Main Relay, Fuel Pump Relay, Starting Motor Control Relay, Throttle Actuator Control Relay And Radiator Cooling Fan Relay Inspection; Mass Air Flow (Maf) And Intake Air Temperature (Iat) Sensor On-Vehicle Inspection - Suzuki SX4 Service Manual

1C-11 Engine Electrical Devices:
Main Relay, Fuel Pump Relay, Starting Motor
Control Relay, Throttle Actuator Control Relay
and Radiator Cooling Fan Relay Inspection
1) Disconnect negative cable at battery.
2) Remove main relay (1), fuel pump relay (3), starting
motor control relay (2), throttle actuator control relay
(4) and/or radiator cooling fan relay (5) from
individual circuit fuse box No.1.
3) Check that there is no continuity between terminal
"C" and "D". If there is continuity, replace relay.
4) Connect battery positive (+) terminal to terminal "B"
of relay. Connect battery negative (–) terminal to
terminal "A" of relay. Check for continuity between
terminal "C" and "D". If there is no continuity when
relay is connected to the battery, replace relay.
3
"A"
"B"
Mass Air Flow (MAF) and Intake Air
Temperature (IAT) Sensor On-Vehicle
Inspection
NOTE
Before performed this inspection, be sure to
read the "Precautions of ECM Circuit
Inspection in Section 1A".
S7RW0A1306017
5
2
1
4
"C"
"D"
I5RW0A130014-01
S7RW0A1306018
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 "Engine
Control Module (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 "C01-26" terminal circuit and
"C01-27" terminal circuit of special tool.
MAF signal voltage between "C01-26" terminal
circuit and "C01-27" terminal circuit of special
tool
MAF signal voltage of MAF and IAT sensor with
ignition switch turned ON: 0.5 – 1.0 V
"C01-27"
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 "C01-26" terminal
circuit and "C01-27" terminal circuit of special
tool
MAF signal reference voltage of MAF and IAT
sensor at specified Idle speed: 1.3 – 1.8 V
10) If check result is not as specified above, cause may
lie in wire harness, connector connection, MAF and
IAT sensor or ECM.
I3RB0A130009-01
"C01-26"
1
I6RW0D130003-02