2003 NISSAN TEANA ENGINE CONTROL

CAN COMMUNICATION LINE
AT-133
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CAN COMMUNICATION LINEPFP:31940
DescriptionBCS0012P
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent malfunction detection ability.
Many electronic control units are equipped onto a vehicle, and each control unit shares information and links
with other control units during operation (not independent). In CAN communication, control units are con-
nected with 2 communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission
with less wiring. Each control unit transmits/receives data but selectively reads required data only.
On Board Diagnosis LogicBCS0012Q
Diagnostic trouble code “CAN COMM CIRCUIT” with CONSULT-II or 12th judgement flicker without CON-
SULT-II is detected when TCM cannot communicate to other control units.
Possible CauseBCS0012R
Harness or connector
(CAN communication line is open or shorted.)
DTC Confirmation ProcedureBCS0012S
CAUTION:
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.
3. Wait at least 6 seconds or start engine and wait for at least 6
seconds.
4. If DTC is detected, go to AT- 1 3 5 , "
Diagnostic Procedure" .
WITHOUT CONSULT-II
1. Turn ignition switch ON.
2. Wait at least 6 seconds or start engine and wait at least 6 seconds.
3. Perform self-diagnosis. Refer to AT- 7 6 , "
Diagnostic Procedure Without CONSULT-II" .
4. If the check result is NG, go to AT- 1 3 5 , "
Diagnostic Procedure" .
BCIA0031E

AT-136
A/T 1ST GEAR FUNCTION

A/T 1ST GEAR FUNCTIONPFP:31940
DescriptionBCS00131

This malfunction will not be detected while A/T CHECK 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 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 LogicBCS00132

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
*: “A/T 1ST GR FNCTN” is detected.

Diagnostic trouble code “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.
Possible CauseBCS00133

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)

AT-140
A/T 2ND GEAR FUNCTION

A/T 2ND GEAR FUNCTIONPFP:31940
DescriptionBCS00136

This malfunction will not be detected while A/T CHECK indicator lamp is indicating another self-diagnosis
malfunction.

This malfunction is detected when A/T does not shift into second gear position as instructed by 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 LogicBCS00137

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
*: “A/T 2ND GR FNCTN” is detected.

Diagnostic trouble code “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.
Possible CauseBCS00138

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)

A/T 3RD GEAR FUNCTION
AT-143
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A/T 3RD GEAR FUNCTIONPFP:31940
DescriptionBCS0013B

This malfunction will not be detected while A/T CHECK indicator lamp is indicating another self-diagnosis
malfunction.

This malfunction is detected when A/T does not shift into third gear position as instructed by TCM. This is
not caused by electrical malfunction (circuits open or shorted) but by mechanical malfunction such as con-
trol valve sticking, improper solenoid valve operation, malfunctioning servo piston or brake band, etc.
On Board Diagnosis LogicBCS0013C

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
*: “A/T 3RD GR FNCTN” is detected.

Diagnostic trouble code “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.
Possible CauseBCS0013D

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-146
A/T 4TH GEAR FUNCTION

A/T 4TH GEAR FUNCTIONPFP:31940
DescriptionBCS0013G

This malfunction will not be detected while A/T CHECK indicator lamp is indicating another self-diagnosis
malfunction.

This malfunction is detected when A/T does not shift into fourth gear position or the torque converter
clutch does not lock up as instructed by 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 Value BCS0026N
On Board Diagnosis LogicBCS0013H

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 A stuck open: 2, 2, 3 and 3* position
In case of gear position with shift solenoid valve B stuck closed: 1, 2, 2 and 1* positions to each gear
position above
*: “A/T 4TH GR FNCTN” is detected.

Diagnostic trouble code “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.
Possible CauseBCS0013I

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% ⇔ 92%

A/T TCC S/V FUNCTION (LOCK-UP)
AT-151
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A/T TCC S/V FUNCTION (LOCK-UP)PFP:31940
DescriptionBCS0013L

This malfunction is detected when A/T does not shift into fourth gear position or torque converter clutch
does not lock-up as instructed by 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 ValueBCS0026O
On Board Diagnosis LogicBCS0013M

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

Diagnostic trouble code “A/T TCC S/V FNCTN” with CONSULT-II is detected when A/T cannot perform
lock-up even if electrical circuit is good.
Possible CauseBCS0013N

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%
LINE PRES DTYSmall throttle opening (Low line pressure) ⇔ Large throttle opening
(High line pressure)0% ⇔ 92%

AT-156
CONTROL UNIT (RAM)

CONTROL UNIT (RAM)PFP:31036
DescriptionBCS0013Q
TCM consists of a microcomputer and connectors for signal input
and output and for power supply. The unit controls A/T.
On Board Diagnosis LogicBCS0013R
Diagnostic trouble code “CONTROL UNIT (RAM)” with CONSULT-II is detected when TCM memory RAM is
malfunctioning.
Possible CauseBCS0013S
TCM.
DTC Confirmation ProcedureBCS0013T
CAUTION:
If performing this “DTC Confirmation Procedure” again, always turn ignition switch OFF and wait at
least 10 seconds before continuing.
WITH CONSULT-II
1. Turn ignition switch ON. (Do not start engine.)
2. Select “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Start engine.
4. Run engine for at least 2 seconds at idle speed.
5. If DTC is detected, go to AT- 1 5 6 , "
Diagnostic Procedure" .
Diagnostic ProcedureBCS0013U
1. CHECK DTC
With CONSULT-II
1. Turn ignition switch ON. (Do not start engine.)
2. Select “SELF-DIAG RESULTS” mode for “A/T” with CONSULT-II.
3. Touch “ERASE”.
4. Perform AT- 1 5 6 , "
DTC Confirmation Procedure" .
Is the
“CONTROL UNIT (RAM)” displayed again?
YES >> Replace TCM.
NO >>INSPECTION END
SAT574J
BCIA0031E

CONTROL UNIT (ROM)
AT-157
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CONTROL UNIT (ROM)PFP:31036
DescriptionBCS0013V
TCM consists of a microcomputer and connectors for signal input
and output and for power supply. The unit controls A/T.
On Board Diagnosis LogicBCS0013W
Diagnostic trouble code “CONTROL UNIT (ROM)” with CONSULT-II is detected when TCM memory ROM is
malfunctioning.
Possible CauseBCS0013X
TCM.
DTC Confirmation ProcedureBCS0013Y
CAUTION:
If performing this “DTC Confirmation Procedure” again, always turn ignition switch OFF and wait at
least 10 seconds before continuing.
WITH CONSULT-II
1. Turn ignition switch ON. (Do not start engine.)
2. Select “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Start engine.
4. Run engine for at least 2 seconds at idle speed.
5. If DTC is detected, go to AT- 1 5 7 , "
Diagnostic Procedure" .
Diagnostic ProcedureBCS0013Z
1. CHECK DTC
With CONSULT-II
1. Turn ignition switch ON. (Do not start engine.)
2. Select “SELF-DIAG RESULTS” mode for “A/T” with CONSULT-II.
3. Touch “ERASE”.
4. Perform AT- 1 5 7 , "
DTC Confirmation Procedure" .
Is the
“CONTROL UNIT (ROM)” displayed again?
YES >> Replace TCM.
NO >>INSPECTION END
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BCIA0031E