Grand Vitara 4WD L4-2.4L (2009)
Circuit Description
When the ignition switch is turned to ON position, the main relay turns ON (the contact point closes) and the main power is supplied to ECM. And then
ECM supplies 5 V power to each sensor (A/C refrigerant pressure sensor, IMRC valve position sensor, EVAP leak check pressure sensor, APP sensor
and TP sensor).
Troubleshooting
NOTE:
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Before troubleshooting, perform following items.
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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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When measuring circuit voltage and/or pulse signal at ECM connector, connect special tool to ECM and ECM connectors.
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Be sure to confirm related fuses of ECM power circuit for not blown out. If fuse is blown out, replace fuse(s) and check circuits connected to
blown fuse(s) for short circuit to ground.
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Confirm that battery voltage is 12 V or more.
1. Check ECM power supply circuit as follows.
a. Turn OFF ignition switch and disconnect ECM connectors from ECM.
b. Check each terminal of ECM connectors for proper connection.
c. Measure voltage between each terminal of ECM connector and body ground in the following table.
If each measured voltage is out of specified voltage, repair or replace related part.
d. Turn OFF ignition switch and connect ECM connectors.
e. Measure voltage between each terminal of ECM connector and body ground in the following table.
