EC-1
ENGINE
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SECTION EC
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CONTENTS
ENGINE CONTROL SYSTEM
HR16DE
PRECAUTION
8
PRECAUTIONS 8
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER"
8
Precaution for Procedure without Cowl Top Cover 8
On Board Diagnostic (OBD) System of Engine

EVAP Canister Vent Control Valve 22
EVAP Control System Pressure Sensor 22
Exhaust Valve Timing Control Solenoid Valve 23
Fuel Injector 23
Fuel Pump 23
Heated Oxygen Sensor 2 24
Heated Oxygen Sensor 2 Heater 24
Ignition Coil With Power Transistor 24
Intake Air Temperature Sensor 24
Intake Valve Timing Control Solenoid Valve 25
Knock Sensor 25
Malfunction Indicator Lamp (MIL) 25
Mass Air Flow Sensor 26
Oil Pressure Warning Lamp 26
Refrigerant Pressure Sensor 26
Stop Lamp Switch & ASCD Brake Switch 26
Throttle Control Motor 26
Throttle Control Motor Relay 27
Throttle Position Sensor 27
ASCD Steering Switch 27
STRUCTURE AND OPERATION 28
Positive Crankcase Ventilation 28
On Board Refueling Vapor Recovery (ORVR) 29
SYSTEM 30
ENGINE CONTROL SYSTEM 30
ENGINE CONTROL SYSTEM : System Diagram 30
ENGINE CONTROL SYSTEM : System Descrip-
tion
31
MULTIPORT FUEL INJECTION SYSTEM 31

39
EVAPORATIVE EMISSION SYSTEM : System
Description
39
INTAKE VALVE TIMING CONTROL 40
INTAKE VALVE TIMING CONTROL : System Di-
agram
40
INTAKE VALVE TIMING CONTROL : System De-
scription
40
EXHAUST VALVE TIMING CONTROL 41
EXHAUST VALVE TIMING CONTROL : System
Diagram
41
EXHAUST VALVE TIMING CONTROL : System
Description
41
ENGINE PROTECTION CONTROL AT LOW EN-
GINE OIL PRESSURE
42
ENGINE PROTECTION CONTROL AT LOW EN-
GINE OIL PRESSURE : System Diagram
42
ENGINE PROTECTION CONTROL AT LOW EN-
GINE OIL PRESSURE : System Description
42
FUEL FILLER CAP WARNING SYSTEM 43
FUEL FILLER CAP WARNING SYSTEM :
System Diagram

Test (SRT) Code
54
DIAGNOSIS DESCRIPTION : Permanent Diag-
nostic Trouble Code (Permanent DTC)
55
DIAGNOSIS DESCRIPTION : Malfunction Indica-
tor Lamp (MIL)
56
On Board Diagnosis Function 56
CONSULT Function 59
ECU DIAGNOSIS INFORMATION 68
ECM 68
Reference Value 68
Fail Safe 79
DTC Inspection Priority Chart 81
DTC Index 82
Test Value and Test Limit 85
WIRING DIAGRAM 92
ENGINE CONTROL SYSTEM 92
Wiring Diagram 92
BASIC INSPECTION 111
DIAGNOSIS AND REPAIR WORKFLOW 111
Work Flow 111
Diagnostic Work Sheet 114
ADDITIONAL SERVICE WHEN REPLACING
ECM
116
Description 116
Work Procedure 116
ACCELERATOR PEDAL RELEASED POSI-

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FUEL PRESSURE CHECK 126
Work Procedure 126
HOW TO SET SRT CODE 128
Description 128
SRT Set Driving Pattern 129
Work Procedure 131
HOW TO ERASE PERMANENT DTC 134
Description 134
Work Procedure (Group A) 135
Work Procedure (Group B) 137
DTC/CIRCUIT DIAGNOSIS 140
TROUBLE DIAGNOSIS - SPECIFICATION
VALUE
140
Description 140
Component Function Check 140
Diagnosis Procedure 141
POWER SUPPLY AND GROUND CIRCUIT 148
Diagnosis Procedure 148
U0101 CAN COMM CIRCUIT 151
Description 151
DTC Logic 151
Diagnosis Procedure 151

