Cylinder Side Upstream Heated Oxygen Sensor/Other Side Upstream Heated Oxygen Sensor - Mazda B-Series 1997 Workshop Manual

FT
ON-BOARD DIAGNOSIS SYSTEM
Diagnostic trouble code
No. PO1 33, PO1 53,P0131, PO1 51
Symptom
P0131lP0133: # I CYLINDER SIDE UPSTREAM HEATED OXYGEN SENSOR
PO1 51lP0153: OTHER SlDE UPSTREAM HEATED OXYGEN SENSOR
H 0 2 S generates a negative voltage.
Response rate of H 0 2 S is below calibrated window.
STEP
1
2
3
INSPECTION
ACTION
'
- Vacuum lines disconnected.
!
: - Improperly seated dipstick and tube.
1
NO GO to next step.
- Exhaust leaks at flange and gaskets.
Are there any air leaks?
I
I
For P0131/0151:
Yes
I
Complete PCM reset to clear DTCs.
Key OFF. Complete a H02S monitor drive cycle.
Connect scan tool or NGS to data link connector.
1
Repeat test step 1. If test result is greater than 0.6
Key ON, engine off.
volt, testing is complete.
Access Generic OBD II functions and trigger.
Scroll Oxygen Sensor Test and trigger.
I
~
Scroll to Manufacturer Specific Test ID and trigger.
No Go to next step.
-
Scroll to Test ID:(41 H) and trigger.
Is measurement for H02S fault greater than 0.6 volt?
Investigate the following items as a potential source of H02S
contamination:
- Use of unapproved silicon sealers.
Yes Repair source of contamination.
Replace H02S and oillfilter.
Complete PCM reset to clear DTCs and H02S
4
5
- Fuel contaminated by silicon additives.
I
monitor drive cycle.
- Excessive oil burning.
- Glycol leaking internally in engine.
!
- Lead contaminated fuel.
1
/
No Go to next step.
- Use of unapproved cleaning agents.
Are any of the above conditions present?
I
Fuel calculations can be affected by unmetered air leaks:
Yes
~
Repair source of air leak.
- Hoses connecting mass airflow meter.
Complete PCM reset to clear DTCs and H02S
- Hoses connecting to throttle body.
1
monitor drive cycle.
-
Intake manifold gasket leaks.
1
1
!
- PCV disconnected.
Key OFF. Yes
/
Replace H02S and oillfilter.
Disconnect suspect H02S connector. '
Complete PCM reset to clear DTCs and H02S
Jumper H02S SIG to VPWR at H02S connector.
1
monitor drive cycle.
Connect scan tool or NGS to data link connector.
I I
Key ON, engine off. I
Access correct H02S PID or 0 2 s on scan tool.
No Go to next step.
Is voltage greater than 1.50 volts?
Key OFF.
Install breakout box, leave PCM disconnected.
Measure resistance between H02S SIG test pin at breakout
box and H02S connector.
- H02S SIG test pin: 60 for H02S-11/87 for H02S-21
Measure resistance between SIG RTN test pin at breakout
box and H02S connector.
I
Is resistance less than 5.0 ohms?
1
I
Yes Go to next step.
,
i
No
i
Repair open circuit. Complete H02S monitor drive
I
cycle.
1
- H02S SIG RTN test pin: 91 for H02S-11 and H02S-21
I
I
I
Yes
1
Replace PCM. Complete H02S monitor drive cycle. 6
'
Key OFF.
Leave PCM disconnected.
7
8
Measure resistance between H02S SIG and VPWR test pins
1
at breakout box and H02S SIG and SIG RTN test pins at
_
j
--
breakout box.
- H02S SIG test pin: 60 for H02S-11/87 for H02S-21
No
/
Repair short circuit.
- VPWR test pin: 71/97 for H02S-11 and H02S-21
1
Complete H02S monitor cycle.
- H02S SIG RTN test pin: 91 for H02S-11 and H02S-21
For PO1 33/01 53:
Is there water in H02S connector?
Measure resistance between appropriate test pins at breakout
(
box and H02S SIG and SIG RTN at H02S connector.
- H02S SIG test pin: 60 for H02S-11/87 for H02S-21
- H02S SIG RTN test pin: 91 for H02S-11 and H02S-21
Yes Repair source of water entry. Dry out connector.
Replace H02S. Go to step
9.
1
No Go to next step.
I
Repair wiring as necessary.
Go to step 9.
Key OFF.
Disconnect suspect H02S sensor connector.
1
Install breakout box, leave PCM disconnected.
9
Yes
( Replace H02S.
Go to step 9.
Is resistance less than 5.0 ohms?
Perform After Repair Procedure to ensure customer's concern has been resolved.
6BUOFT-061
FT-90