Diagnosis Procedure

WARNING: This page is about a different car, the 2009 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

CHECK INPUT SIGNAL

Start engine.
Check voltage between TCM connector terminal and ground.

TERMINAL VOLTAGE REFERENCE

TCM connector		Ground	Condition	Voltage (Approx.)
Connector	Terminal
F15	15		"N" position idle	1.0 - 1.5 V

Is the inspection result normal?

YES: GO TO 8.

NO: GO TO 2.

Fig 1: Checking Voltage Between TCM Connector Terminal 15 And Ground

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

CHECK POWER AND SENSOR GROUND

Check voltage between TCM terminals.

TERMINAL VOLTAGE REFERENCE

TCM connector			Voltage (Approx.)
Connector	Terminal		Voltage (Approx.)
F15	25	26	4.75 - 5.25 V

Is the inspection result normal?

YES: GO TO 3.

NO: GO TO 5.

Fig 2: Checking Voltage Between TCM Terminals

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

CHECK HARNESS BETWEEN TCM AND CVT UNIT [TRANSMISSION FLUID PRESSURE SENSOR A (SECONDARY PRESSURE SENSOR)] (PART 1)

Turn ignition switch OFF.
Disconnect TCM connector and CVT unit connector.
Check continuity between TCM vehicle side harness connector terminal and CVT unit vehicle side harness connector terminal.

TERMINAL CONTINUITY REFERENCE

TCM vehicle side harness connector		CVT unit vehicle side harness connector		Continuity
Connector	Terminal	Connector	Terminal	Continuity
F15 (A)	15	F46 (B)	23	Existed

Is the inspection result normal?

YES: GO TO 4.

NO: Repair or replace damaged parts.

Fig 3: Checking Continuity Between TCM And CVT Unit Vehicle Side Harness Connector Terminals

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

CHECK HARNESS BETWEEN TCM AND CVT UNIT [TRANSMISSION FLUID PRESSURE SENSOR A (SECONDARY PRESSURE SENSOR)] (PART 2)

Check continuity between TCM vehicle side harness connector terminal and ground.

TERMINAL CONTINUITY REFERENCE

TCM vehicle side harness connector		Ground	Continuity
Connector	Terminal
F15	15		Not existed

Is the inspection result normal?

YES: GO TO 7.

NO: Repair or replace damaged parts.

Fig 4: Checking Continuity Between TCM Vehicle Side Harness Connector Terminal 15 And Ground

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

CHECK HARNESS BETWEEN TCM AND CVT UNIT (SENSOR POWER AND SENSOR GROUND) (PART 1)

Turn ignition switch OFF.
Disconnect TCM connector and CVT unit connector.
Check continuity between TCM vehicle side harness connector terminals and CVT unit vehicle side harness connector terminals.

TERMINAL CONTINUITY REFERENCE

TCM vehicle side harness connector		CVT unit vehicle side harness connector		Continuity
Connector	Terminal	Connector	Terminal	Continuity
F15 (A)	25	F46 (B)	19	Existed
F15 (A)	26	F46 (B)	20	Existed

Is the inspection result normal?

YES: GO TO 6.

Fig 5: Checking Continuity Between TCM And CVT Unit Vehicle Side Harness Connector Terminals

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

NO: Repair or replace damaged parts.

CHECK HARNESS BETWEEN TCM AND CVT UNIT (SENSOR POWER AND SENSOR GROUND) (PART 2)

Check continuity between TCM vehicle side harness connector terminals and ground.

TERMINAL CONTINUITY REFERENCE

TCM vehicle side harness connector		Ground	Continuity
Connector	Terminal
F15	25		Not existed
	26

Is the inspection result normal?

YES: GO TO 7.

NO: Repair or replace damaged parts.

CHECK TCM
1. Replace with the same type of TCM. Refer to "EXPLODED VIEW ".
2. Connect each connector.
3. Perform "DTC CONFIRMATION PROCEDURE". Refer to "DTC LOGIC ".
Is "P0840 TR PRS SENS/A CIRC" detected?

YES: Replace transaxle assembly. Refer to "EXPLODED VIEW ".

NO: Replace TCM. Refer to "EXPLODED VIEW ".
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 "EXPLODED VIEW ".

NO: Repair or replace damaged parts.

Fig 6: Checking Continuity Between TCM Vehicle Side Harness Connector Terminals And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.