2003 NISSAN TEANA Power

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
SAT574J
BCIA0031E

AT-158
MAIN POWER SUPPLY AND GROUND CIRCUIT

MAIN POWER SUPPLY AND GROUND CIRCUITPFP:00100
Wiring Diagram — AT — MAINBCS0012Z
TCWM0519E

MAIN POWER SUPPLY AND GROUND CIRCUIT
AT-159
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Data are reference value and are measured between each terminal and ground.
Diagnostic ProcedureBCS0026M
1. CHECK TCM POWER SOURCE
1. Turn ignition switch ON. (Do not start engine.)
2. Check voltage between TCM connector terminals and ground.
3. Turn ignition switch OFF.
4. Check voltage between TCM connector terminals and ground.
OK or NG
OK >> GO TO 3.
NG >> GO TO 2.
2. DETECT MALFUNCTIONING ITEM
Check the following items:

Harness for short or open between ignition switch and TCM connector terminals 10, 19

Harness for short or open between battery and TCM connector terminal 28

10A fuse (No.17, located in the fuse block) and 10A fuse (No83, located in the IPDM E/R)

Ignition switch. Refer to PG-3, "POWER SUPPLY ROUTING CIRCUIT" .
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
Te r m i -
nalWire color Item ConditionJudgement stan-
dard
(Approx.)
10 Y Power source
or When turning ignition switch ON. Battery voltage
When turning ignition switch OFF. 0 V
19 Y Power sourceWhen turning ignition switch ON. Battery voltage
When turning ignition switch OFF. 0 V
25 B Ground Always 0 V
28 Y/RPower source
(Memory back-up)Always Battery voltage
48 B Ground Always 0 V
ItemConnec-
torTerminal Judgement standard (Approx.)
TCM connectorF10410
Battery voltage 19
F105 28
SCIA2656E
ItemConnec-
torTerminal Judgement standard (Approx.)
TCM connectorF10410 0V
19 0V
F105 28 Battery voltage
SCIA2657E

AT-160
MAIN POWER SUPPLY AND GROUND CIRCUIT

3. CHECK TCM GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect TCM connector.
3. Check continuity between TCM connector terminal and ground.
OK or NG
OK >>INSPECTION END.
NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
ItemConnec-
torTerminal Continuity
TCM connector F10525, 48 -
GroundYe s
SCIA2671E

PNP, 3RD POSITION SWITCH AND CLOSED THROTTLE, WIDE OPEN THROT-
TLE POSITION SIGNAL
AT-163
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3. CHECK PNP SWITCH CIRCUIT (WITHOUT CONSULT-II)
Without CONSULT-II
1. Turn ignition switch ON. (Do not start engine.)
2. Check voltage between TCM connector F105 terminals and
ground while moving selector lever through each position. Refer
to AT- 1 6 8 , "
Wiring Diagram — AT — NONDTC" .
B: Battery voltage
0: 0V
OK or NG
OK >> GO TO 7.
NG >> GO TO 4.
4. CHECK PNP SWITCH
Check PNP switch. Refer to AT- 1 6 6 , "
PNP SWITCH" .
OK or NG
OK >> GO TO 5.
NG >> Repair or replace damaged parts.
5. DETECT MALFUNCTIONING ITEM
Check the following items:

Harness for short or open between ignition switch and PNP switch.

Harness for short or open between PNP switch and TCM.

Harness for short or open between unified meter and A/C amp and PNP switch.

Harness for short or open between unified meter and A/C amp and TCM.

10A fuse (No.14, located in the fuse block)

Unified meter and A/C amp. Refer to DI-27, "UNIFIED METER AND A/C AMP" .

Ignition switch. Refer to PG-3, "POWER SUPPLY ROUTING CIRCUIT" .
OK or NG
OK >> GO TO 6.
NG >> Repair or replace damaged parts.
Lever positionTerminal
36 35 34 27 26
“P”, “N” B 0 0 0 0
“R” 0 B 0 0 0
“D”·“3” 0 0 B 0 0
“2” 0 0 0 B 0
“1” 0 0 0 0 B
SCIA4343E

