Dpfe Sensor - Mazda B-Series 1997 Workshop Manual

ON-BOARD DIAGNOSIS SYSTEM
STEP
1
Diagnostic trouble
code No. P I 400, P I 401
Symptom
INSPECTION ACTION
Key ON, engine off
If less than 0.2 volt: Go to next step.
Access DPFEGR PID
If greater than 4.0 volts:
IS DPFEGR PID voltage less than 0.2 volt or greater than
4.0 volts?
Inspect pressure signal hoses for leaks and
repair or replace as necessary.
I If OK. ao to steD 12.
DPFE SENSOR
DPFE SIG circuit i n ~ u t below minimum or above maximum.
1
Yes Replace damaged DPFE sensor.
Go to step 13.
2
3
4
--
5
I
No Remove jumper wire.
Go to next step.
Key OFF.
Disconnect DPFE sensor connector.
Connect jumper wire between sensor VREF circu~t and
DPFE SIG circuit at DPFE sensor connector.
Key ON, engine off.
Access DPFEGR PID.
Is DPFEGR PID value between 4.0 and 6.0 volts?
Leave DPFE sensor connector.
Key ON, engine off.
Measure voltage between sensor VREF circuit and SIG
RTN circuit at DPFE sensor connector.
Is VREF voltage between 4.0 and 6.0 volts?
Key OFF.
Leave DPFE sensor disconnected.
Install breakout box, leave PCM disconnected.
Measure resistance between DPFE SIG test pin 65 and
SIG RTN test pin 91, PWR GND test pins 5111 03 at
breakout box.
Is each resistance greater than 10,000 ohms?
- - - -- -
Key OFF.
Disconnect DPFE sensor connector.
Key ON, engine off.
j - - -
1
Yes Go to next step.
Is voltage between DPFE SIG circuit at DPFE sensor
I
connector and battery ground terminal greater than 10.5
volts?
j
No Go to Pinpoint Test "VREF."
I
1
Yes Replace PCM.
Go to step 13.
I
I
NO
Repa~r short clrcult between DPFE SIG
I
ground or SIG RTN
Go to step 13.
- i - - _ ,
Yes Go to next step.
No Go to step
7.
i
I
Key OFF Yes
1
Repair short between DPFE SIG and PWR
Leave DPFE sensor connector disconnected.
circuit.
Install breakout box, leave PCM disconnected.
Is voltage between DPFE SIG test pin 65 and PWR GND
- - -
- - -
test pins 51/103 at breakout box greater than 10.5 volts?
Go to ster, 13.
Key OFF.
Disconnect DPFE sensor connector.
Connect a jumper wire between DPFE SIG circuit and SIG
RTN circuit at DPFE sensor connector.
Key ON, engine off.
Access DPFEGR PID.
,
Is DPFEGR PID voltage less than 0.05 volt?
Yes Remove jumper wire
Go to next step.
8
No Go to step 10.
Leave DPFE sensor connector disconnected.
Key ON, engine off.
Measure voltage between VREF and SIG RTN circuits at
DPFE sensor connector.
Is VREF voltage between 4.0 and 6.0 volts?
Yes Go to next step.
Key off.
Leave DPFE sensor connector disconnected.
1
Yes
;
Replace DPFE sensor.
i
Go to steD 13.
No
- -
Go to Pinpoint Test "VREF."
lnstall breakout box, leave PCM disconnected.
,
Is resistance between DPFE SIG test pin 65 and VREF
No
test pin 90 at breakout box greater than 10,000 ohms?
~
Repair short between DPFE SIG and VREF
circuit.
1
Go to step 13.