Suzuki Baleno Manual page 1310

6-1-80 ENGINE GENERAL INFORMATION AND DIAGNOSIS (G13/G16 ENGINE WITH WU TWC)
DTC P0400 EXHAUST GAS RECIRCULATION FLOW MALFUNCTION
CIRCUIT DESCRIPTION
Ignition
switch
Relay
box
Main fuse
DTC DETECTING CONDITION
D While running at specified vehicle speed after engine
warm-up
D During deceleration (engine speed high with closed
throttle position ON) in which fuel cut is involved, dif-
ference in intake manifold absolute pressure between
when EGR valve is opened at specified value and
when it is closed is larger or smaller than specified
value.
: 2 driving cycle detection logic, monitoring once / 1
driving
Main
relay
D EGR valve or its circuit
D EGR passage
D ECM (PCM)
POSSIBLE CAUSE
ECM
(PCM)