Fault Code 65: Gen1 ECA Speed Sensor (TRTS0940)

UltraShift PLUS

TRTS0940 EN-US

July 2024 - A

Fault Code 65: Gen1 ECA Speed Sensor

J1587: MID 130 PID 190 FMI 2, 5

J1939: SA 3 SPN 5052 FMI 2, 5

Overview

The UltraShift PLUS transmission is equipped with an Electronic Clutch Actuator (ECA) Speed Sensor that provides a secondary engine speed signal to the Transmission Electronic Control Unit (TECU). The ECA Speed Sensor is installed in the clutch housing. The ECA broadcasts the ECA Speed Sensor signal to the TECU through the High Integrity Link (HIL) contained within the transmission harness.

The TECU uses the ECA Speed Sensor signal to determine engine speed when the J1939 engine speed signal is not available. Early models have a thread-in ECA Speed Sensor installed in the flywheel housing. Fault Code 65 indicates either a loss of the signal or an electrical issue with the ECA Speed Sensor.

Detection

The TECU monitors the ECA Speed Sensor signal and compares the sensor reading with the J1939 Engine Speed signal to determine sensor validity. The TECU also monitors the ECA Speed Sensor electrical circuit for any shorts to ground or open circuits.

Conditions to Set Fault Code Active

The system can detect ECA Speed Sensor faults when one of the following conditions is present for 1 second or longer:

FMI 2 – Data Erratic: TECU detects engine speed over J1939 at idle, but does not detect ECA engine speed or transmission Input Shaft speed.

FMI 5 – Current Below Normal or Open Circuit: ECA detects an open on the ECA Speed Sensor signal circuit at key on.

Fallback

All FMIs

“F” flashes in gear display.
Service light flashes (if equipped).
No fallback mode is associated with this fault. TECU uses the vehicle engine speed signal, broadcast over J1939, to operate the transmission.

Conditions to Set Fault Code Inactive

All FMIs: TECU detects the ECA Speed Sensor signal for 2 seconds.

Possible Causes

FMI 2

ECA Speed Sensor
- Debris build-up on ECA Speed Sensor
- Mis-adjusted Thread-In ECA Speed Sensor
- Contaminated, worn, broken or missing flywheel ring gear teeth (thread-in ECA Speed Sensor)
- Broken or missing or Clutch Cover lugs (push-in ECA Speed Sensor)

ECA
- Internal failure

FMI 5

ECA Speed Sensor
- Open wiring

Transmission Harness
- Bent, spread, corroded or loose terminals
- Wiring shorted to ground, shorted to power or open

ECA
- Internal failure

Component Identification


1. Transmission Electronic Control Unit (TECU) 2. 38-Way Transmission Harness Connector 3. Gen1 ECA Shield 4. Gen1 Electronic Clutch Actuator (ECA) 5. 8-Way Gen1 ECA Connector

1. Transmission Electronic Control Unit (TECU)

2. 38-Way Transmission Harness Connector

3. Gen1 ECA Shield

4. Gen1 Electronic Clutch Actuator (ECA)

5. 8-Way Gen1 ECA Connector


1. Transmission Electronic Control Unit (TECU) 2. 38-Way Transmission Harness Connector 3. 8-Way Gen1 ECA Connector 4. 2-Way Gen1 ECA Speed Sensor Connector Body 5. 2-Way Gen1 ECA Speed Sensor

_Graphics/LineArt/TRTS0940_FC65_Wiring.png

1. Transmission Electronic Control Unit (TECU)

2. 38-Way Transmission Harness Connector

3. 8-Way Gen1 ECA Connector

4. 2-Way Gen1 ECA Speed Sensor Connector Body

5. 2-Way Gen1 ECA Speed Sensor

Fault Code 65 Troubleshooting Gen1 ECA

Purpose:Identify ECA installed on transmission.

Inspect ECA OEM Power Supply Connector, reference image below.

If equipped with a Gen1 ECA, Go to Step B

If equipped with a Gen2 ECA, go to Fault Code 65: Gen2 ECA Speed Sensor.

Purpose:Check for Active or Inactive fault codes.

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

If Fault Code 56 with FMI 2 is Active, go to Fault Code Isolation Procedure Index.

If Fault Code 65 with FMI 2 or 5 is Active or Inactive, Go to Step C

Purpose: Compare J1939 engine speed RPM and transmission clutch input speed RPM.

Set vehicle parking brake and chock wheels.
Key on with engine on at idle.
Connect ServiceRanger.
Select “Data Monitor”.
Select “Speed”.
Select “Engine speed” and add parameter “Engine-190”.
Select “Transmission clutch input speed” and add parameter “Transmission - 5052”.
Monitor vehicle tachometer and record engine RPM value in table.
Monitor ServiceRanger and record “Engine speed” RPM value in table.
Monitor ServiceRanger and record “Transmission clutch input speed” RPM value in table.
Notice
Do not depress the service brake when recording RPM readings.
Compare reading(s) in table.

If reading(s) are out of range, Go to Step D

If reading(s) are in range, Go to Step E

Engine Speed Signal Source	Range	Reading(s)
Vehicle Tachometer	Idle RPM
Parameter “Engine-190”	Within 150 RPM of Engine Idle RPM
Parameter “Transmission- 5052”	Within 150 RPM of Engine Idle RPM

Purpose:Identify engine speed signal that is out of range.

Compare reading(s) recorded in Step B table.

If Parameter “Engine - 190” RPM is out of range of Vehicle Tachometer Idle RPM, refer to OEM guidelines for repair or replacement of OEM Engine Speed Sensor signal. Go to Step V

If Parameter “Transmission - 5052” RPM is out of range of Vehicle Tachometer Idle RPM, Go to Step E

Purpose:Check for Active or Inactive fault codes.

Retrieve fault code(s) recorded in Step A.

If Fault Code 65 with FMI 2 or 5 is Inactive, Go to Step F

If Fault Code 65 with FMI 2 or 5 is Active, Go to Step G

Purpose:Use Product Diagnostic (PD) Mode to locate intermittent failures.

Set parking brake and chock wheels.
Place transmission in PD Mode. See more about Product Diagnostic (PD) Mode.
Note: Transmission does not enter PD Mode when Active fault codes exist.
Wiggle wiring and connections of the Transmission Harness from the 2-Way Gen1 ECA Speed Sensor to the 8-Way Gen1 ECA Connector. Look for signs of pinched or chafed wiring. Verify all connections are clean and tight.
Exit PD Mode by powering down.
Notice
Allow 2–3 minutes for the TECU to perform a complete power-down sequence before proceeding.

If any fault code sets Active while wiggling the Transmission Harness, replace Transmission Harness. Go to Step V

If any fault code sets Active while wiggling the ECA Speed Sensor wiring, replace Electronic Clutch Actuator (ECA) Speed Sensor. Go to Step V

If no fault code sets Active, Go to Step G

Purpose:Verify resistance of Transmission Harness and ECA Speed Sensor circuit and not shorted to ground.

Key off.
Disconnect 8-Way Gen1 ECA Connector.
Inspect 8-Way Connector body for damage and bent, spread, corroded or loose terminals.
Measure resistance between 8-Way Connector Pin F and Pin G. Record reading(s) in table based on configuration.
Measure resistance between 8-Way Gen1 ECA Connector Pin F to ground. Record reading(s) in table.
Compare reading(s) in table.

If readings are out of range, Go to Step H

If readings are in range, Go to Step I

ECA Speed Sensor Config	Pins	Range
Transmission Clutch Housing	F to G	2.0k–4.5k Ohms
Engine Flywheel Housing	F to G	140–180 Ohms
Both	F to ground	Open Circuit (OL)

Purpose:Verify resistance of ECA Speed Sensor circuit and not shorted to ground.

Key off.
Disconnect 2-Way Gen1 ECA Speed Sensor Connector.
Inspect 2-Way Connector body for damage and bent, spread, corroded or loose terminals.
Measure resistance between 2-Way Gen1 ECA Speed Sensor Connector Pin 1 and Pin 2. Record reading(s) in table.
Measure resistance between 2-Way Gen1 ECA Speed Sensor Connector Pin 2 and ground. Record reading(s) in table.
Compare reading(s) in table.

If readings are in range, replace Transmission Harness. Go to Step V

If readings are out of range, replace Electronic Clutch Actuator (ECA) Speed Sensor. Go to Step V

ECA Speed Sensor Config	Pins	Range
Transmission Clutch Housing	1 to 2	2.0k–4.5k Ohms
Engine Flywheel Housing	1 to 2	140–180 Ohms
Both	2 to ground	Open Circuit (OL)

Purpose:Verify type of ECA Speed Sensor.

Inspect ECA Speed Sensor.

If equipped with Push-In Clutch Housing ECA Speed Sensor, Go to Step J

If equipped with Thread-In Flywheel Housing ECA Speed Sensor, Go to Step L

Purpose:Inspect Push-In Clutch Housing ECA Speed Sensor.

Key off.
Verify the Push-In ECA Speed Sensor is properly seated and installed in the Transmission Clutch Housing.
Remove ECA Speed Sensor. Inspect for signs of damage or debris build-up.

If no debris build-up or damage is present, Go to Step K

If sensor debris build-up or damage is found, inspect for cause of debris build-up or damage. Replace Electronic Clutch Actuator (ECA) Speed Sensor. Go to Step V

Purpose:Inspect Clutch Cover lugs.

Key off.
Remove single bolt for clutch housing access cover.
Inspect Clutch Cover for any damaged or missing lugs.

If any damage is found or lugs are missing, replace the ECA Clutch. Go to Step V

If the Clutch Cover is not damaged and all lugs are present, replace Electronic Clutch Actuator (ECA). Go to Step V

Purpose:Inspect Flywheel Housing Thread-In ECA Speed Sensor and adjustment.

Key off.
Verify the Thread-In ECA Speed Sensor is properly installed and adjusted in the Engine Flywheel Housing.
Note: Reference TRSM0930, Thread-In ECA Speed Sensor, Service Procedures.
Remove ECA Speed Sensor. Inspect for signs of debris build-up or damage.

If ECA Speed Sensor is properly installed and adjusted with no damage or debris build-up, Go to Step M

If ECA Speed Sensor is out of adjustment, perform Thread-In ECA Speed Sensor adjustment. Go to Step V

If ECA Speed Sensor is damaged or debris build-up is evident, inspect for cause of damage or debris build-up. Replace Electronic Clutch Actuator (ECA) Speed Sensor. Go to Step V

Purpose:Inspect flywheel for damage.

Key off.
Inspect Engine Flywheel Ring Gear for debris, wear or damage.

If flywheel damage is found, refer to OEM guidelines for repair or replacement of Engine Flywheel. Go to Step V

If no flywheel damage is found, replace Electronic Clutch Actuator (ECA). Go to Step V

Purpose:Verify repair.

Key off.
Reconnect all connectors and verify that all components are properly installed.
Key on with engine off.
Clear fault codes using ServiceRanger.
Drive vehicle and attempt to reset the code or duplicate the previous complaint.
Check for fault codes using ServiceRanger.

If no fault codes set Active and vehicle operates properly, test complete.

If Fault Code 65 sets Active during the test drive, Go to Step A

If a fault code other than 65 sets Active, troubleshoot per Fault Code Isolation Procedure Index.