Suzuki Wagon R Manual page 2935

6-2-36 ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE)
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2
E23
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1. ECM
2. ECM couplers (Viewed from harness side)
1
4
E22
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Inspection of ECM and Its Circuits
ECM and its circuits can be checked at ECM wiring couplers by
measuring voltage, pulse signal and resistance.
CAUTION:
ECM cannot be checked by itself. It is strictly prohibited
to connect voltmeter or ohmmeter to ECM with coupler
disconnected from it.
Voltage Check
1) Remove ECM (1) from vehicle body referring to "Engine
Control Module (ECM) Removal and Installation" in Section
6E2.
2) Check voltage and/or pulse signal at each terminal of cou-
plers (2) connected, using voltmeter (3) and oscilloscope (4).
NOTE:
• As each terminal voltage is affected by the battery volt-
age, confirm that it is 11 V or more when ignition
switch is turned ON.
• Voltage with asterisk(*) cannot be measured by voltme-
ter because it is pulse signal.
Check it with oscilloscope if necessary.
2
E21
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