2008 NISSAN LATIO ignition

CONTROL UNIT (RAM), CONTROL UNIT (ROM)
AT-163
< SERVICE INFORMATION >
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CONTROL UNIT (RAM), CONTROL UNIT (ROM)
DescriptionINFOID:0000000001703320
The TCM consists of a microcomputer and connectors for signal
input and output and for power supply. The unit controls the A/T.
On Board Diagnosis LogicINFOID:0000000001703321
• This is not an OBD-II self-diagnostic item.
• Diagnostic trouble code “CONTROL UNIT (RAM)”, “CONTROL UNIT (ROM)” with CONSULT-III is detected
when TCM memory (RAM) or (ROM) is malfunctioning.
Possible CauseINFOID:0000000001703322
TCM.
DTC Confirmation ProcedureINFOID:0000000001703323
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-III
1. Turn ignition switch ON and select “DATA MONITOR” mode for A/T with CONSULT-III.
2. Touch “START”.
3. Start engine.
4. Run engine for at least 2 seconds at idle speed.
5. If the check result is NG, go to AT-163, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001703324
1.CHECK DTC
With CONSULT-III
1. Turn ignition switch ON and select “SELF-DIAG RESULTS” mode for A/T with CONSULT-III.
2. Touch “ERASE”.
3. Perform AT-163, "
DTC Confirmation Procedure".
Is the
“CONTROL UNIT (RAM)” or “CONTROL UNIT (ROM)” displayed again?
YES >> Replace TCM. Refer to AT-202, "Removal and Installation".
NO >>INSPECTION END
SAT574J

MAIN POWER SUPPLY AND GROUND CIRCUIT
AT-165
< SERVICE INFORMATION >
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Diagnosis ProcedureINFOID:0000000001703326
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 terminals 10, 19
• Harness for short or open between battery and TCM terminal 28
• 10A fuse (No.13, located in the fuse block) and 10A fuse (No.49, located in the IPDM E/R)
• Ignition switch. Refer to PG-3
.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
3.CHECK TCM GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between TCM connector terminals and ground.
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 SYMPTOM
Drive for a while to check that there is no malfunction.
OK or NG
ItemConnec-
torTerminal Judgement standard (Approx.)
Power supply E3110 Battery voltage
19 Battery voltage
Power supply
(memory back-up)E32 28 Battery voltage
SCIA2656E
ItemConnec-
torTerminal Judgement standard (Approx.)
Power supply E3110 0 V
19 0 V
Power supply
(memory back-up)E32 28 Battery voltage
SCIA2657E
Item Connector Terminal Continuity
Ground E32 25, 48 - Ground Yes
SCIA2671E

AT-168
< SERVICE INFORMATION >
PNP, OD SWITCH AND CLOSED THROTTLE, WIDE OPEN THROTTLE POSI-
TION SIGNAL CIRCUIT
2.CHECK PNP SWITCH CIRCUIT
With CONSULT-III
1. Turn ignition switch ON. (Do not start engine.)
2. Select “TCM INPUT SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-III.
3. Read out “P·N”, “R”, “D”, “2” and “1” position switches moving selector lever to each position.
OK or NG
OK >> GO TO 4.
NG >> Check PNP switch circuit. Refer to AT- 8 6
.
3.CHECK PNP SWITCH CIRCUIT
Without CONSULT-III
1. Turn ignition switch ON. (Do not start engine.)
2. Check voltage between TCM connector terminals and ground
while moving selector lever through each position. Refer to AT-
87, "Wiring Diagram - AT - PNP/SW".
B: Battery voltage
0: 0V
OK or NG
OK >> GO TO 4.
NG >> Check PNP switch circuit. Refer to AT- 8 6
.
Item name Condition Display value
PN POSI SWWhen setting selector lever to “N” or “P” posi-
tion.ON
When setting selector lever to other positions. OFF
R POSITION SWWhen setting selector lever to “R” position. ON
When setting selector lever to other positions. OFF
D POSITION SWWhen setting selector lever to “D” positions. ON
When setting selector lever to other positions. OFF
2 POSITION SWWhen setting selector lever to “2” position. ON
When setting selector lever to other positions. OFF
1 POSITION SWWhen setting selector lever to “1” position. ON
When setting selector lever to other positions. OFF
Selector lever positionTe r m i n a l
36 35 34 27 26
“P”, “N” B0000
“R” 0B000
“D” 0 0 B 0 0
“2” 0 0 0 B 0
“1” 0000B
SCIA7162E

