DESCRIPTION
When the ignition switch is turned to ON, the battery voltage is applied to terminal IGSW of the ECM. The MREL output signal from ECM causes a current to flow to the coil, closing the contacts of the EFI MAIN relay and supplying power to terminal +B of the ECM.
WIRING DIAGRAM
INSPECTION PROCEDURE
Note
After replacing the ECM, the new ECM needs registration Click here and initialization Click here.
Inspect the fuses of circuits related to this system before performing the following inspection procedure.
PROCEDURE
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: | ||||||
---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
CHECK TERMINAL VOLTAGE (IGSW TERMINAL VOLTAGE)
*a | Front view of wire harness connector (to ECM) |
Disconnect the ECM connector.
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
NG |
INSPECT IGNITION SWITCH Click here |
OK |
INSPECT NO. 1 INTEGRATION RELAY (EFI MAIN RELAY)
Inspect the No. 1 integration relay (EFI MAIN relay) Click here.
NG |
REPLACE INTEGRATION NO. 1 RELAY (EFI MAIN RELAY) |
OK |
CHECK HARNESS AND CONNECTOR (EFI MAIN RELAY - ECM, EFI MAIN RELAY - BODY GROUND)
Check the harness and connector between the No. 1 integration relay (EFI MAIN relay) and ECM.
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 | |||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Reconnect the ECM connector.
Reinstall the No. 1 integration relay.
Check the harness and connector between the No. 1 integration relay (EFI MAIN relay) and body ground.
Remove the No. 1 integration relay from the No. 1 engine room relay block and junction block assembly.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Reinstall the No. 1 integration relay.
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - EFI MAIN RELAY)
INSPECT IGNITION SWITCH
Inspect the ignition switch Click here.
NG |
REPLACE IGNITION SWITCH Click here |
OK |
REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - IGNITION SWITCH, IGNITION SWITCH - ECM)