2001 INFINITI QX4 Factory Service Manual

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Page 1145 of 2395

INFINITI QX4 2001 Factory Service Manual DescriptionNBEC0596SYSTEM DESCRIPTIONNBEC0596S01 Sensor Input Signal to ECMECM func- tionActuator Mass air flow sensor Amount of intake air VIAS con- trolVIAS control solenoid valve Throttle position

Page 1146 of 2395

INFINITI QX4 2001 Factory Service Manual SEF018Z COMPONENT DESCRIPTIONNBEC0596S02Power ValveNBEC0596S0201The power valve is installed in intake manifold collector and used to control the suction passage of the variable induction air control

Page 1147 of 2395

INFINITI QX4 2001 Factory Service Manual Wiring DiagramNBEC0597 MEC990C VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS) Wiring Diagram EC-612

Page 1148 of 2395

INFINITI QX4 2001 Factory Service Manual Diagnostic ProcedureNBEC0598 1 CHECK OVERALL FUNCTION With CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Perform ªVIAS SOL VALVEº in ªACTIVE TESTº mode with CONSULT

Page 1149 of 2395

INFINITI QX4 2001 Factory Service Manual 2 CHECK VIAS CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT 1. Stop engine. 2. Disconnect VIAS control solenoid valve harness connector. SEF019Z 3. Turn ignition switch ªONº. 4. Check voltage between t

Page 1150 of 2395

INFINITI QX4 2001 Factory Service Manual 5 RETEST OVERALL FUNCTION 1. Reconnect harness connectors disconnected. 2. Perform Test No. 1 again. OK or NG OK©INSPECTION END NG©GO TO 6. 6 CHECK INTERMITTENT INCIDENT Refer to ªTROUBLE DIAGNOSIS

Page 1151 of 2395

INFINITI QX4 2001 Factory Service Manual SEF375Z Component DescriptionNBEC0383The fuel injector is a small, precise solenoid valve. When the ECM supplies a ground to the injector circuit, the coil in the injector is energized. The energized

Page 1152 of 2395

INFINITI QX4 2001 Factory Service Manual Wiring DiagramNBEC0386 MEC974C GI MA EM LC FE AT TF PD AX SU BR ST RS BT HA SC EL IDX INJECTOR Wiring Diagram EC-617
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