Nissan Maxima QX

since 1993 of release

Repair and car operation

Check of a condition and replacement of the sensor of provision of a cranked shaft (SKR)

On models since 1995 вып. two SKR sensors, one of which (REF sensor) are used is established in a forward part of the power unit, on aluminum section of the pallet of a case of the engine, is direct under a pulley of a cranked shaft. Also serves for definition of quantity of grooves of the rotor sensor of a pulley of a cranked shaft in relation to positions VMT of the piston of each of cylinders (a signal 120 °). The second sensor (POS) also is on aluminum section of the pallet, but from the back party of the power unit, near a dome of transmission and serves for determination of frequency of rotation of a shaft (a signal 1 °). Both sensors consist of a constant magnet, the core and a wire winding. Change of a gap involves change of parameters of a magnetic field in close proximity to the sensor that, in turn leads to change of amplitude given out by the sensor on RSM of alarm tension. RSM uses information arriving from SKR sensors at corrections of installations of a corner of an advancing of ignition, synchronization of injection and detection of admissions of ignition.

CHECK

Performance described below procedure can lead to entering in memory of OBD of malfunction which will be highlighted by a control lamp “Check the engine”. On termination of check and the corresponding regenerative repair do not forget to clear memory of system (see. The section System of onboard diagnostics (OBD) - a principle of functioning and codes of malfunctions).

SKR REF sensor

PERFORMANCE ORDER

Disunite the socket of electroconducting of the sensor and connect an ohmmeter to contact plugs. At temperature 20°С demanded resistance makes 470 ÷ 570 Ohm. The faulty sensor is subject to replacement. If the result of measurement corresponds to nominal requirements, address to schemes of electric connections (see. Head Onboard electric equipment) also check serviceability of a condition of electroconducting on a chain site between the sensor and RSM. Make sure of lack of signs of violation of quality of grounding of a black wire of a plait of electroconducting of the sensor. If it is not possible to reveal any violations, the car should be driven away on car repair shop for carrying out diagnostics of a condition of RSM and performance of the corresponding regenerative repair.

SKR POS sensor

PERFORMANCE ORDER

1. Disconnect from the sensor electroconducting. Include ignition. make sure available tension of the battery on the plug of a red wire of the socket from a plait. If tension is absent, check an electroconducting condition on a chain site between the ECCS relay and the battery (do not forget to check first of all a condition of safety locks). Check serviceability of a condition of the ECCS relay and the electroconducting going from it to the sensor (see schemes of electric connections at the end of Head Onboard electric equipment). Make sure available tension amplitude in 5.0 In on the plug of a white wire. If tension is absent, check a chain condition on a site between RSM and the sensor. At a serviceable chain drive away the car on car repair shop for carrying out diagnostics of a condition of RSM and performance of the corresponding regenerative repair. Make sure also of lack of signs of violation of quality of grounding of a black wire of a plait.
2. Remove the sensor. Switch off ignition and connect to the sensor its electroconducting. Connect positive щуп the voltmeter to the plug of a black wire from a reverse side of the socket (more detailed than cm Head Onboard electric equipment). Negative щуп earth on weight. Include ignition. For an instant touch a sensor nouse with metal object (such as a screw-driver). At the moment of contact the voltmeter should register 5.0 V.Pri's indication metal assignment amplitude of a signal should reduce to zero quickly. The faulty sensor is subject to replacement. Remark: In rare instances violation of integrity of a gear wreath of a flywheel / a driving disk can appear the reason of introduction of a code of malfunction.

REPLACEMENT

PERFORMANCE ORDER

1. Disconnect from the sensor electroconducting.
2. Turn out a fixing bolt and remove the sensor. Installation is made upside-down.