DESCRIPTION
When the engine switch is turned on (IG), the battery voltage is applied to the IGSW of the ECM. The output signal from the MREL terminal of the ECM causes a current to flow to the coil, closing the contacts of the integration relay (EFI MAIN NO. 1 relay) and supplying power to either terminal +B or +B2 of the ECM.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
Note
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
INSPECT NO. 2 INTEGRATION RELAY (POWER SOURCE)
*a | Front view of wire harness connector (to No. 2 integration relay) |
Disconnect the No. 2 integration relay connector.
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - NO. 2 INTEGRATION RELAY) |
OK |
CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY - BODY GROUND)
Disconnect the No. 2 integration relay connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
INSPECT NO. 2 INTEGRATION RELAY (IG2 MAIN, EFI MAIN NO. 1)
Inspect the No. 2 integration relay Click here.
NG |
REPLACE NO. 2 INTEGRATION RELAY |
OK |
CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY - ECM)
Disconnect the ECM connector.
Disconnect the No. 2 integration relay connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance (for RHD) | |||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Standard Resistance (for LHD) | |||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
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 (for RHD) | ||||||
---|---|---|---|---|---|---|
|
Standard Resistance (for LHD) | ||||||
---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
INSPECT ECM (IGSW VOLTAGE)
Disconnect the ECM connectors.
Turn the engine switch on (IG).
Measure the voltage according to the value(s) in the table below.
Standard Voltage (for RHD) | ||||||
---|---|---|---|---|---|---|
|
Standard Voltage (for LHD) | ||||||
---|---|---|---|---|---|---|
|
OK |
REPLACE ECM Click here |
NG |
CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY - ECM)
Disconnect the ECM connector.
Disconnect the No. 2 integration relay connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance (for RHD) | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Standard Resistance (for LHD) | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
CHECK HARNESS AND CONNECTOR (SMART KEY ECU ASSEMBLY - NO. 2 INTEGRATION RELAY)
Disconnect the smart key ECU assembly connector.
Disconnect the No. 2 integration relay connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
OK |
CHECK ENTRY AND START SYSTEM Click here |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |