Infiniti F50. Manual - part 359

TROUBLE DIAGNOSIS

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EC

DIAGNOSTIC WORKSHEET
Description

There are many operating conditions that lead to the malfunction of
engine components. A good grasp of such conditions can make trou-
bleshooting faster and more accurate.
In general, each customer feels differently about an incident. It is
important to fully understand the symptoms or conditions for a cus-
tomer complaint.
Utilize a diagnostic worksheet like the one on the next page in order
to organize all the information for troubleshooting.
Some conditions may cause the MIL to come on steady or blink and
DTC to be detected. Examples:

●

Vehicle ran out of fuel, which caused the engine to misfire.

●

Fuel filler cap was left off or incorrectly screwed on, allowing fuel
to evaporate into the atmosphere.

SEF907L

EC-78

TROUBLE DIAGNOSIS

Worksheet Sample

MTBL0017

TROUBLE DIAGNOSIS

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EC

DTC Inspection Priority Chart

EBS00LVW

If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
NOTE:
If DTC U1000 and/or U1001 is displayed with other DTC, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to 

EC-9, "INDEX FOR DTC"

 .

Priority

Detected items (DTC)

1

●

U1000 U1001 CAN communication line

●

P0101 P0102 P0103 P1102 Mass air flow sensor

●

P0112 P0113 P0127 Intake air temperature sensor

●

P0117 P0118 P0125 Engine coolant temperature sensor

●

P0122 P0123 P0222 P0223 P1225 P1226 P1229 P2135 Throttle position sensor

●

P0128 Thermostat function

●

P0181 P0182 P0183 Fuel tank temperature sensor

●

P0327 P0328 P0332 P0333 Knock sensor

●

P0335 Crankshaft position sensor (POS)

●

P0340 Camshaft position sensor (PHASE)

●

P0460 P0461 P0462 P0463 P1464 Fuel level sensor

●

P0500 Vehicle speed sensor

●

P0605 ECM

●

P0705 Park/Neutral position (PNP) switch

●

P1610 - P1615 NATS

●

P1706 Park/Neutral position (PNP) switch

●

P1716 Turbine revolution sensor

●

P2122 P2123 P2127 P2128 P2138 Accelerator pedal position sensor

EC-80

TROUBLE DIAGNOSIS

2

●

P0031 P0032 P0051 P0052 Heated oxygen sensor 1 heater

●

P0037 P0038 P0057 P0058 Heated oxygen sensor 2 heater

●

P0132 P0133 P0134 P0152 P0153 P0154 P1143 P1144 P1163 P1164 Heated oxygen sensor 1

●

P0138 P0139 P0158 P0159 P1146 P1147 P1166 P1167 Heated oxygen sensor 2

●

P0441 EVAP control system purge flow monitoring

●

P0444 P0445 P1444 EVAP canister purge volume control solenoid valve

●

P0447 P1446 P1448 EVAP canister vent control valve

●

P0452 P0453 EVAP control system pressure sensor

●

P0550 Power steering pressure sensor

●

P0650 MIL

●

P0710 P0720 P0740 P0744 P0745 P1720 P1730 P1752 P1754 P1757 P1759 P1762 P1764 P1767 P1769 P1772 
P1774 A/T related sensors, solenoid valves and switches

●

P1065 ECM power supply

●

P1111 P1136 Intake valve timing control solenoid valve

●

P1119 Radiator coolant temperature sensor

●

P1122 Electric throttle control function

●

P1124 P1126 P1128 Electric throttle control actuator

●

P1140 P1145 Intake valve timing control position sensor

●

P1220 Fuel pump control module

●

P1217 Engine over temperature (OVERHEAT)

●

P1480 Cooling fan speed control solenoid valve

●

P1490 P1491 Vacuum cut valve bypass valve

●

P1805 Brake switch

3

●

P0011 P0021 Intake valve timing control

●

P0171 P0172 P0174 P0175 Fuel injection system function

●

P0300 - P0308 Misfire

●

P0420 P0430 Three way catalyst function

●

P0442 P1442 EVAP control system (SMALL LEAK)

●

P0455 EVAP control system (GROSS LEAK)

●

P0456 P1456 (VERY SMALL LEAK)

●

P0506 P0507 Idle speed control system

●

P1121 Electric throttle control actuator

●

P1148 P1168 Closed loop control

●

P1211 ABS/TCS control unit

●

P1212 ABS/TCS communication line

●

P1780 Shift change signal

Priority

Detected items (DTC)