2007 INFINITI M35 control unit

DTC P1574 ASCD VEHICLE SPEED SENSOR
EC-587
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Revision: 2007 April2007 M35/M45
Diagnostic ProcedureNBS0055L
1. CHECK DTC WITH TCM
Check DTC with TCM. Refer to AT- 4 0 , "
ON BOARD DIAGNOSTIC (OBD) SYSTEM" .
OK or NG
OK >> GO TO 2.
NG >> Perform trouble shooting relevant to DTC indicated.
2. CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”
Refer to BRC-10, "
TROUBLE DIAGNOSIS" .
OK or NG
OK >> GO TO 3.
NG >> Repair or replace.
3. CHECK DTC WITH “UNIFIED METER AND A/C AMP.”
Refer to DI-28, "
UNIFIED METER AND A/C AMP" .
>>INSPECTION END

FUEL PUMP
EC-675
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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-718
[VK45DE]
INDEX FOR DTC
Revision: 2007 April2007 M35/M45
[VK45DE]INDEX FOR DTCPFP:00024
DTC No. IndexNBS0059A
NOTE:

If DTC U1000 or U1001 is displayed with other DTC, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to EC-865, "
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-868, "
DTC U1010 CAN COMMUNICATION" .
DTC*1
Items
(CONSULT-II screen terms)Reference page
CONSULT-II
GST*
2ECM*3
U1000
1000*4CAN COMM CIRCUITEC-865
U1001
1001*4CAN COMM CIRCUITEC-865
U1010 1010 CONTROL UNIT(CAN)EC-868
P0000 0000NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.—
P0011 0011 INT/V TIM CONT-B1EC-870
P0021 0021 INT/V TIM CONT-B2EC-870
P0031 0031 A/F SEN1 HTR (B1)EC-883
P0032 0032 A/F SEN1 HTR (B1)EC-883
P0037 0037 HO2S2 HTR (B1)EC-890
P0038 0038 HO2S2 HTR (B1)EC-890
P0051 0051 A/F SEN1 HTR (B2)EC-883
P0052 0052 A/F SEN1 HTR (B2)EC-883
P0057 0057 HO2S2 HTR (B2)EC-890
P0058 0058 HO2S2 HTR (B2)EC-890
P0075 0075 INT/V TIM V/CIR-B1EC-899
P0081 0081 INT/V TIM V/CIR-B2EC-899
P0101 0101 MAF SEN/CIRCUITEC-906
P0102 0102 MAF SEN/CIRCUITEC-915
P0103 0103 MAF SEN/CIRCUITEC-915
P0112 0112 IAT SEN/CIRCUITEC-922
P0113 0113 IAT SEN/CIRCUITEC-922
P0117 0117 ECT SEN/CIRCEC-926
P0118 0118 ECT SEN/CIRCEC-926
P0122 0122 TP SEN 2/CIRCEC-932
P0123 0123 TP SEN 2/CIRCEC-932
P0125 0125 ECT SENSOREC-939
P0127 0127 IAT SENSOREC-942
P0128 0128 THERMSTAT FNCTNEC-945
P0130 0130 A/F SENSOR1 (B1)EC-947
P0131 0131 A/F SENSOR1 (B1)EC-957
P0132 0132 A/F SENSOR1 (B1)EC-966
P0133 0133 A/F SENSOR1 (B1)EC-975
P0137 0137 HO2S2 (B1)EC-987
P0138 0138 HO2S2 (B1)EC-998

INDEX FOR DTC
EC-723
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Revision: 2007 April2007 M35/M45CLOSED LOOP-B2 P1168 1168EC-1211
CMP SEN/CIRC-B1 P0340 0340EC-1082
CONTROL UNIT(CAN) U1010 1010EC-868
CTP LEARNING P1225 1225EC-1233
CTP LEARNING P1226 1226EC-1235
CYL 1 MISFIRE P0301 0301EC-1061
CYL 2 MISFIRE P0302 0302EC-1061
CYL 3 MISFIRE P0303 0303EC-1061
CYL 4 MISFIRE P0304 0304EC-1061
CYL 5 MISFIRE P0305 0305EC-1061
CYL 6 MISFIRE P0306 0306EC-1061
CYL 7 MISFIRE P0307 0307EC-1061
CYL 8 MISFIRE P0308 0308EC-1061
D/C SOLENOID/CIRC P1762 1762AT-155
D/C SOLENOID FNCTN P1764 1764AT-157
ECM P0605 0605EC-1190
ECM BACK UP/CIRCUIT P0603 0603EC-1186
ECT SEN/CIRC P0117 0117EC-926
ECT SEN/CIRC P0118 0118EC-926
ECT SENSOR P0125 0125EC-939
ENG OVER TEMP P1217 1217EC-1214
ETC ACTR P2119 2119EC-1334
ETC FUNCTION/CIRC P2101 2101EC-1322
ETC MOT P2118 2118EC-1329
ETC MOT PWR P2100 2100EC-1316
ETC MOT PWR P2103 2103EC-1316
EVAP GROSS LEAK P0455 0455EC-1153
EVAP PURG FLOW/MON P0441 0441EC-1095
EVAP SMALL LEAK P0442 0442EC-1100
EVAP SYS PRES SEN P0451 0451EC-1136
EVAP SYS PRES SEN P0452 0452EC-1139
EVAP SYS PRES SEN P0453 0453EC-1145
EVAP VERY SML LEAK P0456 0456EC-1160
FPCM/CIRCUIT P1220 1220EC-1225
FR/B SOLENOID/CIRC P1757 1757AT-151
FR/B SOLENOID FNCT P1759 1759AT-153
FTT SEN/CIRCUIT P0182 0182EC-1049
FTT SEN/CIRCUIT P0183 0183EC-1049
FTT SENSOR P0181 0181EC-1043
FUEL LEVEL SENSOR P0461 0461EC-1171
FUEL LEVL SEN/CIRC P0462 0462EC-1173
FUEL LEVL SEN/CIRC P0463 0463EC-1173
Items
(CONSULT-II screen terms)DTC*
1
Reference page
CONSULT-II
GST*
2ECM*3

PRECAUTIONS
EC-729
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Revision: 2007 April2007 M35/M45

B1 indicates the bank 1, B2 indicates the bank 2 as shown
in the figure.

Do not operate fuel pump when there is no fuel in lines.
–Fuel level sensor unit and fuel pump (1)
–Fuel pressure regulator (2)
–Fuel tank temperature sensor (3)

Tighten fuel hose clamps to the specified torque.

Do not depress accelerator pedal when starting.

Immediately after starting, do not rev up engine unneces-
sarily.

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 elec-
tronic control systems depending on installation location.
–Keep the antenna as far as possible from the electronic
control 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 radio can be kept smaller.
–Be sure to ground the radio to vehicle body.
PBIB1144E
PBIB2707E
SEF709Y
SEF708Y

ENGINE CONTROL SYSTEM
EC-733
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Revision: 2007 April2007 M35/M45
Multiport Fuel Injection (MFI) SystemNBS0059J
INPUT/OUTPUT SIGNAL CHART
*1: This sensor is not used to control the engine system under normal conditions.
*2: This signal is sent to the ECM through CAN communication line.
*3: ECM determines the start signal status by the signals of engine speed and battery voltage.
SYSTEM DESCRIPTION
The amount of fuel injected from the fuel injector is determined by the ECM. The ECM controls the length of
time the valve remains open (injection pulse duration). The amount of fuel injected is a program value in the
ECM memory. The program value is preset by engine operating conditions. These conditions are determined
by input signals (for engine speed and intake air) from the crankshaft position sensor (POS), camshaft position
sensor (PHASE) and the mass air flow sensor.
VARIOUS FUEL INJECTION INCREASE/DECREASE COMPENSATION
In addition, the amount of fuel injected is compensated to improve engine performance under various operat-
ing conditions as listed below.


