Mazda B-Series 1997 Workshop Manual page 465

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ON-BOARD DIAGNOSIS SYSTEM
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STEP
Diagnostic trouble
code No. P1405, PI406
Symptom
Exhaust manifold side (upstream) DPFE pressure hose is off or plugged (DTC P1405).
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I - - .
Intake manifold side (downstream) DPFE pressure
. -
hose is off or plugged (DTC P1406).
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INSPECTION ACTION
Key OFF.
Reconnect hose(s) or repair or replace as
Inspect upstream or downstream hose at DPFE sensor
necessary.
and orifice tube assembly for disconnect or poor
connection.
Is hose off or poorly connected?
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Visually inspect upstream or downstream hose routing.
/
Yes
/
Repair or replace hose(s) as necessary.
Hose should not be pinched or have dips in it where water
1
/
Go to step 5.
could settle or freeze.
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Carefully remove upstream or downstream hose and
inspect for plugging, water or leaks.
No
1
Go to next step.
Is there a fault detected in the hose?
DPFE SENSOR
1
Key OFF.
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Yes Replace DPFE sensor.
Disconnect pressure hoses at DPFE sensor.
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Go to step 5.
Connect a hand vacuum pump to downstream plckup
marked "REF on DPFE sensor.
Key ON, englne off and access DPFEGR PID.
1
-
PID voltage should be above 4.0 volts.
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Quickly release vacuum from sensor.
'
No Go to next step.
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PID voltage should drop to less than
1
volt in less
than 3 seconds.
Does DPFEGR PID lndlcate a fault In DPFE sensor?
3
1
5
1
Perform After Repair Procedure to ensure customer's concern has been resolved.
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6BUOFT-072
Inspect connection marked "HI" for DTC PI405 or "REF Yes
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Repa~r or replace DPFE sensor or orlflce tube
for DTC PI406 on DPFE sensor for plugglng or damage at
assembly as necessary
sensor Go to step 5.
Inspect exhaust man~fold s~de pressure plckup hose at
orlflce tube assembly for plugglng or damage.
Is DPFE sensor or or~f~ce tube assembly plugged or
-
No Go to next step
damaged?