Suzuki 2000 Grand Vitara SQ625 Service Manual page 208

STEP
5 EGR Valve Stepper Motor Coil Circuit check:
(1) With ignition switch OFF, connect EGR coupler 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 W?
Fig. for STEP 4
ACTION YES
Stuck or faulty EGR
valve.
Clogged EGR gas
passage.
MAP sensor
malfunction.
If OK, substitute a
known-good ECM
(PCM) and recheck.
Fig. for STEP 5
ENGINE (H25 ENGINE) 6-1-97
NO
Faulty "Lg", "Lg/W",
"Lg/R", "Lg/Y" wire
or EGR valve.
1. EGR valve
2. Connector