Suzuki Wagon R Plus RB310 Service Manual page 243

6-2-68 ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE)
Step
9 Check MAF sensor output signal.
1) Connect connectors to MAF sensor and ECM with
ignition switch turned OFF.
2) Check voltage between "E22-14" and "E22-32" under
the following condition.
Voltage between "E22-14" and "E22-32" of ECM con-
nector at ignition switch ON, leaving engine stop: 0.5
– 1.2 V
Idling: 1.0 – 1.8 V
Is each value as specified?
Action Yes
Substitute a known- Faulty MAF and IAT
good ECM and sensor.
recheck.
No