Suzuki 2000 Grand Vitara SQ625 Service Manual page 87

TROUBLESHOOTING (DTC P0403/DTC No.51)
STEP
1 Was "ENGINE DIAG. FLOW TABLE" performed?
2 EGR Valve Check:
1) With ignition switch OFF, disconnect connector
from EGR valve.
2) Check for proper connection to EGR valve at each
terminal.
3) If OK, check EGR valve for resistance referring
to "EGR Valve Inspection" in Section 6E1.
Is check result as specified?
3 Wire Harness Check:
1) Connect connector to EGR valve.
2) Remove ECM (PCM) cover and disconnect connector
from ECM (PCM).
3) Check for proper connection to ECM (PCM) at system
related terminals.
4) If OK, check for resistance between following
terminals of ECM (PCM) connector disconnected.
C51-2-13 and C51-3-4
C51-2-14 and C51-3-4
C51-2-15 and C51-3-4
C51-2-16 and C51-3-4
C51-2-13 and ground
C51-2-14 and ground
C51-2-15 and ground
C51-2-16 and ground
Is check result as specified?
ACTION
20 – 24 W at
20_C, 68_F
Infinity (8)
ENGINE DIAGNOSIS (G16 / J20 ENGINES) 6-83
YES
Go to Step 2.
Go to Step 3.
Intermittent trouble
or faulty ECM
(PCM).
Recheck referring
to "Intermittent and
Poor Connection" in
Section 0A.
NO
Go to "ENGINE
DIAG. FLOW
TABLE".
EGR valve
malfunction.
"Bl/B", "Lg", "Lg/W"
"Lg/Y" or "Lg/R"
circuit open or
shorted to ground.