Infiniti QX56 (JA60). Manual — part 456
EC-476
< ECU DIAGNOSIS >
[VK56DE]
ECM
1. If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once. Wait at least 10
seconds and then turn it ON (engine stopped) again.
2. Perform
TM-30, "OBD-II Diagnostic Trouble Code (DTC)"
. (The DTC in TCM will be erased)
3. Select Service $04 with GST (Generic Scan Tool).
No Tools
NOTE:
If the DTC is not for AT related items (see
1. If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once.
Wait at least 10 seconds and then turn it ON (engine stopped) again.
2. Perform
TM-30, "OBD-II Diagnostic Trouble Code (DTC)"
. (The DTC in the TCM will be erased.)
3. Change the diagnostic test mode from Mode II to Mode I by depressing the accelerator pedal. Refer to
EC-55, "Malfunction Indicator Lamp (MIL)"
• If the battery is disconnected, the emission-related diagnostic information will be lost within 24
hours.
• The following data are cleared when the ECM memory is erased.
- Diagnostic trouble codes
- 1st trip diagnostic trouble codes
- Freeze frame data
- 1st trip freeze frame data
- System readiness test (SRT) codes
- Test values
Actual work procedures are explained using a DTC as an example. Be careful so that not only the DTC, but all
of the data listed above, are cleared from the ECM memory during work procedures.
ENGINE CONTROL SYSTEM SYMPTOMS
EC-477
< SYMPTOM DIAGNOSIS >
[VK56DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
SYMPTOM DIAGNOSIS
ENGINE CONTROL SYSTEM SYMPTOMS
Symptom Matrix Chart
INFOID:0000000005149500
SYSTEM — BASIC ENGINE CONTROL SYSTEM
SYMPTOM
Refer-
ence page
HARD/NO ST
AR
T
/REST
AR
T
(EXCP
.
H
A
)
ENGINE ST
ALL
HESIT
A
TION/SURGING/FLA
T
SPOT
SP
ARK KNOCK/DET
O
NA
TION
LACK
OF POWER/
POOR
ACC
E
LERA
TION
HIGH IDL
E/LOW
IDLE
ROUG
H IDLE/HUNTING
IDLI
NG VIBRA
TION
SLOW
/NO RETURN T
O
IDLE
OVERHEA
T
S/W
A
TER TEMPERA
T
UR
E
HIGH
EXCESS
IVE F
U
E
L CONSUMP
T
IO
N
EXCESS
IVE OIL CONSUMP
T
ION
BA
TTER
Y
DEAD (UNDER CHARGE)
Warranty symptom code
AA
AB
AC
AD
AE
AF AG AH
AJ
AK
AL
AM HA
Fuel
Fuel pump circuit
1
1
2
3
2
2
2
3
2
Fuel pressure regulator system
3
3
4
4
4
4
4
4
4
4
Injector circuit
1
1
2
3
2
2
2
2
Evaporative emission system
3
3
4
4
4
4
4
4
4
4
Air
Positive crankcase ventilation sys-
tem
3
3
4
4
4
4
4
4
4
4
1
Incorrect idle speed adjustment
1
1
1
1
1
Electric throttle control actuator
1
1
2
3
3
2
2
2
2
2
2
,
,
,
Ignition
Incorrect ignition timing adjustment
3
3
1
1
1
1
1
1
Ignition circuit
1
1
2
2
2
2
2
2
Main power supply and ground circuit
2
2
3
3
3
3
3
2
3
EC-478
< SYMPTOM DIAGNOSIS >
[VK56DE]
ENGINE CONTROL SYSTEM SYMPTOMS
1 - 6: The numbers refer to the order of inspection.
