Lexus NX: Terminals Of Ecu
TERMINALS OF ECU
| *a | Component with harness connected (Power Steering ECU Assembly) | - | - |
CHECK POWER STEERING ECU ASSEMBLY
(a) Measure the voltage and resistance according to the value(s) in the table below.
NOTICE:
When the power steering warning light (red) is illuminated due to a malfunction, the fail-safe function may cause the voltage of the power steering ECU assembly terminals to become 0 V.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| n3-1 (IG) - n1-2 (PGND) | R - B | IG power source | Power switch on (IG) | 8 to 16 V |
| n3-4 (CANH) - n3-8 (CANL) | W - B | CAN communication line | Power switch off | 54 to 69 Ω |
| n3-5 (TS) - n1-2 (PGND) | O - B | Terminal TS of DLC3 | Always | 9 to 16 V |
| a-1 (TRQG) - Body ground | - (Not available) - Body ground | Torque sensor ground | Always | Below 1 Ω |
| a-2 (TRQ2) - a-1 (TRQG) | - (Not available) | Torque sensor signal | Power switch on (READY) Steering wheel not being turned (without load) | 2.3 to 2.7 V |
| Power switch on (READY) Steering wheel being turned to right with vehicle stopped | 0.3 to 2.5 V | |||
| Power switch on (READY) Steering wheel being turned to left with vehicle stopped | 2.5 to 4.7 V | |||
| a-3 (TRQV) - a-1 (TRQG) | - (Not available) | Torque sensor voltage source | Power switch on (READY) | 8.5 to 10.5 V |
| a-5 (TRQF) - a-1 (TRQG) | - (Not available) | Torque sensor reference voltage | Power switch on (READY) | 3.35 to 3.37 V |
| a-7 (TRQ1) - a-1 (TRQG) | - (Not available) | Torque sensor signal | Power switch on (READY) Steering wheel not being turned (without load) | 2.3 to 2.7 V |
| Power switch on (READY) Steering wheel being turned to right with vehicle stopped | 2.5 to 4.7 V | |||
| Power switch on (READY) Steering wheel being turned to left with vehicle stopped | 0.3 to 2.5 V | |||
| b-1 (RZCS2) - n1-2 (PGND) | B - B | Rotation angle sensor COS aspect output signal | Power switch on (READY) Steering wheel turned | 0.68 to 4.42 V |
| b-2 (RZV2) - n1-2 (PGND) | G - B | Rotation angle sensor excitation output signal | Power switch on (READY) Steering wheel turned | 0.68 to 4.42 V |
| b-3 (RZSN2) - n1-2 (PGND) | L - B | Rotation angle sensor SIN aspect output signal | Power switch on (READY) Steering wheel turned | 0.68 to 4.42 V |
| b-5 (RZCS1) - n1-2 (PGND) | R - B | Rotation angle sensor COS aspect output signal | Power switch on (READY) Steering wheel turned | 0.68 to 4.42 V |
| b-6 (RZV1) - n1-2 (PGND) | W - B | Rotation angle sensor excitation output signal | Power switch on (READY) Steering wheel turned | 0.68 to 4.42 V |
| b-7 (RZSN1) - n1-2 (PGND) | Y - B | Rotation angle sensor SIN aspect output signal | Power switch on (READY) Steering wheel turned | 0.68 to 4.42 V |
| n1-1 (PIG) - n1-2 (PGND) | R - B | Power source | Always | 9 to 16 V |
| n1-2 (PGND) - Body ground | B - Body ground | Power ground | Always | Below 1 Ω |
| c-1 (PHA) - n1-2 (PGND) | # - B | A phase motor output | Power switch on (READY) Steering wheel turned | Value changes within 4 to 35 V range |
| c-2 (PHB) - n1-2 (PGND) | # - B | B phase motor output | Power switch on (READY) Steering wheel turned | Value changes within 4 to 35 V range |
| c-3 (PHC) - n1-2 (PGND) | # - B | C phase motor output | Power switch on (READY) Steering wheel turned | Value changes within 4 to 35 V range |
HINT:
# means that the motor terminal is tightened directly to the ECU with bolts.
READ NEXT:
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Use the same procedure for the RH and LH sides.
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