I identified the all of the main components for the ABS system on the vehicle we used which was a 1996 Mitsubishi galant. I identified the:
· Wheel speed sensor.
· ABS control unit
· ABS modulator
· ABS pump
· Parking brake switch
· Brake fluid level sensor
· RPM sensor
· Brake booster
· Main ABS fuse.
I know the vehicle used analogue wheel speed sensors because they only had 2 wires on the connectors.
The air gaps on all 4 wheel speed sensors were:
FR= 0.305mm, 0.12 thou (Resistance= 1.36K ohms, V= 4.7vac)
FL=0.305, 0.12 thou
RR=0.406mm, 0.16 thou
RL=0.406mm,0.16 thou.
The wheel speed sensors were in average condition. They have no problems so i wouldn't replace or do anything to them.
This is the waveform acquired from the ABS wheel speed sensor off the galant.
Using the Scan tool.
The information the scan tool showed about the ABS system is:
FRS= 16.32KM/H (Flucated a bit then stay constant , no acceleration vehicle=in drive)
FLS=16.32KM/H (Flucated a bit then stay constant , no acceleration vehicle=in drive)
RRS=0KM/H (Not rear wheel drive and car was in the air)
RLS=0KM/H (Not rear wheel drive and car was in the air)
Battery Voltage= 11.37 ( Car off) 13.6 (Car on, Alternator charging).
G sensor=0V
Stop lamp switch off.
Abbreviations
PCM= Power train control module
TCC= Torque converter clutch
TPS= Throttle position sensor
ECT= Engine coolant temperature sensor
VSS= Vehicle speed sensor
PSA= Transmission range fluid pressure switch assembly
TTS= Transmission Temperature sensor .
BLOCK DIAGRAM
WIRING DIAGRAM
SHIFT CHART
Which solenoids are on when this vehicle is shifted into drive and starts out first gear
1-2 Solenoid and 2-3 Solenoid.
Which solenoids are on when this vehicle automatically shifts into second gear.
2-3 solenoid
Which solenoids are on when this vehicle automatically shifts into third gear
Both solenoids are off.
Which solenoids are on when this vehicle automatically shifts into fourth gear.
1-2. solenoid
Fault no solenoids comes on.
Would only have 3rd gear. Would be difficult to drive really slow takes offs and wouldnt be able to do a hill start. Could go up a hill if you accelerated before.
P0715 Honda Automatic fault code.
Means a problem with the linear solenoid. You have to flush the transmission to fix the problem.
The transmission vibrating when shifting gears. To diagnose you would have to use the scan tool and then see if you have the same fault in this case a vibrating transmission.
Fixing procedures (genuine honda)
Raise the vehicle on a hoist.
Drain the transmission. Refill it with Genuine Honda ATF.
Start the engine.
With your foot on the brake pedal, shift the transmission to D4.
Release the brake pedal. Press on the accelerator, and bring the speedometer up to 50 mph. Make sure the transmission shifts through the first three lower gears and into fourth, and that the torque converter locks up.
Apply the brakes to stop the front wheels.
Shift to reverse, and then to neutral.
Repeat the shifting procedure (steps 4 through 7) four more times.
Turn off the engine.
Repeat the above drain, refill, and shifting procedure (steps 2 through 9) two more times.
Drain the transmission. Reinstall the drain bolt with a new washer. Refill the transmission with Genuine Honda ATF.
P0752 Shift Solenoid A Stuck On. (Mercedes benz)
To diagnose this problem you would have to have a shift chart for mercedes benzdriving the vehcile with a scan tool and seeing which solenoids are open and closed.. This would mean the car would have 1 or 2 gears or possibly no gears. You could tell by
To fix the problem you would have to take gearbox apart and rebuild it.
Solenoid positions (1996 Mitsubishi Galant)
Used the Hanatech multiscan P1 scan tool to identify the solenoid positions.
The Solenoids are: 2ND, OD, LR, UD
A torque converter is a type of fluid coupling, which allows the engine to spin independently of the transmission. If the engine is turning slowly, such as when the car is idling at traffic lights, the amount of torque passed through the torque converter is very small, so keeping the car still requires only a light pressure on the brake pedal.
The torque converter comes on during gear changes. Used to separate the engine from the gearbox similar job to a mechanical clutch. The brake pedal engages the torque converter.
CAN WORKSHEET.
The wires are twisted every 20-30mm to prevent capacitance , reduces EMF noise and radio interference. Resistance, Capacitance, length and resistance must remain the same or the signal will be different.
CAN (TYPE C) Capable of high speeds (256KBS-1MBS) is used for important ECUS such as the ABS ECU, Powertrain controls and Emission controls. Not fault tolerant. Should be 60 ohm. (two 120 ohm resistors in parallel).
CAN (TYPE B) is the slower more fault tolerant type is used for less important electrics such as door locks and comfort devices such as heaters/aircon. As long as one wire of the two wires has potential voltage difference from ground, bus should be able to operate.
CAN B may operate in “1 wire mode” with voltage @ 1.2 v.
I used a 2003 land rover.
I used the twisted pairs from the ABS modulator.
Aliasing is an effect where the original signal can become unreadable. Also a distorted or noisy signal. The below waveforms are not aliasing because they are read-able and we used the correct time division.
The voltage on the main line of (1.3) was 2.63V. When it was talking voltage became 2.3V. This is the high speed line.
The voltage on the main line of(1.4) was 0.25V. When it was talking the voltage became 0.18V. This is the low speed line.
This is the waveform from the wires yellow & brown (1.3)
The time divison is 20ms and voltage was 1v per divsion.Waveform from wires yellow and black
Scan tool observations
The Vehcile i used was the land rover 2003.
I used the scan tool Autoboss (star) for the observations
The different system that are controlled by CAN in this vehicle are:
EHC/EHC2 Electrical ride height level (FAST)
ABS/STABILITY Control (FAST)
EDC Electronic Damper control (FAST)
SRS Airbag (SLOW)
ZKE Body electronics (SLOW)
IHKR Heater/Aircon (SLOW)
IKE Instrument cluster (SLOW)
Steering angle sensor (FAST)
DME/DDE motor & Petrol electronics (FAST)
EMC electronic engine power control (FAST)
EGS Electronic Transmission Control. (FAST)
EWS Vehicle immobilizer (SLOW)
CR Cruize control. (SLOW)
THE DIFFERENT FUNCTIONS OF THE SCAN TOOL ARE:
Print screen.
Portrait / Landscape
Demo
Quickscan
manual scan
Diagnostic.
No comments:
Post a Comment