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EC-1546
[YD (WITHOUT EURO-OBD)]
DTC P0102, P0103 MAF SENSOR
Specification data are reference values, and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM CONDITION
DATA
(DC Voltage)
54 W Mass air flow sensor
[Ignition switch: ON] Approximately 0.7V
[Engine is running]
● Warm-up condition
● Idle speed
1.6 - 1.9V
[Engine is running]
● Warm-up condition
● Engine is revving from idle to about 4,000
rpm.
1.6 - 1.9V to Approximately 4.3V
(Check for liner voltage rise in
response to engine being
increased to about 4,000 rpm)
67 —
Sensor ground
(Sensors shield circuit)
[Engine is running]
● Warm-up condition
● Idle speed
Approximately 0.3V
73 B
Mass air flow sensor
ground
[Engine is running]
● Warm-up condition
● Idle speed
Approximately 0.3V
105
113
G
G
ECM relay (self-shutoff)
[Ignition switch ON]
[Ignition switch OFF]
● For a few seconds after turning ignition
switch OFF
Approximately 1.2V
[Ignition switch OFF]
● More than a few seconds after turning igni-
tion switch OFF
BATTERY VOLTAGE
(11 - 14V)
119
120
Y
R
Power supply for ECM [Ignition switch ON]
BATTERY VOLTAGE
(11 - 14V)
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