Diagnosis system

When troubleshooting Europe On-Board Diagnostic (Euro-OBD) vehicles, the vehicle must be connected to an OBD scan tool (complying with ISO 15765-4). Various data output from the vehicle's ECM can then be read. Euro-OBD regulations require that the vehicle's on-board computer illuminate the Malfunction Indicator Lamp (MIL) on the instrument panel when the computer detects a malfunction in:

Terminals of ecm

HINT: Each ECM terminal's standard voltage is shown in the table below. In the table, first follow the information in "Condition". Look at "Symbols (Terminal No.)" for the terminals to be inspected. The standard voltage between the terminals is shown in "Specified Condition". Use the illustration above as a reference for the ECM terminals.

Problem symptoms table

Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in order of probability in the "Suspected area" column of the table. Check each symptoms by checking the suspected areas in the order they are listed. Replace parts as necessary.