Mazda B-Series 1997 Workshop Manual page 442

ON-BOARD DIAGNOSIS SYSTEM
FT
INSPECTION
- -
P R e p l a c e H02S.
Leave suspect H02S disconnected.
Go to step 25.
Key ON, engine off.
---+
Access H02S PID or 0 2 s on scan to01 corresponding to
N~
,
Re~lace PCM.
Perform After Repair Procedure to ensure customer's concern has been resolved.
1
6BUOFT-063
DTCs received.
~ o '
to step 25.
Is voltage less than 0.2 volt?
Key OFF.
Remove jumper and go to next step.
Disconnect suspect H02S connector and jumper H02S
SIG at H02S connector to battery negative terminal.
Inspect both ends of connector for damaged
Key ON, engine running.
or pushed out pins, moisture, corrosion or
Activate KOER self-test.
I
loose pins, and service as necessary. If OK,
Are DTCs PI131 or PI151 present?
replace PCM.
Reconnect vacuum hose and H02S
connector.
Go to next step.
Replace H02S and reconnect vacuum hose.
Go to step 25.
Key OFF.
Leave suspect H02S disconnected.
Disconnect any vacuum hose from vacuum tree.
Start engine and run at 2000 rpm.
Is voltage between H02S SIG and SIG RTN at H02S
connector less than 0.4 volts within 30 seconds?
Yes
No
Key ON, engine running.
Engine at operating temperature.
Access suspect H02S PID or 0 2 s on scan tool while
wiggling, bending and shaking small sections of vehicle
harness from PCM to H02S.
Did H02S PID stay greater than 0.45 volt or less than
0.45 volt?
Yes
i
Isolate cause of lack of H02S switching.
I
Go to step 25.
I
- -
No Go to next step.
Access H02S PID or 0 2 s on scan tool.
Unable to duplicate fault. Testing complete at
Does H02S PID appear to switch properly while driving this time.
vehicle under different road corrditions in an attempt to
Replace H02S.
simulate original fault?
Go to step 25.