Mazda B-Series 1997 Workshop Manual page 441

FT
ON-BOARD DIAGNOSIS SYSTEM
STEP INSPECTION ACTION
Key OFF
Install breakout box, leave PCM disconnected
D~sconnect suspect H02S sensor connector.
lnspect both ends of connector for damaged or pushed
out plns, moisture, corrosion or loose pins, and service
I
Measure resistance between H02S SIG test pin at
breakout box and H02S SIG at H02S sensor connector
- H02S-11 SIG. Test pln 60
-
H02S-21 SIG. Test pin 87
Measure SIG RTN test pln at breakout box and H02S SIG
RTN at sensor connector
- H02S SIG RTN Test pln 91
Is each resistance less than 5.0 ohms?
--
- -
- -
- -
-
Key OFF.
Leave PCM and suspect H02S connector disconnected
Measure
resistance
between H02S SIG test pin and test
pins 24,51,76, 77 and 103 at breakout box
- H02S-11 SIG Test pin 60
- H02S-21 SIG Test pin 87
Is each resistance greater than 10,000 ohms?
12 , Key OFF.
,
lnspect H02S harness for chafing, burned out wires or
I
other damage, and service.
(
lnspect H02S and connector for indications of submission
Yes Go to next step.
13
No H02S system is OK. Fuel system is OK.
Testing is complete at this time.
in water, oil or coolant, and service as necessary.
Run engine at 2000 rpm for two minutes.
Activate KOER self-test.
Are DTCs P I 131 and/or PI1 51 present?
Key OFF.
Disconnect suspect H02S connector.
Run engine at 2000 rpm for two minutes.
Activate KOER self-test.
Does voltmeter indicate greater than 0.5 volt during or at
the end of self-test?
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7
1
Yes Go to next step.
Replace H02S.
Go to step 25.
;
Yes Go to next step.
I
I
Repair open in H02S SIG or SIG RTN circuit.
Go to step 25.
Yes
,
Go to next step.
I
~
Repair short circuit.
Go to step 25.
Key OFF.
Leave PCM disconnected.
Reconnect H02S connector.
Measure resistance between PWR GNDISIG RTN test pin
and H02S SIG test pin at breakout box.
-
H02S-11 SIG: Test pin 60
-
H02S-21 SIG: Test pin 87
- H02S PWR GND: Test pin 24,76 and 103
-
H02S SIG RTN: Test pin 91
Is resistance greater than 10,000 ohms?
Yes
For DTCs PI130 and P I 150:
Go to next step.
For Continuous Memory DTCs PI131
and P1151:
Go to step 23.
For KOER DTCs PI131 and PI1 51 :
Re~lace PCM.
Replace H02S.
Go to step 25.
Key OFF. Connect scan tool or NGS to data link
1 :
Go to next step.
connector.
-
Key ON, engine running.
Go to "intermittent Concerns."
Activate
KOER.
U L T
page
FT-69
Are DTCs PI1 32 or PI152 present?
Key OFF.
Disconnect suspect H02S connector.
lnspect PCM for damaged or pushed out pins, corrosion
or loose wires, and service as necessary.
Install breakout box, leave PCM disconnected.
Measure resistance between the following appropriate test
pins at breakout box:
-
For DTC P1130lP1132:
Test pin 60 and test pins 71,93 and 97
-
For DTC PI1 50lP1152:
Test pin 87 and test pins 71,93 and 97
Is resistance greater than 10,000 ohms?
Key ON, engine off.
t
Yes
(
Go to next step.
Yes
Access H02S PID or 0 2 s on scan tool corresponding to
DTCs received.
Is voltage greater than 1.0 volt and less than 4.0 volts?
Go to next step.
No Go to step 21.
Repair short to power.
Go to step 25.