Endurant HD
TRTS0950 EN-US
|
October 2024 - B

Fault Code 110: Ignition Voltage

J1939: SA 3 SPN 158 FMI 2

Overview

The Transmission Control Module (TCM) requires a key on battery voltage ignition supply. The Ignition Voltage initiates TCM operation at and during key on. The Ignition Voltage circuit is contained within the 20-Way TCM Vehicle Harness Connector.

Detection

The TCM monitors the vehicle’s Ignition Voltage supply. If the system detects a loss of Ignition Voltage while driving, the fault is set active.

Conditions to Set Fault Code Active

FMI 2 – Data Erratic: Loss of Ignition Voltage with output shaft speed greater than 10 RPM.

Fallback

FMI 2:

  • Engine communications may not be available
  • If vehicle comes to a stop, TCM will shut down

    Note: Refer to OEM for troubleshooting a failed system. Engine fallback modes may vary. If Engine ECU loses Ignition supply, Engine may shut down.

Conditions to Set Fault Code Inactive

FMI 2: Ignition Voltage is available with output shaft speed less than 10 RPM.

Possible Causes

All FMIs:

  • Ignition switch keyed off during operation
  • Ignition switch failure
  • Vehicle Harness
    • Wiring shorted to ground or open
    • Terminals bent, spread, corroded or loose

Component Identification

_Graphics/LineArt/TRTS0950_FC100x_ComponentID.png

1. 20-Way TCM Vehicle Harness Connector

2. Transmission Control Module (TCM)

_Graphics/LineArt/TRTS0950_FC110_WiringID.png

1. Transmission Control Module (TCM)

2. 20-Way TCM Vehicle Harness Connector

3. In-line Fuse Holder

4. 10-amp Fuse

_Graphics/LineArt/TRTS0950_Wiring-Key.png

Fault Code 110 Troubleshooting

A
Purpose:Check for Active or Inactive fault codes.

  1. Set vehicle parking brake and chock wheels.

  2. Record the transmission fault codes, FMIs, occurrences, and timestamps from the Service Activity Report created during the Diagnostic Procedure.

    Note: If vehicle comes to a stop, TCM will shut down, and Fault Code 110 will be Inactive.

  • If Fault Code 110 is Inactive and there are other Active vehicle or transmission fault codes, troubleshoot all Active fault codes. Go to Step V

  • If Fault Code 110 FMI 2 is Inactive, Go to Step B

B
Purpose:Verify battery voltage ignition supply.

  1. Key on with engine off.

  2. Connect ServiceRanger.

  3. Go To “Data Monitor”.

  4. From the “Default Parameter Files” tab, select “Transmission Supplied Voltages”.

  5. Monitor 158 - Battery voltage - switched value. Record reading in table.

  6. Compare reading(s) in table.

  • If readings are within range:

    • Driver may have cycled the key off while the vehicle was moving.
    • or
    • The intermittent nature of the fault makes it likely that the problem is between the vehicle’s Ignition Voltage supply and 20-Way TCM Vehicle Harness Connector Pin 10. Refer to OEM guidelines for repair or replacement of the Ignition Voltage supply circuit. Go to Step V
ParameterRangeReading(s)
158-Battery voltage - switched11–15 V
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. Connect ServiceRanger.

  5. Go to “Fault Codes”.

  6. Select “Clear All Faults”.

  7. Operate vehicle and attempt to reset the fault code or duplicate the previous complaint.

  8. Check for fault codes using ServiceRanger.