During warm-up

When starting the engine

During acceleration

Hot-engine operation

When selector lever is changed from N to D

High-load, high-speed operation


During deceleration

During high engine speed operation
Sensor Input Signal to ECM ECM function Actuator
Crankshaft position sensor (POS)
Engine speed*
3
Piston position
Fuel injection
& mixture ratio
controlFuel injector Camshaft position sensor (PHASE)
Mass air flow sensor Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Air fuel ratio (A/F) sensor 1 Density of oxygen in exhaust gas
Throttle position sensor Throttle position
Accelerator pedal position sensor Accelerator pedal position
Park/neutral position (PNP) switch Gear position
Battery
Battery voltage*
3
Knock sensor Engine knocking condition
Power steering pressure sensor Power steering operation
Heated oxygen sensor 2*
1Density of oxygen in exhaust gas
ABS actuator and electric unit (control unit)
VDC/TCS operation command*
2
Air conditioner switch
Air conditioner operation*2
Wheel sensor
Vehicle speed*2

EC-740
[VK45DE]
CAN COMMUNICATION
Revision: 2007 April2007 M35/M45
CAN COMMUNICATIONPFP:23710
System DescriptionNBS0059Q
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
Refer to LAN-50, "
CAN System Specification Chart" , about CAN communication for detail.

ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-757
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Revision: 2007 April2007 M35/M45
Therefore, when electrical controlled throttle and part of ECM related diagnoses are continuously detected as
NG for 5 trips, ECM warns the driver that engine control system malfunctions and MIL circuit is open by means
of operating fail-safe function.
The fail-safe function also operates when above diagnoses except MIL circuit are detected and demands the
driver to repair the malfunction.
Emission-Related Diagnostic InformationNBS005A3
EMISSION-RELATED DIAGNOSTIC INFORMATION ITEMS
×:Applicable —: Not applicable Engine operating condition in fail-safe mode Engine speed will not rise more than 2,500 rpm due to the fuel cut
Items
(CONSULT-II screen terms)DTC*
1
SRT codeTest value/
Test limit
(GST only)Trip MILReference
page CONSULT-II
GST*
2ECM*3
CAN COMM CIRCUIT U1000
1000*4—— 1×EC-865
CAN COMM CIRCUIT U1001
1001*4— — 1 or 2 —EC-865
CONTROL UNIT(CAN) U1010 1010 — — 1×EC-868
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.P0000 0000———
Flashing*8—
INT/V TIM CONT-B1 P0011 0011 — — 2×EC-870
INT/V TIM CONT-B2 P0021 0021 — — 2×EC-870
A/F SEN1 HTR (B1) P0031 0031 —×2×EC-883
A/F SEN1 HTR (B1) P0032 0032 —×2×EC-883
HO2S2 HTR (B1) P0037 0037 —×2×EC-890
HO2S2 HTR (B1) P0038 0038 —×2×EC-890
A/F SEN1 HTR (B2) P0051 0051 —×2×EC-883
A/F SEN1 HTR (B2) P0052 0052 —×2×EC-883
HO2S2 HTR (B2) P0057 0057 —×2×EC-890
HO2S2 HTR (B2) P0058 0058 —×2×EC-890
INT/V TIM V/CIR-B1 P0075 0075 — — 2×EC-899
INT/V TIM V/CIR-B2 P0081 0081 — — 2×EC-899
MAF SEN/CIRCUIT P0101 0101 — — 2×EC-906
MAF SEN/CIRCUIT P0102 0102 — — 1×EC-915
MAF SEN/CIRCUIT P0103 0103 — — 1×EC-915
IAT SEN/CIRCUIT P0112 0112 — — 2×EC-922
IAT SEN/CIRCUIT P0113 0113 — — 2×EC-922
ECT SEN/CIRC P0117 0117 — — 1×EC-926
ECT SEN/CIRC P0118 0118 — — 1×EC-926
TP SEN 2/CIRC P0122 0122 — — 1×EC-932
TP SEN 2/CIRC P0123 0123 — — 1×EC-932
ECT SENSOR P0125 0125 — — 2×EC-939
IAT SENSOR P0127 0127 — — 2×EC-942
THERMSTAT FNCTN P0128 0128 — — 2×EC-945
A/F SENSOR1 (B1) P0130 0130 —×2×EC-947
A/F SENSOR1 (B1) P0131 0131 —×2×EC-957
A/F SENSOR1 (B1) P0132 0132 —×2×EC-966
A/F SENSOR1 (B1) P0133 0133××2×EC-975
HO2S2 (B1) P0137 0137××2×EC-987