Test A: The Anti-Lock Brake/Traction Control (ABS/TC) Module Does Not Respond To The Diagnostic Tool
PINPOINT TEST A: THE ANTI-LOCK BRAKE/TRACTION CONTROL (ABS/TC) MODULE DOES NOT RESPOND TO THE DIAGNOSTIC TOOLA1-A3:
A3-A4:
A4-A5:
A6-A7:
Normal Operation
The ABS/TC module communicates with the diagnostic tool through the standard corporate protocol (SCP) communications network circuits 4-CF6 (GY) and 5-CF6 (BU). If one of the SCP communications network circuits become shorted to ground or voltage, or if some but not all termination resistors are lost, communications can continue. Check circuits 4-CF6 (GY) and 5-CF6 (BU) between the ABS/TC module C155 and the data link connector (DLC) C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms there is an open in circuit 4-CF6 (GY) or 5-CF6 (BU), damage to the DLC C251, damage to the ABS/TC module C155, a problem in the interior auxiliary junction box (AJB) C283c, interior AJB C283d or joint connector No. 4 C223.
Possible Causes
- SCP data plus circuit 4-CF6 (GY) open
- SCP data minus circuit 5-CF6 (BU) open
- joint connector No. 4 C223
- interior AJB C283c
- interior AJB C283d
- ABS/TC module C155
- ABS/TC module