Control System Specification (For 4.0L) - Mazda B-Series 1997 Workshop Manual

CONTROL SYSTEM (FOR 4 . 0 ~ )
FT
I
Terminal
1
Connected To Test Condition
/
Specification
I
Remark
1
Possible Cause
I
I
Key ON
Mass air flow (MAF) -
sensor
/
Driving 48 kmlh (30 mph) 0.8-1.6V
Open or short circuit from
MAF to PCM.
I
Driving 88 kmlh (55 mph) 1.5-2.5V
/
Throttle position (TP)
sensor
Key
(3N
Hot idle
- -
-
Driving 48 kmlh (30
Driving 88 kmlh (55 mph)
I
1 .l-1.4V
Open or short circuit from
TP to PCM.
!
/
Key ON 5V Open or short VREF from
1
PCM.
O V PCM malfunction.
Vehicle reference
voltage (VREF)
90
(Output)
/
constant
I
OV
1
-
/
Open circuit.
Brake OnIOff (BOO)
/
( l : : u t ) iswitch
Brake pedal depressed
+ - - -
Open or short circuit from
1
Brake pedal released
PID OFF
Boo
to PCM.
- .
- -
93
1
Heated oxygen sensor
'ID OFF
'
Open or short circu~t from
(Input) -1 1 (FRT.RT.) Engine runnlng at normal
1
sensor to PCM.
I
operating temperature
PID ON Contaminated sensor.
K ~ Y ON
+ ' d P , ~ l
Heated oxygen sensor
Open or short circuit from
-21 (FRT.LFT)
Engine running at normal
sensor to PCM.
operating temperature Contaminated sensor.
Key ON
Heated oxygen sensor ---------
I
B+
I
PI0 OFF
1
Open or short c~rcult from
-1 2 (rear) Engl~ie runnlng at normal 0.2V
sensor to PCM.
operatlng temperature
PID ON Contammated sensor.
Key ON
Key OFF
Open or short circuit from
PCM power relay to
PCM.
Vehicle power
3.4-3.6 msec
- -
- .
- - - - -
-
Driving 88 kmlh (55 mph) 5-8.8 msec
Open or short circuit from
injector #6 to PCM.
Key ON
Hot ~dle
- -
- -
Drlv~ng 88 kmlh (55 mph) 5-8.8 msec
Open or short circuit from
injector
#4
to PCM.
Key ON B+
Hot idle 3.4--3.6 msec
Driving 88 kmlh (55 mph) 5-8.8 msec
Clpen or short circuit from
injector
#2
to PCM.
I
1
103 ! Power ground
Constant
Poor connection at PCM.
FT-I 69