Lexus NX: PIG Power Supply Voltage (C1552,C1554)
DESCRIPTION
When a problem occurs in the power steering system, the power source relay circuit is shut off to stop the 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 inside ECU |
| On | Power switch on (IG) again | - |
| C1554 | Power Supply Relay Failure | Power source relay circuit malfunction |
| On | Power switch on (IG) again | - |
WIRING DIAGRAM
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CAUTION / NOTICE / HINT
NOTICE:
If the power steering ECU assembly has been replaced, perform assist map writing and torque sensor zero point calibration.
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HINT:
- When DTC C1551 is detected together with DTCs C1552 and C1554, inspect and repair the trouble areas indicated by DTC C1551 first.
- Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
| 1. | CHECK CONNECTOR CONNECTION CONDITION AND GROUND WIRE |
(a) Check the connection condition of the ECU wire sub-assembly and power steering ECU assembly connectors.
OK:
The ECU wire sub-assembly and power steering ECU assembly connectors are securely connected.
(b) Check that the ground wire is securely installed with the bolt.
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OK:
The ground wire is securely installed with the bolt.
| NG | .gif) | CONNECT CONNECTOR OR INSTALL GROUND WIRE |
|
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| 2. | READ VALUE USING TECHSTREAM (PIG POWER SUPPLY) |
(a) Turn the power switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the power switch on (IG).
(d) Turn the Techstream on.
(e) Enter the following menus: Chassis / EMPS / Data List.
(f) Select the item "PIG Power Supply" in the Data List and read the value displayed on the Techstream.
Chassis > EMPS > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| PIG Power Supply | Power source voltage to active motor | Min.: 0.0000 V Max.: 20.1531 V | Always: 9 to 16 V | - |
| Tester Display |
|---|
| PIG Power Supply |
OK:
The normal condition value is displayed on the Techstream.
| OK | | CHECK INTERMITTENT PROBLEMS |
|
| 3. | CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - ECU WIRE SUB-ASSEMBLY) |
| (a) Disconnect the An1 ECU wire sub-assembly connector. |
|
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(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| An1-1 (PIG) - Body ground | Always | 9 to 16 V |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 4. | CHECK ECU WIRE SUB-ASSEMBLY |
| (a) Connect the An1 connector to the ECU wire sub-assembly. |
|
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(b) Disconnect the n1 power steering ECU assembly connector.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| n1-1 (PIG) - Body ground | Always | 9 to 16 V |
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| n1-2 (PGND) - Body ground | Always | Below 1 Ω |
| OK | | REPLACE POWER STEERING ECU ASSEMBLY |
| NG | | REPAIR OR REPLACE ECU WIRE SUB-ASSEMBLY |
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