Anti Lock Braking system 1992
Posted: Tue Apr 27, 2021 12:06 pm
Overview
Probes equipped with anti-lock brake systems have an internal diagnostic system. When the engine is started, the ABS warning lamp on the instrument cluster should illuminate for a second or two, and then go out. If the lamp stays illuminated after the engine is started or illuminates while driving, there may be a problem with the anti-lock brake system. Checking for error codes is an easy way to find out what's wrong and what, if anything, caused the ABS warning lamp to illuminate.
Procedure
Checking for codes can be performed with a standard analog voltmeter. Set the meter to read between 0 and 20 volts.
There are two types of error codes:
Present Error Code
An ABS warning lamp that stays illuminated indicates that there is a present failure.
Continuous Error Code
A flashing ABS warning lamp indicates a continuous error code. This type of occurrence is for intermittent faults where a fault code was generated at one point, but is no longer present.
There are two ways to check for error codes:
Engine Code Scanner
If you have a Super STAR II or equivalent engine code scanner, you can perform a quick test on your anti-lock brake system to see if there's anything wrong. Simply connect it according to the manufacturer's instructions and write down the codes that appear. Codes are listed below.
Analog Voltmeter
Set the meter to read between 0 and 20 volts. Remove the driver's seat. Find the four-wire connector on the ABS control module. Without disconnecting the connector, connect a jumper wire between the check terminal wire (Green/Black) and the ground wire (Black).
Connect the positive wire of the voltmeter to the Green/Red wire on the ABS control module connector. Connect the negative wire on the voltmeter to a ground.
When you're ready to start the test, start the engine. If a continuous error code is present, it may be necessary to drive the vehicle to try to re-create the fault event.
See below for how to interpret the pulses.
Interpreting the Codes
The pulses on the voltmeter translate into single digit codes. Every time the needle on the voltmeter sweeps across to 12 volts and drops back to zero, that is considered one pulse. Codes are displayed by the number of pulses the voltmeter displays. So three pulses would indicate an error code 3. If there is more then one error code, they are separated by a longer pause.
In addition to the voltmeter, you will need to keep an eye on the ABS warning lamp during the test as well. The lamp will either flash on then off once for each code, or will stay illuminated. A flash or a continuous illumination of the ABS warning lamp will be part of determining which fault is present.
Clearing the Codes
At the ABS control module connector, connect a jumper wire between the Green/Black wire and the Black wire. Connect the voltmeter as described above for reading the codes. Turn the ignition on. After the first code is repeated, press the brake pedal ten times at intervals of less then one second each. Turn the ignition off and remove the jumper wire.
Probes equipped with anti-lock brake systems have an internal diagnostic system. When the engine is started, the ABS warning lamp on the instrument cluster should illuminate for a second or two, and then go out. If the lamp stays illuminated after the engine is started or illuminates while driving, there may be a problem with the anti-lock brake system. Checking for error codes is an easy way to find out what's wrong and what, if anything, caused the ABS warning lamp to illuminate.
Procedure
Checking for codes can be performed with a standard analog voltmeter. Set the meter to read between 0 and 20 volts.
There are two types of error codes:
Present Error Code
An ABS warning lamp that stays illuminated indicates that there is a present failure.
Continuous Error Code
A flashing ABS warning lamp indicates a continuous error code. This type of occurrence is for intermittent faults where a fault code was generated at one point, but is no longer present.
There are two ways to check for error codes:
Engine Code Scanner
If you have a Super STAR II or equivalent engine code scanner, you can perform a quick test on your anti-lock brake system to see if there's anything wrong. Simply connect it according to the manufacturer's instructions and write down the codes that appear. Codes are listed below.
Analog Voltmeter
Set the meter to read between 0 and 20 volts. Remove the driver's seat. Find the four-wire connector on the ABS control module. Without disconnecting the connector, connect a jumper wire between the check terminal wire (Green/Black) and the ground wire (Black).
- abs01.gif (7.96 KiB) Viewed 804 times
- abs02.gif (14.84 KiB) Viewed 804 times
See below for how to interpret the pulses.
Interpreting the Codes
The pulses on the voltmeter translate into single digit codes. Every time the needle on the voltmeter sweeps across to 12 volts and drops back to zero, that is considered one pulse. Codes are displayed by the number of pulses the voltmeter displays. So three pulses would indicate an error code 3. If there is more then one error code, they are separated by a longer pause.
- examplecode_voltmeter.gif (13.72 KiB) Viewed 804 times
Clearing the Codes
At the ABS control module connector, connect a jumper wire between the Green/Black wire and the Black wire. Connect the voltmeter as described above for reading the codes. Turn the ignition on. After the first code is repeated, press the brake pedal ten times at intervals of less then one second each. Turn the ignition off and remove the jumper wire.
- a1992abscodes.jpg (158.3 KiB) Viewed 804 times