DESCRIPTION
When the engine switch is turned on (IG), the battery voltage is applied to the IGSW terminal of the ECM. The output signal from the MREL terminal of the ECM causes a current to flow to the coil of the No. 1 integration relay (EFI relay), closing the contacts and supplying power to terminals +B and +B2 of the ECM.
WIRING DIAGRAM
INSPECTION PROCEDURE
Note
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
CHECK NO. 1 INTEGRATION RELAY (POWER SOURCE)
*1 | No. 1 Integration relay |
*a | Front view of wire harness connector (to No. 1 Integration Relay) |
Remove the No. 1 integration relay from the engine room relay block.
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 1 INTEGRATION RELAY - BATTERY) |
OK |
INSPECT NO. 1 INTEGRATION RELAY (EFI)
Inspect the No. 1 integration relay (EFI) Click here.
NG |
REPLACE NO. 1 INTEGRATION RELAY |
OK |
CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - ECM, BODY GROUND)
Check the harness and connectors between the No. 1 integration relay and ECM.
Remove the No. 1 integration relay from the engine room relay block.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Check the harness and connectors between the No. 1 integration relay and body ground.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
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 | ||||||
---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
INSPECT ECM (IGSW VOLTAGE)
*a | Front view of wire harness connector (to ECM) |
Disconnect the ECM connectors.
Turn the engine switch on (IG).
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
NG |
INSPECT NO. 1 INTEGRATION RELAY (IG2) Click here |
OK |
REPLACE ECM Click here
INSPECT NO. 1 INTEGRATION RELAY (IG2)
Inspect the No. 1 integration relay (IG2) Click here.
NG |
REPLACE NO. 1 INTEGRATION RELAY |
OK |
CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - ECM)
Remove the No. 1 integration relay from the engine room relay block.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Result | ||||||
---|---|---|---|---|---|---|
|
B |
CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - MAIN BODY ECU, BODY GROUND) Click here |
A |
REPAIR OR REPLACE HARNESS OR CONNECTOR
CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - MAIN BODY ECU, BODY GROUND)
Remove the No. 1 integration relay from the engine room relay block.
Disconnect the main body ECU connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
CHECK ENTRY AND START SYSTEM Click here