ecm NISSAN VERSA 2006 Workshop Service Manual PDF

EC-5
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ECA
Revision: June 20062007 Versa DTC Confirmation Procedure ............................... 399
Diagnostic Procedure ........................................... 400
DTC P0456 EVAP CONTROL SYSTEM ................ 406
On Board Diagnosis Logic ................................... 406
DTC Confirmation Procedure ............................... 407
Overall Function Check ........................................ 408
Diagnostic Procedure ........................................... 409
DTC P0460 FUEL LEVEL SENSOR ...................... 415
Component Description ........................................ 415
On Board Diagnostic Logic .................................. 415
DTC Confirmation Procedure ............................... 415
Diagnostic Procedure ........................................... 416
Removal and Installation ...................................... 416
DTC P0461 FUEL LEVEL SENSOR ...................... 417
Component Description ........................................ 417
On Board Diagnostic Logic .................................. 417
Overall Function Check ........................................ 417
Diagnostic Procedure ........................................... 418
Removal and Installation ...................................... 418
DTC P0462, P0463 FUEL LEVEL SENSOR .......... 419
Component Description ........................................ 419
On Board Diagnostic Logic .................................. 419
DTC Confirmation Procedure ............................... 419
Diagnostic Procedure ........................................... 420
Removal and Installation ...................................... 420
DTC P0500 VSS ..................................................... 421
Description ........................................................... 421
On Board Diagnosis Logic ................................... 421
DTC Confirmation Procedure ............................... 421
Overall Function Check ........................................ 422
Diagnostic Procedure ........................................... 422
DTC P0506 ISC SYSTEM ....................................... 423
Description ........................................................... 423
On Board Diagnosis Logic ................................... 423
DTC Confirmation Procedure ............................... 423
Diagnostic Procedure ........................................... 424
DTC P0507 ISC SYSTEM ....................................... 425
Description ........................................................... 425
On Board Diagnosis Logic ................................... 425
DTC Confirmation Procedure ............................... 425
Diagnostic Procedure ........................................... 426
DTC P0605 ECM .................................................... 427
Component Description ........................................ 427
On Board Diagnosis Logic ................................... 427
DTC Confirmation Procedure ............................... 427
Diagnostic Procedure ........................................... 428
DTC P0643 SENSOR POWER SUPPLY ................ 430
On Board Diagnosis Logic ................................... 430
DTC Confirmation Procedure ............................... 430
Wiring Diagram .................................................... 431
Diagnostic Procedure ........................................... 433
DTC P0850 PNP SWITCH ...................................... 436
Component Description ........................................ 436
CONSULT-II Reference Value in Data Monitor Mode
. 436
On Board Diagnosis Logic ................................... 436
DTC Confirmation Procedure ............................... 436
Overall Function Check ........................................ 437Wiring Diagram .....................................................438
Diagnostic Procedure ...........................................439
DTC P1148 CLOSED LOOP CONTROL ................442
On Board Diagnosis Logic ....................................442
DTC P1217 ENGINE OVER TEMPERATURE ........443
System Description ...............................................443
CONSULT-II Reference Value in Data Monitor Mode
.444
On Board Diagnosis Logic ....................................445
Overall Function Check ........................................445
Wiring Diagram .....................................................448
Diagnostic Procedure ...........................................450
Main 13 Causes of Overheating ...........................458
Component Inspection ..........................................459
DTC P1225 TP SENSOR ........................................460
Component Description ........................................460
On Board Diagnosis Logic ....................................460
DTC Confirmation Procedure ...............................460
Diagnostic Procedure ...........................................461
Removal and Installation ......................................461
DTC P1226 TP SENSOR ........................................462
Component Description ........................................462
On Board Diagnosis Logic ....................................462
DTC Confirmation Procedure ...............................462
Diagnostic Procedure ...........................................463
Removal and Installation ......................................463
DTC P1421 COLD START CONTROL ...................464
Description ............................................................464
On Board Diagnosis Logic ....................................464
DTC Confirmation Procedure ...............................464
Diagnostic Procedure ...........................................464
DTC P1564 ASCD STEERING SWITCH ................466
Component Description ........................................466
CONSULT-II Reference Value in Data Monitor Mode
.466
On Board Diagnosis Logic ....................................466
DTC Confirmation Procedure ...............................467
Wiring Diagram .....................................................468
Diagnostic Procedure ...........................................469
Component Inspection ..........................................472
DTC P1572 ASCD BRAKE SWITCH ......................473
Component Description ........................................473
CONSULT-II Reference Value in Data Monitor Mode
.473
On Board Diagnosis Logic ....................................473
DTC Confirmation Procedure ...............................474
Wiring Diagram .....................................................475
Diagnostic Procedure ...........................................476
Component Inspection ..........................................481
DTC P1574 ASCD VEHICLE SPEED SENSOR .....483
Component Description ........................................483
On Board Diagnosis Logic ....................................483
DTC Confirmation Procedure ...............................483
Diagnostic Procedure ...........................................484
DTC P1715 INPUT SPEED SENSOR (TURBINE
REVOLUTION SENSOR) ........................................485
Description ............................................................485
CONSULT-II Reference Value in Data Monitor Mode
.485

