2007 INFINITI M35 fuel system

EC-510
[VQ35DE]
DTC P1220 FUEL PUMP CONTROL MODULE (FPCM)
Revision: 2007 April2007 M35/M45
DTC P1220 FUEL PUMP CONTROL MODULE (FPCM)PFP:17001
DescriptionNBS0053A
SYSTEM DESCRIPTION
*: ECM determines the start signal status by the signals of engine speed and battery voltage.
This system controls the fuel pump operation. The amount of fuel flow delivered from the fuel pump is altered
between two flow rates by the FPCM operation. The FPCM determines the voltage supplied to the fuel pump
(and therefore fuel flow) according to the following conditions.
COMPONENT DESCRIPTION
The FPCM adjusts the voltage supplied to the fuel pump to control
the amount of fuel flow. When the FPCM increases the voltage sup-
plied to the fuel pump, the fuel flow is increased. When the FPCM
decreases the voltage, the fuel flow is decreased.
CONSULT-II Reference Value in Data Monitor ModeNBS0053B
Specification data are reference values.
On Board Diagnosis LogicNBS0053C
Sensor Input Signal to ECM ECM function Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)Engine speed*
Fuel pump controlFuel pump control module
(FPCM) Mass air flow sensor Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Battery Battery voltage*
Conditions Amount of fuel flow Supplied voltage

Engine cranking

Engine coolant temperature is below 10°C (50°F).

Engine is running under heavy load and high speed conditionshighBattery voltage
(11 - 14V)
Except the above low Approximately 8V
SEF387X
MONITOR ITEM CONDITION SPECIFICATION
FPCM

Engine: Cranking HI

Engine: Idle

Engine coolant temperature: More than 10°C (50°F)LOW
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1220
1220Fuel pump control module
(FPCM)An improper voltage signal from the FPCM, which
is supplied to a point between the fuel pump and
the dropping resistor, is detected by ECM.

Harness or connectors
(FPCM circuit is shorted.)

Dropping resistor

FPCM

EC-522
[VQ35DE]
DTC P1421 COLD START CONTROL
Revision: 2007 April2007 M35/M45
DTC P1421 COLD START CONTROLPFP:23710
DescriptionNBS005S9
ECM controls ignition timing and engine idle speed when engine is started with prewarming up condition.
This control promotes the activation of three way catalyst by heating the catalyst and reduces emissions.
On Board Diagnosis LogicNBS005SA
DTC Confirmation ProcedureNBS005SB
NOTE:

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait
at least 10 seconds before conducting the next test.

If DTC P1421 is displayed with other DTC, first perform the trouble diagnosis for other DTC.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V at idle.
WITH CONSULT-II
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Select “DATA MONITOR” mode with CONSULT-II.
4. Check that the “COOLAN TEMP/S” indication is between 4°C
(39°F) and 36°C (97°F).
If “COOLAN TEMP/S” indication is within the specified value, go
to the following step.
If “COOLANT TEMP/S” indication is out of the specified value,
cool engine down or warm engine up and go to step 1.
5. Start engine and let it idle for 5 minutes.
6. If 1st trip DTC is detected, go to EC-522, "
Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II” above.
Diagnostic ProcedureNBS005SC
1. PERFORM IDLE AIR VOLUME LEARNING
Perform EC-86, "
Idle Air Volume Learning" .
Is Idle Air Volume Learning carried out successfully?
Ye s o r N o
Yes >> GO TO 2.
No >> Follow the instruction of Idle Air Volume Learning.
2. CHECK INTAKE SYSTEM
Check for the cause of intake air volume lacking. Refer to the following.

Crushed intake air passage

Intake air passage clogging
OK or NG
OK >> GO TO 3.
NG >> Repair or replace malfunctioning part
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1421
1421Cold start emission reduction
strategy monitoringECM does not control ignition timing and engine
idle speed properly when engine is started with
prewarming up condition.

Lack of intake air volume

Fuel injection system

ECM
SEF174Y

DTC P1421 COLD START CONTROL
EC-523
[VQ35DE]
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EC
Revision: 2007 April2007 M35/M45
3. CHECK FUEL INJECTION SYSTEM FUNCTION
Perform EC-309, "
DTC Confirmation Procedure" in DTC P0171, P0174 FUEL INJECTION SYSTEM FUNC-
TION.
OK or NG
OK >> GO TO 4.
NG >> Go to EC-315, "
Diagnostic Procedure" .
4. PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-II
1. Turn ignition switch ON.
2. Select “SELF DIAG RESULTS” mode with CONSULT-II.
3. Touch “ERASE”.
4.Perform DTC Confirmation Procedure.
See EC-522, "
DTC Confirmation Procedure" .
5. Is the 1st trip DTC P1421 displayed again?
With GST
1. Turn ignition switch ON.
2. Select Service $04 with GST.
3.Perform DTC Confirmation Procedure.
See EC-522, "
DTC Confirmation Procedure" .
4. Is the 1st trip DTC P1421 displayed again?
Ye s o r N o
Ye s > > G O T O 5 .
No >>INSPECTION END
5. REPLACE ECM
1. Replace ECM.
2. Perform initialization of IVIS (NATS) system and registration of all IVIS (NATS) ignition key IDs.
Refer to BL-248, "
ECM Re-Communicating Function" .
3. Perform EC-85, "
VIN Registration" .
4. Perform EC-86, "
Accelerator Pedal Released Position Learning" .
5. Perform EC-86, "
Throttle Valve Closed Position Learning" .
6. Perform EC-86, "
Idle Air Volume Learning" .
>>INSPECTION END

