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.
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- Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
| 1. | CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - RACK AND PINION POWER STEERING GEAR ASSEMBLY) |
(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 |
|---|---|---|
| C37-4 (IG) - Body ground | Power 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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Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT:
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspect
Hybrid/EV Powertrain Control Module Processor Watchdog / Safety MCU Failure (P060647,...,P1CE371)
DESCRIPTION The hybrid vehicle control ECU monitors its internal operation and will store these DTCs when it detects an internal malfunction. If these DTCs are output, replace the hybrid vehicle control ECU. DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicat
