2022.10.7
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261
TRSM0940 Appendix | Grade Sensor Calibration
Grade Sensor Calibration
The Transmission Electronic Control Unit (TECU) uses a
Grade Sensor to calculate vehicle incline or grade. The
grade position is used for the Hill Start Aid (HSA) feature
and provides information to assist in vehicle launch and
shifting. The Grade Sensor is internal to the TECU. Fault
Code 68 FMI 13 indicates a Grade Sensor Calibration is
required.
The Grade Sensor is calibrated via ServiceRanger or an
Operator-Triggered Procedure.
Note: Verify the following prior to performing the Grade
Sensor Calibration with ServiceRanger or the Operator Trig-
gered Procedure:
1. Vehicle must be on level ground before
initiating
the grade sensor
calibration.
2. Verify the suspension is fully aired.
3. Verify the suspension is set to proper height.
4. Ground surface must be within +/-
0.5% grade
(0.28 degrees) from
level.
5. Maximum allowable grade is +/- 0.5
degrees
(0.87% grade) from
level.
ServiceRanger Procedure
1. Set vehicle parking brake and chock wheels.
Note: Verify vehicle is parked on level ground and the
suspension is fully aired (if equipped) and set to proper
ride height.
2. Key on with engine off.
3. Connect ServiceRanger.
4.
Go To “Service
Routines.”
5. Select "Start" Grade Sensor Calibration.
6. Follow on-screen prompts.
Operator-Triggered Procedure
1. Set vehicle parking brake and chock wheels.
Note: Verify vehicle is parked on level ground and the
suspension is fully aired (if equipped) and set to proper
ride height.
2. Key on with engine off.
3. Select Low mode
with the Transmission Driver
Interface Device.
4.
Select Upshift Requests until the Display
indicates
"6".
5.
Depress and hold the Accelerator Pedal to the floor.
6. When the Display indicates a "Down
Arrow", release
the Accelerator
Pedal.
7. When the Display indicates "0", select Neutra
l
mode.
8. Key off and allow the TECU to perform a comp
lete
po
wer down sequence.
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