POWER ASSIST SYSTEMS  POWER STEERING SYSTEM  C1553  PIG Power Supply Overvoltage  


DESCRIPTION

If the power steering ECU assembly determines that the motor power source voltage and the IG voltage are not within the specified range, it stops the power assist as a fail-safe function.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Return-to-normal Condition Note
C1553 PIG Power Supply Overvoltage
·

PIG power source overvoltage

·

IG power source overvoltage


·

IG and PIG power source circuits

·

Power steering ECU assembly


EPS warning light: Comes on After normal confirmation -

WIRING DIAGRAM

C290153
0.74,0.729 2.573,0.927 1.833,0.198 10 false from Battery 0.198,1.354 2.031,1.552 1.833,0.198 10 false from IG1 NO. 3 Relay 3.563,0.917 4.021,1.219 0.458,0.302 10 false EPS 3.313,1.563 4.448,1.823 1.135,0.26 10 false ECU-IG NO. 5 5.563,0.75 6.021,1.052 0.458,0.302 10 false A25 5.646,0.552 6.104,0.854 0.458,0.302 10 false 1 5.927,0.76 6.385,1.063 0.458,0.302 10 false PIG 5.938,1.385 6.396,1.688 0.458,0.302 10 false IG 5.563,1.385 6.021,1.688 0.458,0.302 10 false E40 5.646,1.198 6.104,1.5 0.458,0.302 10 false 1 5.563,2.042 6.021,2.344 0.458,0.302 10 false A25 5.646,1.854 6.104,2.156 0.458,0.302 10 false 2 5.938,2.052 6.396,2.354 0.458,0.302 10 false PGND 5.031,3.083 7,3.51 1.969,0.427 10 false Power Steering ECU Assembly

CAUTION / NOTICE / HINT

NOTICE:
·

If the power steering ECU assembly has been replaced, perform assist map writing and torque sensor zero point calibration.

Click hereSteering>POWER ASSIST SYSTEMS>POWER STEERING SYSTEM>CALIBRATION

·

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



PROCEDURE

1.CHECK HARNESS AND CONNECTOR (IG, PIG)
a.

Disconnect the E40 and A25 power steering ECU assembly connectors.


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
E40-1 (IG) - A25-2 (PGND) Ignition switch ON 8 to 16 V
A25-1 (PIG) - A25-2 (PGND) Always 9 to 16 V



Result:
Proceed to
OK
NG



OK

REPLACE POWER STEERING ECU ASSEMBLY

Click hereSteering>POWER ASSIST SYSTEMS>POWER STEERING ECU>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR