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System - Basic Engine Control System

WARNING: This page is about a different car, the 2005 Nissan Xterra. However, it is still accessible from the selected car via links, so may be relevant.
SYMPTOM MATRIX CHART

SYMPTOM Refer to
HARD/NO START/RESTART (EXCP. HA) ENGINE STALL HESITATION/SURGING/FLAT SPOT SPARK KNOCK/DETONATION LACK OF POWER/POOR ACCELERATION HIGH IDLE/LOW IDLE ROUGH IDLE/HUNTING IDLING VIBRATION SLOW/NO RETURN TO IDLE OVERHEATS/WATER TEMPERATURE HIGH EXCESSIVE FUEL CONSUMPTION EXCESSIVE OIL CONSUMPTION BATTERY 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 PUMP CIRCUIT
Fuel pressure regulator system 3 3 4 4 4 4 4 4 4   4     DIAGNOSTIC PROCEDURE 
Injector circuit 1 1 2 3 2   2 2     2     INJECTOR CIRCUIT
Evaporative emission system 3 3 4 4 4 4 4 4 4   4     CAN COMMUNICATION 
Air Positive crankcase ventilation system 3 3 4 4 4 4 4 4 4   4 1   POSITIVE CRANKCASE VENTILATION 
Incorrect idle speed adjustment       1 1 1 1   1     BASIC SERVICE PROCEDURE 
Electric throttle control actuator 1 1 2 3 3 2 2 2 2   2   2 DTC P1121 ELECTRIC THROTTLE CONTROL ACTUATOR , DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION
Ignition Incorrect ignition timing adjustment 3 3 1 1 1   1 1     1     BASIC SERVICE PROCEDURE 
Ignition circuit 1 1 2 2 2   2 2     2     IGNITION SIGNAL
Power supply and ground circuit 2 2 3 3 3   3 3   2 3     POWER SUPPLY AND GROUND CIRCUIT 
Mass air flow sensor circuit 1 1 2 2 2   2 2     2     DTC P0101 MAF SENSOR , DTC P0102, P0103 MAF SENSOR
Engine coolant temperature sensor circuit 3 3 3       DTC P0117, P0118 ECT SENSOR , DTC P0125 ECT SENSOR
Air fuel ratio (A/F) sensor 1 circuit             DTC P1271, P1281 A/F SENSOR 1 , DTC P1272, P1282 A/F SENSOR 1 , DTC P1273, P1283 A/F SENSOR 1 , DTC P1274, P1284 A/F SENSOR 1 , DTC P1276, P1286 A/F SENSOR 1 , DTC P1278, P1288 A/F SENSOR 1 , DTC P1279, P1289 A/F SENSOR 1
Throttle position sensor circuit     2 2       DTC P0122, P0123 TP SENSOR , DTC P0222, P0223 TP SENSOR , DTC P1225 TP SENSOR , DTC P1226 TP SENSOR , DTC P2135 TP SENSOR
Accelerator pedal position sensor circuit     3 2 1             DTC P1229 SENSOR POWER SUPPLY , DTC P2122, P2123 APP SENSOR , DTC P2127, P2128 APP SENSOR , DTC P2138 APP SENSOR
Knock sensor circuit     2               3     DTC P0327, P0328, P0332, P0333 KS
Crankshaft position sensor (POS) circuit 2 2                       DTC P0335 CKP SENSOR (POS)
Camshaft position sensor (PHASE) circuit 3 2                       DTC P0340, P0345 CMP SENSOR (PHASE)
Vehicle speed signal circuit   2 3   3           3     COMPONENT INSPECTION
Power steering pressure sensor circuit   2         3 3           DTC P0550 PSP SENSOR
ECM 2 2 3 3 3 3 3 3 3 3 3     DTC P0605 ECM , DTC P1065 ECM POWER SUPPLY
Intake valve timing control solenoid valve circuit   3 2   1 3 2 2 3   3     DTC P1111, P1136 IVT CONTROL SOLENOID VALVE
PNP switch circuit     3   3   3 3     3     DTC P1706 PNP SWITCH PFP:32006
VIAS control solenold valve circuit         1                 DTC P1800 VIAS CONTROL SOLENOID VALVE
Refrigerant pressure sensor circuit   2       3     3   4     REFRIGERANT PRESSURE SENSOR
Electrical load signal circuit             3             ELECTRICAL LOAD SIGNAL
Air conditioner circuit 2 2 3 3 3 3 3 3 3   3   2 TROUBLE DIAGNOSIS
ABS actuator and electric unit (control unit)     4                     TROUBLE DIAGNOSIS , TROUBLE DIAGNOSIS , TROUBLE DIAGNOSIS , TROUBLE DIAGNOSIS

1 - 6: The numbers refer to the order of inspection.