Mazda B-Series 1997 Workshop Manual page 457

FT
ON-BOARD DIAGNOSIS SYSTEM
INSPECTION
Disconnect EVR solenoid connector.
ACTION
Yes Go to next step.
Key ON, engine off.
I
No Repair open in VPWR circuit.
Is voltage between VPWR circuit at EVR solenoid
Go to step 32.
connector and chassis ground greater than 10.5 volts?
- -
Yes Go to next step.
1
Leave EVR solenoid connector drsconnected.
I I
IS resistance across solenold between 26 and 40 ohms7
Replace EVR solenold
Go to steo 32.
EVR solenoid connector
disconnected.
I
Yes Repair short in EVR circuit to PWR.
Install breakout box, leave PCM disconnected.
,
Go to step 32.
Key ON, engine off.
- -
Is voltage between EVR test pin 47 at breakout box and
/
NO
GO
to next step.
I
chassis ground greater than 1.0 volt7
I
--
- - -
-
/
5
Key OFF
,
Leave EVR and PCM disconnected.
I
Yes Go to next step.
I
Is resistance between EVR test pin 47 at breakout box and
N , R~~~~~ open EVR
EVR arcuit at EVR solenold connector less than 5.0
Go to step 32.
ohms?
- -
-
Yes Replace PCM.
Reconnect PCM and EVR connectors. Go to step 32.
I I
Disconnect vacuum hose at EGR valve and connect a
vacuum gauge to hose.
Key 0N,>n$ne running.
I
No Replace EVR solenoid.
Jumper EVR test pin 47 at breakout box to chass~s
1
ground.
Go to step 32.
/
Is vacuum gauge reading 4.0 in-Hg or greater?
31 Record all DTCs received for reference and clear DTCs
Complete EGR monitor drive cycle.
Perform KOEO and KOER self-test
I
Is DTC PO400 output?
DTC PO400 is only output from
ontinuous Memory:
nspect EGR valve and intake man~fold for
ontamlnatron and restr~ct~on. If OK, go to
Intermcttent Concerns
"
@
page FT-69
TEST PIN 65
TEST PIN 91
TEST PIN 90
DPFE SIG
~ S I G RTN
VREF
DIFFERENTIAL
PFE (DPFE)
SENSOR
CONNECTOR
(VIEW FROM PIN SIDE)
I
'TEST PINS LOGATED ON BREAKOUT BOX
TEST PIN 71197 R EVR SOLENOID
TEST PIN 47 BRIP CONNECTOR
(VIEW FROM PIN SIDE)
'TEST PlNS LOCATED ON BREAKOUT BOX