DESCRIPTION
When the power switch is turned on (IG), the auxiliary battery voltage is applied to terminal IGSW of the ECM. The ECM MREL output signal causes a current to flow to the coil, closing the contacts of the No. 1 integration relay (EFI MAIN1 relay) and supplying power to terminal +B and +B2 of the ECM.
If the power switch is turned off, the ECM holds the No. 1 integration relay (EFI MAIN1 relay) ON for a maximum of 2 seconds to allow for the initial setting of the throttle valve.
When the power switch is turned on (IG), voltage from the ECM's MREL terminal is applied to the No. 1 integration relay (EFI MAIN1 relay). This causes the contacts of the No. 1 integration relay (EFI MAIN1 relay) to close, which supplies power to terminal +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 inspection procedure.
PROCEDURE
CHECK NO. 1 INTEGRATION RELAY (POWER SOURCE)
*a | Front view of wire harness connector (to No. 1 Integration Relay) |
Remove the No. 1 integration relay from the No. 1 engine room relay block and junction block assembly.
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
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|
Reinstall the No. 1 integration relay.
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - NO. 1 INTEGRATION RELAY) |
OK |
INSPECT NO. 1 INTEGRATION RELAY (EFI MAIN1 RELAY, IG2 RELAY)
Inspect the No. 1 integration relay Click here.
NG |
REPLACE NO. 1 INTEGRATION RELAY |
OK |
CHECK HARNESS AND CONNECTOR (EFI MAIN1 RELAY - ECM, BODY GROUND)
Remove the No. 1 integration relay from the No. 1 engine room relay block and junction block assembly.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Reinstall the No. 1 integration relay.
Reconnect the ECM connector.
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 | ||||||
---|---|---|---|---|---|---|
|
Reconnect the ECM connector.
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
INSPECT ECM (IGSW VOLTAGE)
Disconnect the ECM connector.
Turn the power switch on (IG).
*a | Front view of wire harness connector (to ECM) |
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
OK |
REPLACE ECM Click here |
NG |
GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START Click here |