Infiniti G37 Coupe. Manual — part 592
ECM
EC-549
< ECU DIAGNOSIS >
[VQ37VHR]
C
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EC
N
P
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DTC RELATED ITEM
Engine operating condi-
tion in fail-safe mode
Detected items
Remarks
Reference
page
Engine speed will not
rise more than 2,500 rpm
due to the fuel cut
Malfunction indicator
lamp circuit
When there is an open circuit on MIL circuit, the ECM cannot warn the
driver by lighting up MIL when there is malfunction on engine control
system.
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.
DTC No.
Detected items
Engine operating condition in fail-safe mode
U0113
U1003
U1011
U1024
Can communication circuit
VVEL actuator motor relay is turned off, and VVEL value is become at a minimam angle.
Engine speed will not rise more than 3,500 rpm due to the fuel cut.
P0011
P0021
Intake valve timing control
The signal is not energized to the intake valve timing control solenoid valve and the valve
control does not function.
P0102
P0103
P010C
P010D
Mass air flow sensor circuit
Engine speed will not rise more than 2,400 rpm due to the fuel cut.
P0117
P0118
Engine coolant tempera-
ture sensor circuit
Engine coolant temperature will be determined by ECM based on the following condition.
CONSULT-III displays the engine coolant temperature decided by ECM.
Condition
Engine coolant temperature decided
(CONSULT-III display)
Just as ignition switch is turned ON
or START
40
°
C (104
°
F)
Approx 4 minutes or more after en-
gine starting
80
°
C (176
°
F)
Except as shown above
40 - 80
°
C (104 - 176
°
F)
(Depends on the time)
When the fail-safe system for engine coolant temperature sensor is activated, the cooling
fan operates while engine is running.
P0122
P0123
P0222
P0223
P0227
P0228
P1239
P2132
P2133
P2135
Throttle position sensor
The ECM controls the electric throttle control actuator in regulating the throttle opening in
order for the idle position to be within +10 degrees.
The ECM regulates the opening speed of the throttle valve to be slower than the normal
condition.
So, the acceleration will be poor.
P0500
Vehicle speed sensor
When the fail-safe system for vehicle speed sensor is activated, the cooling fan operates
(Highest) while engine is running.
P0524
Engine oil pressure
The signal is not energized to the intake valve timing control solenoid valve and the valve
control does not function.
Engine speed will not rise more than 2,400 rpm due to the fuel cut.
P0605
ECM
(When ECM calculation function is malfunctioning:)
ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
ECM deactivates ASCD operation.
P0643
Sensor power supply
ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
EC-550
< ECU DIAGNOSIS >
[VQ37VHR]
ECM
DTC Inspection Priority Chart
INFOID:0000000001734350
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
P1087
P1088
VVEL control function
VVEL of normal bank is controlled at VVEL angle of abnormal bank.
Engine speed will not rise more than 3,500 rpm due to the fuel cut.
P1089
P1092
P1608
VVEL control shaft position
sensor
VVEL value is maintained at a fixed angle.
Engine speed will not rise more than 3,500 rpm due to the fuel cut
P1608
VVEL control shaft position
sensor
VVEL actuator motor relay is turned off, and VVEL value is become at a minimam angle.
Engine speed will not rise more than 3,500 rpm due to the fuel cut
P1090
P1093
VVEL actuator motor
VVEL of normal bank is controlled at VVEL angle of abnormal bank.
Engine speed will not rise more than 3,500 rpm due to the fuel cut.
VVEL actuator motor relay is turned off, and VVEL value is become at a minimam angle.
Engine speed will not rise more than 3,500 rpm due to the fuel cut.
P1091
VVEL actuator motor relay
VVEL actuator motor relay is turned off, and VVEL value is become at a minimam angle.
Engine speed will not rise more than 3,500 rpm due to the fuel cut.
P1233
P2101
Electric throttle control
function
ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P1236
P2118
Throttle control motor
ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P1238
P2119
Electric throttle control ac-
tuator
(When electric throttle control actuator does not function properly due to the return spring
malfunction:)
ECM controls the electric throttle actuator by regulating the throttle opening around the
idle position. The engine speed will not rise more than 2,000 rpm.
(When throttle valve opening angle in fail-safe mode is not in specified range:)
ECM controls the electric throttle control actuator by regulating the throttle opening to 20
degrees or less.
(When ECM detects the throttle valve is stuck open:)
While the vehicle is driving, it slows down gradually by fuel cut. After the vehicle stops, the
engine stalls.
The engine can restart in N or P position, and engine speed will not exceed 1,000 rpm or
more.
P1290
P2100
P2103
Throttle control motor relay
ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P1606
VVEL control module
VVEL actuator motor relay is turned off, and VVEL value is become at a minimam angle.
Engine speed will not rise more than 3,500 rpm due to the fuel cut.
P1805
Brake switch
ECM controls the electric throttle control actuator by regulating the throttle opening to a
small range.
Therefore, acceleration will be poor.
Vehicle condition
Driving condition
When engine is idling
Normal
When accelerating
Poor acceleration
P2122
P2123
P2127
P2128
P2138
Accelerator pedal position
sensor
The ECM controls the electric throttle control actuator in regulating the throttle opening in
order for the idle position to be within +10 degrees.
The ECM regulates the opening speed of the throttle valve to be slower than the normal
condition.
So, the acceleration will be poor.
DTC No.
