Suzuki Baleno Manual page 1390

6-2-42 ENGINE GENERAL INFORMATION AND DIAGNOSIS (J18 ENGINE WITH WU TWC)
DTC TROUBLESHOOTING
STEP
1 Was "ENGINE DIAG. FLOW TABLE" per-
formed?
2 MAF Sensor Power Supply Voltage check:
1) With ignition switch OFF, disconnect MAF
sensor connector (1).
2) With ignition switch ON, check voltage
between C42-3 (2) and ground.
Is voltage 10 – 14 V?
3 MAF Sensor Output Voltage check:
1) With ignition switch OFF, connect MAF
sensor connector.
2) Remove ECM cover.
3) With ignition switch ON leaving engine
OFF, check voltage between C20-24 and
C20-27 terminal.
Is voltage 0.5 – 1.0 V?
Fig.1 for Step 2
ACTION YES
Go to Step 2.
Go to Step 3.
Poor C20-24 or/and
C20-27 terminal connec-
tion.
If OK, substitute a known-
good ECM and recheck.
NO
Go to "ENGINE DIAG.
FLOW TABLE".
Faulty "R/B" wire.
Faulty "G" wire and "Or"
wire.
Poor C42 connector termi-
nal connection.
If wire and connection are
OK, substitute a known-
good MAF sensor and re-
check.