Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2002 Infiniti Q45FACTORY OEM SERVICE PROCEDURE
Diagnostic Trouble Code Definitions
DIAGNOSTIC TROUBLE CODE DEFINITIONS
| DTC | CONSULT-II Display | System/Circuit Affected | ||||
|---|---|---|---|---|---|---|
| P0000 | ----- | No Malfunction/Normal Condition | ||||
| P0100 | MAF SEN/CIRCUIT | Mass Airflow Sensor | ||||
| P0105 | ABSL PRES SEN/CIRC | Absolute Pressure Sensor | ||||
| P0110 | AIR TEMP SEN/CIRC | Intake Air Temperature Sensor | ||||
| P0115 | COOLANT T SEN/CIRC | Engine Coolant Temperature Sensor | ||||
| P0120 | THRTL POS SEN/CIRC | Throttle Position Sensor | ||||
| P0121 | ACCEL POS SEN/CIRC | Accelerator Pedal Position Sensor | ||||
| P0125 | COOLANT T SEN/CIRC | Engine Coolant Temperature Sensor | ||||
| P0130 | HO2S1 (B1) | Left Front HO2S (Circuit) | ||||
| P0131 | HO2S1 (B1) | Left Front HO2S (Lean Shift) | ||||
| P0132 | HO2S1 (B1) | Left Front HO2S (Rich Shift) | ||||
| P0133 | HO2S1 (B1) | Left Front HO2S (Response Time) | ||||
| P0134 | HO2S1 (B1) | Left Front HO2S (High Voltage) | ||||
| P0135 | HO2S1 HTR (B1) | Left Front HO2S Heater | ||||
| P0137 | HO2S2 (B1) | Left Rear HO2S (Minimum Voltage) | ||||
| P0138 | HO2S2 (B1) | Left Rear HO2S (Maximum Voltage) | ||||
| P0139 | HO2S2 (B1) | Left Rear HO2S (Response Time) | ||||
| P0140 | HO2S2 (B1) | Left Rear HO2S (High Voltage) | ||||
| P0141 | HO2S2 HTR (B1) | Left Rear HO2S Heater | ||||
| P0150 | HO2S1 (B2) | Right Front HO2S (Circuit) | ||||
| P0151 | HO2S1 (B2) | Right Front HO2S (Lean Shift) | ||||
| P0152 | HO2S1 (B2) | Right Front HO2S (Rich Shift) | ||||
| P0153 | HO2S1 (B2) | Right Front HO2S (Response Time) | ||||
| P0154 | HO2S1 (B2) | Right Front HO2S (High Voltage) | ||||
| P0155 | HO2S1 HTR (B2) | Right Front HO2S Heater | ||||
| P0157 | HO2S2 (B2) | Right Rear HO2S (Minimum Voltage) | ||||
| P0158 | HO2S2 (B2) | Right Rear HO2S (Maximum Voltage) | ||||
| P0159 | HO2S2 (B2) | Right Rear HO2S (Response Time) | ||||
| P0160 | HO2S2 (B2) | Right Rear HO2S (High Voltage) | ||||
| P0161 | HO2S2 HTR (B2) | Right Rear HO2S Heater | ||||
| P0171 | FUEL SYS-LEAN/BK1 | Left Bank Fuel Injection System Function (Lean) | ||||
| P0172 | FUEL SYS-RICH/BK1 | Left Bank Fuel Injection System Function (Rich) | ||||
| P0174 | FUEL SYS-LEAN/BK2 | Right Bank Fuel Injection System Function (Lean) | ||||
| P0175 | FUEL SYS-RICH/BK2 | Right Bank Fuel Injection System Function (Rich) | ||||
| P0180 | FUEL TEMP SEN/CIRC | Fuel Tank Temperature Sensor | ||||
| P0300 | MULTI CYL MISFIRE | Multiple Cylinder Misfire | ||||
| P0301 | CYL 1 MISFIRE | Cylinder No. 1 Misfire | ||||
| P0302 | CYL 2 MISFIRE | Cylinder No. 2 Misfire | ||||
| P0303 | CYL 3 MISFIRE | Cylinder No. 3 Misfire | ||||
