DTC 13

Oxygen Sensor Circuit Diagram:

Trouble Code 13 Flow Chart:

Signal voltage doesn't change.

NOTE:
- Before diagnosing trouble according to flow chart given above, check to make sure that following system and parts other than Electronic Fuel Injection system are in good condition.
- Air cleaner (clogged)
- Vacuum leaks (air inhaling)
- Spark plugs (contamination, gap)
- High-tension cords (crack, deterioration)
- Distributor rotor or cap (wear, crack)
- Ignition timing
- Engine compression
- Any other system and parts which might affect A/F mixture or combustion.
- If code No.13 and another code No. are indicated together, the latter has priority. Therefore, check and correct what is represented by that code No. first and then proceed to the following check.
- Be sure to use a voltmeter with high impedance (M Ohm/V minimum) or digital type voltmeter for accurate measurement.