EC-8Revision: June 2006
INDEX FOR DTC
2007 Versa
INDEX FOR DTCPFP:00024
DTC No. IndexUBS00QB1
NOTE:

If DTC U1000 or U1001 is displayed with other DTC, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to EC-151, "
DTC U1000, U1001 CAN COMMUNICATION LINE" .

If DTC U1010 is displayed with other DTC, first perform the trouble diagnosis for DTC U1010.
Refer to EC-154, "
DTC U1010 CAN COMMUNICATION" .
DTC*1
Items
(CONSULT-II screen terms)Reference page
CONSULT-II
GST*
2ECM*3
U1000
1000*4CAN COMM CIRCUITEC-151
U1001
1001*4CAN COMM CIRCUITEC-151
U1010 1010 CONTROL UNIT(CAN)EC-154
P0000 0000NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.—
P0011 0011 INT/V TIM CONT-B1EC-156
P0031 0031 A/F SEN1 HTR (B1)EC-161
P0032 0032 A/F SEN1 HTR (B1)EC-161
P0037 0037 HO2S2 HTR (B1)EC-166
P0038 0038 HO2S2 HTR (B1)EC-166
P0075 0075 INT/V TIM V/CIR-B1EC-173
P0101 0101 MAF SEN/CIRCUITEC-178
P0102 0102 MAF SEN/CIRCUITEC-187
P0103 0103 MAF SEN/CIRCUITEC-187
P0112 0112 IAT SEN/CIRCUITEC-195
P0113 0113 IAT SEN/CIRCUITEC-195
P 0 11 7 0 11 7 E C T S E N / C I R CEC-200
P 0 11 8 0 11 8 E C T S E N / C I R CEC-200
P0122 0122 TP SEN 2/CIRCEC-206
P0123 0123 TP SEN 2/CIRCEC-206
P0125 0125 ECT SENSOREC-212
P0127 0127 IAT SENSOREC-215
P0128 0128 THERMSTAT FNCTNEC-218
P0130 0130 A/F SENSOR1 (B1)EC-220
P0131 0131 A/F SENSOR1 (B1)EC-227
P0132 0132 A/F SENSOR1 (B1)EC-233
P0133 0133 A/F SENSOR1 (B1)EC-239
P0137 0137 HO2S2 (B1)EC-248
P0138 0138 HO2S2 (B1)EC-257
P0139 0139 HO2S2 (B1)EC-267
P0171 0171 FUEL SYS-LEAN-B1EC-276
P0172 0172 FUEL SYS-RICH-B1EC-284
P0181 0181 FTT SENSOREC-291
P0182 0182 FTT SEN/CIRCUITEC-297
P0183 0183 FTT SEN/CIRCUITEC-297