PNP, OD SWITCH AND CLOSED THROTTLE, WIDE OPEN THROTTLE POSI-
TION SIGNAL CIRCUIT
AT-169
< SERVICE INFORMATION >
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4.CHECK PNP SWITCH
1. Turn ignition switch OFF.
2. Disconnect PNP switch harness connector.
3. Check continuity between PNP switch harness connector termi-
nals.
OK or NG
OK >> GO TO 6.
NG >> GO TO 5.
5.CHECK CONTROL CABLE ADJUSTMENT
Check PNP switch again with control cable disconnected from manual shaft of A/T assembly. Refer to test
group 4.
OK or NG
OK >> Adjust control cable. Refer to AT-207, "Adjustment of A/T Position".
NG >> Check PNP switch (Refer to test group 1) again after adjusting PNP switch (Refer to AT-219
).
• If OK, INSPECTION END
• If NG, repair or replace PNP switch. Refer to AT-219, "
Park/Neutral Position (PNP) Switch".
6.DETECT MALFUNCTIONING ITEM
Check the following.
• 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 PNP switch and combination meter
• Harness for short or open between combination meter and TCM
• 10A fuse (No.51, located in the IPDM E/R)
• Combination meter. Refer to DI-4
.
• Ignition switch. Refer to PG-3
.
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.
7.CHECK OVERDRIVE CONTROL SWITCH CIRCUIT
With CONSULT-III
1. Turn ignition switch ON. (Do not start engine.)
2. Select “TCM INPUT SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-III.
3. Read out “OVERDRIVE SW”. Check the signal of overdrive control switch is indicated properly.
Without CONSULT-III
1. Turn ignition switch ON. (Do not start engine.)
Selector lever position Connector Terminal Continuity
“P”
F251 - 2, 3 - 7
Ye s
*Continuity
should not
exist in posi-
tions other
than the
specified
positions. “R” 3 - 8
“N” 1 - 2, 3 - 9
“D” 3 - 6
“2” 3 - 5
“1” 3 - 4
SCIA5588E
Item nameOverdrive control switch
ConditionDisplay value
OVERDRIVE SWDepressed ON
Released OFF

AT-170
< SERVICE INFORMATION >
PNP, OD SWITCH AND CLOSED THROTTLE, WIDE OPEN THROTTLE POSI-
TION SIGNAL CIRCUIT
2. Check voltage between A/T device harness connector terminal
and ground. Refer to AT-173, "
Wiring Diagram - AT - NONDTC".
OK or NG
OK >> GO TO 10.
NG >> GO TO 8.
8.CHECK OVERDRIVE CONTROL SWITCH
1. Turn ignition switch OFF.
2. Disconnect A/T device harness connector.
3. Check continuity between A/T device harness connector termi-
nals. Refer to AT-173, "
Wiring Diagram - AT - NONDTC".
OK or NG
OK >> GO TO 9.
NG >> Repair or replace damaged parts.
9.DETECT MALFUNCTIONING ITEM
Check the following.
• Harness for short or open between combination meter and A/T device harness connector
• Harness for short or open between A/T device harness connector and ground
• Combination meter. Refer to DI-4
.
OK or NG
OK >> GO TO 10.
NG >> Repair or replace damaged parts.
10.CHECK CLOSED THROTTLE POSITION AND WIDE OPEN THROTTLE POSITION SIGNAL CIRCUIT
With CONSULT-III
1. Turn ignition switch ON. (Do not start engine.)
2. Select “TCM INPUT SIGNALS” in “DATA MONITOR” mode for A/T with CONSULT-III.
3. Read out “CLOSED THL/SW” and “W/O THRL/P-SW” depressing and releasing accelerator pedal.
Check that the signals of throttle position are indicated properly.
OK or NG
OK >> GO TO 11.
NG >> Check the following. If any items are damaged, repair or replace damaged parts.
• Accelerator pedal position sensor. Refer toEC-493
.
Item Connector TerminalOverdrive
control switch
ConditionJudge-
ment
standard
(Approx.)
A/T device harness
connector (Overdrive
control switch)M38 1 - GroundReleasedBattery
voltage
Depressed 0 V
SCIA5336E
Item Connector TerminalOverdrive control
switch conditionContinuity
A/T device harness con-
nector (Overdrive con-
trol switch)M38 1 - 2Released No
Depressed Yes
SCIA5330E
Accelerator pedal conditionData monitor
CLOSED THL/SW W/O THRL/P-SW
Released ON OFF
Fully depressed OFF ON