| P0304 | CYL 4 MISFIRE | Cylinder No. 4 Misfire | ||||
| P0305 | CYL 5 MISFIRE | Cylinder No. 5 Misfire | ||||
| P0306 | CYL 6 MISFIRE | Cylinder No. 6 Misfire | ||||
| P0307 | CYL 7 MISFIRE | Cylinder No. 7 Misfire | ||||
| P0308 | CYL 8 MISFIRE | Cylinder No. 8 Misfire | ||||
| P0325 (1) | KNOCK SEN/CIRC-B1 | Knock Sensor - Left Bank | ||||
| P0330 (1) | KNOCK SEN/CIRC-B2 | Knock Sensor - Right Bank | ||||
| P0335 | CKP SEN/CIRCUIT | Crankshaft Position Sensor (POS) | ||||
| P0340 | CMP SEN/CIRCUIT | Camshaft Position Sensor (PHASE) | ||||
| P0420 | TW CATALYST SYS-B1 | 3-Way Catalyst Function - Left Bank | ||||
| P0430 | TW CATALYST SYS-B2 | 3-Way Catalyst Function - Right Bank | ||||
| P0440 | EVAP SMALL LEAK | EVAP Control System (Small Leak) (Negative Pressure) | ||||
| P0443 | PURG VOLUME CONT/V | EVAP Canister Purge Volume Control Valve (Circuit) | ||||
| P0446 | VENT CONTROL VALVE | EVAP Canister Vent Control Valve (Circuit) | ||||
| P0450 | EVAP SYS PRES SEN | EVAP Control System Pressure Sensor | ||||
| P0455 | EVAP GROSS LEAK | EVAP Control System (Gross Leak) | ||||
| P0460 | FUEL LEV SEN SLOSH | Fuel Level Sensor Function (Slosh) | ||||
| P0461 | FUEL LEVEL SENSOR | Fuel Level Sensor Function | ||||
| P0464 | FUEL LEVL SEN/CIRC | Fuel Level Sensor Circuit | ||||
| P0500 | VEH SPEED SEN/CIRC | Vehicle Speed Sensor | ||||
| P0505 | ISC SYSTEM/FNCTN | Idle Speed Control System | ||||
| P0605 | ECM | ECM | ||||
| P0650 | MIL/CIRC | MIL (Circuit) | ||||
| P0705 | PNP SW/CIRC | (2) Park/Neutral Position Switch | ||||
| P0720 | VEH SPD SEN/CIR AT | (2) Vehicle Speed Sensor A/T (Revolution Sensor) | ||||
| P0740 | TCC SOLENOID/CIRC | (2) Torque Converter Clutch Solenoid Valve | ||||
| P0744 | A/T TCC S/V FNCTN | (2) Torque Converter Clutch Function (Lock-Up) | ||||
| P0745 | L/PRESS SOL/CIRC | (2) Line Pressure Solenoid Valve | ||||
| P1065 | ECM BACK UP/CIRC | ECM Power Supply (Back-Up) | ||||
| P1110 | INT/V TIM CONT-B1 | Intake Valve Timing Control - Left Bank | ||||
| P1111 | INT/V TIM V/CIR-B1 | Intake Valve Timing Control Solenoid Valve (Circuit) - Left Bank | ||||
| P1119 | RADI TEMP SEN/CIRC | Radiator Coolant Temperature Sensor (Circuit) | ||||
| P1121 | ETC ACTR | Electric Throttle Control Actuator | ||||
| P1122 | ETC FUNCTION/CIRC | Electric Throttle Control Function (Circuit) | ||||
| P1123 | ETC MOT RLY/CIRC | Throttle Control Motor Relay (Circuit) | ||||
| P1135 | INT/V TIM CONT-B2 | Intake Valve Timing Control - Right Bank | ||||
| P1136 | INT/V TIM V/CIR-B2 | Intake Valve Timing Control Solenoid Valve (Circuit) - Right Bank | ||||
| P1140 | INTK TIM S/CIRC-B1 | Intake Valve Timing Control Position Sensor (Circuit) - Left Bank | ||||
