2007 NISSAN LATIO heater

EC-540Revision: June 2006
DTC P2A00 A/F SENSOR 1
2007 Versa
DTC P2A00 A/F SENSOR 1PFP:22693
Component DescriptionUBS00QNP
The air fuel ratio (A/F) sensor 1 is a planar one-cell limit current sen-
sor. The sensor element of the A/F sensor 1 is composed an elec-
trode layer, which transports ions. It has a heater in the element.
The sensor is capable of precise measurement = 1, but also in the
lean and rich range. Together with its control electronics, the sensor
outputs a clear, continuous signal throughout a wide range.
The exhaust gas components diffuse through the diffusion layer at
the sensor cell. An electrode layer is applied voltage, and this current
relative oxygen density in lean. Also this current relative hydrocar-
bon density in rich.
Therefore, the A/F sensor 1 is able to indicate air fuel ratio by this
electrode layer of current. In addition, a heater is integrated in the
sensor to ensure the required operating temperature of about 800°C
(1,472°F).
CONSULT-II Reference Value in Data Monitor ModeUBS00QNQ
Specification data are reference values.
On Board Diagnosis LogicUBS00QNR
To judge the malfunction, the A/F signal computed by ECM from the A/F sensor 1 signal is monitored not to be
shifted to LEAN side or RICH side.
PBIB3353E
PBIB3354E
MONITOR ITEM CONDITION SPECIFICATION
A/F SEN1 (B1)

Engine: After warming upMaintaining engine speed at
2,000 rpmFluctuates around 2.2V
DTC No. Trouble diagnosis name DTC detecting condition Possible Cause
P2A00
2A00Air fuel ratio (A/F) sensor 1
circuit range/performance

The output voltage computed by ECM from the
A/F sensor 1 signal is shifted to the lean side
for a specified period.

The A/F signal computed by ECM from the A/F
sensor 1 signal is shifted to the rich side for a
specified period.

Air fuel ratio (A/F) sensor 1

Air fuel ratio (A/F) sensor 1 heater

Fuel pressure

Fuel injector

Intake air leaks

DTC P2A00 A/F SENSOR 1
EC-543
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: June 20062007 Versa
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic ProcedureUBS00QNU
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten ground screws on the body.
Refer to EC-150, "
Ground Inspection" .
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
3 G A/F sensor 1 heater[Engine is running]

Warm-up condition

Idle speed
(More than 140 seconds after starting
engine)Approximately 2.9 - 8.8V
49 W A/F sensor 1[Engine is running]

Warm-up condition

Engine speed: 2,000 rpmApproximately 1.8V
Output voltage varies with air fuel
ratio.
53 B A/F sensor 1[Ignition switch: ON]Approximately 2.2V
PBIA8148J
:Vehicle front
1. Body ground E24 2. Engine ground F9 3. Engine ground F16
4. Body ground E15
BBIA0698E

EC-546Revision: June 2006
DTC P2A00 A/F SENSOR 1
2007 Versa
6. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1. Turn ignition switch ON.
2. Check voltage between A/F sensor 1 terminal 4 and ground with
CONSULT-II or tester.
OK or NG
OK >> GO TO 8.
NG >> GO TO 7.
7. DETECT MALFUNCTIONING PART
Check the following.

Harness connectors E8, F8

Harness for open or short between A/F sensor 1 and fuse
>> Repair or replace harness or connectors.
8. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between the following terminals. Refer to Wiring Diagram.
4. Check harness continuity between ECM terminals 49, 53 or A/F sensor 1 terminals 1, 2 and ground.
Refer to Wiring Diagram.
5. Also check harness for short to power.
OK or NG
OK >> GO TO 9.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
9. CHECK A/F SENSOR 1 HEATER
Refer to EC-165, "
Component Inspection" .
OK or NG
OK >> GO TO 10.
NG >> GO TO 11.
10. CHECK INTERMITTENT INCIDENT
Perform EC-143, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
OK or NG
OK >> GO TO 11.
NG >> Repair or replace.Voltage: Battery voltage
PBIB3308E
A/F sensor 1 terminal ECM terminal
149
253
Continuity should exist.
Continuity should not exist.

EC-562Revision: June 2006
ELECTRICAL LOAD SIGNAL
2007 Versa
ELECTRICAL LOAD SIGNALPFP:25350
CONSULT-II Reference Value in Data Monitor ModeUBS00PTM
Specification data are reference values.
Diagnostic ProcedureUBS00PTN
1. CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCITION-I
1. Turn ignition switch ON.
2. Check “LOAD SIGNAL” in “DATA MONITOR” mode with CON-
SULT-II under the following conditions.
OK or NG
OK >> GO TO 2.
NG >> GO TO 4.
2. CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-II
Check “LOAD SIGNAL” in “DATA MONITOR” mode with CONSULT-
II under the following conditions.
OK or NG
OK >> GO TO 3.
NG >> GO TO 5.
3. CHECK HEATER FAN SIGNAL CIRCUIT OVERALL FUNCTION
Check “HEATER FAN SW” in “DATA MONITOR” mode with CON-
SULT-II under the following conditions.
OK or NG
OK >>INSPECTION END.
NG >> GO TO 6.
MONITOR ITEM CONDITION SPECIFICATION
LOAD SIGNAL