Diagnosis Procedure 171
Component Inspection 173
P0102, P0103 MAF SENSOR 176
DTC Logic 176
Diagnosis Procedure 176
Component Inspection 178
P0111 IAT SENSOR 181
DTC Logic 181
Component Function Check 182
Diagnosis Procedure 182
Component Inspection 182
P0112, P0113 IAT SENSOR 183
DTC Logic 183
Diagnosis Procedure 183
Component Inspection 184
P0116 ECT SENSOR 185
DTC Logic 185
Component Function Check 186
Diagnosis Procedure 186
Component Inspection 186
P0117, P0118 ECT SENSOR 187
DTC Logic 187
Diagnosis Procedure 187
Component Inspection 188
P0122, P0123 TP SENSOR 189
DTC Logic 189
Diagnosis Procedure 189
Component Inspection 190
P0125 ECT SENSOR 192
DTC Logic 192

Diagnosis Procedure 217
Component Inspection 220
P0139 HO2S2 223
DTC Logic 223
Component Function Check 224
Diagnosis Procedure 225
Component Inspection 226
P014C, P014D, P015A, P015B, A/F SENSOR
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229
DTC Logic 229
Diagnosis Procedure 231
P0171 FUEL INJECTION SYSTEM FUNC-
TION
234
DTC Logic 234
Diagnosis Procedure 235
P0172 FUEL INJECTION SYSTEM FUNC-
TION
238
DTC Logic 238
Diagnosis Procedure 239
P0181 FTT SENSOR 242
DTC Logic 242
Component Function Check 243
Diagnosis Procedure 244
Component Inspection 245
P0182, P0183 FTT SENSOR 246
DTC Logic 246
Diagnosis Procedure 246

Component Inspection 270
P0420 THREE WAY CATALYST FUNCTION 271
DTC Logic 271
Component Function Check 272
Diagnosis Procedure 273
P0441 EVAP CONTROL SYSTEM 276
DTC Logic 276
Component Function Check 277
Diagnosis Procedure 278
P0442 EVAP CONTROL SYSTEM 281
DTC Logic 281
Diagnosis Procedure 282
Component Inspection (Fuel filler cap) 286
Component Inspection (Drain filter) 286
P0443 EVAP CANISTER PURGE VOLUME
CONTROL SOLENOID VALVE
288
DTC Logic 288
Diagnosis Procedure 289
Component Inspection 291
P0444, P0445 EVAP CANISTER PURGE
VOLUME CONTROL SOLENOID VALVE
293
DTC Logic 293
Diagnosis Procedure 293
Component Inspection 294
P0447 EVAP CANISTER VENT CONTROL
VALVE
296
DTC Logic 296

DTC Logic 304
Diagnosis Procedure 304
Component Inspection 305
P0452 EVAP CONTROL SYSTEM PRES-
SURE SENSOR
307
DTC Logic 307
Diagnosis Procedure 307
Component Inspection 309
P0453 EVAP CONTROL SYSTEM PRES-
SURE SENSOR
310
DTC Logic 310
Diagnosis Procedure 310
Component Inspection 313
P0455 EVAP CONTROL SYSTEM 314
DTC Logic 314
Diagnosis Procedure 315
Component Inspection (Fuel filler cap) 318
Component Inspection (Drain filter) 319
P0456 EVAP CONTROL SYSTEM 320
DTC Logic 320
Diagnosis Procedure 321
Component Inspection 325
P0460 FUEL LEVEL SENSOR 326
DTC Logic 326
Diagnosis Procedure 326
P0461 FUEL LEVEL SENSOR 327
DTC Logic 327
Component Function Check 327

