Toyota Yaris Can Bus Circuit
Total OBD & ECU Auto Diagnostics
NOTICE:
For vehicles without ABS, go to step 8.
(a) Measure the resistance. HINT:
The resistance must be measured after the D41 D-CAN J/C connector is disconnected.
Result
Go to step 11
|
Tester Connection |
Condition |
Specified Condition |
Proceed to |
|
D41-1 (ABS) -D41-12 (ABS) |
Ignition switch OFF |
Below 1 Q |
A |
|
D41-1 (ABS) -D41-12 (ABS) |
Ignition switch OFF |
1 Q or higher |
B |
CHECK CAN BUS LINES FOR SHORT CIRCUIT (D-CAN J/C - AIR CONDITIONING AMPLIFIER)
Wire Harness Side:
D-CAN J/C Connector isr "nor
C125896E26
NOTICE:
For vehicles without air conditioning or PTC heater, go to step 9.
(a) Measure the resistance. HINT:
The resistance must be measured after the D41 D-CAN
J/C connector is disconnected.
Result
|
Tester Connection |
Condition |
Specified Condition |
Proceed to |
|
D41-6 (A/C) - D41-17 (A/C) |
Ignition switch OFF |
Below 1 Q |
A |
|
D41-6 (A/C) - D41-17 (A/C) |
Ignition switch OFF |
1 Q or higher |
Go to step 12
CHECK CAN BUS LINES FOR SHORT CIRCUIT (D-CAN J/C - CENTER AIRBAG SENSOR ASSEMBLY)
Wire Harness Side:
D-CAN J/C Connector
C125896E27
(a) Measure the resistance. HINT:
The resistance must be measured after the D41 D-CAN J/C connector is disconnected.
Result
|
Tester Connection |
Condition |
Specified Condition |
Proceed to |
|
D41-8 (A/B) - D41-19 (A/B) |
Ignition switch OFF |
Below 1 Q |
A |
|
D41-8 (A/B) - D41-19 (A/B) |
Ignition switch OFF |
1 Q or higher |
Go to step 13
REPLACE D-CAN J/C (JUNCTION CONNECTOR)
CHECK CAN BUS LINES FOR SHORT CIRCUIT (ECM MAIN WIRE)
Wire Harness Side:
ECM Connector
Front View
(a) Disconnect the A21 ECM connector.
C125895E08
Wire Harness Side:
D-CAN J/C Connector nor' "non
(b) Measure the resistance. HINT:
The resistance must be measured after the D41 D-CAN
J/C connector is disconnected.
Result
|
Tester Connection |
Condition |
Specified Condition |
Proceed to |
|
D41-4 (EFI) - D41-15 (EFI) |
Ignition switch OFF |
1 Q or higher |
OK |
|
D41-4 (EFI) - D41-15 (EFI) |
Ignition switch OFF |
Below 1 Q |
REPLACE ECM
REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO ECM (D-CAN J/C - ECM (CAN-H, CAN-L))
CHECK CAN BUS LINES FOR SHORT CIRCUIT (BRAKE ACTUATOR (SKID CONTROL ECU) BRANCH WIRE)
|
Wire Harness Side: |
|
|
Brake Actuator (Skid Control ECU) |
|
Connector |
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Front View |
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H |
|
C118165E05 |
1or" "nor
Wire Harness Side:
D-CAN J/C Connector
(a) Disconnect the A15 brake actuator (skid control ECU) connector.
(b) Measure the resistance. HINT:
The resistance must be measured after the D41 D-CAN
J/C connector is disconnected.
Result
|
Tester Connection |
Condition |
Specified Condition |
Proceed to |
|
D41-1 (ABS) -D41-12 (ABS) |
Ignition switch OFF |
1 Q or higher |
OK |
|
D41-1 (ABS) -D41-12 (ABS) |
Ignition switch OFF |
Below 1 Q |
REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU)
REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO BRAKE ACTUATOR (D-CAN J/C -BRAKE ACTUATOR (SKID CONTROL ECU) (CAN-H, CAN-L))
CHECK CAN BUS LINES FOR SHORT CIRCUIT (AIR CONDITIONING AMPLIFIER BRANCH WIRE)
Wire Harness Side:
Air Conditioning Amplifier Connector
(a) Disconnect the E8 air conditioning amplifier connector.
ru Ln
Wire Harness Side:
D-CAN J/C Connector
C131847E04
(b) Measure the resistance. HINT:
The resistance must be measured after the D41 D-CAN J/C connector is disconnected.
