Suzuki GA413 Service Manual page 458

6E-48 ENGINE AND EMISSION CONTROL SYSTEM
TABLE B-6 EGR SYSTEM CHECK (IF EQUIPPED)
WIRING DIAGRAM
SYSTEM DESCRIPTION
When EGR valve stepper motor receives open (close) signal from ECM, it turns in the open (close) direction accord-
ing to the number of steps and pushes out (pulls up) the rod which is in mesh with the worm of the stepper motor.
As the rod installed to the EGR valve opens by the amount corresponding to the number of steps of signal from
ECM to let the exhaust gas flow from the exhaust manifold to the intake manifold.
INSPECTION
STEP
1 Did you perform "ENGINE DIAGNOSTIC FLOW
TABLE" in Section 6?
2 1) Perform "EGR Valve On-vehicle Inspection"
and "EGR Valve Inspection" in this section.
Is EGR valve in good condition?
3 1) Install EGR valve and connect EGR valve con-
nector.
2) With ignition switch OFF position, disconnect
ECM connectors.
3) Measure resistance from "A1" to "B18", "B19",
"B27" and "B28" of ECM connectors.
Is each resistance within 20-24W at 205C (685F)?
ACTION YES
Go to Step 2.
Go to Step 3.
Restricted EGR pas-
sage.
Poor connection of ECM
connector.
If OK, substitute a
known-good ECM and
recheck.
1. EGR valve
2. EGR valve connector
3. Power supply from main relay
4. ECM connector (A)
5. ECM connector (B)
6. ECM
NO
Go to "ENGINE DIAG-
NOSTIC FLOW TABLE".
Faulty EGR valve.
Faulty "B/R", "R/B",
"R/Y", "R", "R/Bl" wire.
Poor connection of EGR
valve connector.