Suzuki Wagon R Plus RB310, Service Manual

Page: 296 / 846

ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE) 6-2-121
DTC Detecting Condition and Trouble Area (DTC P0401/P0402)
DTC Confirmation Procedure (DTC P0401/P0402)
1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Start engine and warm up to normal operating temperature.
4) Increase engine speed to 3000 rpm in 3rd gear.
5) Release accelerator pedal and with engine brake applied, keep vehicle coasting for 5 sec. or more. (Keep
fuel cut condition for 5 sec. or more) If fuel cut condition is not kept for 5 sec. or more, coast down a slope in
engine speed 1000 – 3000 rpm for 5 sec. or more.
6) Step vehicle and run engine at idle.
7) Check DTC and pending DTC by using scan tool.
Troubleshooting
DTC Detecting Condition Trouble Area
DTC P0401:
Difference in intake manifold absolute pressure
between opened EGR valve and closed EGR valve is
smaller than specified value.
DTC P0402:
Difference in intake manifold absolute pressure
between opened EGR valve and closed EGR valve is
larger than specified value.
(
✱
2 driving cycle detection logic, monitoring once/1
driving)
• EGR valve
• EGR passage
• MAP sensor
• ECM
WARNING:
• When performing a road test, select a place where there is no traffic or possibility of a traffic acci-
dent and be very careful during testing to avoid occurrence of an accident.
• Road test should be carried out with 2 persons, a driver and a tester, on a level road.
NOTE:
Check to make sure that following conditions are satisfied when using this DTC CONFIRMATION PRO-
CEDURE.
• Intake air temp.: –7°C (19.4°F) or higher
• Engine coolant temp.: 70°C (158°F) or higher
• Altitude (barometric pressure): 2500 m, 8200 ft or less (540 mmHg, 72 kPa or more)
Step Action Yes No
1 Was “Engine and Emission Control System Check” per-
formed? Go to Step 2. Go to “Engine and
Emission Control
System Check”.
2 Do you have SUZUKI scan tool? Go to Step 3. Go to Step 5.
3 EGR valve operation check.
1) With ignition switch turned OFF, install SUZUKI scan
tool.
2) Check EGR system referring to “EGR System
Inspection” in Section 6E2.
Is it in good condition?
Go to Step 4. Go to Step 10.