Diagnostic System Check - ABS W/O JL4
Circuit Description
The ABS Diagnostic System Check is an organized approach to identifying problems associated with the ABS/TCS/DRP. This must be the starting point for any ABS/TCS/DRP related concern and will direct you to the next logical step in diagnosing a malfunction. Most system malfunctions are linked to faulty wiring, connections and occasionally, to components. Understanding the ABS system and using the diagnostic tables correctly will reduce diagnostic time and prevent unnecessary parts replacement.
Test Description
The numbers below refer to the step numbers in the diagnostic table.
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Lack of communication may be due to partial or total malfunction of the serial data circuit. The specified procedure will determine the particular condition.
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The presence of DTCs that begin with a "U" indicates that some other module is not communicating. The specified procedure will compile all of the available information before tests are performed.
Step | Action | Yes | No | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Install a scan tool. Does the scan tool power up? | Go to Step 2 | Go to Scan Tool Does Not Power Up in Data Link Communications | ||||||||
Does the scan tool communicate with all of the control modules listed above? | Go to Step 3 | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | |||||||||
3 | Use the scan tool in order to display DTCs for the following control modules.
Does the scan tool display any DTCs for the control modules listed above? | Go to Step 4 | |||||||||
Does the scan tool display any DTCs that begin with a "U", DTC C0290- C0292 or C0297? | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | Go to Step 5 | |||||||||
5 | Does the scan tool display DTC P0500, P0502, P0503, P0562, P0563, P0601-P0607, P1381, P1621, P1627 or P1683? | Go to Diagnostic Trouble Code (DTC) List in Engine Controls - 4.8L, 5.3L, or 6.0L or Diagnostic Trouble Code (DTC) List in Engine Controls - 8.1L |
Diagnostic System Check - ABS W/JL4
Circuit Description
The ABS Diagnostic System Check is an organized approach to identifying problems associated with the ABS/TCS/DRP or VSES. This must be the starting point for any ABS/TCS/DRP or VSES related concern and will direct you to the next logical step in diagnosing a malfunction. Most system malfunctions are linked to faulty wiring, connections and occasionally, to components. Understanding the ABS system and using the diagnostic tables correctly will reduce diagnostic time and prevent unnecessary parts replacement.
Test Description
The numbers below refer to the step numbers in the diagnostic table.
-
Lack of communication may be due to partial or total malfunction of the serial data circuit. The specified procedure will determine the particular condition.
-
The presence of DTCs that begin with a "U" indicates that some other module is not communicating. The specified procedure will compile all of the available information before tests are performed.
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Since the VSES interacts extensively with powertrain control systems, powertrain related DTCs should be diagnosed and repaired prior to diagnosing any VSES concerns.
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The presence of this DTC, which the scan tool may display in Powertrain, may cause the EBCM to set DTC C0283.
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The presence of this DTC, which may be set by the body control module (BCM), may cause the EBCM to set DTC C0455.
Step | Action | Yes | No | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Install a scan tool. Does the scan tool power up? | Go to Step 2 | Go to Scan Tool Does Not Power Up in Data Link Communications | ||||||||||
Does the scan tool communicate with all of the control modules listed above? | Go to Step 3 | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | |||||||||||
3 | Use the scan tool to display DTCs for the following systems or specific control modules.
Does the scan tool display any DTCs for the control modules listed above? | Go to Step 4 | |||||||||||
Does the scan tool display any DTCs that begin with a "U"? | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | Go to Step 5 | |||||||||||
Does the scan tool display any DTCs that begin with a "P"? | Go to Diagnostic System Check - Engine Controls in Engine Controls - 4.8L, 5.3L, or 6.0L | Go to Step 6 | |||||||||||
Does the scan tool display DTC B2725? | Go to Diagnostic System Check - Transfer Case in Transfer Case - BW 4482-NR4 | Go to Step 7 | |||||||||||
Does the scan tool display DTC B2620? | Go to Diagnostic System Check - Lighting Systems in Lighting Systems |
