TERMINALS OF ECU
1. CHECK POWER STEERING ECU
HINT:
As connector z8 uses a lock lever, each terminal cannot be checked while the connector is still connected to the power steering ECU.
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
---|---|---|
z8-1 (V) |
W |
V phase motor output |
z8-2 (U) |
B |
U phase motor output |
z8-3 (W) |
R |
W phase motor output |
(a) Measure the voltage and resistance according to the value(s) in the table below.
NOTICE:
When the P/S warning light is illuminated during a malfunction, the fail-safe function may cause the voltage of the power steering ECU terminals to become 0 V.
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|---|
D19-1 (PIG) - D19-2 (PGND) |
R - B |
Power source |
Always |
11 to 14 V |
D19-2 (PGND) - Body ground |
B - Body ground |
Power ground |
Always |
Below 1 Ω |
D20-1 (CANH) - D20-7 (CANL) |
BR - W |
CAN communication line |
Ignition switch off |
54 to 69 Ω |
D20-6 (IG) - D19-2 (PGND) |
GR - B |
IG power source |
Ignition switch ON |
11 to 14 V |
z9-1 (RZV) - D19-2 (PGND) |
R - B |
Rotation angle sensor excitation output signal |
Engine running, steering wheel being turned |
-2.42 to 2.42 V |
z9-3 (RZG) - D19-2 (PGND) |
B - B |
Rotation angle sensor excitation circuit GND |
Always |
Below 1 Ω |
z9-5 (RZCS) - D19-2 (PGND) |
L - B |
Rotation angle sensor COS aspect output signal |
Engine running, steering wheel being turned |
-0.73 to 0.73 V |
z9-6 (RZSN) - D19-2 (PGND) |
Y - B |
Rotation angle sensor SIN aspect output signal |
Engine running, steering wheel being turned |
-0.73 to 0.73 V |
z10-5 (TRQ1) - z10-8 (TRQG) |
W - B |
Torque sensor signal |
Engine running, steering wheel not turned (without load) |
2.3 to 2.7 V |
Engine running, steering wheel turned to right with vehicle stopped |
2.5 to 3.8 V |
|||
Engine running, steering wheel turned to left with vehicle stopped |
1.2 to 2.5 V |
|||
z10-6 (TRQV) - z10-8 (TRQG) |
R - B |
Torque sensor voltage source |
Ignition switch ON |
4.5 to 5.5 V |
z10-7 (TRQ2) - z10-8 (TRQG) |
Y - B |
Torque sensor signal |
Engine running, steering wheel not turned (without load) |
2.3 to 2.7 V |
Engine running, steering wheel turned to right with vehicle stopped |
1.2 to 2.5 V |
|||
Engine running, steering wheel turned to left with vehicle stopped |
2.5 to 3.8 V |
|||
z10-8 (TRQG) - Body ground |
B - Body ground |
Torque sensor ground |
Always |
Below 1 Ω |
If the result is not as specified, the ECU may have a malfunction.
Removal
REMOVAL
PROCEDURE
1. REMOVE REAR WHEELS
2. SEPARATE REAR STABILIZER LINK ASSEMBLY LH
(a) Remove the nut and separate the rear stabilizer link assembly LH
from the rear stabilizer bar.
Text in Illustration
*1
...
Short to GND in Immobiliser System Power Source Circuit (B278A)
DESCRIPTION
This DTC is stored when the engine switch power source supply line is open or
shorted.
DTC No.
DTC Detection Condition
Trouble Area
B278A
Engine switch power source supply line is ope ...
Installation
INSTALLATION
CAUTION / NOTICE / HINT
NOTICE:
When disconnecting the steering intermediate shaft assembly and pinion shaft
of the steering gear assembly, be sure to place matchmarks before servicing.
PROCEDURE
1. INSTALL TIE ROD ASSEMBLY LH
( ...