ecm NISSAN VERSA 2006 Workshop Service User Guide

AT-104
DTC P0710 A/T FLUID TEMPERATURE SENSOR CIRCUIT
Revision: June 20062007 Versa
TCM terminal data are reference values, measured between each terminal and ground.
Diagnostic ProcedureUCS005NS
1. CHECK INPUT SIGNAL
With CONSULT-II
1. Start engine.
2. Select “TCM INPUT SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Read out the value of “FLUID TEMP SE”.
Without CONSULT-II
1. Start engine.
2. Check voltage TCM connector terminals while warming up A/T.
OK or NG
OK >> GO TO 7.
NG >> GO TO 2.
2. DETECT MALFUNCTIONING ITEMS
Check the following.

Harness for short or open between TCM, ECM and terminal cord assembly

Ground circuit for ECM, Refer to EC-144, "POWER SUPPLY AND GROUND CIRCUIT" .
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
Terminal Wire color Item ConditionJudgement stan-
dard (Approx.)
42 B Sensor ground Always 0 V
47 BRA/T fluid temperature
sensor
and When A/T fluid temperature is
20°C (68°F).1.5 V
When A/T fluid temperature is
80°C (176°F).0.5 V
Item name ConditionDisplay value
(Approx.)
FLUID TEMP
SEWhen A/T fluid temperature is 20°C (68°F). 1.5 V
When A/T fluid temperature is 80°C (176°F). 0.5 V
LCIA0090E
ItemConnec-
torTerminal ConditionJudge-
ment stan-
dard
(Approx.)
A/T fluid
temperature
sensorE32 47 - 42When A/T fluid tempera-
ture is 20°C (68°F).1.5 V
When A/T fluid tempera-
ture is 80°C (176°F).0.5 V
SCIA2658E

DTC P0725 ENGINE SPEED SIGNAL
AT-113
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Revision: June 20062007 Versa
DTC P0725 ENGINE SPEED SIGNALPFP:24825
DescriptionUCS005O1
The engine speed signal is sent from the ECM to the TCM.
CONSULT-II Reference ValueUCS005O2
Remarks: Specification data are reference values.
On Board Diagnosis LogicUCS005O3

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “P0725 ENGINE SPEED SIG” with CONSULT-II or 9th judgement flicker without
CONSULT-II is detected when TCM does not receive the proper voltage signal from ECM.
Possible CauseUCS005O4
Harness or connector
(Circuit is open or shorted.)
DTC Confirmation ProcedureUCS005O5
CAUTION:

Always drive vehicle at a safe speed.

If performing this “DTC Confirmation Procedure” again, always turn ignition switch OFF and wait
at least 10 seconds before continuing.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1. Turn ignition switch ON and select “DATA MONITOR” mode for
“A/T” with CONSULT-II.
2. Touch “START”.
3. Start engine and maintain the following conditions for at least 10
consecutive seconds.
VEHICLE SPEED: 10 km/h (6 MPH) or more
THROTTLE POSI: More than 1.0/8
SLCT LVR POSI: “D” position
4. If the check result is NG, go to AT- 11 5 , "
Diagnostic Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-II”.
WITHOUT CONSULT-II
1. Start engine.
2. Drive vehicle under the following conditions for more than 10 seconds.
Selector lever position: “D” position
Vehicle speed: Higher than 10 km/h (6 MPH)
Throttle position: Greater than 1.0/8 of the full throttle position
3. Perform self-diagnosis. Refer to AT- 9 0 , "
Diagnostic Procedure Without CONSULT-II" .
4. If the check result is NG, go to AT- 11 5 , "
Diagnostic Procedure" .
Item name Condition Display value
ENGINE SPEED Engine running Approximately matches the tachometer reading.
BCIA0031E

DTC P0725 ENGINE SPEED SIGNAL
AT-115
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AT
Revision: June 20062007 Versa
TCM terminal data are reference values, measured between each terminal and ground.
Diagnostic ProcedureUCS005O7
1. CHECK DTC WITH ECM
Check DTC with CONSULT-II “ENGINE”.
Turn ignition switch ON and select “SELF-DIAGNOSTIC RESULTS” mode for “ENGINE” with CONSULT-II.
Refer to EC-113, "
CONSULT-II Function (ENGINE)" .
OK or NG
OK >> GO TO 2.
NG >> Check ignition signal circuit for engine control. Refer to EC-576, "
IGNITION SIGNAL" .
2. CHECK INPUT SIGNAL
With CONSULT-II
1. Start engine.
2. Select “TCM INPUT SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Read out the value of “ENGINE SPEED”. Check engine speed
changes according to throttle position.
Without CONSULT-II
1. Start engine.
2. Check voltage between TCM harness connector terminal and
ground.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
Terminal Wire color Item Condition Judgement standard (Approx.)
39 L Engine speed signal
and Refer to EC-105
.
Item name Condition Display value
ENGINE SPEED Engine runningApproximately matches the tachome-
ter reading.
SCIA4730E
itemConnec-
torTerminal ConditionJudgement standard
(Approx.)
Engine
speed signalE3239 -
Ground
and Refer to EC-105
.
SCIA3265E

