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Home >> Infiniti >> 2023 >> QX55 Essential >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (2 Of 3) >> Ecu Diagnosis Information >> ECM >> DTC Inspection Priority Chart
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DTC Inspection Priority Chart

If some DTCs are displayed at the same time, perform inspections one by one based on the following priority chart.

Priority

DTC

Detected items

1

C053C

Wheel speed sensor

U0101, U0122, U012E, U0146, U0155, U0142F, U1000, U1001, U10A0

CAN communication line

U1040, U1044

Engine communication line

U1050, U1051

LIN communication line

P0096, P0097, P0098

Intake air temperature sensor 2

P00B3, P00B4

Engine coolant temperature sensor 2

P0101, P0102, P0103

Mass air flow sensor

P0106

Turbocharger boost sensor

P010A

Manifold absolute pressure sensor

P0107, P0108

Barometric pressure sensor

P0111, P0112, P0113, P0127

Intake air temperature sensor

P0116, P0117, P0118, P0125

Engine coolant temperature sensor

P011C

Intake air temperature sensor

P0122, P0123, P0222, P0223, P1225, P1226, P2135

Throttle position sensor

P0181, P0182, P0183

Fuel tank temperature sensor

P0190, P0191, P0192, P0193, P119A, P119B, P119C

Fuel rail pressure sensor

P0196, P0197, P0198

Engine oil temperature sensor

P026B, P2B96

Injection system

P0326, P0327, P0328, P032B, P032C, P032D

Knock sensor

P0335, P2617, P2618, P2619

Crankshaft position sensor

P0340, P2614, P2615, P2616

Camshaft position sensor

P0365

Exhast valve timing position sensor

P0460, P0461, P0462, P0463

Fuel level sensor

P0500

Vehicle speed sensor

P0520

Engine oil pressure sensor

P0532, P0533

Refrigerant pressure sensor

P0544, P0545, P0546, P2080, P2081

Exhaust gas temperature sensor

P0603, P0604, P0605, P0606, P0607, P060A, P060B, P060C, P0611, P061B, P062B, P062F, P1603, P2610

ECM

P0641, P34C8

Electric intake valve timing control module

P0643

Sensor power supply

P06DA, P06DB

Engine oil pressure control solenoid valve

P0850

PNP switch

P1197

Out of gas *

P1550, P1551, P1552, P1553, P1554

Battery current sensor

P1556, P1557

Battery temperature sensor

P155D

Generator

P1568

Intelligent cruise control command value

P161D, P161E, P161F

IMMOBILIZER

P11A0, P11AA

VCR control

P2014, P2016, P2017, P2018

Intake manifold runner control valve position sensor

P2122, P2123, P2127, P2128, P2138

Accelerator pedal position sensor

P2562, P2563, P2564, P2565, P2566

Electric wastegate control valve position sensor

P26A5, P26A6, P26A7

Multi-way control valve position sensor

2

P0010

Electric intake valve timing control module

P0031, P0032

Air fuel ratio (A/F) sensor 1 heater

P0046

Electric wastegate control actuator

P0037, P0038, P0053, P00D2

Heated oxygen sensor 2 heater

P0078

Exhaust valve timing control solenoid valve

P0090

High pressure fuel pump

P00C0, P00C1, P00C2

Turbocharger bypass valve

P00FE

EVAP control system

P0130, P0131, P0132, P014C, P014D, P015A, P015B, P2096, P2097

Air fuel ratio (A/F) sensor 1

P0136, P0137, P0138, P0139, P2237, P2238, P2239, P2252, P2253, P2270, P2271, P2A01

Heated oxygen sensor 2

P0235, P0237, P0238

Turbocharger boost sensor

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, P0454

EVAP control system pressure sensor

P0531

Refrigerant pressure sensor

P1217

Engine over temperature (OVERHEAT)

P1575, P1805

Brake switch

P11A2, P11A3, P11A4, P11AB, P11AC, P11AD

VCR control

P2004

Intake manifold runner control valve position sensor

P2100, P2103

Throttle control motor relay

P2101

Electric throttle control function

P2118

Throttle control motor

P26A3

Multi-way control valve

P34AC, P34AD, P34AE, P34AF

Electric intake valve timing control actuator

3

P0011, P0012, P0016, P052A, P052B

Intake valve timing control

P0014, P0015, P0017

Exhaust valve timing control

P0087, P0088

Fuel pressure control

P0171, P0172, P21F4, P21F5

Port fuel injection system function

P0201, P0202, P0203, P0204, P21CF, P21D0, P21D1, P21D2, P21DB, P21DC, P21DE, P21DF, P21E0, P21E1, P21E2, P21E3, P23F2, P23F3, P23F4, P23F5, P23FE

Port fuel injector

P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P10C0, P10C1, P10C2, P10C3, P10C8, P10C9, P10CA, P10CB

Direct fuel injector

P0234, P2263

Turbocharger system

P025B

Fuel pressure control

P0300, P0301, P0302, P0303, P0304

Misfire

P0315

Crankshaft position

P0420

Three way catalyst function

P0456

EVAP control system

P0506, P0507

Idle speed control

P050A, P050B, P050E, P05EC, P2B95

Cold start control

P0524

Engine oil pressure

P0573, P1572

Brake pedal position switch

P0719

Stop lamp switch

P100C

Valve timing offset data not written

P1148

Closed loop control

P11A1, P11A6, P11A7, P11A8, P11A9, P11AE, P11AF

VCR control

P1212

TCS communication line

P1564

ICC/ProPILOT steering switch

P1574

ICC/ProPILOT vehicle speed sensor

P1715

Input speed sensor

P2119

Electric throttle control actuator

P219A, P219C, P219D, P219E

Air fuel ratio (A/F) sensor 1

*: If "P1197" is displayed with other DTC in priority 1, perform trouble diagnosis for "P1197" first.