Lexus ES: IG Power Supply Voltage (C1551)
DESCRIPTION
When a malfunction is detected in the power source circuit, the fail-safe function suspends power assist.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Warning Indicate | Return-to-normal Condition | Note |
|---|---|---|---|---|---|---|
| C1551 | IG Power Supply Voltage | When the PIG power supply voltage is normal, the IG power supply voltage is 18.5 V or higher |
| EPS warning light: Comes on | The ECU judges the system has returned to normal | - |
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
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- Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
| 1. | CHECK HARNESS AND CONNECTOR (BATTERY - RACK AND PINION POWER STEERING GEAR ASSEMBLY) |
(a) Disconnect the C37 rack and pinion power steering gear assembly connector.
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| *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 |
|---|---|---|
| C37-4 (IG) - Body ground | Engine switch on (IG) | Below 18.5 V |
| NG | .gif) | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
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| 2. | CHECK FOR DTC |
(a) Clear the DTCs.
Chassis > EMPS > Clear DTCs(b) Check for DTCs.
Chassis > EMPS > Trouble Codes| Result | Proceed to |
|---|---|
| DTC is output. | A |
| DTC is not output. | B |
| A | | REPLACE RACK AND PINION POWER STEERING GEAR ASSEMBLY |
| B | | USE SIMULATION METHOD TO CHECK |
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Terminals Of Ecu
TERMINALS OF ECU Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition G128-1 (+B) - G128-20 (E) BR - W-B Power source (+B) Always 11 to 14 V G128-3 (SIG-) - G128-20 (E) B - W-B Ground Always Below 1 V G128-4 (IND1) - G128-20 (E
