Suzuki Ignis Service Manual page 3329

6-128 ENGINE GENERAL INFORMATION AND DIAGNOSIS
TROUBLESHOOTING
Step
1 Was "Engine and Emission Control System
Check" performed?
2 EGR valve power supply circuit check.
1) Remove air intake pipe.
2) With ignition switch turned OFF, disconnect
EGR valve coupler.
3) With ignition switch turned ON, check volt-
age between "BLK/RED" wire terminals of
EGR valve coupler and body ground.
Is check voltage 10 – 14 V?
3 Check wire circuit.
1) Disconnect connectors from ECM with igni-
tion switch turned OFF.
2) Turn ON ignition switch.
3) Measure voltage between engine ground
and each "GRN/RED", "GRN/ORN", "WHT/
RED", "BRN/YEL" wire terminal of EGR
valve connector.
Is each voltage 0 V?
4 Check wire circuit.
1) With ignition switch turned OFF, measure
resistance between engine ground and
each GRN/RED", "GRN/ORN", "WHT/
RED", "BRN/YEL" wire terminal of EGR
valve connector.
Is resistance infinity?
5 EGR valve stepper motor coil circuit check.
1) With ignition switch turned OFF, connect
EGR valve coupler.
2) Check resistance between "G91-5/6" and
each "C64-17", "C64-34", "C64-16", "C64-
33" wire terminal of ECM connector.
Is each resistance 20 – 24 Ω at 20°C, 68°F?
6 Check wire circuit.
1) Connect connectors to ECM with ignition
switch turned OFF.
2) Turn ON ignition switch.
3) Measure voltage between engine ground
and each "GRN/RED", "GRN/ORN", "WHT/
RED", "BRN/YEL" wire terminal of EGR
valve connector.
Is each voltage 10 – 14 V?
Action Yes
Go to Step 2.
Go to Step 3.
Go to Step 4.
Go to Step 5.
Faulty ECM substitute a
known-good ECM and
recheck.
Some wire in high resis-
tance circuit.
If wires are good condi-
tion, faulty EGR valve.
No
Go to "Engine and Emis-
sion Control System
Check" in this section.
Faulty "BLK/RED" wire.
Some wire shorted to
other circuits.
If wires are OK, substi-
tute a known-good ECM
and recheck.
Some wire shorted to
ground circuit.
If wires are OK, substi-
tute a known-good ECM
and recheck.
Go to Step 6.
Some wire open circuit.
If wires are good condi-
tion, faulty EGR valve.