TROUBLE DIAGNOSIS FOR SYMPTOMS
AT-177
< SERVICE INFORMATION >
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OD OFF indicator lamp does not come on for about 2 seconds when turning ignition switch to ON.
DIAGNOSTIC PROCEDURE
1.CHECK CAN COMMUNICATION LINE
Perform self-diagnosis. Refer to AT-73, "
CONSULT-III Function (A/T)" .
Is a malfunction in CAN communication indicated in the results?
YES >> Check CAN communication line. Refer to AT- 8 3 .
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-164, "
Wiring Diagram - AT - MAIN" .
3. Turn ignition switch OFF.
4. Check voltage between TCM connector terminals and ground.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
3.DETECT MALFUNCTIONING ITEM
Check the following.
• Harness for short or open between ignition switch and TCM connector terminals 10, 19. Refer to AT-164,
"Wiring Diagram - AT - MAIN" .
• Harness for short or open between battery and TCM connector terminal 28. Refer to AT-164, "
Wiring Dia-
gram - AT - MAIN" .
• 10A fuse (No.13, located in the fuse block) and 10A fuse (No.49, located in the IPDM E/R). Refer to AT-164,
"Wiring Diagram - AT - MAIN" .
• Ignition switch. Refer to PG-3
.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
4.CHECK TCM GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect TCM connector.
Item Connector Terminal Judgement standard (Approx.)
TCM connectorE3110 -
Ground
Battery voltage 19 -
Ground
E3228 -
Ground
SCIA2656E
Item Connector Terminal Judgement standard (Approx.)
TCM connectorE3110 -
Ground0V
19 -
Ground0V
E3228 -
GroundBattery voltage
SCIA2657E

AT-178
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS FOR SYMPTOMS
3. Check continuity between TCM connector terminals and ground.
Refer to AT-164, "
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.
• Harness for short or open between ignition switch and combination meter
• Combination meter. Refer to DI-4
.
OK or NG
OK >> GO TO 6.
NG >> Repair or replace damaged parts.
6.CHECK SYMPTOM
Check again. Refer to AT-53, "
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-71, "
TCM Terminal 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.
Engine Cannot Be Started in "P" and "N" PositionINFOID:0000000001703336
SYMPTOM:
•Engine cannot be started with selector lever in “P” or “N” position.
•Engine can be started with selector lever in “D”, “2”, “1” or “R” position.
DIAGNOSTIC PROCEDURE
1.CHECK PNP SWITCH
Check continuity between PNP switch harness connector terminals.
Refer to AT-87, "
Wiring Diagram - AT - PNP/SW" .
OK or NG
OK >> GO TO 3.
NG >> GO TO 2.
2.CHECK PNP SWITCH
Check PNP switch again with control cable disconnected from manual shaft of A/T assembly. Refer to test
group 1.
OK or NG
OK >> Adjust A/T position. Refer to AT-207, "Adjustment of A/T Position" .
Item Connector Terminal Continuity
TCM connector E32 25, 48 - Ground Yes
SCIA2671E
Selector lever position Connector terminal Continuity
“P”, “N”
F25 1 - 2Ye s
Other positions No
SCIA5606E

TROUBLE DIAGNOSIS FOR SYMPTOMS
AT-193
< SERVICE INFORMATION >
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OK >> GO TO 6.
NG >> Repair or replace damaged parts.
6.CHECK SYMPTOM
Check again. Refer to AT-55, "
Cruise Test - Part 1" .
OK or NG
OK >>INSPECTION END
NG >> GO TO 7.
7.CHECK TCM
1. Check TCM input/output signals. Refer to AT-71, "
TCM Terminal 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.
A/T Does Not Shift: D4→ D3, When OD OFFINFOID:0000000001703350
SYMPTOM:
A/T does not shift from D4 to D3 when OD OFF (OD OFF indicator lamp is on) on “Cruise Test — Part
3”.
DIAGNOSTIC PROCEDURE
1.CHECK CAN COMMUNICATION LINE
Perform self-diagnosis. Refer to AT-73, "
CONSULT-III Function (A/T)" or AT-78, "Diagnosis Procedure without
CONSULT-III" .
Is a malfunction in CAN communication indicated in the results?
YES >> Check CAN communication line. Refer to AT- 8 3 .
NO >> GO TO 2.
2.CHECK OVERDRIVE CONTROL SWITCH CIRCUIT
With CONSULT-III
1. Turn ignition switch ON. (Do not start engine)
2. Select “TCM INPUT SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-III.
3. Read out “OVERDRIVE SW”.
Check the signal of the overdrive control switch is indicated properly.
Without CONSULT-III
1. Turn ignition switch ON. (Do not start engine)
2. Check voltage between A/T device harness connector terminal
and ground. Refer toAT-173, "
Wiring Diagram - AT - NONDTC" .
Item nameOverdrive control switch
ConditionDisplay value
OVERDRIVE SWDepressed ON
Released OFF
Item Connector TerminalOverdrive
control switch
ConditionJudge-
ment
standard
(Approx.)
A/T device harness
connector (Overdrive
control switch)M38 1 - GroundReleasedBattery
voltage
Depressed 0V
SCIA5336E