INDEX FOR DTC
EC-9
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Revision: June 20062007 VersaP0222 0222 TP SEN 1/CIRCEC-302
P0223 0223 TP SEN 1/CIRCEC-302
P0300 0300 MULTI CYL MISFIREEC-308
P0301 0301 CYL 1 MISFIREEC-308
P0302 0302 CYL 2 MISFIREEC-308
P0303 0303 CYL 3 MISFIREEC-308
P0304 0304 CYL 4 MISFIREEC-308
P0327 0327 KNOCK SEN/CIRC-B1EC-315
P0328 0328 KNOCK SEN/CIRC-B1EC-315
P0335 0335 CKP SEN/CIRCUITEC-319
P0340 0340 CMP SEN/CIRC-B1EC-327
P0420 0420 TW CATALYST SYS-B1EC-334
P0441 0441 EVAP PURG FLOW/MONEC-340
P0442 0442 EVAP SMALL LEAKEC-346
P0443 0443 PURG VOLUME CONT/VEC-354
P0444 0444 PURG VOLUME CONT/VEC-362
P0445 0445 PURG VOLUME CONT/VEC-362
P0447 0447 VENT CONTROL VALVEEC-369
P0448 0448 VENT CONTROL VALVEEC-376
P0451 0451 EVAP SYS PRES SENEC-382
P0452 0452 EVAP SYS PRES SENEC-385
P0453 0453 EVAP SYS PRES SENEC-391
P0455 0455 EVAP GROSS LEAKEC-398
P0456 0456 EVAP VERY SML LEAKEC-406
P0460 0460 FUEL LEV SEN SLOSHEC-415
P0461 0461 FUEL LEVEL SENSOREC-417
P0462 0462 FUEL LEVL SEN/CIRCEC-419
P0463 0463 FUEL LEVL SEN/CIRCEC-419
P0500 0500
VEH SPEED SEN/CIRC*5EC-421
P0506 0506 ISC SYSTEMEC-423
P0507 0507 ISC SYSTEMEC-425
P0605 0605 ECMEC-427
P0643 0643 SENSOR POWER/CIRCEC-430
P0705 0705 PNP SW/CIRCAT- 9 7 (A/T),
CVT-78
(CVT)
P0710 0710 ATF TEMP SEN/CIRCAT- 1 0 2
(A/T),
CVT-85
(CVT)
P0715 0715 INPUT SPD SEN/CIRCCVT-90
P0720 0720
VEH SPD SEN/CIR AT*5AT- 1 0 7 (A/T),
CVT-95
(CVT)
P0725 0725 ENGINE SPEED SIGAT- 11 3
P0731 0731 A/T 1ST GR FNCTNAT- 11 7
P0732 0732 A/T 2ND GR FNCTNAT- 1 2 1
DTC*1
Items
(CONSULT-II screen terms)Reference page
CONSULT-II
GST*
2ECM*3

EC-10Revision: June 2006
INDEX FOR DTC
2007 Versa
P0733 0733 A/T 3RD GR FNCTNAT- 1 2 4
P0734 0734 A/T 4TH GR FNCTNAT- 1 2 8
P0740 0740 TCC SOLENOID/CIRCAT- 1 3 4
P0744 0744 A/T TCC S/V FNCTNAT- 1 3 9 (A/T),
CVT-110
(CVT)
P0745 0745 L/PRESS SOL/CIRCAT- 1 4 5
P0746 0746 PRS CNT SOL/A FCTNCVT-118
P0750 0750 SFT SOL A/CIRCAT- 1 5 1
P0755 0755 SFT SOL B/CIRCAT- 1 5 6
P0776 0776 PRS CNT SOL/B FCTNCVT-121
P0778 0778 PRS CNT SOL/B CIRCCVT-124
P0840 0840 TR PRS SENS/A CIRCCVT-129
P0845 0845 TR PRS SENS/B CIRCCVT-137
P0850 0850 P-N POS SW/CIRCUITEC-436
P1148 1148 CLOSED LOOP-B1EC-442
P1217 1217 ENG OVER TEMPEC-443
P1225 1225 CTP LEARNINGEC-460
P1226 1226 CTP LEARNINGEC-462
P1421 1421 COLD START CONTROLEC-464
P1564 1564 ASCD SWEC-466
P1572 1572 ASCD BRAKE SWEC-473
P1574 1574 ASCD VHL SPD SENEC-483
P1610 - P1615 1610 - 1615 NATS MALFUNCTIONBL-212
P1705 1705 TP SEN/CIRC CVTCVT-150
P1715 1715 IN PULY SPEEDEC-485 (A/T),
EC-486
(CVT)
P1740 1740 LU-SLCT SOL/CIRCCVT-158
P1760 1760 O/R CLTCH SOL/CIRCAT- 1 6 1
P1777 1777 STEP MOTR CIRCCVT-164
P1778 1778 STEP MOTR FNCCVT-168
P1805 1805 BRAKE SW/CIRCUITEC-488
P2100 2100 ETC MOT PWREC-493
P2101 2101 ETC FUNCTION/CIRCEC-499
P2103 2103 ETC MOT PWREC-493
P 2 11 8 2 11 8 E T C M O TEC-506
P 2 11 9 2 11 9 E T C A C T REC-511
P2122 2122 APP SEN 1/CIRCEC-513
P2123 2123 APP SEN 1/CIRCEC-513
P2127 2127 APP SEN 2/CIRCEC-519
P2128 2128 APP SEN 2/CIRCEC-519
P2135 2135 TP SENSOREC-526
P2138 2138 APP SENSOREC-532
P2A00 2A00 A/F SENSOR1 (B1)EC-540
DTC*1
Items
(CONSULT-II screen terms)Reference page
CONSULT-II
GST*
2ECM*3