DTC Logic 339
Diagnosis Procedure 340
Component Inspection 341
P0603 ECM POWER SUPPLY 342
Description 342
DTC Logic 342
Diagnosis Procedure 342
P0605 ECM 344
DTC Logic 344
Diagnosis Procedure 344
P0607 ECM 346
DTC Logic 346
Diagnosis Procedure 346
P0643 SENSOR POWER SUPPLY 347
DTC Logic 347
Diagnosis Procedure 347
P0850 PNP SWITCH 349
Description 349
DTC Logic 349
Component Function Check 350
Diagnosis Procedure 350
P1078 EVT CONTROL POSITION SENSOR . 352
DTC Logic 352
Diagnosis Procedure 352
Component Inspection 354
P1148 CLOSED LOOP CONTROL 355
DTC Logic 355
Diagnosis Procedure 355
P1212 TCS COMMUNICATION LINE 356
Description 356

Diagnosis Procedure 372
P1720 VSS 373
Description 373
DTC Logic 373
Diagnosis Procedure 373
P1805 BRAKE SWITCH 375
DTC Logic 375
Diagnosis Procedure 375
Component Inspection 376
P2100, P2103 THROTTLE CONTROL MO-
TOR RELAY
377
DTC Logic 377
Diagnosis Procedure 377
P2101 ELECTRIC THROTTLE CONTROL
FUNCTION
380
DTC Logic 380
Diagnosis Procedure 380
Component Inspection 383
P2118 THROTTLE CONTROL MOTOR 384
DTC Logic 384
Diagnosis Procedure 384
Component Inspection 385
P2119 ELECTRIC THROTTLE CONTROL
ACTUATOR
386
DTC Logic 386
Diagnosis Procedure 386
P2122, P2123 APP SENSOR 388

Diagnosis Procedure 411
FUEL INJECTOR 413
Component Function Check 413
Diagnosis Procedure 413
Component Inspection 414
FUEL PUMP 415
Component Function Check 415
Diagnosis Procedure 415
Component Inspection 417
IGNITION SIGNAL 418
Component Function Check 418
Diagnosis Procedure 418
Component Inspection (Ignition Coil with Power
Transistor)
421
Component Inspection (Condenser) 422
MALFUNCTION INDICATOR LAMP 423
Component Function Check 423
Diagnosis Procedure 423
ON BOARD REFUELING VAPOR RECOV-
ERY (ORVR)
424
Component Function Check 424
Diagnosis Procedure 424
Revision: July 2011 2012 Versa Sedan
EC-7
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Inspection 440
EVAP LEAK CHECK 441
Inspection 441
POSITIVE CRANKCASE VENTILATION 443
Inspection 443
REMOVAL AND INSTALLATION 444
ECM 444
Exploded View 444
Removal and Installation 444
SERVICE DATA AND SPECIFICATIONS
(SDS) 445
SERVICE DATA AND SPECIFICATIONS
(SDS)
445
Idle Speed 445
Ignition Timing 445
Calculated Load Value 445
Mass Air Flow Sensor 445
Revision: July 2011 2012 Versa Sedan
EC-8
< PRECAUTION >
[HR16DE]
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000007221637
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain

CAUTION:
• Be sure to turn the ignition switch OFF and disconnect the negative battery cable before any repair
or inspection work. The open/short circuit of related switches, sensors, solenoid valves, etc. will
cause the MI to light up.
• Be sure to connect and lock the connectors securely after work. A loose (unlocked) connector will
cause the MI to light up due to the open circuit. (Be sure the connector is free from water, grease,
dirt, bent terminals, etc.)
• Certain systems and components, especially those related to OBD, may use a new style slide-lock-
ing type harness connector. For description and how to disconnect, refer to PG-53, "
Description".
PIIB3706J
Revision: July 2011 2012 Versa Sedan
PRECAUTIONS
EC-9
< PRECAUTION >
[HR16DE]
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- Freeze frame data
- 1st trip freeze frame data
- System readiness test (SRT) codes
- Test values
• When connecting ECM harness connector (1), fasten (B) it
securely with a lever as far as it will go as shown in the figure.
-ECM (2)
- Loosen (A)
• When connecting or disconnecting pin connectors into or
from ECM, take care not to damage pin terminals (bend or
break).
Make sure that there are not any bends or breaks on ECM pin
terminal, when connecting pin connectors.
• Securely connect ECM harness connectors.
A poor connection can cause an extremely high (surge) volt-
age to develop in coil and condenser, thus resulting in dam-
age to ICs.
• Keep engine control system harness at least 10 cm (4 in) away
from adjacent harness, to prevent engine control system mal-
SEF289H
PBIA9222J
PBIB2947E
PBIB0090E
Revision: July 2011 2012 Versa Sedan
EC-10
< PRECAUTION >
[HR16DE]
PRECAUTIONS
functions due to receiving external noise, degraded operation of ICs, etc.
• Keep engine control system parts and harness dry.

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• Do not depress accelerator pedal when starting.
• Immediately after starting, do not rev up engine unnecessar-
ily.
• Do not rev up engine just prior to shutdown.
• When installing C.B. ham radio or a mobile phone, be sure to
observe the following as it may adversely affect electronic
control systems depending on installation location.
- Keep the antenna as far as possible from the electronic con-
trol units.
- Keep the antenna feeder line more than 20 cm (8 in) away
from the harness of electronic controls.
Do not let them run parallel for a long distance.
- Adjust the antenna and feeder line so that the standing-wave

Fuel tube adapter
LEC642
LBIA0376E
PBIB3043E
JSBIA0410ZZ
Revision: July 2011 2012 Versa Sedan
PREPARATION
EC-13
< PREPARATION >
[HR16DE]
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Tool name
(Kent-Moore No.)
Description
Leak detector

S-NT705
AEM488
S-NT779
Revision: July 2011 2012 Versa Sedan
EC-14
< SYSTEM DESCRIPTION >
[HR16DE]
COMPONENT PARTS
SYSTEM DESCRIPTION
COMPONENT PARTS
ENGINE CONTROL SYSTEM
ENGINE CONTROL SYSTEM : Component Parts Location INFOID:0000000007221643
1. Mass air flow sensor
(with intake air temperature sensor)
2. Electric throttle control actuator
(with built in throttle position sensor
and throttle control motor)
3. EVAP canister purge volume control
solenoid valve
4. Cooling fan motor 5. Refrigerant pressure sensor
Refer to HAC-8, "
Component Parts
Location".
6. ECM
7. IPDM E/R
Refer to PCS-3, "
Component Parts
Location".
ALBIA0741ZZ
Revision: July 2011 2012 Versa Sedan

