Suzuki 2006 SX4, Service Manual

Page: 109 / 1478

Engine General Information and Diagnosis: 1A-65
3 MAF sensor power supply voltage check
1) Disconnect connector from MAF sensor with ignition
switch turned OFF.
2) Check for proper terminal connection to MAF sensor and
ECM connectors.
3) If connections are OK, turn ignition switch to ON
position.
4) Check that MAF sensor power supply voltage is battery
voltage.
Is it in good condition?
Go to Step 4. Repair or replace MAF
sensor power supply
circuit.
4 Wire harness check
1) Turn ignition switch OFF position.
2) Disconnect connector from ECM.
3) Check that MAF sensor circuit is as follows.
• Wiring harness resistance of each MAF sensor signal
circuit and ground circuit is less than 3
Ω
.
• Insulation resistance between MAF sensor signal
circuit and vehicle body ground is Infinity.
• Insulation resistance of wire harness is infinity
between MAF sensor signal terminal and each other
terminal at MAF and IAT sensor connector.
• Circuit voltage of each MAF sensor signal circuit and
ground circuit is 0 – 1 V with ignition switch turned
ON.
Are they in good condition?
Go to Step 5. Repair or replace
defective wire harness.
5 MAF sensor signal check
1) Turn ignition switch OFF position.
2) Connect connectors to MAF sensor and ECM.
3) Check MAF sensor signal voltage referring to “Mass Air
Flow (MAF) and Intake Air Temperature (IAT) Sensor
On-Vehicle Inspection in Section 1C”.
Is each value within specified range?
Substitute a known-
good ECM and recheck. Replace MAF and IAT
sensor.
Step Action Yes No
I7RW01110047-01