Fault Code 160: Service Brake Switch
J1939: SA 3 SPN 597 FMI 9, 13, 14, 19
Overview
The Transmission Control Module (TCM) receives the vehicle’s Service Brake Pedal Switch message from a vehicle Electronic Control Unit (ECU) over the Primary Data Link (J1939A). This information is used to determine transmission operation.
Detection
The TCM monitors Service Brake Pedal Switch messages. If messages are not received or are invalid, the fault is set Active.
Conditions to Set Fault Code Active
FMI 9 – Abnormal Update Rate: Service Brake Pedal Switch message not received for 10 seconds.
FMI 13 – Out Of Calibration: Service Brake Pedal Switch message not available for 10 seconds.
FMI 14 – Special Instructions: Service Brake Pedal Switch messages not received after a launch for 1 second.
FMI 19 – Received Network Data In Error: Service Brake Pedal Switch messages invalid for 10 seconds.
Fallback
FMI 9, 13, 14, 19:
- If Fault Code 140, 160 and 164 are all Active:
- Amber warning lamp on
- Urge to Move and Creep Mode prohibited
- Hill Start Aid prohibited
- Transmission may not allow a shift out of Neutral
Note: Vehicle may have additional fallback modes. Refer to OEM.
Conditions to Set Fault Code Inactive
FMI 9, 13, 14, 19: Service Brake Pedal Switch messages received and valid for 10 seconds.
Possible Causes
FMI 9, 13, 14, 19:
- Vehicle Components
- Service Brake Pedal Switch message not enabled
- Other vehicle ECU(s) faulted
- Vehicle Harness - Primary Data Link (J1939A)
- Wiring shorted to power, shorted to ground or open
- Terminals bent, spread, corroded, or loose
Note: Refer to OEM for troubleshooting a failed system.
Additional Tools
- None
Fault Code 160 Troubleshooting
Set vehicle parking brake and chock wheels.
Record transmission fault codes, FMIs, occurrences, and timestamps from Service Activity Report created during the Diagnostic Procedure.
If Fault Code 160 is Inactive and there are other Active vehicle or transmission fault codes, troubleshoot all Active fault codes. Go to Step V
If Fault Code 160 FMI 9, 14, 19 is Active or Inactive, Go to Step B
If Fault Code 160 FMI 13 is Active, refer to OEM and enable vehicle Service Brake Pedal Switch message (SPN 597). Go to Step V
If Fault Code 160 FMI 13 is Inactive, Go to Step V
Key on with engine running.
Allow air pressure to build to governor cut off.
Key off.
Key on with engine off.
Connect ServiceRanger.
Go To “Data Monitor”.
Select “Status”.
Select “Brake switch”.
Select all “- 597” SPN sources.
Note: Not all sources will indicate a value.
Monitor 597 - Brake switch value. Record reading in table.
Depress and hold service brake.
Release vehicle parking brake.
Monitor 597 - Brake switch value. Record reading in table.
Set vehicle parking brake.
Compare reading(s) in table.
If readings are out of range, refer to OEM guidelines for repair of the vehicle Service Brake Pedal Switch message (SPN 597). Go to Step V
If readings are in range and no fault was found, the intermittent nature of the fault makes it likely that the problem is in the vehicle Service Brake Pedal Switch message (SPN 597). Contact OEM for further diagnostic instructions. Go to Step V
| Service Brake State | Parameter | Range | Reading(s) |
|---|---|---|---|
| Released | 597 - Brake Switch | Released | |
| Depressed | 597 - Brake Switch | Depressed |
Key off.
Reconnect all connectors and verify all components are properly installed.
Key on with engine off.
Connect ServiceRanger.
Go To “Fault Codes”.
Select “Clear All Faults”.
Operate vehicle and attempt to reset the fault code or duplicate the previous complaint.
Check for fault codes using ServiceRanger.
If no fault codes set and vehicle operates properly, test complete.
If Fault Code 160 sets Active, Go to Step A
If a fault code other than 160 sets Active, troubleshoot per Fault Code Isolation Procedure Index.