AT-116
DTC P0725 ENGINE SPEED SIGNAL
Revision: June 20062007 Versa
3. CHECK HARNESS BETWEEN TCM AND ECM
1. Turn ignition switch OFF.
2. Disconnect ECM connector and TCM connector.
3. Check continuity between ECM connector and TCM connector.
4. If OK, check harness for short to ground and short to power.
5. If OK, check continuity between body ground and transaxle
assembly.
6. Reinstall any part removed.
OK or NG
OK >> GO TO 4.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK DTC
Perform AT-113, "
DTC Confirmation Procedure" .
OK or NG
OK >>INSPECTION END
NG >> GO TO 5.
5. CHECK TCM
1. Check TCM input/output signal. Refer to AT - 7 8 , "
TCM Terminals and Reference Value" .
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK >>INSPECTION END
NG >> Repair or replace damaged parts.
Item Connector Terminal Continuity
TCM E32 39
Ye s
ECM F10 13
SCIA7173E

DTC P0731 A/T 1ST GEAR FUNCTION
AT-117
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Revision: June 20062007 Versa
DTC P0731 A/T 1ST GEAR FUNCTIONPFP:31940
DescriptionUCS005O8

This malfunction will not be detected while the OD OFF indicator lamp is indicating another self-diagnosis
malfunction.

This malfunction is detected when the A/T does not shift into first gear position as instructed by the TCM.
This is not caused by electrical malfunction (circuits open or shorted) but by mechanical malfunction such
as control valve sticking, improper solenoid valve operation, etc.
On Board Diagnosis LogicUCS005O9

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “P0731 A/T 1ST GR FNCTN” with CONSULT-II is detected when A/T cannot be
shifted to the 1st gear position even if electrical circuit is good.

This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by TCM
as follows:
Torque converter slip ratio = A x C/B
A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from ECM
C: Gear ratio determined as gear position which TCM supposes
If the actual gear position is higher than the position (1st) supposed by TCM, the slip ratio will be more
than normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.
This malfunction will be caused when either shift solenoid valve A is stuck open or shift solenoid valve B is
stuck open.

Gear positions supposed by TCM are as follows:
In case of gear position with no malfunctions: 1 , 2, 3 and 4 positions
In case of gear position with shift solenoid valve A stuck open: 2* , 2, 3 and 3 positions
In case of gear position with shift solenoid valve B stuck open: 4* , 3, 3 and 4 positions to each gear posi-
tion above
*: “P0731 A/T 1ST GR FNCTN” is detected.
Possible CauseUCS005O A

Shift solenoid valve A

Shift solenoid valve B

Each clutch

Hydraulic control circuit
Gear position 1 2 3 4
Shift solenoid valve A ON (Closed) OFF (Open) OFF (Open) ON (Closed)
Shift solenoid valve B ON (Closed) ON (Closed) OFF (Open) OFF (Open)

DTC P0732 A/T 2ND GEAR FUNCTION
AT-121
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Revision: June 20062007 Versa
DTC P0732 A/T 2ND GEAR FUNCTIONPFP:31940
DescriptionUCS005O D

This malfunction will not be detected while the OD OFF indicator lamp is indicating another self-diagnosis
malfunction.

This malfunction is detected when the A/T does not shift into second gear position as instructed by the
TCM. This is not caused by electrical malfunction (circuits open or shorted) but by mechanical malfunction
such as control valve sticking, improper solenoid valve operation, etc.
On Board Diagnosis LogicUCS005O E

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “P0732 A/T 2ND GR FNCTN” with CONSULT-II is detected when A/T cannot be
shifted to the 2nd gear position even if electrical circuit is good.

This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by TCM
as follows:
Torque converter slip ratio = A x C/B
A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from ECM
C: Gear ratio determined as gear position which TCM supposes
If the actual gear position is higher than the position (2nd) supposed by TCM, the slip ratio will be more
than normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.
This malfunction will be caused when shift solenoid valve B is stuck open.