Ignition switch: ONRear window defogger switch is ON and/or lighting
switch is in 2nd position.ON
Rear window defogger switch is OFF and lighting switch
is OFF.OFF
HEATER FAN SW

Ignition switch: ONHeater fan: Operating. ON
Heater fan: Not operating. OFF
Condition LOAD SIGNAL
Lighting switch: ON at 2nd position ON
Lighting switch: OFF OFF
PBIB0103E
Condition LOAD SIGNAL
Rear window defogger switch: ON ON
Rear window defogger switch: OFF OFF
PBIB0103E
Condition LOAD SIGNAL
Heater fan control switch: ON ON
Heater fan control switch: OFF OFF
PBIB1995E

ELECTRICAL LOAD SIGNAL
EC-563
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: June 20062007 Versa
4. CHECK HEADLAMP SYSTEM
Refer to LT- 5 , "
HEADLAMP (FOR USA)" or LT-27, "HEADLAMP (FOR CANADA) - DAYTIME LIGHT SYS-
TEM -" .
>>INSPECTION END
5. CHECK REAR WINDOW DEFOGGER SYSTEM
Refer to GW-50, "
REAR WINDOW DEFOGGER" .
>>INSPECTION END
6. CHECK HEATER FAN CONTROL SYSTEM
Refer to MTC-24, "
TROUBLE DIAGNOSIS" .
>>INSPECTION END

EC-594Revision: June 2006
SERVICE DATA AND SPECIFICATIONS (SDS)
2007 Versa
SERVICE DATA AND SPECIFICATIONS (SDS)PFP:00030
Fuel PressureUBS00PUA
Idle Speed and Ignition TimingUBS00PUB
*: Under the following conditions:

Air conditioner switch: OFF

Electric load: OFF (Lights, heater fan & rear window defogger)

Steering wheel: Kept in straight-ahead position
Calculated Load ValueUBS00PUC
Mass Air Flow SensorUBS00PUD
*: Engine is warmed up to normal operating temperature and running under no load.
Intake Air Temperature SensorUBS00PUE
Engine Coolant Temperature SensorUBS00PUF
Air Fuel Ratio (A/F) Sensor 1 HeaterUBS00PUG
Heated Oxygen sensor 2 HeaterUBS00PUH
Crankshaft Position Sensor (POS)UBS00PUI
Refer to EC-326, "Component Inspection" .
Fuel pressure at idle
Approximately 350 kPa (3.57 kg/cm2 , 51 psi)
Target idle speedA/T No load* (in P or N position)
700 ± 50 rpm CVT No load* (In P or N position)
M/T No load* (in Neutral position)
Air conditioner: ONA/T In P or N position
700 rpm or more CVT In P or N position
M/T In Neutral position
Ignition timingA/T In P or N position
13 ± 5° BTDC CVT In P or N position
M/T In Neutral position
Calculated load value% (Using CONSULT-II or GST)
At idle10 - 35
At 2,500 rpm10 - 35
Supply voltageBattery voltage (11 - 14V)
Output voltage at idle1.0 - 1.3*V
Mass air flow (Using CONSULT-II or GST)1.0 - 4.0 g·m/sec at idle*
2.0 - 10.0 g·m/sec at 2,500 rpm*
Temperature °C (°F) Resistance kΩ
25 (77)1.800 - 2.200
Temperature °C (°F) Resistance kΩ
20 (68)2.1 - 2.9
50 (122)0.68 - 1.00
90 (194)0.236 - 0.260
Resistance [at 25°C (77°F)] 1.8 - 2.44Ω
Resistance [at 25°C (77°F)] 3.4 - 4.4Ω

EM-74Revision: June 2006
ENGINE ASSEMBLY
2007 Versa

Use either 2-pole lift type or separate type lift as best you can. If board-on type is used for
unavoidable reasons, support at the rear axle jacking point with a transmission jack or similar tool
before starting work, in preparation for the backward shift of center of gravity.

For supporting points for lifting and jacking point at rear axle, refer to GI-42, "Garage Jack and
Safety Stand and 2-Pole Lift" .
REMOVAL
Remove the engine and the transaxle assembly from the vehicle downward. Separate the engine and the tran-
saxle.
1. Remove engine undercover
2. Drain engine coolant from radiator. Refer to CO-8, "
Changing Engine Coolant" .
CAUTION:

Perform this step when the engine is cold.

