DESCRIPTION
When the engine switch is turned on (IG), voltage from the ECM's MREL terminal is applied to the EFI MAIN relay. This causes the contacts of the EFI MAIN relay to close, which supplies power to terminal +B of the TCM.
INSPECTION PROCEDURE
PROCEDURE
- Click here
CHECK HARNESS AND CONNECTOR (TCM - BODY GROUND)
-
Turn the engine switch off.
-
Disconnect the TCM connectors.
-
Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition D4-8 (E1) - Body ground Always Below 1 Ω
- OKClick here
- NGClick here
-
- Click here
INSPECT ECU TERMINAL VOLTAGE (+B TERMINAL)
-
Disconnect the TCM connectors.
-
Turn the engine switch on (IG).
-
Measure the voltage according to the value(s) in the table below.
Standard Voltage Tester Connection Switch Condition Specified Condition D4-18 (+B) - Body ground Engine switch on (IG) 11 to 14 V
- OKClick here
- NGClick here
-
- Click here
CHECK HARNESS AND CONNECTOR (TCM - EFI MAIN RELAY)
-
Turn the engine switch off.
-
Disconnect the TCM connector.
-
Remove the EFI MAIN relay from the engine room relay block.
-
Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open) Tester Connection Condition Specified Condition D4-18 (+B) - 3 Always Below 1 Ω Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D4-18 (+B) or 3 - Body ground Always 10 kΩ or higher
- OKClick here
- NGClick here
-
- Click here
REPAIR OR REPLACE HARNESS OR CONNECTOR
- Click here
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLEClick here
- Click here
REPAIR OR REPLACE HARNESS OR CONNECTOR
- Click here
GO TO ECM POWER SOURCE CIRCUIT (ENGINE CONTROL SYSTEM / SFI SYSTEM)Click here