Suzuki SX4 Service Manual page 173

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DTC Troubleshooting
NOTE
Before this troubleshooting is performed, read the precautions for DTC troubleshooting referring to
"Precautions for DTC 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
connector.
3) With ignition switch turned ON, measure voltage
between "BLK/RED" wire terminal of EGR valve
connector and vehicle body ground.
Is check voltage 10 – 14 V?
3
Wire circuit check
1) Disconnect connectors from 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
terminals of EGR valve connector.
Is each voltage 0 V?
4
Wire circuit check
1) With ignition switch turned OFF, measure resistance
between engine ground and each "GRN/RED", "GRN/
ORN", "WHT/RED", "BRN/YEL" wire terminals of EGR
valve connector.
Is resistance infinity?
5
Short circuit check for EGR valve control circuit
1) With ignition turned OFF, measure resistance between
each EGR valve control circuit wire ("GRN/RED", "GRN/
ORN", "WHT/RED" and "BRN/YEL" wire) and each EGR
valve control circuit wire.
Is each resistance infinity?
6
EGR valve stepper motor coil circuit check
1) With ignition switch turned OFF, connect EGR valve
connector.
2) Measure resistance between "E01-1/16" and each "C01-
4", "C013", "C01-19", "C01-18" terminals of ECM
connector.
Is each resistance 20 – 31
7
EGR valve check
1) Check EGR valve resistance referring to "EGR Valve
Inspection (If Equipped) in Section 1B".
Is resistance within specified value?
Action
°
°
at 20
C, 68
F?
Engine General Information and Diagnosis:
Yes
Go to Step 2.
Go to Step 3.
Go to Step 4.
Go to Step 5.
Go to Step 6.
Faulty ECM. Substitute
a known-good ECM and
recheck.
Faulty wire(s) are open
or high resistance
circuit. If wires are OK,
substitute a known-
good ECM and recheck.
1A-123
No
Go to "Engine and
Emission Control
System Description".
"BLK/RED" wire is open
circuit.
Faulty wire(s) are
shorted to other circuit.
If wires are OK,
substitute a known-
good ECM and recheck.
Faulty wire(s) are
shorted to ground
circuit.
If wires are OK,
substitute a known-
good ECM and recheck.
Faulty wire(s) are short
circuit.
Go to Step 7.
Faulty EGR valve.

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