RM38T0EC _55 Steering _112287 POWER ASSIST SYSTEMS _0510880 POWER STEERING SYSTEM C

POWER ASSIST SYSTEMS POWER STEERING SYSTEM C155A16 Power Steering Motor "A" Supply Voltage Circuit Voltage Below Threshold C155A17 Power Steering Motor "A" Supply Voltage Circuit Voltage Above Threshold C155B16 Power Steering Motor "B" Supply Voltage Circuit Voltage Below Threshold C155B17 Power Steering Motor "B" Supply Voltage Circuit Voltage Above Threshold

DESCRIPTION

If a problem occurs in the system, the power source relay circuit and the motor relay circuit are shut off to stop power assist. The ECU must be replaced when there is a problem with the relays because the relays are built into the ECU.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate
C155A16	Power Steering Motor "A" Supply Voltage Circuit Voltage Below Threshold	Motor "A" PIG voltage is 3.5 V or less	· EPS fuse · PIG power source circuit · Power steering ECU assembly	EPS warning light: Comes on
C155A17	Power Steering Motor "A" Supply Voltage Circuit Voltage Above Threshold	Motor "1" PIG voltage is 19.6 V or more	· EPS fuse · PIG power source circuit · Power steering ECU assembly	EPS warning light: Comes on
C155B16	Power Steering Motor "B" Supply Voltage Circuit Voltage Below Threshold	Motor "B" PIG voltage is 3.5 V or less	· EPS fuse · PIG power source circuit · Power steering ECU assembly	EPS warning light: Comes on
C155B17	Power Steering Motor "B" Supply Voltage Circuit Voltage Above Threshold	Motor "2" PIG voltage is 19.6 V or more	· EPS fuse · PIG power source circuit · Power steering ECU assembly	EPS warning light: Comes on

WIRING DIAGRAM

5.479,2.958 6.771,3.375 1.292,0.417 10 false Power Steering ECU Assembly 1.458,0.708 3.177,1.083 1.719,0.375 10 false from Auxiliary Battery 3.833,0.896 4.375,1.156 0.542,0.26 10 false EPS 5.677,0.74 6.219,1 0.542,0.26 10 false PIG 5.677,1.906 6.219,2.167 0.542,0.26 10 false PGND 5.51,0.625 6.052,0.885 0.542,0.26 10 false 1 5.5,1.792 6.042,2.052 0.542,0.26 10 false 2 5.479,2.792 6.021,3.052 0.542,0.26 10 false I42

CAUTION / NOTICE / HINT

NOTICE:: ·

When the power steering ECU assembly has been replaced, perform Power Steering ECU Initial Setting (assist map writing).

Click hereSteering>POWER ASSIST SYSTEMS>POWER STEERING SYSTEM>CALIBRATION202201,999999,_55,_112287,_0510880,RM1000000020BL6,

·

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - BODY GROUND)

1.521,0.323 1.917,0.594 0.396,0.271 2.677,2.615 2.302,1.854 true 0.896,2.625 1.24,1.854 true 0.229,0.177 0.542,0.375 0.313,0.198 10 false *a 1.625,0.375 2.135,0.688 0.51,0.313 10 false I42 2.531,2.667 3.063,2.865 0.531,0.198 10 false PGND 0.802,2.667 1.333,2.865 0.531,0.198 10 false PIG

*a	Front view of wire harness connector (to Power Steering ECU Assembly)

Disconnect the I42 power steering ECU assembly connectors.

Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
I42-1 (PIG) - Body ground	Always	8 to 16 V

Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
I42-2 (PGND) - Body ground	Always	Below 1 Ω

Result:

Proceed to
OK
NG

REPLACE POWER STEERING ECU ASSEMBLY

Click hereSteering>POWER ASSIST SYSTEMS>POWER STEERING ECU>REMOVAL202307,999999,_55,_112287,_0500993,RM100000002C2X1,

REPAIR OR REPLACE HARNESS OR CONNECTOR