Diagnostic Procedure

WARNING: This page is about a different car, the 2008 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

CHECK CAN COMMUNICATION LINE
Perform the self-diagnosis. Refer to "SELF-DIAGNOSTIC RESULT MODE ".

Is any malfunction of the "U1000 CAN COMM CIRCUIT" indicated?

YES: Check CAN communication line. Refer to "DTC U1000 CAN COMMUNICATION LINE ".

No: GO TO 2.

CHECK INPUT SIGNALS

With CONSULT-III

Start engine.
Select "ECU INPUT SIGNALS" in "DATA MONITOR" mode for "TRANSMISSION" with CONSULT-III.

Start vehicle and read out the value of "SEC HYDR SEN" and "PRI HYDR SEN".

PRI AND SEC HYDR SEN DISPLAY VALUE

Item name	Condition	Display value (Approx.)
PRI HYDR SEN	"N" position idle	0.7 - 3.5 V
SEC HYDR SEN	"N" position idle	0.8 - 1.0 V

Without CONSULT-III

Start engine.

Check voltage between TCM connector terminals and ground.

TCM CONNECTOR TERMINALS AND GROUND

Name	Connector	Terminal	Condition	Voltage (Approx.)
Transmission fluid pressure sensor B (Primary pressure sensor)	F57	41 - Ground	"N" position idle	0.7 - 3.5 V
Transmission fluid pressure sensor A (Secondary pressure sensor)	F57	37 - Ground	"N" position idle	1.0 V

Fig 1: Checking Voltage Between TCM Connector Terminal And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 6.

NG: GO TO 3.

CHECK LINE PRESSURE
Perform line pressure test. Refer to "LINE PRESSURE TEST ".

Fig 2: Checking Line Pressure
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 4.

NG: Repair or replace damaged parts. Refer to "JUDGEMENT OF LINE PRESSURE TEST ".
CHECK TRANSMISSION FLUID PRESSURE SENSOR A (SECONDARY PRESSURE SENSOR) SYS-TEM AND TRANSMISSION FLUID PRESSURE SENSOR B (PRIMARY PRESSURE SENSOR) SYSTEM
Check transmission fluid pressure sensor A (secondary pressure sensor) system and transmission fluid pressure sensor B (primary pressure sensor) system. Refer to "DTC P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT (SEC PRESSURE SENSOR) ". "DTC P0845 TRANSMISSION FLUID PRESSURE SENSOR B CIRCUIT (PRI PRESSURE SENSOR) ".

OK or NG

OK: GO TO 5.

NG: Repair or replace damaged parts.
DETECT MALFUNCTIONING ITEM
Check the following:
- Line pressure solenoid valve. Refer to "COMPONENT INSPECTION ".
- Secondary pressure solenoid valve. Refer to "COMPONENT INSPECTION ".
- Step motor. Refer to "COMPONENT INSPECTION ".
OK or NG

OK: GO TO 6.

NG: Repair or replace damaged parts.
CHECK DTC
Perform "DTC Confirmation Procedure". Refer to "DTC CONFIRMATION PROCEDURE ".

OK or NG

OK: INSPECTION END

NG: Replace TCM or transaxle assembly. Refer to "REMOVAL AND INSTALLATION ".