Solution K36340146
Thursday, December 6, 2018 7:54:44 PM CET

Mack Models
Cabover , Conventional

Mack Model

Volvo Models
Conventional

Volvo Model

Engine family
Engine family

11L Engine , 13L Engine , 16L Engine , MP7 , MP8 , MP10

Emission Standard
Emission Standard

US10+OBD13 , US14 , US15 , US16 , US17 , OBD2017 , 2018

** SOLUTION **
Title

Tech Tool Returns Error Code 140 Failed To Run On-Vehicle Test; Programming,
Calibration, Or Test Operations Fail In Premium Tech Tool (PTT), PTT Displays
Control Unit Information Correctly - US10+OBD13 And Newer Emissions, Common
Model Year 2014 And Newer
A power supply or ground connection issue to an Electronic Control Unit (ECU) that is

Cause

being tested can cause the ECU to go offline during the tests, especially if the test
requires higher current demand from the chassis.
S

There are several items to consider for this issue:

o
l

• Note: Failure to turn the key on before running a test will cause this error to appear.

u
t

• A compromised power supply or ground for the Transmission Electronic Control Unit (TECU) can be the

i

source of customer complaints and is not readily identified as the issue.

o
n

- Example: A customer report of shifting issues, no shifting, won’t go into gear or will not move after putting
in gear.
• The TECU may respond to parameter change requests and be seen in the product history in PTT but may
not respond correctly when performing tests or calibrations.
• A module may respond to all requests for information but when a test or calibration is requested the TECU
shuts down:
- Many tests and calibration operations cause a higher power demand.
- This drop in voltage and subsequent return to good voltage levels after the test fails is too fast for the fault
detection to trigger a fault for low voltage.
• The information displayed with the error in PTT may be misleading.

- In the example shown below, the flash screen in PTT looks like the ECU software is sending the error code
because it is processing a Routine—R1ALH—that is being run when the failure is detected.
Note: This error may appear in a separate window or in the right pane of the PTT screen itself. The
location of the error message will depend on the operation being performed.

- The actual message is indicating loss of communication with the vehicle.
- The recommended actions give a high level list of general items that could be tried to correct the issue.
- If the recommended actions do not correct the problem then the individual circuits to the specific ECU
that is being tested should be investigated as outlined below.

When erratic behavior such as this occurs:
Checking and cleaning the battery connections and the main ground stud on the frame can help correct
general voltage and performance issues with the chassis.
The power and ground circuits can be monitored for voltage drops during the tests
1. Using the correct breakout box for the ECU being tested, check for drops in voltage while performing tests
that could take the module offline.
1.1. Using the MIN/MAX function on a Fluke meter will allow observation of the lowest value voltage
reaches while running operations and can catch fluctuations that may be missed.

2. The ECU that causes test failures can be supplied with a straight power and ground source routed through
a breakout box connected directly to the ECU connector.
2.1. Do not disconnect the normal power and ground supplies to the module.
2.2. Connect jumpers to the appropriate battery posts.
2.3. Run the jumpers directly to the corresponding points on the breakout box.
2.4. Rerun the test that failed previously.

3. If the test that had been failing completes, there is likely an issue in the wiring harness or connections.
3.1. Remove only the direct power supply from the breakout box. The negative jumper should stay connected.
3.2. Rerun the test that had failed prior to Step 2.
3.3. If the test fails after passing in Step 2: The issue is in the power supply circuit. Troubleshooting will
need to be performed to determine the problem with the circuit.
3.4. If the test passes after passing in Step 2: Reconnect the power circuit jumper to the breakout box.
Repeat steps 3.1 to 3.4 with the direct ground jumper to determine if it is the source of the issue.
as mentioned above.
Solution visibility

Dealer distribution

Support Area

CBR

Function(s)/component(s) affected
Function affected

Diagnostic tool , battery/power supply

Function Group
Function Group

170 General - Programming, Data Monitor, Vehicle Information

Customer effect
Main customer effect

calibration/programming/pairing/missing operation

Fault code(s)
OBD 2013 Diagnostic
Trouble Codes

Error 140

Administration
Author

UT9268H

Dealer ID

UT9268H

Last modified by

A241298

Creation date

26-10-2018 21:10

Date of last update

06-11-2018 22:11

Review date

01-11-2019 00:11

Status

Published

NA_Reviewer

Ut9268h

NA_Author_Group

GTT