Lexus ES: Crankshaft Position Sensor "A" No Signal (P033531)
DESCRIPTION
This DTC is output when a malfunction has occurred in the engine pulse signal system from the ECM.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| P033531 | Crankshaft Position Sensor "A" No Signal | Stereo component equalizer assembly detects malfunction in engine pulse signal system for 10 seconds or more continuously when engine speed is between 500 and 6000 rpm* |
|
HINT:
*: Malfunction monitoring is not performed under the following conditions, in order to prevent erroneous detection.
- After engine switch is turned on (ACC) for 3 seconds or more.
- After the battery voltage returns to normal for 3 seconds.
- Before 3 seconds have elapsed after battery voltage has returned to normal.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
When replacing the ECM.
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PROCEDURE
| 1. | CLEAR DTC |
(a) Clear the DTCs.
Body Electrical > Active Noise Control > Clear DTCs
|
| 2. | CHECK FOR DTC |
(a) Check for DTCs with all of the detection conditions met.
Body Electrical > Active Noise Control > Trouble CodesOK:
No DTCs are output.
| OK |  | USE SIMULATION METHOD TO CHECK |
|
| 3. | CHECK HARNESS AND CONNECTOR (STEREO COMPONENT EQUALIZER ASSEMBLY - ECM) |
(a) Disconnect the G15 stereo component equalizer assembly connector.
(b) Disconnect the A25 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| G15-3 (NEI) - A25-30 (NEO) | Always | Below 1 Ω |
| G15-3 (NEI) or A25-30 (NEO) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 4. | CHECK ECM |
(a) According to the table and using an oscilloscope, measure the waveform with the stereo component equalizer assembly connected.
| *a | Component with harness connected (Stereo Component Equalizer Assembly) | *b | Waveform |
| Item | Condition |
|---|---|
| Measurement terminal | G15-3 (NEI) - Body ground |
| Tool setting | 5 V/DIV., 20 ms./DIV. |
| Vehicle condition | Idling after warming up |
OK:
The waveform is similar to that shown in the illustration.
HINT:
The oscilloscope waveform shown in the illustration is an example for reference only. The waveform fluctuates according to engine speed.
| OK | | REPLACE STEREO COMPONENT EQUALIZER ASSEMBLY |
| NG | | GO TO SFI SYSTEM |
READ NEXT:
Parts Location
PARTS LOCATION ILLUSTRATION *1 ECM *2 INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - ECU-B NO. 2 FUSE - ECU-IG1 NO. 4 FUSE - ECU-ACC FUSE *3 DLC3 *4 STEREO COMPONENT EQUALIZER ASSEMBLY
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