BODY ECU 

    NG: REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO MAIN BODY ECU (P-CAN J/C - MAIN BODY ECU (CAN-H, CAN-L)) 

  18. CHECK CAN BUS LINE FOR SHORT TO +B (COMBINATION METER ECU BRANCH WIRE) 
    1. Disconnect the D1 combination meter ECU connector.
      Fig 24: Checking CAN Bus Lines For Short Circuit (Combination Meter ECU Branch Wire)
      G04835746Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance.

      HINT:

      The resistance must be measured after the D42 P-CAN J/C connector is disconnected.

      Result 

      RESULT CHART

      Tester Connection Condition Specified Condition Proceed to
      D42-7 (MET) -D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D42-18 (MET) -D15-16 (BAT) Ignition switch OFF 1 Ω or higher OK
      D42-7 (MET) -D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      D42-18(MET)-D15-16 (BAT) Ignition switch OFF Below 1 Ω NG
      3. Fig 25: Checking CAN Bus Line For Short To +B (P-CAN J/C - Combination Meter ECU)
      G04835767Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE COMBINATION METER ECU 

    NG: REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO COMBINATION METER (P-CAN J/C - COMBINATION METER ECU (CAN-H, CAN-L)) 

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