Suzuki Wagon R Plus RB310 - Page 282

ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE) 6-2-107
Troubleshooting
Step Action Yes No
1Was “Engine and Emission Control System
Check” performed?
Go to Step 2. Go to “Engine and Emis-
sion Control System
Check” in this section.
2 Is there DTC(s) other than “P0171” and “P0172”? Go to applicable DTC
flow table.
Go to Step 3.
3 Check intake system and exhaust system for
leakage.
Are intake system and exhaust system in good
condition?
Go to Step 4. Repair or replace.
4 Check fuel pressure referring to “Table B-3 Fuel
Pressure Check” in this section.
Is check result satisfactory?
Go to Step 5. Repair or replace.
5 Check fuel injectors referring to “Fuel Injector
Inspection” in Section 6E2.
Is check result satisfactory?
Go to Step 6. Faulty injector(s) or its
circuit.
6 Visual inspection.
Check MAF sensor and air intake system for:
1) Objects which block measuring duct and
resistor of MAF sensor.
2) Other air flow which does not pass the MAF
sensor.
Are there in good condition?
Go to Step 7. Repair or replace.
7 MAF sensor performance check.
1) With ignition switch turned OFF, install scan
tool.
2) Start engine and warm up to normal opera-
tion temperature.
3) Check MAF value using scan tool, under the
following conditions.
MAF value specification
Idling: 1.0 – 4.0 g/sec.
Racing at 2500 r/min: 4.0 – 12.0 g/sec.
Is each value as specified?
Go to Step 8. Go to “DTC P0102 Mass
Air Flow Circuit Low
Input” and “DTC P0103
Mass Air Flow Circuit
High Input” in this sec-
tion.
8 Check ECT sensor referring to Step 3 and 4 of
DTC P0118 diag. flow table.
Is check result satisfactory?
Go to Step 9. Faulty ECT sensor or its
circuit.
9 Check HO2S–1 referring to Step 2 of DTC P0131
diag. flow table.
Is check result satisfactory?
Substitute a known-good
ECM and recheck.
Faulty HO2S–1 or its cir-
cuit.