Mazda Protege 5. Manual — part 179
CONTROL SYSTEM [FS]
01–40B–25
01–40B
IAC signal
•
PCM terminal: 83(+)-103(-)
•
Oscilloscope setting: 2 V/DIV(Y), 0.5 ms/DIV(X),
DC range
•
Vehicle condition: idle after warm up
SGC signal
•
PCM terminal: 85(+)-86(-)
•
Oscilloscope setting: 1 V/DIV(Y), 10 ms/DIV(X),
AC range
•
Vehicle condition: idle after warm up
Shift solenoid B cointrol signal
•
PCM terminal: 99(+)-103(-)
•
Oscilloscope setting: 5 V/DIV(Y), 5ms/DIV(X), DC
range
•
Vehicle condition: Drive in D range, 1st gear
Shift solenoid C cointrol signal
•
PCM terminal: 102(+)-103(-)
•
Oscilloscope setting: 5 V/DIV(Y), 5 ms/DIV(X),
DC range
•
Vehicle condition: Drive in 1st or 2nd gear
End Of Sie
Z3U0140W017
Z3U0140W032
Z3U0140W016
Z3U0140W016
1712-1U-01G(01-40B).fm 25 ページ 2001年6月29日 金曜日 午前9時51分
CONTROL SYSTEM [FS]
01–40B–26
INSPECTION USING AN OSCILLOSCOPE (REFERENCE) [FS]
A3U014018881W04
Purpose
The use of oscilloscope makes the inspection of a
part such as a stuck solenoid value possible without
actually removing parts.
When Normal
Counter electromotive voltage A, generated when the
three-way solenoid valve or the fuel injector is turned
off from on, shows irregular convergence because
induced electromotive voltage B, generated by the
plunger return operation, is added to it.
When Plunger Stuck
When the plunger is stuck, pulse convergence is
smooth because no induced electromotive voltage B
is generated.
End Of Sie
X3U101WNT
X3U101WNU
X3U101WNV
1712-1U-01G(01-40B).fm 26 ページ 2001年6月29日 金曜日 午前9時51分
CONTROL SYSTEM [FS]
01–40B–27
01–40B
INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION [FS]
A3U014018845W01
Resistance Inspection
Note
•
Perform the following test only when directed.
1. Remove the IAT sensor.
2. Measure the resistance of the IAT sensor terminals A and B using an ohmmeter.
•
If not as specified, replace the IAT sensor.
•
If IAT sensor is okay, but PID value or PCM terminal 39 voltage is out of specification, carry out the “Circuit
Open/Short Inspection”.
Specification
IAT sensoir signal characteristic (reference)
Circuit Open/Short Inspection
1. Disconnect the PCM connector. (See 01–40B–7 PCM REMOVAL/INSTALLATION [FS].)
2. Connect the SST (104 Pin Breakout Box) to the
PCM as shown.
3. Tighten the connector attaching screw.
Tightening torque
7.9—10.7 N·m
{80—110 kgf·cm, 69.5—95.4 in·lbf}
4. Inspect for an open or short circuit in the following
wiring harnesses by probing the applicable
sensor and SST (104 Pin Breakout Box) terminals
with ohmmeter leads.
•
If there is an open or short circuit, repair or
replace wiring harnesses.
•
If there is no open or short circuit, replace the IAT sensor.
Open circuit
•
IAT signal circuit (IAT sensor connector terminal A and PCM connector terminal 39)
•
GND circuit (IAT sensor connector terminal B and PCM connector terminal 91)
Ambient temperature (
°°°°
C {
°°°°
F})
Resistance (kilohm)
20 {68}
2.0—2.9
80 {176}
0.27—0.37
Z3U0140W021
X3U140WE8
1712-1U-01G(01-40B).fm 27 ページ 2001年6月29日 金曜日 午前9時51分
CONTROL SYSTEM [FS]
01–40B–28
Short circuit
•
IAT signal circuit (IAT sensor connector
terminal A and PCM connector terminal 39 to
GND)
5. Install the IAT sensor.
End Of Sie
MASS AIR FLOW (MAF) SENSOR INSPECTION [FS]
A3U014013210W01
Note
•
Perform the following test only when directed.
1. Visually inspect for damage, cracks, terminal bends and terminal rust on the MAF sensor.
•
If any of the above is found, replace the MAF sensor.
•
If the MAF sensor is okay, but PID value or PCM terminal 88 voltage is out of specification, carry out the
“Circuit Open/Short Inspection”.
Circuit Open/Short Inspection
1. Remove the PCM. (See 01–40B–7 PCM REMOVAL/INSTALLATION [FS].)
2. Connect the SST (104 Pin Breakout Box) to the
PCM as shown.
3. Tighten the connector attaching screw.
Tightening torque
7.9—10.7 N·m
{80—110 kgf·cm, 69.5—95.4 in·lbf}
4. Inspect for an open or short circuit in the following
wiring harnesses by probing the applicable
sensor and SST (104 Pin Breakout Box) terminals
with ohmmeter leads.
•
If there is an open or short circuit, repair or
replace wiring harnesses.
•
If there is no open or short circuit, replace the MAF sensor.
Open circuit
•
MAF signal circuit (MAF sensor connector terminal B and PCM connector terminal 88)
•
Power circuit (MAF sensor connector terminal C and main relay terminal D through common connector)
•
GND circuit (MAF sensor connector terminal A and PCM connector terminal 103 through common
connector)
Y3U140WB1
X3U140WE8
Y3U140WB2
1712-1U-01G(01-40B).fm 28 ページ 2001年6月29日 金曜日 午前9時51分
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