Mazda B-Series 1997 Workshop Manual page 383

FT
TROUBLESHOOTING GUIDE
Is there a restriction in exhaust system?
,
Yes
page FT-156
Start the engine and bring to normal operating
temperature. Disconnect crankcase ventilation
hose from remote air cleaner. Place a stiff piece
of paper over the hose end.
Does vacuum hold the paper?
ACTION
Go to next step
STEP
I
-__A_-
INSPECTION
Check idle air control solenoid and wiring harness
@
page FT-147
Check throttle body for damage
=
page FT-146
Check PCM
us
page FT-164
Check exhaust system
page FT-156
7 Is idle speed correct7
;
Go to next step
Yes
Remove PCV valve and shake it.
Does PCV valve rattle?
Replace PCV valve
I
Yes Go to next step
Check for contaminated mass air flow sensor.
Is there any contamination?
No
-
- - -
-
- - - - -
Disconnect vacuum hose from EGR valve
and plug it.
Does condition improve?
Check evaporative emission system as follows:
Disconnect evaporative hose and place a stiff
piece of paper over hose
Does vacuum hold paper?
If yes, check evaporative
emission system
G=
page FT-160
If no, check for vacuum leak in PCV system,
oil cap, PCV valve, rocker cover for bolt
torquelgasket leak
Yes Replace the mass air flow sensor
- -
---
- -
No Go to next step
--
Yes
- - -
- - -
-
-
- - -
Check as follows:
EGR vacuum regulator solenold for st~cklng
Cond~t~on of EGR vacuum regulator solenold
connector female term~nal(s)
-
- -
-
- -
-
-
- -
Check ~f EGR valve moves smoothly
If yes, go to next step
If no, replace EGR valve
Check starting system.
Section G
Is starting system normal?
Yes Go to next step
- .
- -
Repair or replace components as required
Verify test results
If OK, return to diagnostic index to service any additional symptoms
MF1460-F2 6BUOFT-013