7. Engine oil pressure sensor 8. Engine oil temperature sensor 9. Knock sensor
10. Engine coolant temperature sensor 11. Intake camshaft position sensor 12. Exhaust camshaft position sensor
13. Exhaust valve timing control sole-
noid valve
14. Fuel injector No.1 (Front) 15. Fuel injector No.1 (Rear)
16. Fuel injector No.2 (Front) 17. Fuel injector No.2 (Rear) 18. Fuel injector No.3 (Front)
19. Fuel injector No.3 (Rear) 20. Fuel injector No.4 (Front) 21. Fuel injector No.4 (Rear)
22. Crankshaft position sensor
A. Engine front right side B. Left view of the engine C. Engine rear right side
JSBIA0592ZZ
Revision: July 2011 2012 Versa Sedan
EC-16
< SYSTEM DESCRIPTION >
[HR16DE]
COMPONENT PARTS
1. A/F sensor 1 2. Heated oxygen sensor 2
JSBIA0565ZZ
Revision: July 2011 2012 Versa Sedan
COMPONENT PARTS
EC-17
< SYSTEM DESCRIPTION >
[HR16DE]
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Revision: July 2011 2012 Versa Sedan
EC-18
< SYSTEM DESCRIPTION >
[HR16DE]
COMPONENT PARTS
Accelerator Pedal Position Sensor
INFOID:0000000007221645
The accelerator pedal position sensor is installed on the upper end
of the accelerator pedal assembly. The sensor detects the accelera-
tor position and sends a signal to the ECM.
Accelerator pedal position sensor has two sensors. These sensors
are a kind of potentiometer which transform the accelerator pedal
position into output voltage, and emit the voltage signals to the ECM.
The ECM judges the current opening angle of the accelerator pedal
from these signals and controls the throttle control motor based on
these signals.
Idle position of the accelerator pedal is determined by the ECM
receiving the signal from the accelerator pedal position sensor. The
ECM uses this signal for the engine operation such as fuel cut.
Engine oil pressure sensor EC-21, "Engine Oil Pressure Sensor"
Engine oil temperature sensor EC-21, "Engine Oil Temperature Sensor"
EVAP canister purge volume control solenoid valve EC-22, "EVAP Canister Purge Volume Control Solenoid Valve"
EVAP canister vent control valve EC-22, "EVAP Canister Vent Control Valve"
EVAP control system pressure sensor EC-22, "EVAP Control System Pressure Sensor"
Exhaust camshaft position sensor EC-19, "Camshaft Position Sensor"
Exhaust valve timing control solenoid valve EC-23, "Exhaust Valve Timing Control Solenoid Valve"
Fuel injector EC-23, "Fuel Injector"
Fuel pump EC-23, "Fuel Pump"
Heated oxygen sensor 2 EC-24, "Heated Oxygen Sensor 2"
Heated oxygen sensor 2 heater EC-24, "Heated Oxygen Sensor 2 Heater"

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Air Fuel Ratio Sensor 1 INFOID:0000000007221646
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).
Air Fuel Ratio Sensor 1 Heater INFOID:0000000007221647
SYSTEM DESCRIPTION
The ECM performs ON/OFF duty control of the A/F sensor 1 heater corresponding to the engine operating
condition to keep the temperature of A/F sensor 1 element within the specified range.
Camshaft Position Sensor INFOID:0000000007221649
The camshaft position sensor senses the protrusion of camshaft to
identify a particular cylinder. The camshaft position sensor senses
the piston position.

Refer to EC-37, "
COOLING FAN CONTROL : System Description" for cooling fan operation.
Crankshaft Position Sensor INFOID:0000000007221651
The crankshaft position sensor is located on the cylinder block rear
housing facing the gear teeth (cogs) of the signal plate at end of the
crankshaft. It detects the fluctuation of the engine revolution.
The sensor consists of a permanent magnet and Hall IC.
When the engine is running, the high and low parts of the teeth
cause the gap with the sensor to change.
The changing gap causes the magnetic field near the sensor to
change.
Due to the changing magnetic field, the voltage from the sensor
changes.
The ECM receives the voltage signal and detects the fluctuation of
the engine revolution.
ECM receives the signals as shown in the figure.
ECM INFOID:0000000007221652
The ECM consists of a microcomputer and connectors for signal
input and output and for power supply. The ECM controls the engine.
Electric Throttle Control Actuator INFOID:0000000007221653
Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc.
The throttle control motor is operated by the ECM and it opens and closes the throttle valve.
JPBIA4880GB
PBIA9209J
JPBIA4880GB
PBIA9222J
Revision: July 2011 2012 Versa Sedan
COMPONENT PARTS
EC-21
< SYSTEM DESCRIPTION >

