Code 13 - Oxygen Sensor Circuit

Before diagnosing trouble according to flow chart, check to make sure that the following system and parts other than EFI system are in good condition:

• Air cleaner (clogged)
• Vacuum leaks (air inhaling)
• Spark plugs (contamination, gap)
• High-tension wires (cracks, deterioration)
• Distributor rotor or cap (wear, cracks)
• Ignition timing
• Engine compression
• Any other system and parts which might affect A/F mixture or combustion

If code No. 13 and another code are indicated together, the latter code has priority. Therefore, check and correct what is represented by that code first and then proceed to with code 13 check.

Be sure to use a voltmeter with high impedance (10,000 ohm/volt minimum) or digital volt ohmmeter for accurate measurement.

Fig 1: Code 13 Schematic, O2 Sensor Circuit

Courtesy of SUZUKI OF AMERICA CORP.

Fig 2: Code 13 Flow Chart, O2 Sensor Circuit

Courtesy of SUZUKI OF AMERICA CORP.