Lexus NX: Accumulator Pressure Sensor (C1365)
DESCRIPTION
The accumulator pressure sensor is built into the brake actuator (brake booster with master cylinder assembly).
The skid control ECU (brake booster with master cylinder assembly) detects the accumulator pressure from the data sent from the accumulator pressure sensor, and then starts and stops the pump motor by operating the motor relay.
This DTC may be stored if the accumulator pressure drops due to frequent braking (this is not a malfunction).
| DTC No. | Detection Item | INF Code | DTC Detection Condition | Trouble Area | Note |
|---|---|---|---|---|---|
| C1365 | Accumulator Pressure Sensor | 331 332 333 334 |
| Brake booster with master cylinder assembly | - |
CAUTION / NOTICE / HINT
NOTICE:
When replacing the skid control ECU (brake booster with master cylinder assembly) or brake actuator (brake booster with master cylinder assembly), perform initialization and calibration of the linear solenoid valve.
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PROCEDURE
| 1. | READ VALUE USING TECHSTREAM (ACCUMULATOR PRESSURE SENSOR) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Select the Data List on the Techstream.
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| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Accumulator Sensor | Accumulator pressure sensor | Min.: 0.00 V, Max.: 5.00 V | Specified value: 2.90 to 4.20 V | When brake fluid is stored in the accumulator: Accumulator pressure changes in accordance with volume of fluid stored in the accumulator |
| Tester Display |
|---|
| Accumulator Sensor |
(d) Depress the brake pedal 4 or 5 times to operate the pump motor.
(e) Wait for 30 seconds without depressing the brake pedal.
(f) Check that the accumulator pressure sensor output value change is within the specified range.
OK:
Accumulator pressure sensor output value change is less than 0.55 V.
| NG | .gif) | REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY |
|
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| 2. | RECONFIRM DTC |
(a) Turn the power switch off.
(b) Clear the DTCs.
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(c) Turn the power switch off.
(d) Perform a road test.
(e) Check if the same DTC is output.
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| Result | Proceed to |
|---|---|
| DTC C1365 is not output. | A |
| DTC C1365 is output. | B |
| A | | USE SIMULATION METHOD TO CHECK |
| B | | REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY |
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