DESCRIPTION
When the engine switch is turned on (IG), battery voltage is applied to the IGSW terminal of the ECM. The output signal from the MREL terminal of the ECM causes current to flow to the coil of the semiconductor pwr integration ECU (EFI-MAIN relay), closing the contact and supplying power to terminals +B and +B2 of the ECM.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
Note
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
INSPECT SEMICONDUCTOR POWER INTEGRATION ECU (POWER SOURCE)
*a | Front view of wire harness connector (to Semiconductor Pwr Integration ECU) |
Disconnect the semiconductor pwr integration ECU connector.
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
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Result | |||
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NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - SEMICONDUCTOR PWR INTEGRATION ECU) |
OK |
CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - BODY GROUND)
Disconnect the semiconductor pwr integration ECU connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
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Result | |||
---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
INSPECT SEMICONDUCTOR POWER INTEGRATION ECU (EFI-MAIN, IG2 RELAY)
Inspect the semiconductor pwr integration ECU (EFI-MAIN, IG2 relay).
Result | |||
---|---|---|---|
|
NG |
REPLACE SEMICONDUCTOR POWER INTEGRATION ECU Click here |
OK |
CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - ECM)
Disconnect the semiconductor pwr integration ECU connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
INSPECT ECM (IGSW VOLTAGE)
*a | Component with harness connected (ECM) |
Turn the engine switch on (IG).
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
OK |
REPLACE ECM Click here |
NG |
CHECK HARNESS AND CONNECTOR (ECM - SEMICONDUCTOR PWR INTEGRATION ECU)
Disconnect the semiconductor pwr integration ECU connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - SEMICONDUCTOR PWR INTEGRATION ECU)
Disconnect the semiconductor pwr integration ECU connector.
Disconnect the certification ECU (smart key ECU assembly) connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
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|
Result | |||
---|---|---|---|
|
OK |
GO TO ENTRY AND START SYSTEM Click here |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |