SHIM PACK 1345788 - Caterpillar

Table 1
List Of Event Codes (EID) For The Chassis ECM (MID 87)
Code (Level) And Description Conditions Which Generate This Code System Response
E1248 (1) Front Cross Axle Lock Speed Mismatch Activates - when the ATC(1) detects abnormal left and right front wheel speeds.
Deactivates - when event is cleared and ATC detects normal left and right front wheel speeds.
Inputs - Front Left and Front Right wheel speed sensors. Front cross axle lock will be disabled.
ATC(1) lamp will flash.
Warning message displayed on the Secondary Display.
E1249 (1) Center Cross Axle Lock Speed Mismatch Activates - when the ATC(1) detects abnormal left and right center wheel speeds.
Deactivates - when event is cleared and ATC detects normal left and right center wheel speeds.
Inputs - Center Left and Center Right wheel speed sensors Center cross axle lock will be disabled.
ATC(1) lamp will flash.
Warning message displayed on the Secondary Display.
E1250 (1) Rear Cross Axle Lock Speed Mismatch Activates - when the ATC(1) detects abnormal left and right rear wheel speeds.
Deactivates - when event is cleared and ATC detects normal left and right rear wheel speeds.
Inputs - Rear Right and Rear Left wheel speed sensors Rear cross axle lock will be disabled.
ATC(1) lamp will flash.
Warning message displayed on the Secondary Display.
(1) Automatic Traction Control (ATC) lamp is located on the main cluster displayProbable Causes
Incorrect wheel speed sensor gap due to loose mounting bolts.
Failure of one of the wheel speed sensors.
Low cross axle lock control solenoid oil supply pressure due to:
Failure of corresponding cross axle lock control solenoid.
Failure of cross axle supply pressure reducing valve in the main combination valve.
Broken axle shaft.
Failure of corresponding cross axle lock clutch pack.Recommended Actions
Table 2
Cross Axle Lock Speed Is Mismatched
Troubleshooting Test Steps Results
1. Check For Codes
A. Connect Cat® ET to the truck.
B. Determine how many E1248, E1249, E1250, or E1251 event codes have occurred and when the last event occurred.
C. Check and address any related diagnostic codes.
D. Clear the event and operate the truck in the same manner as when the event was triggered, to see if the event returns. OK - E1248, E1249, E1250, or E1251 code does not return.
Proceed to Test Step 2.
NOT OK- A related diagnostic code is present.
Troubleshoot any related codes before continuing with this procedure. Refer to the corresponding diagnostic code test procedure in this Troubleshooting guide.
NOT OK - E1248, E1249, E1250, or E1251 code remains present.
Proceed to Test Step 2.
2. Monitor The Corresponding Wheel Speed In Cat® ET
A. Connect Cat® ET and monitor and record the corresponding wheel speeds.
B. Drive the truck in a straight line over good/smooth ground conditions and note the wheel speeds. OK - Wheel speeds are approximately the same.
Proceed to Test Step 4.
NOT OK - Wheel speeds are NOT approximately the same.
Proceed to Test Step 3.
3. Check The Suspect Wheel Speed Sensor
A. Troubleshoot the wheel speed sensor in question. Refer to the FMI 8 test procedure for the involved speed sensor in this manual. (CID 3531, 3533. 3535, & 3539)
B. Check for incorrect speed sensor gap due to loose bolts