Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Crankshaft Position Sensor "A" No Signal (P033531)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Audio, Visual, Telematics / Audio / Video / Active Noise Control System / 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*
  • Harness or connector
  • SFI system
  • Stereo component equalizer assembly

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:

Refer to when replacing the ECM.

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Active Noise Control > Clear DTCs
NEXT

2.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Active Noise Control > Trouble Codes

OK:

DTC P033531 is not output.

OK

USE SIMULATION METHOD TO CHECK

NG

3.

CHECK HARNESS AND CONNECTOR (STEREO COMPONENT EQUALIZER ASSEMBLY - ECM)

(a) Disconnect the G68 stereo component equalizer assembly connector.

(b) Disconnect the A18 ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

G68-3 (NEI) - A18-30 (NEO)

Always

Below 1 Ω

G68-3 (NEI) or A18-30 (NEO) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

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

G68-3 (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

    Input / Output Signal Circuit

    Parts Location

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