(continued on next page)
SYSTEM — ENGINE MECHANICAL & OTHER
Mass air flow sensor circuit
1
1
2
2
2
2
2
2
,
Engine coolant temperature sensor circuit
3
3
3
,
Air fuel ratio (A/F) sensor 1 circuit
,
,
,
,
Throttle position sensor circuit
2
2
,
,
,
,
Accelerator pedal position sensor circuit
3
2
1
,
,
,
Knock sensor circuit
2
3
Crankshaft position sensor (POS) circuit
2
2
Camshaft position sensor (PHASE) circuit
3
2
Vehicle speed signal circuit
2
3
3
3
Power steering pressure sensor circuit
2
3
3
ECM
2
2
3
3
3
3
3
3
3
3
3
,
Intake valve timing control solenoid valve cir-
cuit
3
2
1
3
2
2
3
3
Park/Neutral position (PNP) signal circuit
3
3
3
3
3
Refrigerant pressure sensor circuit
2
3
3
4
Electrical load signal circuit
3
Air conditioner circuit
2
2
3
3
3
3
3
3
3
3
2
ABS actuator and electric unit (control unit)
4
SYMPTOM
Refer-
ence page
HARD/NO S
TA
R
T/RES
TA
R
T (E
XCP
. HA)
E
N
GINE
ST
ALL
HES
IT
A
TION/SURGING/FLA
T
SPOT
S
P
ARK KNOC
K
/DET
O
NA
TI
ON
LACK OF
POWER/POOR ACCELERA
TION
HIG
H
IDL
E
/L
OW
ID
LE
ROUGH IDLE/HUNTING
ID
LING VI
BRA
T
ION
S
LOW/NO RETU
RN
T
O ID
LE
OVERHEA
T
S
/W
A
TER TEMPERA
T
URE HIG
H
E
XCESSIVE
FUEL CON
S
UMP
T
ION
E
XCESSIVE
OIL
C
O
NSUMP
T
ION
B
A
TTER
Y
DEAD (UNDER CHARGE)
Warranty symptom code
AA
AB
AC
AD
AE
AF AG AH
AJ
AK
AL
AM HA
ENGINE CONTROL SYSTEM SYMPTOMS
EC-479
< SYMPTOM DIAGNOSIS >
[VK56DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
SYMPTOM
Reference
page
HARD/NO ST
AR
T/REST
AR
T (EXCP
.
HA)
E
N
GI
N
E
ST
AL
L
HESIT
A
TION/S
U
R
GING/F
LA
T SP
OT
SP
ARK KNOCK/DE
T
O
NA
TION
LACK OF POWE
R/POOR
ACCELERA
TIO
N
HIGH IDL
E/L
OW
IDL
E
ROUG
H IDLE/HU
NTING
IDL
ING VIBRA
T
ION
SLO
W
/NO RETURN T
O
IDLE
OVERHEA
T
S/W
A
TE
R
TEMPERA
T
URE
HIGH
EXCES
SIVE F
U
EL CONSUMP
T
ION
EXCES
SIVE OI
L CONSUMP
T
IO
N
BA
TTE
R
Y
DEAD (UN
D
E
R
CH
A
R
GE)
Warranty symptom code
AA
AB
AC
AD
AE
AF
AG AH
AJ
AK
AL
AM HA
Fuel
Fuel tank
5
5
Fuel piping
5
5
5
5
5
5
Vapor lock
—
Valve deposit
5
5
5
5
5
5
5
—
Poor fuel (Heavy weight gasoline,
Low octane)
—
Air
Air duct
5
5
5
5
5
5
Air cleaner
Air leakage from air duct
(Mass air flow sensor — electric
throttle control actuator)
5
5
5
5
Electric throttle control actuator
Air leakage from intake manifold/
Collector/Gasket
Cranking
Battery
1
1
1
1
1
1
1
1
Generator circuit
Starter circuit
3
Signal plate
6
Park/Neutral position (PNP) sig-
nal
4
Engine
Cylinder head
5
5
5
5
5
5
5
5
Cylinder head gasket
4
3
Cylinder block
6
6
6
6
6
6
6
6
4
Piston
Piston ring
Connecting rod
Bearing
Crankshaft
Valve
mecha-
nism
Timing chain
5
5
5
5
5
5
5
5
Camshaft
Intake valve timing control
Intake valve
3
Exhaust valve
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