Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2008AVALON V6-3.5L (2GR-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTTRANSMISSION CONTROL SYSTEMSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSECU POWER SOURCE CIRCUIT
2008 Toyota Avalon V6-3.5L (2GR-FE)
ECU Power Source Circuit
2008 Toyota Avalon V6-3.5L (2GR-FE)SECTION ECU Power Source Circuit
U660E AUTOMATIC TRANSAXLE: AUTOMATIC TRANSAXLE SYSTEM: ECU Power Source Circuit
ECU Power Source Circuit
DESCRIPTION
When the ignition switch is turned on (IG), voltage from the ECM's MREL terminal is applied to the EFI relay. This causes the contacts of the EFI relay to close, which supplies power to terminal +B of the TCM.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. INSPECT ECU TERMINAL VOLTAGE (+B TERMINAL)
(a) Disconnect the TCM connector.
(b) Turn the ignition switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:
Result:
B -- CHECK FOR INTERMITTENT PROBLEMS
A -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (TCM - BODY GROUND)
(a) Measure the resistance according to the value(s) in the table below.
Standard resistance:
(b) Reconnect the TCM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (TCM - BODY GROUND)
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (TCM - EFI RELAY)
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.