Gear positions supposed by TCM are as follows:
In case of gear position with no malfunctions: 1, 2 , 3 and 4 positions
In case of gear position with shift solenoid valve B stuck open: 4, 3* , 3 and 4 positions to each gear posi-
tion above
*: “P0732 A/T 2ND GR FNCTN” is detected.
Possible CauseUCS005OF

Shift solenoid valve B

Each clutch

Hydraulic control circuit
Gear position 1 2 3 4
Shift solenoid valve A ON (Closed) OFF (Open) OFF (Open) ON (Closed)
Shift solenoid valve B ON (Closed) ON (Closed) OFF (Open) OFF (Open)

AT-124
DTC P0733 A/T 3RD GEAR FUNCTION
Revision: June 20062007 Versa
DTC P0733 A/T 3RD GEAR FUNCTIONPFP:31940
DescriptionUCS005O I

This malfunction will not be detected while the OD OFF indicator lamp is indicating another self-diagnosis
malfunction.

This malfunction is detected when the A/T does not shift into third gear position as instructed by the TCM.
This is not caused by electrical malfunction (circuits open or shorted) but by mechanical malfunction such
as control valve sticking, improper solenoid valve operation, malfunctioning servo piston or brake band,
etc.
On Board Diagnosis LogicUCS005OJ

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “P0733 A/T 3RD GR FNCTN” with CONSULT-II is detected when A/T cannot be
shifted to the 3rd gear position even if electrical circuit is good.

This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by TCM
as follows:
Torque converter slip ratio = A x C/B
A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from ECM
C: Gear ratio determined as gear position which TCM supposes
If the actual gear position is higher than the position (3rd) supposed by TCM, the slip ratio will be more
than normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.
This malfunction will be caused when shift solenoid valve A is stuck closed.

Gear positions supposed by TCM are as follows.
In case of gear position with no malfunctions: 1, 2, 3 and 4 positions
In case of gear position with shift solenoid valve A stuck closed: 1, 1, 4* and 4 positions to each gear
position above
*: “P0733 A/T 3RD GR FNCTN” is detected.
Possible CauseUCS005OK

Shift solenoid valve A

Each clutch

Hydraulic control circuit
Gear position 1 2 3 4
Shift solenoid valve A ON (Closed) OFF (Open) OFF (Open) ON (Closed)
Shift solenoid valve B ON (Closed) ON (Closed) OFF (Open) OFF (Open)

AT-128
DTC P0734 A/T 4TH GEAR FUNCTION
Revision: June 20062007 Versa
DTC P0734 A/T 4TH GEAR FUNCTIONPFP:31940
DescriptionUCS005ON

This malfunction will not be detected while the OD OFF indicator lamp is indicating another self-diagnosis
malfunction.

This malfunction is detected when the A/T does not shift into fourth gear position or the torque converter
clutch does not lock up as instructed by the TCM. This is not caused by electrical malfunction (circuits
open or shorted) but by mechanical malfunction such as control valve sticking, improper solenoid valve
operation, malfunctioning oil pump or torque converter clutch, etc.
CONSULT-II Reference ValueUCS005OO
Remarks: Specification data are reference values.
On Board Diagnosis LogicUCS005OP

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “P0734 A/T 4TH GR FNCTN” with CONSULT-II is detected when A/T cannot be
shifted to the 4th gear position even if electrical circuit is good.

This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by TCM
as follows:
Torque converter slip ratio = A x C/B
A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from ECM
C: Gear ratio determined as gear position which TCM supposes
If the actual gear position is much lower than the position (4th) supposed by TCM, the slip ratio will be
much less than normal. In case the ratio does not reach the specified value, TCM judges this diagnosis
malfunction.
This malfunction will be caused when shift solenoid valve A is stuck open or shift solenoid valve B is stuck
closed.

Gear positions supposed by TCM are as follows.
In case of gear position with no malfunctions: 1, 2, 3 and 4 positions
In case of gear position with shift solenoid valve A stuck open: 2, 2, 3 and 3* positions
In case of gear position with shift solenoid valve B stuck closed: 1, 2, 2 and 1* positions to each gear
position above
*: “P0734 A/T 4TH GR FNCTN” is detected.
Possible CauseUCS005OQ

Shift solenoid valve A

Shift solenoid valve B

Line pressure solenoid valve

Each clutch

Hydraulic control circuit
Gear position 1 2 3 4
Shift solenoid valve A ON (Closed) OFF (Open) OFF (Open) ON (Closed)
Shift solenoid valve B ON (Closed) ON (Closed) OFF (Open) OFF (Open)
Item name Condition Display value (Approx.)
LINE PRES DTYSmall throttle opening (Low line pressure) ⇔ Large
throttle opening (High line pressure)0% ⇔ 94%

AT-134
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
Revision: June 20062007 Versa
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVEPFP:31940
DescriptionUCS005O T

The torque converter clutch solenoid valve is activated, with the gear in D4 and D3 , by the TCM in
response to signals sent from the vehicle speed sensor and the ECM (throttle opening). Lock-up piston
operation will then be controlled.