Do not spill engine coolant on drive belt.
3. Remove front fender protector (RH and LH); Refer to EI-22, "
FENDER PROTECTOR" .
4. Remove exhaust front tube; Refer to EX-3, "
EXHAUST SYSTEM" .
5. Remove drive shafts (LH and RH) from steering knuckle. Refer to FAX-8, "
FRONT DRIVE SHAFT" .
6. Remove transaxle joint bolts which pierce at oil pan (upper) lower rear side. Refer to AT - 2 5 3 , "
TRAN-
SAXLE ASSEMBLY" (A/T models), CVT-207, "TRANSAXLE ASSEMBLY" (CVT) or MT-15, "TRAN-
SAXLE ASSEMBLY" (M/T models).
7. Remove rear torque rod (1).
NOTE:
A/T model shown CVT and M/T models similar.
8. Remove hood assembly. Refer to BL-14, "
HOOD" .
9. Remove cowl top cover and cowl top extension assembly. Refer to EI-20, "
COWL TOP" .
10. Release fuel pressure. Refer to EC-81, "
FUEL PRESSURE RELEASE" .
11. Remove battery and battery tray; Refer to SC-4, "
BATTERY" .
12. Remove drive belt; Refer to EM-13, "
Components" .
13. Remove air duct and air cleaner case assembly; Refer to EM-16, "
AIR CLEANER AND AIR DUCT" .
14. Remove cooling fan assembly.
15. Remove radiator hose (upper and lower). Refer to CO-11, "
RADIATOR" .
16. Disconnect A/T, CVT fluid cooler hoses. Refer to CO-11, "
RADIATOR"
17. Disconnect all connections of engine harness around the engine mounting insulator (LH), and then tem-
porarily secure the engine harness into the engine side.
CAUTION:
Protect connectors using a resin bag to protect against foreign materials during the operation.
18. Disconnect fuel feed hose at engine side. Refer to EM-33, "
Components" .
19. Disconnect heater hoses, and install plugs them to prevent engine coolant from draining. Refer to CO-20,
"Components" .
20. Disconnect control cable from transaxle. Refer to CVT-191, "
SHIFT CONTROL SYSTEM" (CVT) or AT -
229, "SHIFT CONTROL SYSTEM" (A/T), MT-12, "CONTROL LINKAGE" (MT).
21. Remove ground cable at transaxle side.
22. Remove ground cable between front cover and vehicle.
23. Remove alternator. Refer to SC-24, "
CHARGING SYSTEM" .
LBIA0460E

EM-78Revision: June 2006
CYLINDER BLOCK
2007 Versa
Disassembly and AssemblyEBS00U7X
DISASSEMBLY
1. Remove engine and transaxle assembly from vehicle, separate transaxle from engine. Refer to EM-73,
"ENGINE ASSEMBLY" .
2. Install engine to engine stand as follows;
a. Remove flywheel (M/T models) or drive plate (1) (A/T or CVT
models).

Secure flywheel (M/T models) or drive plate (A/T or CVT mod-
els) using Tool (A), and remove bolts.
CAUTION:
Be careful not to damage or scratch drive plate (A/T or CVT
models) and contact surface for clutch disc of flywheel (M/T
models).
NOTE:
Figure shows drive plate (A/T or CVT models)
b. Lift the engine with a hoist to install it onto widely use engine stand.
CAUTION:

Use the engine stand that has a load capacity [approximately 135 kg (298 lb) or more] large
enough for supporting the engine weight.

If the load capacity of stand is not adequate, remove the following parts beforehand to reduce the
potential risk of overturning stand.
–Exhaust manifold; Refer to EM-21, "EXHAUST MANIFOLD" .
–Rocker cover; Refer to EM-30, "IGNITION COIL, SPARK PLUG AND ROCKER COVER" .
NOTE:
The figure shows an example of widely used engine stand (A)
that can support mating surface of transaxle with flywheel (M/T
models) or drive plate (A/T or CVT models) removed.
CAUTION:
Before removing the hanging chains, make sure the engine
stand is stable and there is no risk of overturning.
3. Remove oil pan (upper and lower). Refer to EM-24, "
OIL PAN" .
4. Remove cylinder head. Refer to EM-62, "
CYLINDER HEAD" .
5. Remove thermostat housing. Refer to CO-18, "
THERMOSTAT" .
1. Cylinder block 2. O-ring 3. Crankshaft position sensor (POS)
4.Crankshaft position sensor (POS)
cover5.Oil filter (for intake valve timing con-
trol)6. Knock sensor
7. Oil pressure switch 8. Top ring 9. Second ring
10. Oil ring 11. Snap ring 12. Piston
13. Piston pin 14. Connecting rod 15. Thrust bearing
16. Connecting rod bearing upper 17. Main bearing upper 18. Crankshaft key
19. Main bearing lower 20. Connecting rod bearing lower 21. Connecting rod bearing cap
22. Connecting rod bolt 23. Main bearing cap 24. Main bearing cap bolt
25. Crankshaft 26. Pilot converter (A/T or CVT models) 27. Signal plate
28. Rear oil seal 29. Drive plate (A/T or CVT models) 30. Reinforcement plate (A/T or CVT
models)
31. Flywheel (M/T models) 32. Block heater (Canada only) A. Refer to EM-81
Tool number : KV 11105210 (J-44716)
PBIC3226J
PBIC3227J