Suzuki GA413, Service Manual

Page: 810 / 1246

INSPECTION OF ECM AND ITS CIRCUITS
ECM and its circuits can be checked at ECM wiring connectors by
measuring resistance.
CAUTION:
ECM cannot be checked by itself. It is strictly prohibited
to connect voltmeter or ohmmeter to ECM with connec-
tor disconnected from it.
RESISTANCE CHECK
1) Disconnect ECM couplers from ECM with ignition switch OFF.
2) Check resistance between each terminal of couplers discon-
nected, using a special tool.
Special Tool
(A): 09932-76010
CAUTION:
Never touch terminals of ECM itself or connect volt-
meter or ohmmeter.
Never insert tester probe from the wire harness side
of connector.
CAUTION:
Be sure to connect ohmmeter probe from wire ter-
minal side of coupler.
Be sure to turn OFF ignition switch for this check.
Resistance in table below represents that when
parts temperature is 20
C (68 F).
1. Connector
2. Probe
6-34 ENGINE GENERAL INFORMATION AND DIAGNOSIS
GA413
supple
TERMINALS CIRCUIT STANDARD RESISTANCE
C23-6 to L20-2/3 HO2S-1 heater (if equipped) 5 – 6.4
W
L20-1 to L20-17 HO2S-2 heater (if equipped) 11.7 – 14.3
W
C23-1 to L20-2/3 No.1 injector 10 – 15
W
C23-10 to L20-2/3 No.2 injector 10 – 15
W
C23-2 to L20-2/3 No.3 injector 10 – 15
W
C23-11 to L20-2/3 No.4 injector 10 – 15
W
C23-28 to L20-2/3 EGR valve (stepper motor coil 4) (if equipped) 20 – 24
W
C23-19 to L20-2/3 EGR valve (stepper motor coil 3) (if equipped) 20 – 24
W
C23-27 to L20-2/3 EGR valve (stepper motor coil 2) (if equipped) 20 – 24
W
C23-18 to L20-2/3 EGR valve (stepper motor coil 1) (if equipped) 20 – 24
W
C23-5 to L20-2/3 EVAP canister purge valve 30 – 34
W
L20-32 to L20-17 Fuel pump relay 56 – 146
W
C23-4 to L20-2/3 Fuel pressure control valve 37 – 44
W
L20-11 to L20-2/3 Radiator fan control relay 56 – 146
W
L20-8 to L20-12 Main relay 56 – 146
W
C23-17 to Body ground Ground Continuity
C23-8 to Body ground Ground Continuity
C23-9 to Body ground Ground Continuity