Suzuki GRAND VITARA XL-7 Owner's Manual page 252

TROUBLESHOOTING
Step
1 Was "ENGINE DIAG. FLOW TABLE" per-
formed?
2 Is there DTC P0403 (EGR circuit malfunction)? Go to DTC P0403 Diag.
3 Do you have SUZUKI scan tool?
4 EGR valve operation check :
1) With ignition switch OFF, install SUZUKI
scan tool.
2) Check EGR system referring to Section
6E2.
Is it in good condition?
5 MAP sensor check :
1) Check MAP sensor for performance refer-
ring to Section 6E2.
Is check result satisfactory?
6 EGR valve power supply circuit check :
1) With ignition switch OFF, disconnect EGR
valve coupler.
2) With ignition switch ON, check voltage
between C04-2 and ground, C04-5 and
ground.
Is each voltage 10 – 14 V?
7 EGR valve stepper motor coil circuit check :
1) With ignition switch OFF, connect EGR
valve coupler and disconnect ECM (PCM)
couplers.
2) Check resistance between C51-3-4 and
C51-2-12, C51-2-13, C51-2-14, C51-2-15.
Is each resistance 20 – 24 Ω at 20°C (68°F)?
8 MAP sensor check :
1) Check MAP sensor for performance refer-
ring to Section 6E2.
Is check result satisfactory?
ENGINE GENERAL INFORMATION AND DIAGNOSIS (H27 ENGINE) 6-1-91
Action Yes
Go to Step 2.
Flow Table.
Go to Step 4.
Go to Step 5.
Intermittent trouble or
faulty ECM (PCM). Check
for intermittent referring to
"INTERMITTENT AND
POOR CONNECTION" in
Section 0A.
Go to Step 7.
Go to Step 8.
EGR passage clogged or
EGR valve malfunction.
If all above are OK, inter-
mittent trouble or faulty
ECM (PCM).
Check for intermittent
referring to "INTERMIT-
TENT AND POOR CON-
NECTION" in Section 0A.
No
Go to "ENGINE DIAG.
FLOW TABLE" in this
section.
Go to Step 3.
Go to Step 6.
Go to Step 6.
Repair or replace.
Faulty "BLU/BLK" wire.
Faulty EGR valve.
Repair or replace.