Infiniti Q45. Manual — part 352
ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-47
C
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EC
ON BOARD DIAGNOSTIC (OBD) SYSTEM
PFP:00028
Introduction
NBS002WA
The ECM has an on board diagnostic system, which detects malfunctions related to engine sensors or actua-
tors. The ECM also records various emission-related diagnostic information including:
The above information can be checked using procedures listed in the table below.
×
: Applicable
—: Not applicable
*: When DTC and 1st trip DTC simultaneously appear on the display, they cannot be clearly distinguished from each other.
The malfunction indicator lamp (MIL) on the instrument panel lights up when the same malfunction is detected
in two consecutive trips (Two trip detection logic), or when the ECM enters fail-safe mode. (Refer to
Two Trip Detection Logic
NBS002WB
When a malfunction is detected for the first time, 1st trip DTC and 1st trip Freeze Frame data are stored in the
ECM memory. The MIL will not light up at this stage. <1st trip>
If the same malfunction is detected again during the next drive, the DTC and Freeze Frame data are stored in
the ECM memory, and the MIL lights up. The MIL lights up at the same time when the DTC is stored. <2nd
trip> The “trip” in the “Two Trip Detection Logic” means a driving mode in which self-diagnosis is performed
during vehicle operation. Specific on board diagnostic items will cause the ECM to light up or blink the MIL,
and store DTC and Freeze Frame data, even in the 1st trip, as shown below.
×
: Applicable
—: Not applicable
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.
Emission-related diagnostic information
Diagnostic service
Diagnostic Trouble Code (DTC)
Service $03 of SAE J1979
Freeze Frame data
Service $02 of SAE J1979
System Readiness Test (SRT) code
Service $01 of SAE J1979
1st Trip Diagnostic Trouble Code (1st Trip DTC)
Service $07 of SAE J1979
1st Trip Freeze Frame data
Test values and Test limits
Service $06 of SAE J1979
Calibration ID
Service $09 of SAE J1979
DTC
1st trip DTC
Freeze
Frame data
1st trip Freeze
Frame data
SRT code
SRT status
Test value
CONSULT-II
×
×
×
×
×
×
—
GST
×
×
×
—
×
×
×
ECM
×
×
*
—
—
—
×
—
Items
MIL
DTC
1st trip DTC
1st trip
2nd trip
1st trip
displaying
2nd trip
displaying
1st trip
displaying
2nd trip
display-
ing
Blinking
Lighting
up
Blinking
Lighting
up
Misfire (Possible three way cata-
lyst damage) — DTC: P0300 -
P0308 is being detected
×
—
—
—
—
—
×
—
Misfire (Possible three way cata-
lyst damage) — DTC: P0300 -
P0308 is being detected
—
—
×
—
—
×
—
—
One trip detection diagnoses
(Refer to
RELATED DIAGNOSTIC INFOR-
MATION ITEMS"
.)
—
×
—
—
×
—
—
—
Except above
—
—
—
×
—
×
×
—
EC-48
ON BOARD DIAGNOSTIC (OBD) 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.
Emission-related Diagnostic Information
NBS002WC
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 code
Test value/
Test limit
(GST only)
Trip
MIL
Reference
page
CONSULT-II
GST*
2
ECM*
3
CAN COMM CIRCUIT
U1000
1000*
4
—
—
1
×
CAN COMM CIRCUIT
U1001
1001*
4
—
—
2
—
CONTROL UNIT(CAN)
U1010
1010
—
—
1
×
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.
