Suzuki Engine 2002 GRAND VITARA SQ625, Service Manual

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6-1-110 ENGINE GENERAL INFORMATION AND DIAGNOSIS (H25 ENGINE)
[A] Fig. for Step 4 / [B] Fig. for Step 5
4 EGR Valve Power Supply Circuit check :
1) With ignition switch OFF, disconnect EGR
valve coupler (1).
2) With ignition switch ON, check voltage
between C04-2 (“BLU/BLK” wire terminal of
EGR valve coupler) and ground, C04-5
(“BLU/BLK” wire terminal of EGR valve cou-
pler) and ground.
Is each voltage 10 – 14 V?
Go to Step 5. Faulty “BLU/BLK” wire.
5 EGR Valve (2) Stepper Motor Coil Circuit check
:
1) With ignition switch OFF, connect EGR cou-
pler and disconnect ECM (PCM) couplers.
2) Check resistance between C51-2-20 and
C51-2-4, C51-2-5, C51-2-16, C51-2-17.
Is each resistance 20 – 24
Ω
?
Stuck or faulty EGR valve
(2).
Clogged EGR gas pas-
sage.
MAP sensor malfunction.
If OK, substitute a known-
good ECM (PCM) and
recheck. Faulty “LT GRN”, “LT
GRN/WHT”, “LT GRN/
RED”, “LT GRN/YEL” wire
or EGR valve (2).
Step Action Yes No
3. Connector