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CReader Series English User’s Manual
21
5.3.7 ABS Bleeding (Only applies to CReader 7011F/9081)
This function allows you to perform various bi-directional tests to check the
operating conditions of Anti-lock Braking System (ABS).
1. When the ABS contains air, the ABS bleeding function must be performed to
bleed the brake system to restore ABS brake sensitivity.
2. If the ABS computer, ABS pump, brake master cylinder, brake cylinder, brake
line, or brake fluid is replaced, the ABS bleeding function must be performed to
bleed the ABS.
5.3.8 Gear Learning (Only applies to CReader 9081)
The crankshaft position sensor learns crankshaft tooth machining tolerance and
saves to the computer to more accurately diagnose engine misfires. If tooth
learning is not performed for a car equipped with Delphi engine, the MIL turns on
after the engine is started. The diagnostic device detects the DTC P1336 'tooth
not learned'. In this case, you must use the diagnostic device to perform tooth
learning for the car. After tooth learning is successful, the MIL turns off.
After the engine ECU, crankshaft position sensor, or crankshaft flywheel is
replaced, or the DTC 'tooth not learned' is present, tooth learning must be
performed.
5.3.9 IMMO Service (Only applies to CReader 9081)
An immobilizer is an anti-theft mechanism that prevents a vehicle’s engine from
starting unless the correct ignition key or other device is present. Most new
vehicles have an immobilizer as standard equipment. An important advantage of
this system is that it doesn’t require the car owner to activate it since it operates
automatically. An immobilizer is considered as providing much more effective
anti-theft protection than an audible alarm alone.
As an anti-theft device, an immobilizer disables one of the systems needed to
start a car’s engine, usually the ignition or the fuel supply. This is accomplished by
radio frequency identification between a transponder in the ignition key and a
device called a radio frequency reader in the steering column. When the key is
placed in the ignition, the transponder sends a signal with a unique identification
code to the reader, which relays it to a receiver in the vehicle’s computer control
module. If the code is correct, the computer allows the fuel supply and ignition
systems to operate and start the car. If the code is incorrect or absent, the
computer disables the system, and the car will be unable to start until the correct
key is placed in the ignition.
To prevent the car being used by unauthorized keys, the anti-theft key matching
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