AT-164
PNP, 3RD POSITION SWITCH AND CLOSED THROTTLE, WIDE OPEN THROT-
TLE POSITION SIGNAL

6. CHECK 3RD POSITION SWITCH CIRCUIT
With CONSULT-II
1. Turn ignition switch ON. (Do not start engine)
2. Select “TCM INPUT SIGNALS” in “DATA MONITOR” mode for
“A/T” with CONSULT-II.
3. Read out “OVERDRIVE SW” switch moving selector lever to
each position.
Without CONSULT-II
1. Turn ignition switch ON. (Do not start engine.)
2. Check voltage between A/T device harness connector terminal
and ground. Refer to AT- 1 6 8 , "
Wiring Diagram — AT — NON-
DTC" .
OK or NG
OK >> GO TO 9.
NG >> GO TO 7.
7. CHECK 3RD POSITION SWITCH
Check 3rd position switch. Refer to AT- 1 6 6 , "
3RD POSITION SWITCH" .
OK or NG
OK >> GO TO 8.
NG >> Repair or replace damaged parts.
8. DETECT MALFUNCTIONING ITEM
Check the following items:

Harness for short or open between A/T device and ground.

Harness for short or open between unified meter and A/C amp and A/T device.
OK or NG
OK >> GO TO 9.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
Item name Condition Display value
OVERDRIVE SWWhen setting selector lever to
“3” and “2” positions.ON
When setting selector lever to
other positions.OFF
SCIA4730E
Item Connector Terminal ConditionData
(Approx.)
3rd position
switchM62 1 - GroundWhen setting
selector lever to
“3” and “2” posi-
tions.0V
When setting
selector lever to
other positions.Battery
voltage
SCIA7858E

TROUBLE DIAGNOSIS FOR SYMPTOMS
AT-173
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A/T CHECK Indicator Lamp Does Not Come OnBCS00149
SYMPTOM:
A/T CHECK indicator lamp does not come on for about 2 seconds when turning ignition switch ON.
DIAGNOSTIC PROCEDURE
1. CHECK CAN COMMUNICATION LINE
Perform the self-diagnosis. Refer to AT- 6 9 , "
SELF-DIAGNOSTIC RESULT MODE" .
Is a malfunction in CAN communication indicated in the results?
YES >> Check CAN communication line. Refer to AT- 1 3 3 , "CAN COMMUNICATION LINE" .
NO >> GO TO 2.
2. CHECK TCM POWER SOURCE
1. Turn ignition switch ON. (Do not start engine.)
2. Check voltage between TCM connector terminals and ground.
Refer to AT- 1 5 8 , "
Wiring Diagram — AT — MAIN" .
3. Turn ignition switch OFF.
4. Check voltage between TCM connector terminals and ground.
Refer to AT- 1 5 8 , "
Wiring Diagram — AT — MAIN" .
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
3. DETECT MALFUNCTIONING ITEM
Check the following items:

Harness for short or open between ignition switch and TCM connector terminals 10, 19
Refer to AT- 1 5 8 , "
Wiring Diagram — AT — MAIN" .

Harness for short or open between battery and TCM connector terminal 28
Refer to AT- 1 5 8 , "
Wiring Diagram — AT — MAIN" .

15A fuse (No.17, located in the fuse block) and 10A fuse (No.83, located in the IPDM E/R)

Ignition switch. Refer to PG-3, "POWER SUPPLY ROUTING CIRCUIT" .
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
Item Connector Terminal Judgement standard (Approx.)
TCM connectorF10410
Battery voltage 19
F105 28
SCIA2656E
ItemConnec-
torTerminal Judgement standard (Approx.)
TCM connectorF10410 0 V
19 0 V
F105 28 Battery voltage
SCIA2657E

AT-174
TROUBLE DIAGNOSIS FOR SYMPTOMS

4. CHECK TCM GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between TCM connector terminals and ground.
Refer to AT- 1 5 8 , "
Wiring Diagram — AT — MAIN" .
OK or NG
OK >> GO TO 5.
NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
5. DETECT MALFUNCTIONING ITEM
Check the following items:

Harness and fuse for short or open between ignition switch and A/T CHECK indicator lamp
Refer to PG-3, "
POWER SUPPLY ROUTING CIRCUIT" .

Harness for short or open between A/T CHECK indicator lamp and TCM
OK or NG
OK >> GO TO 6.
NG >> Repair or replace damaged parts.
6. SYMPTOM CHECK
Check again. Refer to AT- 4 8 , "
Check Before Engine Is Started" .
OK or NG
OK >>INSPECTION END
NG >> GO TO 7.
7. CHECK TCM
1. Check TCM input/output. Refer to AT- 6 4 , "
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 connector F10525
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SCIA2671E