Maf And Iat Sensor On-Vehicle Inspection; Maf And Iat Sensor Removal And Installation - Suzuki Swift Sport 2004 Service & Repair Manual

MAF and IAT Sensor On-Vehicle Inspection

NOTE
Before performed this inspection, be sure to
read the "Precautions of ECM Circuit
Inspection in Section 1A".
1) Disconnect negative (–) cable at battery.
2) Disconnect MAF and IAT sensor connector.
3) Connect voltmeter to "BLK/RED" wire terminal (2) of
MAF and IAT sensor connector (1) disconnected and
ground.
4) Turn ON ignition switch position and check that
voltage is battery voltage.
If not, check if wire harness is open or connection is
poor.
5) Turn OFF ignition switch position and connect
connector to MAF and IAT sensor.
6) Remove ECM from its bracket referring to "ECM
Removal and Installation".
7) Connect special tool between ECM and ECM
connector referring to "Inspection of ECM and Its
Circuits in Section 1A".
8) Turn ON ignition switch position and check MAF
signal voltage between "C37-26" terminal circuit and
"C37-27" terminal circuit of special tool.
MAF signal voltage between "C37-26" terminal
circuit and "C37-27" terminal circuit of special
tool
MAF signal voltage of MAF and IAT sensor with
ignition switch turned ON: 0.5 – 1.0 V
"C37-27"
1. ECM
9) Start engine and check that voltage is lower than 5 V
and it rises as engine speed increases.
MAF signal voltage between "C37-26" terminal
circuit and "C37-27" terminal circuit of special
tool
MAF signal reference voltage of MAF and IAT
sensor at specified Idle speed: 1.3 – 1.8 V
S7RS0B1306018
I3RB0A130009-01
"C37-26"
1
I4RS0A130009-01
Engine Electrical Devices:
10) If check result is not as specified above, cause may
lie in wire harness, connector connection, MAF and
IAT sensor or ECM.

MAF and IAT Sensor Removal and Installation

CAUTION
!
• Do not disassemble MAF and IAT sensor.
• Do not expose MAF and IAT sensor to any
shock.
• Do not clean MAF and IAT sensor.
• If MAF and IAT sensor has been dropped, it
should be replaced.
• Do not blow compressed air by using air
gun or the like.
• Do not put finger or any other object into
MAF and IAT sensor. Malfunction may
occur.
Removal
1) Disconnect negative (–) cable at battery.
2) Disconnect MAF and IAT sensor connector.
3) Remove air cleaner case (1).
4) Remove MAF and IAT sensor (2) from air cleaner
case.
1
Installation
Reverse removal procedure noting the followings.
• Tighten MAF and IAT sensor screws to specified
torque.
Tightening torque
MAF and IAT sensor screw (a): 1.5 N·m (0.15 kgf-
m, 1.1 lb-ft)
• Connect MAF and IAT sensor connector securely.
1C-11
S7RS0B1306019
2
I4RS0A130010-01
(a)
I4RS0A130011-01