| P1145 | INTK TIM S/CIRC-B2 | Intake Valve Timing Control Position Sensor (Circuit) - Right Bank | ||||
| P1148 | CLOSED LOOP-B1 | Closed Loop Control - Left Bank | ||||
| P1168 | CLOSED LOOP-B2 | Closed Loop Control - Right Bank | ||||
| P1211 | TCS C/U FUNCTN | VDC/TCS/ABS Control Unit | ||||
| P1212 | TCS/CIRC | VDC/TCS/ABS Communication Line | ||||
| P1220 | FPCM/CIRCUIT | Fuel Pump Control Module | ||||
| P1320 | IGN SIGNAL-PRIMARY | Ignition Signal | ||||
| P1336 | CKP SENSOR (COG) | Crankshaft Position Sensor (POS) | ||||
| P1440 | EVAP SMALL LEAK | EVAP Control System (Small Leak) (Positive Pressure) | ||||
| P1444 | PURG VOLUME CONT/V | EVAP Canister Purge Volume Control Valve | ||||
| P1446 | VENT CONTROL VALVE | EVAP Canister Vent Control Valve (Close) | ||||
| P1447 | EVAP PURG FLOW/MON | EVAP Control System Purge Flow Monitoring | ||||
| P1448 | VENT CONTROL VALVE | EVAP Canister Vent Control Valve (Open) | ||||
| P1464 | FUEL LEVL SEN/CIRC | Fuel Level Sensor Circuit (Ground Signal) | ||||
| P1480 | FAN CONT S/V CIRC | Cooling Fan Speed Control Solenoid Valve (Circuit) | ||||
| P1490 | VC/V BYPASS/V | Vacuum Cut Valve By-Pass Valve (Circuit) | ||||
| P1491 | VC CUT/V BYPASS/V | Vacuum Cut Valve By-Pass Valve | ||||
| P1605 | A/T DIAG COMM LINE | A/T Diagnosis Communication Line | ||||
| P1706 | P-N POS SW/CIRCUIT | Park/Neutral Position Switch | ||||
| P1710 | ATF TEMP SEN/CIRC | (2) A/T Fluid Temperature Sensor Circuit | ||||
| P1716 | TURBINE REV S/CIRC | (2) Turbine Revolution Sensor | ||||
| P1720 | V/SP SEN (A/T OUT) | Vehicle Speed Sensor (A/T Output) | ||||
| P1730 | A/T INTERLOCK | (2) A/T Interlock | ||||
| P1752 | I/C SOLENOID/CIRC | (2) Input Clutch Solenoid Valve | ||||
| P1754 | I/C SOLENOID FNCTN | (2) Input Clutch Solenoid Valve Function | ||||
| P1757 | FR/B SOLENOID/CIRC | (2) Front Brake Solenoid Valve | ||||
| P1759 | FR/B SOLENOID FNCT | (2) Front Brake Solenoid Valve Function | ||||
| P1762 | D/C SOLENOID/CIRC | (2) Direct Clutch Solenoid Valve | ||||
| P1764 | D/C SOLENOID FNCTN | (2) Direct Clutch Solenoid Valve Function | ||||
| P1767 | HLR/C SOL/CIRC | (2) High & Low Reverse Clutch Solenoid Valve | ||||
| P1769 | HLR/C SOL FNCTN | (2) High & Low Reverse Clutch Solenoid Valve Function | ||||
| P1772 | LC/B SOLENOID/CIRC | (2) High & Low Reverse Clutch Solenoid Valve | ||||
| P1774 | LC/B SOLENOID FNCT | (2) High & Low Reverse Clutch Solenoid Valve Function | ||||
| P1780 | SHIFT SIG FNCTN | Shift Change Signal | ||||
| P1805 | BRAKE SW/CIRCUIT | Brake Switch | ||||
| U1000 | CAN COMM CIRCUIT | CAN Communication Line | ||||
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Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.