Detected items
Engine operating condition in fail-safe mode
ECM
EC-551
< ECU DIAGNOSIS >
[VQ37VHR]
C
D
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F
G
H
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J
K
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M
A
EC
N
P
O
Priority
Detected items (DTC)
1
• U0113 U1003 CAN communication line
• U1000 U1001 CAN communication line
• U1010 CAN communication
• U1011 CAN communication
• U1024 VVEL CAN communication line
• P0101 P0102 P0103 P010B P010C P010D Mass air flow sensor
• P010A Manifold absolute pressure (MAP) sensor
• P0112 P0113 P0127 Intake air temperature sensor
• P0117 P0118 P0125 Engine coolant temperature sensor
• P0122 P0123 P0222 P0223 P0227 P0228 P1225 P1226 P1234 P1235 P1239 P2132 P2133 P2135 Throttle position sensor
• P0128 Thermostat function
• P0181 P0182 P0183 Fuel tank temperature sensor
• P0196 P0197 P0198 Engine oil temperature sensor
• P0327 P0328 P0332 P0333 Knock sensor
• P0335 Crankshaft position sensor (POS)
• P0340 P0345 Camshaft position sensor (PHASE)
• P0460 P0461 P0462 P0463 Fuel level sensor
• P0500 Vehicle speed sensor
• P0555 Brake booster pressure sensor
• P0605 ECM
• P0643 Sensor power supply
• P0700 TCM
• P0705 P0850 Park/neutral position (PNP) switch
• P1089 P1092 P1608 VVEL control shaft position sensor
• P1606 P1607 VVEL control module
• P0705 P0850 Park/neutral position (PNP) switch
• P1550 P1551 P1552 P1553 P1554 Battery current sensor
• P1610 - P1615 NATS
• P2122 P2123 P2127 P2128 P2138 Accelerator pedal position sensor
EC-552
< ECU DIAGNOSIS >
[VQ37VHR]
ECM
DTC Index
INFOID:0000000001734351
×
:Applicable —: Not applicable
2
• P0031 P0032 P0051 P0052 Air fuel ratio (A/F) sensor 1 heater
• P0037 P0038 P0057 P0058 Heated oxygen sensor 2 heater
• P0075 P0081 Intake valve timing control solenoid valve
• P0130 P0131 P0132 P0133 P0150 P0151 P0152 P0153 P2A00 P2A03 Air fuel ratio (A/F) sensor 1
• P0137 P0138 P0139 P0157 P0158 P0159 Heated oxygen sensor 2
• P0441 EVAP control system purge flow monitoring
• P0443 P0444 P0445 EVAP canister purge volume control solenoid valve
• P0447 P0448 EVAP canister vent control valve
• P0451 P0452 P0453 EVAP control system pressure sensor
• P0550 Power steering pressure sensor
• P0603 ECM power supply
• P0710 P0717 P0720 P0731 P0732 P0733 P0734 P0735 P0740 P0744 P0745 P1730 P1752 P1757 P1762 P1767 P1772
P1774 A/T related sensors, solenoid valves and switches
• P1087 P1088 VVEL system
• P1090 P1093 VVEL actuator motor
• P1091 VVEL actuator motor relay
• P1217 Engine over temperature (OVERHEAT)
• P1233 P2101 Electric throttle control function
• P1236 P2118 Throttle control motor
• P1290 P2100 P2103 Throttle control motor relay
• P1805 Brake switch
3
• P0011 P0021 Intake valve timing control
• P0171 P0172 P0174 P0175 Fuel injection system function
• P0300 - P0306 Misfire
• P0420 P0430 Three way catalyst function
• P0442 P0456 EVAP control system (SMALL LEAK, VERY SMALL LEAK)
• P0455 EVAP control system (GROSS LEAK)
• P0506 P0507 Idle speed control system
• P0524 Engine oil pressure
• P100A P100B VVEL system
• P1148 P1168 Closed loop control
• P1211 TCS control unit
• P1212 TCS communication line
• P1238 P2119 Electric throttle control actuator
• P1421 Cold start control
• P1564 ICC steering switch / ASCD steering switch
• P1568 ICC command value
• P1572 ICC brake switch / ASCD brake switch
• P1574 ICC vehicle speed sensor / ASCD vehicle speed sensor
• P1715 Turbine revolution sensor
Priority
Detected items (DTC)
DTC*
1
Items
(CONSULT-III screen terms)
SRT code
Trip
MIL
Reference
page
CONSULT-III
GST*
2
ECM*
3
U0113
0113
CAN COMM CIRCUIT
—
1 (A/T models)
2 (M/T models)
×
(A/T models)
— (M/T models)
U1000
1000*
4
CAN COMM CIRCUIT
—
1 (A/T models)
2 (M/T models)
×
(A/T models)
— (M/T models)
U1001
1001*
4
CAN COMM CIRCUIT
—
1 (with ASCD)
1 or 2 (with ICC)
—
U1003
1003
CAN COMM CIRCUIT
—
2
—
U1010
1010
CONTROL UNIT(CAN)
—
1 (A/T models)
2 (M/T models)
×
(A/T models)
— (M/T models)
U1011
1011
CONTROL UNIT (CAN)
—
1 (A/T models)
2 (M/T models)
×
(A/T models)
— (M/T models)
U1024
1024
VVEL CAN COMM CIRCUIT
—
1
×
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