Lexus ES manuals

Lexus ES: PIG Power Supply Voltage (C1552,C1554)

DESCRIPTION

When a malfunction is detected in the PIG power source and power supply relay system, the fail-safe function suspends power assist.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Return-to-normal Condition

Note

C1552

PIG Power Supply Voltage

PIG power source circuit malfunction

  • EPS fuse
  • Harness or connector
  • Rack and pinion power steering gear assembly

EPS warning light: Comes on

Power switch is turned on (IG) again

-

C1554

Power Supply Relay Failure

Power source relay circuit malfunction

  • EPS fuse
  • Harness or connector
  • Rack and pinion power steering gear assembly

EPS warning light: Comes on

Power switch is turned on (IG) again

-

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

    Click here

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

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (RACK AND PINION POWER STEERING GEAR ASSEMBLY - BODY GROUND)

(a) Disconnect the C37 rack and pinion power steering gear assembly connector.

*a

Front view of wire harness connector (to Rack and Pinion Power Steering Gear Assembly)

-

-

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

C37-8 (PIG) - Body ground

Always

9 to 16 V

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C37-7 (PGND) - Body ground

Always

Below 1 Ω

OK

REPLACE RACK AND PINION POWER STEERING GEAR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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 Error in Matching of ECUs (C1567)

DESCRIPTION The power steering ECU (rack and pinion power steering gear assembly) determines whether an incompatible hybrid vehicle control ECU or skid control ECU (brake booster with master cylinder

 Assist Map Number Un-Writing (C1581)

DESCRIPTION This DTC will be stored if the power steering ECU (rack and pinion power steering gear assembly) determines that the assist map is not written in the ECU. DTC No. Detection Item DTC

 Assist Map Number Mismatch (C1582)

DESCRIPTION When an incorrect hybrid vehicle control ECU or skid control ECU (brake booster with master cylinder assembly) is installed after the assist map has been written to the power steering ECU

SEE MORE:

 Installation

INSTALLATION PROCEDURE 1. INSTALL FRONT ENGINE MOUNTING INSULATOR (a) Install the stay to the front engine mounting insulator with the nut. Torque: 6.0 N·m {61 kgf·cm, 53 in·lbf} (b) Install the front engine mounting insulator to the front frame assembly with the 3 nuts. Torque: 72 N·m {734 kg

 Reassembly

REASSEMBLY PROCEDURE 1. INSTALL NO. 2 RADIATOR GRILLE SEAL HINT: When installing the No. 2 radiator grille seal, heat the radiator shutter using a heat light. Heating Temperature Item Temperature Radiator Shutter 20 to 30°C (68 to 86°F) CAUTION: Do not touch the heat light and hea

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