Toyota
Nissan Versa
 Sedan Service Manual
Engine » Engine control system (EC) » Precaution
On Board Diagnostic (OBD) System of Engine and A/T or CVT

The ECM has an on board diagnostic system. It will light up the malfunction indicator lamp (MIL) to warn the driver of a malfunction causing emission deterioration.

CAUTION:

  • Be sure to turn the ignition switch OFF and disconnect the negative battery cable before any repair or inspection work. The open/short circuit of related switches, sensors, solenoid valves, etc. will cause the MIL to light up.
  • Be sure to connect and lock the connectors securely after work. A loose (unlocked) connector will cause the MIL to light up due to the open circuit. (Be sure the connector is free from water, grease, dirt, bent terminals, etc.)
  • Certain systems and components, especially those related to OBD, may use a new style slidelocking type harness connector.
  • Be sure to route and secure the harnesses properly after work. The interference of the harness with a bracket, etc. may cause the MIL to light up due to the short circuit.
  • Be sure to connect rubber tubes properly after work. A misconnected or disconnected rubber tube may cause the MIL to light up due to the malfunction of the fuel injection system, etc.
  • Be sure to erase the unnecessary malfunction information (repairs completed) from the ECM and TCM (Transmission control module) before returning the vehicle to the customer.
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    On Board Diagnostic (OBD) System of Engine and A/T or CVT

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    Nissan Versa Sedan Service Manual / Engine / Engine control system (EC) / Precaution / On Board Diagnostic (OBD) System of Engine and A/T or CVT

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