Manual

Nissan/Infiniti
FAULT CODE DEFINITIONS (11 - 51)
Chapter 4 34
NISSAN/INFINITI FAULT CODE DEFINITIONS
IMPORTANT: Retrieving and utilizing Diagnostic Trouble
Codes (DTCs) for troubleshooting vehicle operation problems is
only one part of an overall diagnostic strategy. Never replace a
part based solely on the DTC definition. Always consult the
vehicle’s service manual for more detailed testing instructions.
Each DTC has a set of testing procedures, instructions and flow
charts that must be followed to confirm the exact location of the
problem. This type of information is found in the vehicle’s
service manual.
Code Description Possible Cause
11 CKP sensor circuit CKP sensor or circuit
12 MAF sensor circuit MAF sensor or circuit, MAF signal
too high
13 ECT sensor circuit ECT sensor or circuit
14 VSS circuit VSS or circuit
16 Traction Control System Open or shorted signal circuit
21 No ignition reference pulse Loss of primary signal
22 Fuel Pump / Idle speed control valve Open or shorted signal circuit
23 Idle switch / throttle valve switch Open or shorted signal circuit /
defective idle speed valve
24 Idle switch / Trans. switch / Open or shorted signal circuit
Neutral/Park switch
25 Idle Speed control Open or shorted AAC circuit
31 ECU circuit Abnormal input signals
32 EGR sensor circuit No EGR operation
33 HO2S fault Open or shorted signal circuit,
high HO2S signal
34 Knock Sensor circuit Knock sensor or circuit
35 EGR temperature sensor EGR temperature sensor or circuit
36 EGR valve / system EGR / EVAP valve or circuit
37 Closed loop control HO2S, intake/fuel system
41 Air temperature sensor Air temperature sensor or circuit
42 Fuel temperature sensor Fuel temperature sensor or circuit
43 TPS circuit TPS or circuit
44 No faults / no malfunctions
45 Injector leak Leak at injector
46 Secondary TPS circuit Secondary TPS or circuit
51 Injector circuit Defective injector