EC-12Revision: June 2006
INDEX FOR DTC
2007 Versa
Alphabetical IndexUBS00QB2
NOTE:

If DTC U1000 or U1001 is displayed with other DTC, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to EC-151, "
DTC U1000, U1001 CAN COMMUNICATION LINE" .

If DTC U1010 is displayed with other DTC, first perform the trouble diagnosis for DTC U1010.
Refer to EC-154, "
DTC U1010 CAN COMMUNICATION" .
Items
(CONSULT-II screen terms)DTC*1
Reference page
CONSULT-II
GST*
2ECM*3
A/F SENSOR1 (B1) P0130 0130EC-220
A/F SENSOR1 (B1) P0131 0131EC-227
A/F SENSOR1 (B1) P0132 0132EC-233
A/F SENSOR1 (B1) P0133 0133EC-239
A/F SENSOR1 (B1) P2A00 2A00EC-540
A/F SEN1 HTR (B1) P0031 0031EC-161
A/F SEN1 HTR (B1) P0032 0032EC-161
A/T 1ST GR FNCTN P0731 0731AT- 11 7
A/T 2ND GR FNCTN P0732 0732AT-121
A/T 3RD GR FNCTN P0733 0733AT-124
A/T 4TH GR FNCTN P0734 0734AT-128
A/T TCC S/V FNCTN P0744 0744AT-139 (A/T),
CVT-110
(CVT)
APP SEN 1/CIRC P2122 2122EC-513
APP SEN 1/CIRC P2123 2123EC-513
APP SEN 2/CIRC P2127 2127EC-519
APP SEN 2/CIRC P2128 2128EC-519
APP SENSOR P2138 2138EC-532
ASCD BRAKE SW P1572 1572EC-473
ASCD SW P1564 1564EC-466
ASCD VHL SPD SEN P1574 1574EC-483
ATF TEMP SEN/CIRC P0710 0710AT-102 (A/T),
CVT-85
(CVT)
BRAKE SW/CIRCUIT P1805 1805EC-488
CAN COMM CIRCUIT U1000
1000*4EC-151
CAN COMM CIRCUIT U1001
1001*4EC-151
CKP SEN/CIRCUIT P0335 0335EC-319
CLOSED LOOP-B1 P1148 1148EC-442
CMP SEN/CIRC-B1 P0340 0340EC-327
COLD START CONTROL P1421 1421EC-464
CONTROL UNIT(CAN) U1010 1010EC-154
CTP LEARNING P1225 1225EC-460
CTP LEARNING P1226 1226EC-462
CYL 1 MISFIRE P0301 0301EC-308
CYL 2 MISFIRE P0302 0302EC-308
CYL 3 MISFIRE P0303 0303EC-308
CYL 4 MISFIRE P0304 0304EC-308