P0000
0000
—
—
—
Flashing*
8
—
INT/V TIM CONT-B1
P0011
0011
—
—
2
×
INT/V TIM CONT-B2
P0021
0021
—
—
2
×
A/F SEN1 HTR (B1)
P0031
0031
—
×
2
×
A/F SEN1 HTR (B1)
P0032
0032
—
×
2
×
HO2S2 HTR (B1)
P0037
0037
—
×
2
×
HO2S2 HTR (B1)
P0038
0038
—
×
2
×
A/F SEN1 HTR (B2)
P0051
0051
—
×
2
×
A/F SEN1 HTR (B2)
P0052
0052
—
×
2
×
HO2S2 HTR (B2)
P0057
0057
—
×
2
×
HO2S2 HTR (B2)
P0058
0058
—
×
2
×
INT/V TIM V/CIR-B1
P0075
0075
—
—
2
×
INT/V TIM V/CIR-B2
P0081
0081
—
—
2
×
MAF SEN/CIRCUIT
P0101
0101
—
—
2
×
MAF SEN/CIRCUIT
P0102
0102
—
—
1
×
MAF SEN/CIRCUIT
P0103
0103
—
—
1
×
IAT SEN/CIRCUIT
P0112
0112
—
—
2
×
IAT SEN/CIRCUIT
P0113
0113
—
—
2
×
ECT SEN/CIRC
P0117
0117
—
—
1
×
ECT SEN/CIRC
P0118
0118
—
—
1
×
TP SEN 2/CIRC
P0122
0122
—
—
1
×
TP SEN 2/CIRC
P0123
0123
—
—
1
×
ECT SENSOR
P0125
0125
—
—
2
×
IAT SENSOR
P0127
0127
—
—
2
×
THERMSTAT FNCTN
P0128
0128
—
—
2
×
A/F SENSOR1 (B1)
P0130
0130
—
×
2
×
A/F SENSOR1 (B1)
P0131
0131
—
×
2
×
A/F SENSOR1 (B1)
P0132
0132
—
×
2
×
A/F SENSOR1 (B1)
P0133
0133
×
×
2
×
HO2S2 (B1)
P0137
0137
×
×
2
×
ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-49
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HO2S2 (B1)
P0138
0138
×
×
2
×
HO2S2 (B1)
P0139
0139
×
×
2
×
A/F SENSOR1 (B2)
P0150
0150
—
×
2
×
A/F SENSOR1 (B2)
P0151
0151
—
×
2
×
A/F SENSOR1 (B2)
P0152
0152
—
×
2
×
A/F SENSOR1 (B2)
P0153
0153
×
×
2
×
HO2S2 (B2)
P0157
0157
×
×
2
×
HO2S2 (B2)
P0158
0158
×
×
2
×
HO2S2 (B2)
P0159
0159
×
×
2
×
FUEL SYS-LEAN-B1
P0171
0171
—
—
2
×
FUEL SYS-RICH-B1
P0172
0172
—
—
2
×
FUEL SYS-LEAN-B2
P0174
0174
—
—
2
×
FUEL SYS-RICH-B2
P0175
0175
—
—
2
×
FTT SENSOR
P0181
0181
—
—
2
×
FTT SEN/CIRCUIT
P0182
0182
—
—
2
×
FTT SEN/CIRCUIT
P0183
0183
—
—
2
×
TP SEN 1/CIRC
P0222
0222
—
—
1
×
TP SEN 1/CIRC
P0223
0223
—
—
1
×
MULTI CYL MISFIRE
P0300
0300
—
—
2
×
CYL 1 MISFIRE
P0301
0301
—
—
2
×
CYL 2 MISFIRE
P0302
0302
—
—
2
×
CYL 3 MISFIRE
P0303
0303
—
—
2
×
CYL 4 MISFIRE
P0304
0304
—
—
2
×
CYL 5 MISFIRE
P0305
0305
—
—
2
×
CYL 6 MISFIRE
P0306
0306
—
—
2
×
CYL 7 MISFIRE
P0307
0307
—
—
2
×
CYL 8 MISFIRE
P0308
0308
—
—
2
×
KNOCK SEN/CIRC-B1
P0327
0327
—
—
2
—
KNOCK SEN/CIRC-B1
P0328
0328
—
—
2
—
KNOCK SEN/CIRC-B2
P0332
