Nissan cars bearing A32 is equipped with automatic transmission RE4F04A. In the maintenance process is often overlooked because of some places to a problem. Here's a few failures with examples, Talking about experience, you peer reference purposes only.
Failure 1: Nanjing Arts training bodies bearing a A32 Nissan cars occasionally can not shift, lock a file, speed is only 30 km / hour. Parking off the ignition switch a few minutes and then start the engine, gearbox and can restore work.
First, consider the transmission control computer itself has a soft intermittent fault it? with sensor failure (A / T on). passed the road test diagnosis, Thinking of diagnosis, found that road test, a few minutes about a sudden drop down the speed from the The road through multiple test results are the same. is failure is clear. is the speed sensor failure (A / T on).
Nanjing's auto repair expert cabinet Analysis: Is it because the speed sensor (A / T I) control computer failure does not immediately lock file. when the vehicle speed sensor (A / T) expired, there is another wheel speed sensor (ABS) in the supporting role. because the wheel speed sensors provide parameters to give ABS main control computer, For braking performance, and many other considerations. can only be shut down control system. When the transmission control computer to receive less than the wheel speed signal from the sole will immediately lock file. replace the sensor, gearbox is working. in the automotive repair process , the use of data stream parameters of each sensor to determine accurately analyze the status of each sensor is indispensable basis for the work.
Fault 2: a Nissan sedan demeanor A32, the transmission is protected.
circuit part of the preliminary determination might be malfunctioning. with special detector test, a fault code, content for the solenoid valve A circuit or short circuit. because not every special equipment maintenance units are introduced here about the vehicle automatic transmission electrical control system of artificial modem methods:
(1) Start the engine to warm up (about 20min).
(2) Turn off the ignition switch to
(4) the speeding stop switch br> (7) O / DOFF lights flashing, after 2s:
(1) Turn off the ignition switch, placed in (3) speed gear switch to
(1) transmission shift lever placed in the ; block.
(2) speed gear switch to 4th flash longer (with special equipment showed consistent failure). Disconnect the wiring harness plugs shift valve A check from the transmission control unit connected to the wiring harness and found that open circuit condition, the broken connection After clear the fault code. clear the fault code should pay attention to, if the ignition switch ; location, and then run the self-diagnostic program, turned off the ignition switch after the self-diagnostic results removed. and then proceed to trial, the transmission work perfectly normal, modem again, no fault codes appear to solve the problem.
Fault 3: Cabinet to join department Type a RE4F04A no reverse gear after the transmission overhaul.
after careful examination by the disintegration of that reverse gear clutch failure due to wrong installation of steel due to the buffer.
Analysis: RE4F04A reverse gear automatic transmission buffer Steel There are 2 pieces: one for the disc, the assembly process simply check the disk buffer sheet is not deformed or damaged, whether the thickness of the disk assembly data requirements, under normal circumstances will not be installed wrong. the other is steel type (similar to the look and clutch steel, the outer ring of steel teeth, a total of two). This buffer steel in the assembly process is prone to problems. This is no reverse gear transmission units is exactly the reason, the maintenance steel workers on the assembly buffer when the gear installed together (the correct installation method should be the wrong gear installed), resulting in smaller gap than the original clutch gap or no gap (the original gap 0? 5 ~ 0? 8mm, the limit 1? 2mm), then artificially adjust the clutch if the gap will cause the piston working stroke is too large, in the course of their work loss bsp; Fault 4: a RE4F04A type transmission overhaul, the vehicle driving around 200km late and there Shengdang fault-free 4 block.
examination by the disintegration of the brake band has been found burned.
Analysis: by measuring and found the brake band and brake drum contact surface uneven exposure at work is not complete, leading to brake with burned out. replacement brake drums and brake belt, according to original standards, tightening torque to the top sold 3? 9 ~ 5? 9N Road m, back 2? 5 laps, and then lock Tighten the nuts to 31 ~ 36N Road maintenance m. After the above process after the transmission dynamic testing machine for testing, problem solved.
Fault 5: a transmission overhaul after RE4F04A no 3,4-type block.
by After the examination revealed the disintegration of the high gear clutch burned out, and found in the sump at the piece of metal debris and the friction generated burned black dirt. preliminary analysis of doubt?? inspection body, found that the main oil pressure regulator valve catching .
of reasons: because of catching it is not carefully cleaned overhaul cooling system, making the dirt in the oil recycling process are brought into the body, catching the valve. After carefully cleaning the body, transmission oil Road and cooling system and replace the clutch, the hydraulic testing machine with a hydraulic test, each time the clutch oil pressure were normal. Finally, after the transmission loading test, all normal.
Fault 6: the same model of a transmission After overhaul, the cold car transmission works fine, hot car skid block 3,4.
inspection by the disintegration of the brake with a slight burning was found.
detected by the hydraulic test machine, hydraulic clutch in each group were normal, initially suspected the problem lies in the body part. but when tested on the body and found no faults. Remove all solenoid valves, solenoid valve installed in the test machine, the oil temperature is 20 ℃ constant testing, not find the problem. But when the oil temperature rose to 70 ℃ will be tested again and found that O / D gear hydraulic solenoid valve hydraulic beyond the standard range, drain phenomenon. in the replacement of the solenoid valve and the brake band after dynamic test transmission on the test machine, fault disappears.
of failure in this case did not rule out the reason: the absence of special test equipment, can only measure the resistance and power solenoid valve solenoid valve action cases, and when the solenoid valve work can not measure the oil pressure is normal to the.
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