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 |
READ NEXT:
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
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
SEE MORE:
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
The ECM is connected to the CAN communication system. Therefore, before starting troubleshooting, make sure to check that there are no malfunctions in the CAN communication system.
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
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Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART Lighting System DTC No. Detection Item DTC Output from Link B1244 Light Sensor Circuit Main Body B124B Automatic High Beam System Main Body B124C Automatic High Beam Camera Main Body B2410 Headlight Swivel ECU LH Com