0332
—
—
2
—
KNOCK SEN/CIRC-B2
P0333
0333
—
—
2
—
CKP SEN/CIRCUIT
P0335
0335
—
—
2
×
CMP SEN/CIRC-B1
P0340
0340
—
—
2
×
TW CATALYST SYS-B1
P0420
0420
×
×
2
×
TW CATALYST SYS-B2
P0430
0430
×
×
2
×
EVAP PURG FLOW/MON
P0441
0441
×
×
2
×
EVAP SMALL LEAK
P0442
0442
×
×
2
×
PURG VOLUME CONT/V
P0443
0443
—
—
2
×
PURG VOLUME CONT/V
P0444
0444
—
—
2
×
PURG VOLUME CONT/V
P0445
0445
—
—
2
×
VENT CONTROL VALVE
P0447
0447
—
—
2
×
VENT CONTROL VALVE
P0448
0448
—
—
2
×
Items
(CONSULT-II screen terms)
DTC*
1
SRT code
Test value/
Test limit
(GST only)
Trip
MIL
Reference
page
CONSULT-II
GST*
2
ECM*
3
EC-50
ON BOARD DIAGNOSTIC (OBD) SYSTEM
EVAP SYS PRES SEN
P0452
0452
—
—
2
×
EVAP SYS PRES SEN
P0453
0453
—
—
2
×
EVAP GROSS LEAK
P0455
0455
—
—
2
×
EVAP VERY SML LEAK
P0456
0456
×
*
7
×
2
×
FUEL LEV SEN SLOSH
P0460
0460
—
—
2
×
FUEL LEVEL SENSOR
P0461
0461
—
—
2
×
FUEL LEVL SEN/CIRC
P0462
0462
—
—
2
×
FUEL LEVL SEN/CIRC
P0463
0463
—
—
2
×
VEH SPEED SEN/CIRC*
5
P0500
0500
—
—
2
×
ISC SYSTEM
P0506
0506
—
—
2
×
ISC SYSTEM
P0507
0507
—
—
2
×
PW ST P SEN/CIRC
P0550
0550
—
—
2
—
ECM BACK UP/CIRCUIT
P0603
0603
—
—
2
×
ECM
P0605
0605
—
—
1 or 2
×
or —
SENSOR POWER/CIRC
P0643
0643
—
—
1
×
TCM
P0700
0700
—
—
1
×
PNP SW/CIRC
P0705
0705
—
—
2
×
ATF TEMP SEN/CIRC
P0710
0710
—
—
2
×
TURBINE SENSOR
P0717
0717
—
—
2
×
VEH SPD SEN/CIR AT*
5
P0720
0720
—
—
2
×
TCC SOLENOID/CIRC
P0740
0740
—
—
2
×
A/T TCC S/V FNCTN
P0744
0744
—
—
2
×
L/PRESS SOL/CIRC
P0745
0745
—
—
2
×
P-N POS SW/CIRCUIT
P0850
0850
—
—
2
×
INTK TIM S/CIRC-B1
P1140
1140
—
—
2
×
INTK TIM S/CIRC-B2
P1145
1145
—
—
2
×
CLOSED LOOP-B1
P1148
1148
—
—
1
×
CLOSED LOOP-B2
P1168
1168
—
—
1
×
TCS C/U FUNCTN
P1211
1211
—
—
2
—
TCS/CIRC
P1212
1212
—
—
2
—
ENG OVER TEMP
P1217
1217
—
—
1
×
FPCM/CIRCUIT
P1220
1220
—
—
2
×
CTP LEARNING
P1225
1225
—
—
2
—
CTP LEARNING
P1226
1226
—
—
2
—
EVAP SMALL LEAK
P1442
1442
×
×
2
×
EVAP VERY SML LEAK
P1456
1456
×
*
7
×
2
×
VC/V BYPASS/V
P1490
1490
—
—
2
×
VC CUT/V BYPASS/V
P1491
1491
—
—
2
×
Items
(CONSULT-II screen terms)
DTC*
1
SRT code
Test value/
Test limit
(GST only)
Trip
MIL
Reference
page
CONSULT-II
GST*
2
ECM*
3
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