DTC Code | DTC Name |
---|---|
P0725 | Engine Speed Input Circuit |
DESCRIPTION
The ECM detects the engine speed signals (NE) using the crankshaft position (CKP) sensor. The TCM controls the transaxle in accordance with two engine speed 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 speed signals despite the engine speed signal via CAN being received while the vehicle is being driven, the ECU interprets this as a malfunction in the engine speed signal circuit. The ECU stores this DTC and illuminates the multi-mode manual transaxle warning light.
DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate | Memory |
---|---|---|---|---|---|---|
P0725 | Engine Speed Input Circuit |
The TCM detects the following conditions simultaneously for 1 second: (1-trip detection logic)
|
|
Does not come on | Comes on | DTC stored |
WIRING DIAGRAM
PROCEDURE
CHECK ANY OTHER DTCS OUTPUT (ENGINE SPEED SIGNAL CIRCUIT)
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT.
Powertrain > Engine and ECT > Trouble CodesRead the DTCs.
Result | ||||||
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Check for DTCs related to the engine speed signal circuit in the engine control system. If DTC P0335 is output together with DTC P0725, troubleshoot DTC P0335 first.
B |
GO TO DTC P0335 Click hereНажмите здесь |
A |
INSPECT TCM
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Multi-Mode M/T / Data List / Backup Engine Speed.
According to the display on the GTS, read the Data List.
Powertrain > Multi-Mode M/T > Data ListTester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
---|---|---|---|---|
Backup Engine Speed | Back-up engine speed | Min.: 0 rpm, Max.: 8160 rpm | 720 to 820 rpm: Idling 0 rpm: Engine stopped | 0 rpm displayed when malfunction in CAN communication |
Tester Display |
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Backup Engine Speed |
Connect the oscilloscope probes to the NE terminal and the body ground.
*a |
Component with harness connected (TCM) |
Check the signal waveform.
Item | Condition |
---|---|
Terminals | NE - Body ground |
Tool setting | 5 V/DIV., 5 ms./DIV. |
Vehicle condition | Engine idling |
OK |
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When Backup Engine Speed indicates an idle speed, a waveform similar to that in the illustration is output. |
Result | |||
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NG | Нажмите здесь |
OK |
REPLACE TCM
Replace the TCM.
for LHD: Click here Нажмите здесь
for RHD: Click here Нажмите здесь
Result | ||
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NEXT |
PERFORM INITIALIZATION
Perform the initialization and learning procedure.
Click hereНажмите здесь
Result | ||
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NEXT |
END |
CHECK HARNESS AND CONNECTOR (TCM - ECM)
Disconnect the TCM connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
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Result | |||
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OK |
REPLACE ECM Click hereНажмите здесь |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |