Suzuki Grand Vitara Service Manual page 144

1A-137 Engine General Information and Diagnosis:
Step
4 Wire circuit check
1) With ignition switch turned OFF, measure resistance
between engine ground and each "YEL/BLK", "YEL/
RED", "YEL/GRN", "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 ("YEL/BLK", "YEL/
RED", "YEL/GRN" and "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 "E23-1/16" and each "C37-
3", "C37-4", "C37-5", "C37-6" terminals of ECM
connector.
Is each resistance 20 – 31
7 EGR valve check
1) Check EGR valve resistance referring to "EGR Valve
Inspection: in Section 1B".
Is resistance within specified value?
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Action
Ω ° °
at 20 C, 68 F?
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Yes
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.
No
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.