Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 746 (CAN COMMUNICATION SYSTEM - DIAGNOSIS)CHECK CAN BUS LINEINSPECTION PROCEDURE

2004 Toyota Matrix XR, FWD, Standard

Inspection Procedure

2004 Toyota Matrix XR, FWD, StandardSECTION Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

CHECK CAN BUS LINE (MAIN BUS LINE FOR DISCONNECTION, BUS LINES FOR SHORT CIRCUIT, DLC3 SUB BUS LINE FOR DIS CONNECTION)
1. Turn the ignition switch to the LOCK position.
2. Measure the resistance according to the value(s) in Fig 2.
  
  Fig 1: Identifying Connector Terminals Of DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 2: DLC3 Tester Connection Reference Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG-A: CHECK CAN MAIN BUS LINE FOR DISCONNECTION (SEE CHECK CAN MAIN BUS LINE FOR DISCONNECTION )

NG-B: CHECK CAN BUS LINES FOR SHORT CIRCUIT (SEE CHECK CAN BUS LINES FOR SHORT CIRCUIT )

OK: Go to next step.
CHECK CAN BUS LINE (CAN-H) FOR SHORT TO +B
1. Measure the resistance according to the value(s) in Fig 4 below.
  
  Fig 3: Identifying Connector Terminals Of DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 4: DLC3 Tester Connection Reference Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: CHECK CAN BUS LINE (CAN-H) FOR SHORT TO +B (SEE CHECK CAN BUS LINE (CAN-H) FOR SHORT TO +B )

OK: Go to next step.
CHECK CAN BUS LINE (CAN-L) FOR SHORT TO +B
1. Measure the resistance according to the value(s) in Fig 6 below.
  
  Fig 5: Identifying Connector Terminals Of DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 6: DLC3 Tester Connection Reference Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: CHECK CAN BUS LINE (CAN-L) FOR SHORT TO +B (SEE CHECK CAN BUS LINE (CAN-L) FOR SHORT TO +B )

OK: Go to next step.
CHECK CAN BUS LINE (CAN-H) FOR SHORT TO GND
1. Measure the resistance according to the value(s) in Fig 8 below.
  
  Fig 7: Identifying Connector Terminals Of DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 8: DLC3 Tester Connection Reference Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: CHECK CAN BUS LINE (CAN-H) FOR SHORT TO GND (SEE CHECK CAN BUS LINE (CAN-H) FOR SHORT TO GND )

OK: Go to next step.
CHECK CAN BUS LINE (CAN-L) FOR SHORT TO GND
1. Measure the resistance according to the value(s) in Fig 10 below.
  
  Fig 9: Identifying Connector Terminals Of DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 10: DLC3 Tester Connection Reference Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: CHECK CAN BUS LINE (CAN-L) FOR SHORT TO GND (SEE CHECK CAN BUS LINE (CAN-L) FOR SHORT TO GND )

OK: HOW TO PROCEED WITH TROUBLESHOOTING (SEE HOW TO PROCEED WITH TROUBLESHOOTING )

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.