Thundermax Oxygen (O2) Sensor Operation Testing User Manual download pdf

O2 Sensor Testing

If your engine has unexpectedly started to run poorly, an O2 Sensor Test should be

performed.

IMPORTANT: Testing the O2 sensors using the procedures below REQUIRES that the engine will idle normally and

with reasonable stability. This must be achieved by loading the original base map or a known good base map and

clearing ALL learned conditions.

After reloading the base map and clearing all learned conditions, if the engine does not idle reasonably well,

the probability is VERY HIGH that there is a mechanical or electrical issue on the motorcycle causing the problem.

Refer to: Trouble Shooting Basics if engine will not idle properly

How to Trouble Shoot Basic Problems

Diagnosing a problem in the O2 sensor system

1. Load the original “un-modified” base map to the module.

2. Clear “Learned Fuel Adjustments”

3. Clear “Learned Idle Adjustments”

4. Perform module initialization of Key ON 20 sec, Key OFF 20 sec….repeat 5 times.

5. Start engine and let idle to operating temperature.

AFR readings while the engine is idling normal and stable

AFR value is constantly 19.36 on “one cylinder only”. Other cylinder AFR reads normal.

 O2 sensor is faulty.

 Wire harness is damaged.

AFR value is constantly 19.36 on “both cylinders”.

 O2 module is faulty.

1 2 3 4 5 6

O2 Sensor Testing If your engine has unexpectedly started to run poorly, an O2 Sensor Test should be performed. IMPORTANT: Testing the O2 sensors us

Page 2

AFR value is constantly 22.05 on “both cylinders”.  O2 sensors NOT plugged in.  O2 module not connected to DATA PLUG properly.  O2 module DATA

Page 3

Verify your O2 Module Connection. Make sure you have the plug completely seated and screwed in tightly. NOTE: Screws should be slightly ‘counter

Page 4

Determine which is bad, O2 Sensor or O2 Harness A basic “Swap and Test” procedure can be used to isolate “which” component is faulty, the O2 Sensor

Page 5

Initialization Test of O2 Sensors Throttle by Cable, SmartLink Software 1. Connect computer interface cable to the module. 2. Turn ignition switc

If you are getting a constant AFR reading of 9.30 on both cylinders, the ECM is not getting a signal from the Data Port on the O2 Module. How to C

No comments

Thundermax Oxygen (O2) Sensor Operation Testing User Manual