B1-S1 (Oxygen Sensor Signal), Mode 5
B1-S1 (OXYGEN SENSOR SIGNAL), MODE 5
NOTE: When a Heated Oxygen Sensor (HO2S) malfunction is stored, use mode 5 to check HO2S signal output, to check whether the HO2S before three way catalytic converter is within specification, or whether another malfunction is present, e.g. HO2S 2 (after three way catalytic converter) is causing an O2S control malfunction.
The points 01 to 09 represent:
01 - Rich/lean threshold voltage (constant value)
02 - Lean/rich threshold voltage (constant value)
03 - Lower voltage for calculating switching period
04 - Upper voltage for calculating switching period
05 - Calculated rich/lean switching time
06 - Calculated lean/rich switching time
07 - Minimum test voltage
08 - Maximum test voltage
09 - Time between threshold voltages
- Press the -5- button to select "B1-S1" mode 5.
Indicated on display: Test ID 01
Mode 45 Test ID 1 Module 10 ->
B1-S1 0.445V
Rich/lean threshold voltage: Constant value 0.445 volts
- Press -> button.
Indicated on display: Test ID 02
Mode 45 Test ID 2 Module 10 ->
B1-S1 0.445V
- Lean/rich threshold voltage: constant value 0.445 volts
- If constant value is not obtained, the HO2S is faulty
- Press -> button.
For the following HO2S signals, three values are always displayed:
1st value = Minimum value
2nd value = Actual value
3rd value = Maximum value
NOTE: The displayed Min. and Max. values are constant and do not change. The actual value is displayed as a constant. It will only change when during the test the HO2S supplies a greater or smaller signal.
Indicated on display: Test ID 07
Mode 45 Test ID 7 Module 10 ->
B1-S1 0.148V x.xxV 0.40V
- Minimum test voltage
- If the actual value is below 0.148 volts, there is a short circuit to Ground.
- When the actual value exceeds 0.4 volts, the malfunction could be: HO2S is not at working temperature, O2S heating is faulty, wiring open circuit to HO2S or a short circuit to positive (B+).
- Press -> button.
Indicated on display: Test ID 08
Mode 45 Test ID 8 Module 10 ->
B1-S1 0.598V x.xxV 1.078V
- Maximum test voltage
- If the actual value is above 1.078 volts, there is a short circuit to positive in wiring to HO2S
- If the actual value is below 0.598 volts, the malfunction could be: an HO2S not reaching proper operating temperature, faulty O2S heating or an open circuit in HO2S wiring.
- Press -> button.
Indicated on display: Test ID 09
Mode45 Test ID 9 Module 10 ->
B1-S1 0.04s x.xxs 1.20s
- The display shows the time between the threshold voltages
- If the actual value is below the minimum time of 0.04 seconds, there is a short circuit
- If the actual value exceeds the maximum time of 1.20 seconds, the malfunction could be due to an aged, lazy or contaminated oxygen sensor.
- Press -C- button to exit the program sequence.