Grand Vitara 4WD L4-2.4L (2009)
Precautions for ECM Circuit Inspection See: Computers and Control Systems/Testing and Inspection/Initial Inspection and Diagnostic
Overview/Precautions For ECM Circuit Inspection
CAUTION: ECM and its circuits can be checked by measuring voltage and pulse signal with special tool connected. It is strictly prohibited to
connect voltmeter or ohmmeter to ECM with ECM connectors disconnected from it.
Voltage Check
1. Remove ECM (1) from its bracket.
2. Connect special tool between ECM and ECM connectors securely.
Special Tool
(A): 09933-06320
3. Check voltage and/or pulse signal using voltmeter (2) and oscilloscope (3).
NOTE:
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As each terminal voltage is affected by battery voltage, confirm that it is 11 V or more when ignition switch is turned to ON position.
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Voltage with asterisk (*) cannot be measured with voltmeter because it is pulse signal. Use oscilloscope for its check if necessary.
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Before performed this inspection, be sure to read Precautions for ECM Circuit Inspection. See: Computers and Control Systems/Testing
and Inspection/Initial Inspection and Diagnostic Overview/Precautions For ECM Circuit Inspection
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For identification of each cylinder, refer to Precautions for Identification of Cylinder.