INDEX FOR DTC
EC-13
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EC
Revision: June 20062007 VersaECM P0605 0605EC-427
ECT SEN/CIRC P0117 0117EC-200
ECT SEN/CIRC P0118 0118EC-200
ECT SENSOR P0125 0125 EC-212
ENG OVER TEMP P1217 1217EC-443
ENGINE SPEED SIG P0725 0725AT - 11 3
ETC ACTR P2119 2119EC-511
ETC FUNCTION/CIRC P2101 2101EC-499
ETC MOT P2118 2118EC-506
ETC MOT PWR P2100 2100EC-493
ETC MOT PWR P2103 2103EC-493
EVAP GROSS LEAK P0455 0455EC-398
EVAP PURG FLOW/MON P0441 0441EC-340
EVAP SMALL LEAK P0442 0442EC-346
EVAP SYS PRES SEN P0451 0451EC-382
EVAP SYS PRES SEN P0452 0452EC-385
EVAP SYS PRES SEN P0453 0453EC-391
EVAP VERY SML LEAK P0456 0456EC-406
FTT SEN/CIRCUIT P0182 0182EC-297
FTT SEN/CIRCUIT P0183 0183EC-297
FTT SENSOR P0181 0181EC-291
FUEL LEV SEN SLOSH P0460 0460EC-415
FUEL LEVEL SENSOR P0461 0461EC-417
FUEL LEVL SEN/CIRC P0462 0462EC-419
FUEL LEVL SEN/CIRC P0463 0463EC-419
FUEL SYS-LEAN-B1 P0171 0171EC-276
FUEL SYS-RICH-B1 P0172 0172EC-284
HO2S2 (B1) P0137 0137EC-248
HO2S2 (B1) P0138 0138EC-257
HO2S2 (B1) P0139 0139EC-267
HO2S2 HTR (B1) P0037 0037EC-166
HO2S2 HTR (B1) P0038 0038EC-166
IAT SEN/CIRCUIT P0112 0112EC-195
IAT SEN/CIRCUIT P0113 0113EC-195
IAT SENSOR P0127 0127EC-215
INPUT SPD SEN/CIRC P0715 0715EC-486
IN PULY SPEED P1715 1715EC-485 (A/T),
EC-486
(CVT)
INT/V TIM CONT-B1 P0011 0011EC-156
INT/V TIM V/CIR-B1 P0075 0075EC-173
ISC SYSTEM P0506 0506EC-423
ISC SYSTEM P0507 0507EC-425
KNOCK SEN/CIRC-B1 P0327 0327EC-315
Items
(CONSULT-II screen terms)DTC*1
Reference page
CONSULT-II
GST*
2ECM*3

EC-14Revision: June 2006
INDEX FOR DTC
2007 Versa
*1: 1st trip DTC No. is the same as DTC No.
*2: This number is prescribed by SAE J2012.KNOCK SEN/CIRC-B1 P0328 0328EC-315
LU-SLCT SOL/CIRC P1740 1740CVT-158
L/PRESS SOL/CIRC P0745 0745AT-145
MAF SEN/CIRCUIT P0101 0101EC-178
MAF SEN/CIRCUIT P0102 0102EC-187
MAF SEN/CIRCUIT P0103 0103EC-187
MULTI CYL MISFIRE P0300 0300EC-308
NATS MALFUNCTION P1610 - P1615 1610 - 1615BL-212
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.P0000 0000 —
O/R CLTCH SOL/CIRC P1760 1760AT-161
P-N POS SW/CIRCUIT P0850 0850EC-436
PNP SW/CIRC P0705 0705AT- 9 7 (A/T),
CVT-78
(CVT)
PRS CNT SOL/A FCTN P0746 0746CVT-118
PRS CNT SOL/B CIRC P0778 0778CVT-124
PRS CNT SOL/B FCTN P0776 0776CVT-121
PURG VOLUME CONT/V P0443 0443EC-354
PURG VOLUME CONT/V P0444 0444EC-362
PURG VOLUME CONT/V P0445 0445EC-362
SENSOR POWER/CIRC P0643 0643EC-430
SFT SOL A/CIRC P0750 0750 AT-151
SFT SOL B/CIRC P0755 0755AT-156
STEP MOTR CIRC P1777 1777CVT-164
STEP MOTR FNC P1778 1778CVT-168
TCC SOLENOID/CIRC P0740 0740AT-134
THERMSTAT FNCTN P0128 0128EC-218
TP SEN 1/CIRC P0222 0222EC-302
TP SEN 1/CIRC P0223 0223EC-302
TP SEN 2/CIRC P0122 0122EC-206
TP SEN 2/CIRC P0123 0123EC-206
TP SENSOR P2135 2135EC-526
TP SEN/CIRC A/T P1705 1705CVT-150
TR PRS SENS/A CIRC P0840 0840CVT-129
TR PRS SENS/B CIRC P0845 0845CVT-137
TW CATALYST SYS-B1 P0420 0420EC-334
VEH SPD SEN/CIR AT*5P0720 0720AT-107 (A/T).
CVT-95
(CVT)
VEH SPEED SEN/CIRC*
5P0500 0500EC-421
VENT CONTROL VALVE P0447 0447EC-369
VENT CONTROL VALVE P0448 0448EC-376
Items
(CONSULT-II screen terms)DTC*1
Reference page
CONSULT-II
GST*
2ECM*3

EC-16Revision: June 2006
PRECAUTIONS
2007 Versa
PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
UBS00QB3
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
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WAR NIN G:

To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer.

Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.

Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
Precautions for Procedures without Cowl Top CoverUBS00RCH
When performing the procedure after removing cowl top cover, cover
the lower end of windshield with urethane, etc.
On Board Diagnostic (OBD) System of Engine and A/T, CVTUBS00QB4
The ECM has an on board diagnostic system. It will light up the malfunction indicator lamp (MIL) to warn the
driver of a malfunction causing emission deterioration.
CAUTION:

Be sure to turn the ignition switch OFF and disconnect the battery ground cable before any repair
or inspection work. The open/short circuit of related switches, sensors, solenoid valves, etc. will
cause the MIL to light up.

Be sure to connect and lock the connectors securely after work. A loose (unlocked) connector will
cause the MIL 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-
locking type harness connector. For description and how to disconnect, refer to PG-68, "
HAR-
NESS CONNECTOR" .

Be sure to route and secure the harnesses properly after work. The interference of the harness
with a bracket, etc. may cause the MIL to light up due to the short circuit.

Be sure to connect rubber tubes properly after work. A misconnected or disconnected rubber tube
may cause the MIL to light up due to the malfunction of the fuel injection system, etc.

Be sure to erase the unnecessary malfunction information (repairs completed) from the ECM and
TCM (Transmission control module) before returning the vehicle to the customer.
PIIB3706J

PRECAUTIONS
EC-17
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EC
Revision: June 20062007 Versa
PrecautionUBS00QB5

Always use a 12 volt battery as power source.

Do not attempt to disconnect battery cables while engine is
running.

Before connecting or disconnecting the ECM harness con-
nector, turn ignition switch OFF and disconnect negative
battery cable. Failure to do so may damage the ECM
because battery voltage is applied to ECM even if ignition
switch is turned OFF.

Before removing parts, turn ignition switch OFF and then
disconnect negative battery cable.

Do not disassemble ECM.

If battery cable is disconnected, the memory will return to
the initial ECM values.
The ECM will now start to self-control at its initial values.
Engine operation can vary slightly when the cable is dis-
connected. However, this is not an indication of a malfunc-
tion. Do not replace parts because of a slight variation.

If the battery is disconnected, the following emission-
related diagnostic information will be lost within 24 hours.
–Diagnostic trouble codes
–1st trip diagnostic trouble codes
–Freeze frame data
–1st trip freeze frame data
–System readiness test (SRT) codes
–Test values

When connecting ECM harness connector, fasten (B) it
securely with a lever (1) 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)
voltage to develop in coil and condenser, thus resulting in
damage to ICs.

Keep engine control system harness at least 10 cm (4 in)
away from adjacent harness, to prevent engine control sys-
tem malfunctions due to receiving external noise, degraded
operation of ICs, etc.

Keep engine control system parts and harness dry.
SEF 2 89 H
PBIA9222J
PBIB2947E
PBIB0090E

EC-18Revision: June 2006
PRECAUTIONS
2007 Versa

Before replacing ECM, perform “ECM Terminals and Refer-
ence Value” inspection and make sure ECM functions prop-
erly. Refer to EC-105, "
ECM Terminals and Reference Value"
.

Handle mass air flow sensor carefully to avoid damage.

Do not disassemble mass air flow sensor.

Do not clean mass air flow sensor with any type of deter-
gent.

Do not disassemble electric throttle control actuator.

Even a slight leak in the air intake system can cause seri-
ous incidents.

Do not shock or jar the camshaft position sensor (PHASE), crankshaft position sensor (POS).

After performing each TROUBLE DIAGNOSIS, perform DTC
Confirmation Procedure or Overall Function Check.
The DTC should not be displayed in the DTC Confirmation
Procedure if the repair is completed. The Overall Function
Check should be a good result if the repair is completed.

When measuring ECM signals with a circuit tester, never
allow the two tester probes to contact.
Accidental contact of probes will cause a short circuit and
damage the ECM power transistor.

Do not use ECM ground terminals when measuring input/
output voltage. Doing so may result in damage to the ECM's
transistor. Use a ground other than ECM terminals, such as
the ground.
MEF040D
SEF 2 17 U
SEF 3 48 N