DTC P2A00, P2A03 A/F SENSOR 1
EC-653
[VQ35DE]
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Revision: 2007 April2007 M35/M45
4. CLEAR THE SELF-LEARNING DATA
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CONSULT-II.
3. Clear the self-learning control coefficient by touching “CLEAR”.
4. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected?
Is it difficult to start engine?
Without CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF.
3. Disconnect mass air flow sensor (1) harness connector.
4. Restart engine and let it idle for at least 5 seconds.
5. Stop engine and reconnect mass air flow sensor harness con-
nector.
6. Make sure DTC P0102 is displayed.
7. Erase the DTC memory. Refer to EC-68, "
HOW TO ERASE
EMISSION-RELATED DIAGNOSTIC INFORMATION" .
8. Make sure DTC P0000 is displayed.
9. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected?
Is it difficult to start engine?
Ye s o r N o
Yes >> Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to EC-309, "DTC
P0171, P0174 FUEL INJECTION SYSTEM FUNCTION" or EC-320, "DTC P0172, P0175 FUEL
INJECTION SYSTEM FUNCTION" .
No >> GO TO 5.
SEF968Y
PBIB2783E

EC-656
[VQ35DE]
DTC P2A00, P2A03 A/F SENSOR 1
Revision: 2007 April2007 M35/M45
11 . REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace malfunctioning air fuel ratio (A/F) sensor 1.
CAUTION:

Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a
hard surface such as a concrete floor; use a new one.

Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.
>>INSPECTION END
Removal and InstallationNBS0057N
AIR FUEL RATIO (A/F) SENSOR 1
Refer to EM-28, "EXHAUST MANIFOLD" .

FUEL PUMP
EC-675
[VQ35DE]
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Revision: 2007 April2007 M35/M45
FUEL PUMPPFP:17042
DescriptionNBS0057Z
SYSTEM DESCRIPTION
*: ECM determines the start signal status by the signals of engine speed and battery voltage.
The ECM activates the fuel pump for several seconds after the ignition switch is turned ON to improve engine
startability. If the ECM receives a engine speed signal from the camshaft position sensor (PHASE), it knows
that the engine is rotating, and causes the pump to operate. If the engine speed signal is not received when
the ignition switch is ON, the engine stalls. The ECM stops pump operation and prevents battery discharging,
thereby improving safety. The ECM does not directly drive the fuel pump. It controls the ON/OFF fuel pump
relay, which in turn controls the fuel pump.
COMPONENT DESCRIPTION
A turbine type design fuel pump is used in the fuel tank.

Fuel level sensor unit and fuel pump (1)

Fuel pressure regulator (2)

Fuel tank temperature sensor (3)
CONSULT-II Reference Value in Data Monitor ModeNBS00580
Specification data are reference values.
Sensor Input signal to ECM ECM Function Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)Engine speed*
Fuel pump control Fuel pump relay
Battery Battery voltage*
Condition Fuel pump operation
Ignition switch is turned to ON. Operates for 1 second.
Engine running and crankingOperates.
When engine is stoppedStops in 1.5 seconds.
Except as shown aboveStops.
PBIB2707E
MONITOR ITEM CONDITION SPECIFICATION
FUEL PUMP RLY

