Nissan Altima (L32) 2007-2012 Service Manual: P0725 engine speed signal
Description
The engine speed signal is sent from the ECM to the TCM by CAN communication line.
DTC Logic
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION: Always drive vehicle at a safe speed.
NOTE: If “DTC CONFIRMATION PROCEDURE” has been previously performed, always turn ignition switch OFF.
Then wait at least 10 seconds before performing the next test.
1.CHECK DTC DETECTION
1. Turn ignition switch ON.
2. Select “DATA MONITOR”.
3. Start engine and maintain the following conditions for at least 10 consecutive seconds.
PRI SPEED SEN : More than 1000 rpm
Is “P0725 ENGINE SPEED SIG” detected? YES >> Go to TM-142, "Diagnosis Procedure".
NO >> Check intermittent incident. Refer to GI-42, "Intermittent Incident".
Diagnosis Procedure
1.CHECK DTC WITH ECM
1. Turn ignition switch ON.
2. Perform “SELF-DIAG RESULTS” mode for “ENGINE”.
Is the inspection result normal? YES >> GO TO 2.
NO >> Check DTC detected item. Refer to EC-1555, "DTC Index".
2.CHECK DTC WITH TCM
Perform “SELF-DIAG RESULTS” mode for “TRANSMISSION”.
Is “P0725 ENGINE SPEED SIG” detected? YES >> Replace TCM. Refer to TM-254, "Exploded View".
NO >> GO TO 3.
3.DETECT MALFUNCTIONING ITEMS
Check TCM connector pin terminals for damage or loose connection with harness connector.
Is the inspection result normal? YES >> Replace TCM. Refer to TM-254, "Exploded View".
NO >> Repair or replace damaged parts.
P0720 vehicle speed sensor cvt (secondary
speed sensor)
Description
The vehicle speed sensor CVT [output speed sensor (secondary speed sensor)]
detects the revolution of the
CVT output shaft and emits a pulse signal. The pulse signal is sent to the TCM ...
P0730 belt damage
Description
TCM selects the gear ratio using the engine load (throttle position), the
primary pulley revolution speed, and
the secondary pulley revolution speed as input signal. Then it changes t ...
Other materials:
If your vehicle is stolen
If your vehicle is stolen, you should change the
codes of any non-rolling code device that has
been programmed into HomeLink®. Consult the
Owner’s Manual of each device or call the manufacturer
or dealer of those devices for additional
information.
When your vehicle is recovered, you will
...
Can communication
System Description
CAN (Controller Area Network) is a serial communication line for real time
application. It is an on-vehicle multiplex
communication line with high data communication speed and excellent error
detection ability. Many electronic
control units are equipped onto a vehicle, and ...
Precaution
Supplemental Restraint System SRS "AIR BAG"
and "SEAT BELT PRE-TENSIONER" Service
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”,
used along
with a front seat belt, helps to reduce the risk or severity of injury to the
driver and ...
