RM3660EC _55 Steering _080761 POWER ASSIST SYSTEMS _0392052 POWER STEERING SYSTEM(for Gasoline Model) C

POWER ASSIST SYSTEMS POWER STEERING SYSTEM(for Gasoline Model) 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	Return-to-normal Condition	Note
C155A16	Power Steering Motor "A" Supply Voltage Circuit Voltage Below Threshold	Motor "1" PIG voltage is 3.6 V or less	· EPS fuse · PIG power source circuit · Power steering ECU assembly	EPS warning light: Comes on	Ignition switch ON again	-
C155A17	Power Steering Motor "A" Supply Voltage Circuit Voltage Above Threshold	Diagnosis Condition: IG ON Malfunction Status: 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	Ignition switch ON again	-
C155B16	Power Steering Motor "B" Supply Voltage Circuit Voltage Below Threshold	Motor "2" PIG voltage is 3.6 V or less	· EPS fuse · PIG power source circuit · Power steering ECU assembly	EPS warning light: Comes on	Ignition switch ON again	-
C155B17	Power Steering Motor "B" Supply Voltage Circuit Voltage Above Threshold	Diagnosis Condition: IG ON Malfunction Status: 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	Ignition switch ON again	-

WIRING DIAGRAM

5.583,2.875 6.906,3.25 1.323,0.375 10 false Power Steering ECU Assembly 2.01,0.708 3.729,1.083 1.719,0.375 10 false from 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 5.333,2.875 5.875,3.135 0.542,0.26 10 false I42

CAUTION / NOTICE / HINT

NOTICE:: 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)

Disconnect the I42 power steering ECU assembly connectors.

1.521,0.323 1.917,0.594 0.396,0.271 2.677,2.615 2.302,1.854 false 0.896,2.625 1.24,1.854 false 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)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
I42-1 (PIG) - Body ground	Always	9 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>REMOVAL202304,202502,_55,_080761,_0391587,RM100000002BCSS,202502,999999,_55,_080761,_0391587,RM100000002Q02C,

REPAIR OR REPLACE HARNESS OR CONNECTOR