For 1 seconds after turning ignition switch: ON

Engine running or crankingON

Except above OFF

EC-720
[VK45DE]
INDEX FOR DTC
Revision: 2007 April2007 M35/M45
P0452 0452 EVAP SYS PRES SENEC-1139
P0453 0453 EVAP SYS PRES SENEC-1145
P0455 0455 EVAP GROSS LEAKEC-1153
P0456 0456 EVAP VERY SML LEAKEC-1160
P0460 0460 FUEL LEV SEN SLOSHEC-1169
P0461 0461 FUEL LEVEL SENSOREC-1171
P0462 0462 FUEL LEVL SEN/CIRCEC-1173
P0463 0463 FUEL LEVL SEN/CIRCEC-1173
P0500 0500
VEH SPEED SEN/CIRC*5EC-1175
P0506 0506 ISC SYSTEMEC-1177
P0507 0507 ISC SYSTEMEC-1179
P0550 0550 PW ST P SEN/CIRCEC-1181
P0603 0603 ECM BACK UP/CIRCUITEC-1186
P0605 0605 ECMEC-1190
P0643 0643 SENSOR POWER/CIRCEC-1193
P0700 0700 TCMAT- 11 2
P0705 0705 PNP SW/CIRCAT- 11 3
P0710 0710 ATF TEMP SEN/CIRCAT-135
P0717 0717 TURBINE SENSORAT- 11 7
P0720 0720
VEH SPD SEN/CIR AT*5AT- 11 9
P0740 0740 TCC SOLENOID/CIRCAT-126
P0744 0744 A/T TCC S/V FNCTNAT-128
P0745 0745 L/PRESS SOL/CIRCAT-130
P0850 0850 P-N POS SW/CIRCUITEC-1198
P1140 1140 INTK TIM S/CIRC-B1EC-1203
P1145 1145 INTK TIM S/CIRC-B2EC-1203
P1148 1148 CLOSED LOOP-B1EC-1211
P1168 1168 CLOSED LOOP-B2EC-1211
P1211 1211 TCS C/U FUNCTNEC-1212
P1212 1212 TCS/CIRCEC-1213
P1217 1217 ENG OVER TEMPEC-1214
P1220 1220 FPCM/CIRCUITEC-1225
P1225 1225 CTP LEARNINGEC-1233
P1226 1226 CTP LEARNINGEC-1235
P1550 1550 BAT CURRENT SENSOREC-1237
P1551 1551 BAT CURRENT SENSOREC-1244
P1552 1552 BAT CURRENT SENSOREC-1244
P1553 1553 BAT CURRENT SENSOREC-1251
P1554 1554 BAT CURRENT SENSOREC-1258
P1564 1564 ASCD SWEC-1265 (Models with ICC)
EC-1272
(Models with ASCD)
P1568 1568
ICC COMMAND VALUE*
6EC-1279
DTC*1
Items
(CONSULT-II screen terms)Reference page
CONSULT-II
GST*
2ECM*3

EC-724
[VK45DE]
INDEX FOR DTC
Revision: 2007 April2007 M35/M45
FUEL LEV SEN SLOSH P0460 0460EC-1169
FUEL SYS-LEAN-B1 P0171 0171EC-1022
FUEL SYS-LEAN-B2 P0174 0174EC-1022
FUEL SYS-RICH-B1 P0172 0172EC-1033
FUEL SYS-RICH-B2 P0175 0175EC-1033
HLR/C SOL/CIRC P1767 1767AT-159
HLR/C SOL FNCTN P1769 1769AT-161
HO2S2 HTR (B1) P0037 0037EC-890
HO2S2 HTR (B1) P0038 0038EC-890
HO2S2 HTR (B2) P0057 0057EC-890
HO2S2 HTR (B2) P0058 0058EC-890
HO2S2 (B1) P0137 0137EC-987
HO2S2 (B1) P0138 0138EC-998
HO2S2 (B1) P0139 0139EC-1011
HO2S2 (B2) P0157 0157EC-987
HO2S2 (B2) P0158 0158EC-998
HO2S2 (B2) P0159 0159EC-1011
I/C SOLENOID/CIRC P1752 1752AT-147
I/C SOLENOID FNCTN P1754 1754AT-149
IAT SEN/CIRCUIT P0112 0112EC-922
IAT SEN/CIRCUIT P0113 0113EC-922
IAT SENSOR P0127 0127EC-942
ICC COMMAND VALUE*6P1568 1568EC-1279
INT/V TIM CONT-B1 P0011 0011EC-870
INT/V TIM CONT-B2 P0021 0021EC-870
INT/V TIM V/CIR-B1 P0075 0075EC-899
INT/V TIM V/CIR-B2 P0081 0081EC-899
INTK TIM S/CIRC-B1 P1140 1140EC-1203
INTK TIM S/CIRC-B2 P1145 1145EC-1203
IN PULY SPEED P1715 1715EC-1301
ISC SYSTEM P0506 0506EC-1177
ISC SYSTEM P0507 0507EC-1179
KNOCK SEN/CIRC-B1 P0327 0327EC-1070
KNOCK SEN/CIRC-B1 P0328 0328EC-1070
KNOCK SEN/CIRC-B2 P0332 0332EC-1070
KNOCK SEN/CIRC-B2 P0333 0333EC-1070
L/PRESS SOL/CIRC P0745 0745AT-130
LC/B SOLENOID/CIRC P1772 1772AT-163
LC/B SOLENOID FNCT P1774 1774AT-165
MAF SEN/CIRCUIT P0101 0101EC-906
MAF SEN/CIRCUIT P0102 0102EC-915
MAF SEN/CIRCUIT P0103 0103EC-915
Items
(CONSULT-II screen terms)DTC*
1
Reference page
CONSULT-II
GST*
2ECM*3