2001 INFINITI QX4 Factory Service Manual

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Page 2297 of 2395

INFINITI QX4 2001 Factory Service Manual 4 CHECK INPUT SIGNAL With CONSULT-II 1. Start engine. 2. Select ªECU INPUT SIGNALSº in Data Monitor. 3. Read out the value of ªVEHICLE SPEED SENSOR (FRONT)º while driving. SMT773D SMT974D 4. Check

Page 2298 of 2395

INFINITI QX4 2001 Factory Service Manual 5 CHECK INPUT SIGNAL Without CONSULT-II 1. Start engine. 2. Check voltage between transfer control unit harness connector terminals 38 and 28. (Measure it in AC range.) Voltage: 0 km/h (0 MPH): 0V 30

Page 2299 of 2395

INFINITI QX4 2001 Factory Service Manual Diagnostic ProcedureNBTF0020 1 CHECK 4WD SOLENOID VALVE SMT775D Refer to ª4WD Solenoid Valve, Clutch Pressure Switch and Line Pressure Switchº, ªCOMPONENT INSPECTIONº, TF-111. OK or NG OK©GO TO 2

Page 2300 of 2395

INFINITI QX4 2001 Factory Service Manual 3 CHECK POWER SOURCE CIRCUIT 1. Turn ignition switch to ªOFFº position. 2. Check continuity between transfer terminal cord assembly sub-harness connector terminal 6 and transfer control unit harness

Page 2301 of 2395

INFINITI QX4 2001 Factory Service Manual Diagnostic ProcedureNBTF0021 1 CHECK 2-4WD SHIFT SOLENOID VALVE AND 4WD SHIFT SWITCH Refer to ª2-4WD Shift Solenoid Valve and Transfer Fluid Temperature Sensorº, ªCOMPONENT INSPECTIONº, TF-111. SM

Page 2302 of 2395

INFINITI QX4 2001 Factory Service Manual 2 CHECK INPUT SIGNAL With CONSULT-II 1. Select ªECU INPUT SIGNALSº in Data Monitor. 2. Read out ON/OFF status of ª2WD SWº and ªLOCK SWITCHº. SMT974D OK or NG OK©1. Perform transfer control unit

Page 2303 of 2395

INFINITI QX4 2001 Factory Service Manual 3 CHECK 4WD SHIFT SWITCH POWER SOURCE 1. Disconnect 4WD shift switch harness connector. 2. Turn ignition switch to ªONº position. 3. Check voltage between 4WD shift switch harness connector terminal

Page 2304 of 2395

INFINITI QX4 2001 Factory Service Manual 4 CHECK HARNESS CONTINUITY 1. Turn ignition switch to ªOFFº position. 2. Check continuity between the following terminals: ITransfer control unit 9 and 4WD shift switch 2 (2WD) ITransfer control uni
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