Lock-up operation, however, is prohibited when A/T fluid temperature is too low.

When the accelerator pedal is depressed (less than 2/8) on lock-up condition, the engine speed should
not change abruptly. If there is an abrupt change in engine speed, there is no lock-up.
CONSULT-II Reference ValueUCS005OU
Remarks: Specification data are reference values.
On Board Diagnosis LogicUCS005OV

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “P0740 T/C CLUTCH SOL/V” with CONSULT-II or 7th judgement flicker without
CONSULT-II is detected when TCM detects an improper voltage drop while it tries to operate solenoid
valve.
Possible CauseUCS005OW

Torque converter clutch solenoid valve

Harness or connector
(The solenoid circuit is open or shorted.)
DTC Confirmation ProcedureUCS005OX
CAUTION:

Always drive vehicle at a safe speed.

If performing this “DTC Confirmation Procedure” again, always turn ignition switch OFF and wait
at least 10 seconds before continuing.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1. Turn ignition switch ON. (Do not start engine.)
2. Select “DATA MONITOR” mode for “A/T” with CONSULT-II and
wait at least 1 second.
3. Touch “START”.
4. Start engine and maintain the following conditions for at least 5
consecutive seconds.
VEHICLE SPEED: 80 km/h (50 MPH) or more
THROTTLE POSI: 0.5/8 - 1.0/8
SLCT LVR POSI: “D” position
Driving location: Driving the vehicle uphill (increased
engine load) will help maintain the driving conditions
required for this test.
5. If the check result is NG, go to AT-136, "
Diagnostic Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-II”.
WITHOUT CONSULT-II
1. Start engine.
2. Drive vehicle in D
1 → D2 → D3 → D4 → D4 lock-up position.
3. Perform self-diagnosis. Refer to AT-90, "
Diagnostic Procedure Without CONSULT-II" .
4. If the check result is NG, go to AT-136, "
Diagnostic Procedure" .
Item name Condition Display value (Approx)
TCC S/V DUTY Lock-up OFF ⇔ Lock-up ON 4% ⇔ 94%
BCIA0031E

DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
AT-139
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Revision: June 20062007 Versa
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)PFP:31940
DescriptionUCS005P1

This malfunction will not be detected while the OD OFF indicator lamp is indicating another self-diagnosis
malfunction.

This malfunction is detected when the A/T does not shift into fourth gear position or the torque converter
clutch does not lock-up as instructed by the TCM. This is not caused by electrical malfunction (circuits
open or shorted) but by mechanical malfunction such as control valve sticking, improper solenoid valve
operation, malfunctioning oil pump or torque converter clutch, etc.
CONSULT-II Reference ValueUCS005P2
Remarks: Specification data are reference values.
On Board Diagnosis LogicUCS005P3

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “P0744 A/T TCC S/V FNCTN” with CONSULT-II is detected when A/T cannot per-
form lock-up even if electrical circuit is good.

This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by TCM
as follows:
Torque converter slip ratio = A x C/B
A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from ECM
C: Gear ratio determined as gear position which TCM supposes
If the actual gear position is much lower than the position (4th) supposed by TCM, the slip ratio will be
much less than normal. In case the ratio does not reach the specified value, TCM judges this diagnosis
malfunction.
This malfunction will be caused when shift solenoid valve B is stuck closed.

Gear positions supposed by TCM are as follows.
In case of gear position with no malfunctions: 1, 2, 3 and 4 positions
In case of gear position with shift solenoid valve B stuck closed: 1, 2, 2 and 1* positions to each gear posi-
tion above
*: “P0744 A/T TCC S/V FNCTN” is detected.
Possible CauseUCS005P4

Line pressure solenoid valve

Torque converter clutch solenoid valve

Each clutch

Hydraulic control circuit
Item name Condition Display value (Approx)
TCC S/V DUTY Lock-up OFF ⇔ Lock-up ON 4% ⇔ 94%