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6E1-36 ENGINE AND EMISSION CONTROL SYSTEM
C63-14
C63-28
Mass air flow (MAF) and intake air temperature (IAT)
sensor removal and installation
REMOVAL
1
2
INSTALLATION
Reverse removal procedure noting the followings.
4) Connect voltmeter to "BLK/RED" wire terminal (2) of MAF
and IAT sensor coupler (1) disconnected and ground.
5) Turn ignition switch ON and check that voltage is battery
voltage.
If not, check if wire harness is open or connection is poor.
6) Turn ignition switch OFF and connect coupler to MAF and
IAT sensor.
7) Turn ignition switch ON and check MAF signal voltage
between "C63-14" terminal and "C63-28" terminal of ECM
coupler.
MAF signal voltage of MAF and IAT sensor at ignition
switch ON: 0.5 – 1.0 V
1. ECM
8) Start engine and check that voltage is lower than 5 V and it
rises as engine speed increases.
MAF signal reference voltage of MAF and IAT sensor at
specified ldle speed: 1.3 – 1.8 V
9) If check result is not as specified above, cause may lie in
wire harness, coupler connection, MAF and IAT sensor or
ECM.
1) Disconnect negative cable at battery.
2) Disconnect MAF and IAT sensor coupler (1).
3) Remove MAF and IAT sensor (2) from air cleaner assembly.
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