Many newer ABS systems have no flash codes so you must use a scan tool to pull the codes.
#AA2 MODS FOR ABS MANUAL#
But the EBC applications do not provide manual flash codes so a scan tool is needed. Kelsey-Hayes four-wheel 4WAL (introduced in 1990) and EBC systems (introduced in 1993) can remember multiple codes. The manual procedure on the GM trucks is the same as that for a passenger car, but on Ford and Dodge trucks a pigtail connector has to be grounded to make the ABS light flash. Kelsey-Hayes RWAL systems on older GM, Ford and Dodge trucks (1987 & up) can only store one code at a time, but the code can be accessed manually or with a scan tool. But to clear codes, you need a scan tool.
Codes will stay in memory 50 ignition cycles. On these systems, flash codes repeat three times. On a typical General Motors application with a Bosch 2U ABS system (1990-94 fullsize rear-wheel drive passenger car), for example, codes can be accessed manually by grounding terminal "H" on the ALDL connector, then counting flashes of the ABS lamp. On ABS systems that provide manual flash codes (such as Bosch 2E, 2S, 2U and 3, Kelsey-Hayes RWAL and 4WAL, and ITT Teves Mark 2), you do not need a scan tool but using one reduces the chance of misreading a code. If the light is on, you have to perform pinpoint circuit tests to isolate the fault. On early Bosch 2 ABS import systems, there are no codes. Pulling trouble codes from an ABS system may be easy or difficult depending on the application. Either way, you will have to pull the code to figure out what is wrong. If you are not dealing with a real problem the ABS system has self-diagnosed, you may have a "false" code that was set by some combination of circumstances. Reading Antilock Brake Codes by Larry Carley copyright 2019 Īn ABS warning lamp that is on usually means trouble.
#AA2 MODS FOR ABS MANUALS#
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