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DTC P0102, P0103 MAF SENSOR
EC-649
[QR (WITHOUT EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
M
A
EC
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.
Diagnostic Procedure BBS001ND
1. INSPECTION START
Which malfunction (P0102 or P0103) is duplicated?
P0102 or P0103
P0102 >> GO TO 2.
P0103 >> GO TO 3.
2. CHECK INTAKE SYSTEM
Check the following for connection.
● Air duct
● Vacuum hoses
● Intake air passage between air duct to intake manifold
OK or NG
OK >> GO TO 3.
NG >> Reconnect the parts.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM CONDITION DATA (DC Voltage)
50 OR Mass air flow sensor
[Ignition switch: ON] Approximately 0.4V
[Engine is running]
● Warm-up condition
● Idle speed
0.7 - 1.1V (QR20DE)
0.8 - 1.2V (QR25DE)
[Engine is running]
● Warm-up condition
● Engine is revving from idle to about 4,000 rpm
0.7 - 1.1 to Approximately 4.0V
(QR20DE)
0.8 - 1.2 to Approximately 4.0V
(QR25DE)
(Check for liner voltage rise in
response to engine being
increased to about 4,000 rpm.)
67 B/P
Sensor ground
(Mass air flow sensor)
[Engine is running]
● Warm-up condition
● Idle speed
Approximately 0V
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