and transmits a voltage signal to the ECM.
Engine Oil Temperature Sensor INFOID:0000000007221656
The engine oil temperature sensor is used to detect the engine oil
temperature. The sensor modifies a voltage signal from the ECM.
The modified signal returns to the ECM as the engine oil tempera-
ture input. The sensor uses a thermistor which is sensitive to the
change in temperature. The electrical resistance of the thermistor
decreases as temperature increases.
SEF594K
Engine coolant temperature [°C (°F)] Voltage* (V) Resistance (kΩ)
–10 (14) 4.4 7.0 - 11.4
20 (68) 3.5 2.10 - 2.90
50 (122) 2.2 0.68 - 1.00
90 (194) 0.9 0.236 - 0.260
SEF012P
JSBIA0292ZZ
SEF594K
Revision: July 2011 2012 Versa Sedan
EC-22
< SYSTEM DESCRIPTION >
[HR16DE]
COMPONENT PARTS
<Reference data>
*: These data are reference values and are measured between ECM terminals.
EVAP Canister Purge Volume Control Solenoid Valve INFOID:0000000007221657
The EVAP canister purge volume control solenoid valve uses a ON/
OFF duty to control the flow rate of fuel vapor from the EVAP canis-
ter. The EVAP canister purge volume control solenoid valve is
moved by ON/OFF pulses from the ECM. The longer the ON pulse,
the greater the amount of fuel vapor that will flow through the valve.

PBIB3370E
Revision: July 2011 2012 Versa Sedan
COMPONENT PARTS
EC-23
< SYSTEM DESCRIPTION >
[HR16DE]
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Exhaust Valve Timing Control Solenoid Valve INFOID:0000000007221658
Exhaust valve timing control solenoid valve is activated by ON/OFF
pulse duty (ratio) signals from the ECM.
The exhaust valve timing control solenoid valve changes the oil
amount and direction of flow through exhaust valve timing control
unit or stops oil flow.
The longer pulse width retards valve angle.
The shorter pulse width advances valve angle.

Battery Battery voltage*
Condition Fuel pump operation
Ignition switch is turned to ON. Operates for 1 second.
Engine running and cranking Operates.
When engine is stopped Stops in 1.5 seconds.
Except as shown above Stops.
Revision: July 2011 2012 Versa Sedan
EC-24
< SYSTEM DESCRIPTION >
[HR16DE]
COMPONENT PARTS
Heated Oxygen Sensor 2
INFOID:0000000007221661
The heated oxygen sensor 2, after three way catalyst (manifold),
monitors the oxygen level in the exhaust gas.
Even if switching characteristics of the air fuel ratio (A/F) sensor 1
are shifted, the air-fuel ratio is controlled to stoichiometric, by the sig-
nal from the heated oxygen sensor 2.
This sensor is made of ceramic zirconia. The zirconia generates volt-
age from approximately 1 V in richer conditions to 0 V in leaner con-
ditions.
Under normal conditions the heated oxygen sensor 2 is not used for
engine control operation.
Heated Oxygen Sensor 2 Heater INFOID:0000000007221662
SYSTEM DESCRIPTION
The ECM performs ON/OFF control of the heated oxygen sensor 2 heater corresponding to the engine speed,
amount of intake air and engine coolant temperature.
OPERATION
Ignition Coil With Power Transistor INFOID:0000000007221663
The ignition signal from the ECM is sent to and amplified by the power transistor. The power transistor turns

< SYSTEM DESCRIPTION >
[HR16DE]
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<Reference data>
*: These data are reference values and are measured between ECM terminals.
Intake Valve Timing Control Solenoid Valve INFOID:0000000007221665
Intake valve timing control solenoid valve is activated by ON/OFF
pulse duty (ratio) signals from the ECM.
The intake valve timing control solenoid valve changes the oil
amount and direction of flow through intake valve timing control unit
or stops oil flow.
The longer pulse width advances valve angle.
The shorter pulse width retards valve angle.
When ON and OFF pulse widths become equal, the solenoid valve
stops oil pressure flow to fix the intake valve angle at the control