UltraShift PLUS
TRTS0940 EN-US
|
July 2024 - A

Fault Code 22: ABS CAN Message

J1587: MID 130 PID 49 FMI 9, 14

J1939: SA 3 SPN 563 FMI 9, 14

Overview

The UltraShift PLUS transmission is equipped with Hill Start Aid (HSA) which prevents roll-back and roll-forward while launching on grades that are 1% and greater. The HSA holds for 3 seconds using vehicle foundation wheel brakes. The Transmission Electronic Control Unit (TECU) and ABS Module communicate over the J1939 Data Link and control the HSA function. Fault Code 22 sets if the TECU loses communication with the ABS or the ABS communicates that the HSA is not available.

Detection

The TECU communicates with the ABS module over the J1939 Data Link. If communication is lost with the ABS module or the ABS module broadcasts a message indicating HSA is not available, this fault sets Active.

Conditions to Set Fault Code Active

FMI 9 – Abnormal Update Rate: TECU detects a loss of communication with the ABS Module over the J1939 Data Link for 5 seconds while other J1939 devices are still communicating with the TECU.

FMI 14 – Special Instructions: TECU receives a message from the ABS Module, over the J1939 Data Link, that the HSA function is not available.

Fallback

All FMIs

  • Hill Start Aid is inoperative.

Conditions to Set Fault Code Inactive

All FMIs: TECU establishes communication with the ABS module and the ABS module communicates that HSA is available.

Possible Causes

FMI 9

  • J1939 Data Link
    • J1939 Data Link damage between TECU and ABS module
    • Bent, spread, corroded or loose terminals
    • Wiring shorted to ground, shorted to power or open

FMI 14

  • ABS System
    • ABS component or system fault code
    • ABS module does not support or is not configured for HSA
    • ABS module internal failure
  • HSA Disable Switch
    • Bent, spread, corroded or loose terminals
    • Wiring shorted to ground, shorted to power or open
    • Internal failure

Component Identification

Refer to OEM guidelines for proper documentation.

Fault Code 22 Troubleshooting

A
Purpose:Check for Active or Inactive ABS fault codes.

  1. Key on with engine off.

    Note: Fault Code 22 indicates an issue with communication between the transmission and ABS module over the J1939 Data Link or an issue with the HSA Disable Switch. All wiring and pin outs for connectors are OEM proprietary. Refer to OEM guidelines for proper documentation.

  2. Retrieve and record ABS fault codes using an OEM-approved diagnostic tool.

  • If the ABS diagnostic tool can not communicate with the ABS system, troubleshoot the ABS issue per OEM guidelines. Go to Step V

  • If no ABS fault codes are set, inspect HSA Disable Switch for proper operation per OEM guidelines. Go to Step V

    Note: If there are no ABS, J1939 communication or HSA Disable Switch issues, refer to OEM guidelines for troubleshooting intermittent ABS, J1939 communication or HSA Disable Switch issues.

V
Purpose:Verify repair.

  1. Key off.

  2. Reconnect all connectors and verify that all components are properly installed.

  3. Key on with engine off.

  4. Clear fault codes using ServiceRanger.

  5. Drive vehicle and attempt to reset the fault code or duplicate the previous complaint.

  6. Check for fault codes using ServiceRanger.