Result
|
Tester Connection |
Condition |
Specified Condition |
Proceed to |
|
D41-6 (A/C) - D41-17 (A/C) |
Ignition switch OFF |
1 Q or higher |
OK |
|
D41-6 (A/C) - D41-17 (A/C) |
Ignition switch OFF |
Below 1 Q |
NG |
REPLACE AIR CONDITIONING AMPLIFIER
REPLACE AIR CONDITIONING AMPLIFIER
REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO AIR CONDITIONING AMPLIFIER (D-CAN J/C - AIR CONDITIONING AMPLIFIER (CAN-H, CAN-L))
CHECK CAN BUS LINES FOR SHORT CIRCUIT (CENTER AIRBAG SENSOR ASSEMBLY BRANCH WIRE)
Wire Harness Side:
Center Airbag Sensor Assembly Connector 
C131069E01
Wire Harness Side:
D-CAN J/C Connector ior" "nor
(a) Disconnect the D16 center airbag sensor assembly connector.
(b) Measure the resistance. HINT:
The resistance must be measured after the D41 D-CAN J/C connector is disconnected.
Result
|
Tester Gonnection |
Condition |
Specified Gondition |
Proceed to |
|
D41-B (A/B) - D41-1S (A/B) |
Ignition switch OFF |
1 Q or higher |
OK |
|
D41-B (A/B) - D41-1S (A/B) |
Ignition switch OFF |
Below 1 Q |
REPLACE CENTER AIRBAG SENSOR ASSEMBLY
REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO CENTER AIRBAG SENSOR ASSEMBLY (D-CAN J/C - CENTER AIRBAG SENSOR ASSEMBLY (CAN-H, CAN-L))
CHECK CAN BUS LINES FOR SHORT CIRCUIT (P-CAN J/C - POWER STEERING ECU)
Wire Harness Side:
P-CAN J/C Connector
1ST "TOT
(a) Measure the resistance. HINT:
The resistance must be measured after the D42 P-CAN J/C connector is disconnected. Standard resistance
|
Tester Connection |
Condition |
Specified Condition |
|
D42-4 (EPS) - D42-15 (EPS) |
Ignition switch OFF |
Go to step 17
C125896E28
CHECK CAN BUS LINES FOR SHORT CIRCUIT (P-CAN J/C - MAIN BODY ECU) 
(a) Measure the resistance. HINT:
The resistance must be measured after the D42 P-CAN J/C connector is disconnected.
Result
|
Tester Connection |
Condition |
Specified Condition |
Proceed to |
|
D42-5 (J/B) - D42-16 (J/B) |
Ignition switch OFF |
Below 1 Q |
A |
|
D42-5 (J/B) - D42-16 (J/B) |
Ignition switch OFF |
1 Q or higher |
Go to step 18
CHECK CAN BUS LINES FOR SHORT CIRCUIT (P-CAN J/C - COMBINATION METER ECU)
Wire Harness Side:
P-CAN J/C Connector isr "nor
IP"
- MET
C125896E32
(a) Measure the resistance. HINT:
The resistance must be measured after the D42 P-CAN J/C connector is disconnected.
Result
|
Tester Connection |
Condition |
Specified Condition |
Proceed to |
|
D42-7 (MET) -D42-18 (MET) |
Ignition switch OFF |
Below 1 Q |
A |
|
D42-7 (MET) -D42-18 (MET) |
Ignition switch OFF |
1 Q or higher |
Go to step 19
REPLACE P-CAN J/C (JUNCTION CONNECTOR)
CHECK CAN BUS LINES FOR SHORT CIRCUIT (POWER STEERING ECU MAIN WIRE)
|
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