Dtc P0725 Engine Speed Input Circuit. Corolla ZZE150

Трансмиссия. COROLLA, AURIS. ZZE150 ZRE151,152 NDE150
Механическая Трансмиссия 'Multimode' C53A. COROLLA, AURIS. ZZE150 ZRE151,152 NDE150

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0725)

INSPECT TCM

CHECK HARNESS AND CONNECTOR (TCM - ECM)

DTC P0725 Engine Speed Input Circuit


DESCRIPTION

The ECM detects the engine revolution signals (NE) using the crankshaft position (CKP) sensor. The TCM controls the transaxle in accordance with two engine revolution signals. One signal is received directly from the ECM through a serial communication line. The other signal is received from the ECM via the Controller Area Network (CAN) communication. If the TCM detects no engine revolution signals despite the engine revolution signal via CAN being received while the vehicle is running, the ECU interprets this as a malfunction in the engine revolution signal circuit. The ECU sets the DTC and illuminates the multi-mode manual transmission warning light.

DTC No.
DTC Detection Condition
Trouble Area
P0725
The TCM detects the following conditions simultaneously:
(1-trip detection logic)
  1. Engine speed is 400 rpm or less (serial communication circuit)
  2. Engine speed is 400 rpm or more (CAN communication circuit)
  3. Engine speed difference between signal from serial communication circuit and signal from CAN communication circuit is 400 rpm or more for 1.0 second
  1. Open or short in NE signal circuit
  2. TCM
  3. ECM

WIRING DIAGRAM


COROLLA, AURIS. ZZE150 ZRE151,152 NDE150.Механическая Трансмиссия 'Multimode' C53A.Система Механической Трансмиссии


INSPECTION PROCEDURE

ПРИМЕЧАНИЕ:
In ECM replacement, perform the REGISTRATION (Injector compensation codes) after installing the ECM (for 1ND-TV) (See page Нажмите здесь)
1.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0725)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG) and turn the tester ON.

  1. Select the following menu items: Powertrain / Multi-Mode M/T / DTC.

  1. Read DTCs and write them down.

  1. Select the following menu items: Powertrain / Engine and ECT.

  1. Read DTCs.

    Result:

    Result
    		Proceed to
    P0725
    		A
    P0725 and P0335
    		B
    Check the DTC output related to the engine revolution signal circuit in the engine control system and the multi-mode manual transaxle control system. If DTC P0335 is set together with DTC P0725, troubleshoot DTC P0335 first.


B
GO TO DTC CHART (Нажмите здесь)
A


2.INSPECT TCM

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG) and turn the tester ON.

  1. Select the following menu items: Powertrain / Multi-Mode M/T / Data List / Backup Engine Speed.

  1. Check the engine speed value displayed on the tester.

    Items
    [Abbreviation]
    		Measurement Items: Display
    		Normal Conditions
    		Diagnostic Notes
    Backup Engine Speed
    [Bacup Engin Spd]
    		Back-up engine speed:
    Min.: 0 rpm, Max.: 8,160 rpm
    		720 to 820 rpm: Idling
    0 rpm: Engine stopped
    		0 rpm displayed when malfunction in CAN communication


    COROLLA, AURIS. ZZE150 ZRE151,152 NDE150.Механическая Трансмиссия 'Multimode' C53A.Система Механической Трансмиссии

  1. Connect the oscilloscope probes to the NE terminal and the body ground.

  1. Check the signal waveform.

    Tester settings
    Items
    		Contents
    Terminals
    		CH1: NE (A34-10) - Body ground
    Equipment Settings
    		5 V/DIV., 5 ms./DIV.
    Condition
    		Engine idling
    OK:
    When the Backup Engine Speed indicates an idling speed on the intelligent tester, a waveform similar to that in the illustration is output.
    Result:
    Result
    		Proceed to
    NG
    		A
    OK
    		B


B
REPLACE TCM (Нажмите здесь)
A


3.CHECK HARNESS AND CONNECTOR (TCM - ECM)


    COROLLA, AURIS. ZZE150 ZRE151,152 NDE150.Механическая Трансмиссия 'Multimode' C53A.Система Механической Трансмиссии

  1. Disconnect the TCM connector.

  1. Disconnect the ECM connector.

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

    Standard resistance:
    Tester connection
    		Condition
    		Specified Condition
    A34-10 (NE) - A57-22 (NEO)
    		Always
    		Below 1 Ω
    A34-10 (NE) - Body ground
    		↑
    		10 kΩ or higher

  1. Reconnect the TCM connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (for 1ND-TV) (Нажмите здесь)