Countries: CANADA, UNITED STATES Document ID: 1K0800563
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Availability: ssi Revision: 5
i WN Major System: ELECTRICAL SYSTEM Created: 2/28/2018
Current English bast 4128/2023

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Title: LT with feature code 08TSJ Auto Start Stop Information and Troubleshooting

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Applies To:LT with 08TSJ

Change Log

Please refer to the change log text box below for recent changes to this article:

04/25/2023 - Updated Auto Start and Stop Temperature Parameter IDs to match newer BCM software levels.

108/26/2022 - Author change. Added note to Cummins minimum idle shutdown temperature threshold.

106/08/2021 - Corrected typo in feature number 597041

106/18/2020 - Repair hyperlink. No content changes

11/20/2018 - Updated feature information under ‘Description’; There are separate features for Cummins engines and International ¥

tengines. Added information for sleeper auto climate which also interacts with auto start/stop.

Description

Feature code 0008TSJ for auto start stop is a feature that will allow you to preset values in the body controller to allow the
truck to start when the battery voltage or engine oil temperature reaches the preset value. The engine will then run for a
preset time after battery voltage is within programmed value (if the engine started for low voltage) or the engine will run
until oil temperature reaches a programmed value (if the engine started for oil temperature).

Interlocks
(Conditions must be met to allow engine cranking)

¢ Transmission is in neutral

Shifter is in neutral

© Parking brake is set

© Clutch is not depressed (for transmissions with clutch pedal)

© Hood is closed (hood switch)

e Vehicle Speed is less than 2 mph (3 km/h)

© Ignition switch is in the OFF position

¢ Auto Start Stop switch is turned ON within 30 seconds of key OFF

Factory Settings for 0597041 - BCM PROG, AUTO START STOP with Switch Control,
with Oil Temperature Sensor With Cummins Engine

Starting for Low Voltage Starting for Low Oil Temperature

e Low voltage threshold is 12.1v e Low engine oil temp threshold is SOF

After battery voltage is under 12.1v for 30 seconds,
the horn will chirp, and the engine will start

5 seconds after the engine starts, the engine speed
will increase to 1000rpm

Once battery voltage is 12.7v for 70 minutes
continuously AND engine oil is 100F, the engine
will return to idle

The engine will idle for 90 seconds before engine
shutdown

After engine oil temp is under 50F for 15 minutes,
the horn will chirp, and the engine will start

5 seconds after the engine starts, the engine speed
will increase to 1000rpm

Once engine oil temp is 100F for 1 minute
continuously AND battery voltage is 12.7v, the
engine will return to idle

The engine will idle for 90 seconds before engine
shutdown

Factory Settings for 0597250 - BCM PROG, AUTO START STOP with Switch Control

with Internatio:

nal A26 Engines

Starting for Low Voltage

Starting for Low Temperature

Low voltage threshold is 12.1v

After battery voltage is under 12.1v for 30 seconds,
the horn will chirp, and the engine will start

5 seconds after the engine starts, the engine speed
will increase to 1000rpm

Once battery voltage is 12.7v for 70 minutes
continuously AND engine oil is 150F, the engine
will return to idle

The engine will idle for 90 seconds before engine
shutdown

Low temp threshold varies based on the ambient
temperature at the time auto start was enabled
Time to start decreases at colder ambient

temperatures
¢ Timers vary from:
© 7 hours © 4hours
o 5.5hours o 3 hours

5 seconds after the engine starts, the engine speed
will increase to 1000rpm

Once engine oil temp is 150F for 1 minute
continuously AND battery voltage is 12.7v, the
engine will return to idle

The engine will idle for 90 seconds before engine
shutdown

Factory Settings for 0597317 - BCM PROG, AUTO CLIMATE CONTROL for Sleeper

with AN

Y Engine

© When bunk temperature gets too warm or cold, this feature can request the engine to auto-start to cool or

heat the sleeper

© This is an optional feature (16VKW) that also interacts with the Auto Start-Stop system

Starting for High In-Cab Temperature

Starting for Low In-Cab Temperature

e Bunk temperature reaches upper limit (5 degrees
above set temperature point) the engine will start
and run to cool the sleeper

The engine will run for a 20 minutes, to cool the
sleeper.

The engine will remain off for 15 minutes
minimum after it shuts down

When ambient temperatures are 90F or hotter, the
engine will run continuously to maintain sleeper
temperature

e Bunk temperature reaches lower limit (5 degrees
below set temperature point) the engine will start
and run to warm the sleeper

© The engine will run for a 20 minutes, to warm the
sleeper.

© The engine will remain off for 15 minutes
minimum after it shuts down

When ambient temperatures are 15F or cooler, the
engine will run continuously to maintain sleeper
temperature

e If ambient temperature rises above 15F, the engine
will shut down

© If ambient temperature falls under 9OF, the engine
will shut down

Troubleshooting

The Body Control Module (BCM) handles all the inputs and controls the outputs for the auto start/stop system, including
engine cranking. This is a change from previous models with auto start/stop.

¢ Open Diamond Logic Builder (DLB) software and connect to the BCM. Open a session for the auto start/stop feature.
© For assistance in making a session in DLB follow |K2600008 - How to Diagnose Electrical Problems with Diamond
Logic® Builder

e Review the all inputs that could prevent the system from operating properly
o Was the auto start/stop switched on within 30 seconds of key off?

© Is the LED indictor on the switch lit solid?
© Slow flashing (One flash per second) - Interlock is not met
e Fast flashing (Two flashes per second) - Error condition

© Is the hood closed, and hood switch has a good status in DLB?
o Is the park brake set, and has a good status in DLB?
© Is the clutch pedal released, and has a good status in DLB?

o Is the current gear Neutral?
If the stalk shifter is left in gear the vehicle will not crank

© Does this vehicle see wheel based vehicle speed? (Transmission or ABS)
© Transmission output shaft speed (Vehicle_Speed)
e ABS wheel speed sensor (Front_Axle_Speed)
© If wheel based vehicle speed is seen during engine cranking, the system will stop engine cranking
© If wheel based vehicle speed is seen while running, the system will abort auto start and shut down

e Ifthe system is shutting down prematurely, review parameters to verify they are set properly

Parameter Information

e Below are updated ECM and Body Controller Auto Start Stop Default Settings, these settings provide optimal
performance.
o If the customer has Idle Shutdown Enabled, then Idle Shutdown With Parking Brake Set and In PTO must be set to
Disable
© If Idle Shutdown shuts the engine off during an Auto Start event, the Auto Start/Stop system will be disabled.
© The Diamond Logic Builder (DLB) Parameter list is designed for optimal battery life.
o Changing the parameters below may result in poor system performance or shortened battery life.

Idle Shutdown Enable

* Idle Shutdown Coolant

30 (some models only allow a