3.
Has a problem been found?
 | ▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure. |
 | ▶ Go to "CAN Signal Circuit Inspection" procedure. |
Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
| ▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure. |
| ▶ Go to "CAN Signal Circuit Inspection" procedure. |
Ignition "OFF" & Engine "OFF".
Disconnect ECM/TCM/4WD connector and HECU connector.
Measure resistance between CAN-High terminal of ECM/TCM/4WD harness connector and CAN-High terminal of HECU harness connector.
Measure resistance between CAN-Low terminal of ECM/TCM/4WD harness connector and CAN-Low terminal of HECU harness connector.
Specification : Approx. below 1Ω
Is the measured resistance within specifications?
| ▶ Go to "Check CAN communication line for short" procedure. |
| ▶ Repair open in the CAN communication line between ECM/TCM/4WD ECU and HECU, Go to "Verification of Vehicle Repair" procedure. |
Ignition "OFF" & Engine "OFF".
Disconnect ECM/TCM/4WD connector and HECU connector.
Measure resistance between CAN-High terminal of ECM/TCM/4WD harness connector and chassis ground.
Measure resistance between CAN-Low terminal of ECM/TCM/4WD harness connector and chassis ground.
Measure resistance between CAN-High terminal and CAN-Low of ECM/TCM/4WD harness connector.
Specification : Infinite (∞ Ω)
Is the measured resistance within specifications?
| ▶ Go to "Component Inspection" procedure. |
| ▶ Repair short in the CAN communication line between ECM/TCM/4WD ECU and HECU, Go to "Verification of Vehicle Repair" procedure. |
