NHTSA ID Number: 10214308
Manufacturer Communication Number: DSM.0053
TSB/Document Date: 2022-06-21
Summary
Service manual
for Hexagon Agility® 488LPI propane autogas (LPG) engine electrical components and sensors.
Propane Autogas
Engine Electrical and Sensors
Service Manual
DSM.0053 Ver. 1.0
May 26, 2022
PRINTED AND DOWNLOADED COPIES ARE UNCONTROLLED
Hexagon Agility Inc. Copyright ©2022. All Rights Reserved.
DSM.0053 Ver. 1.0 05/26/2022
488LPI Propane Autogas Engine
Electrical and Sensors Manual
Page 2 of 31
Preface
This manual is designed as a support document for trained technicians in the maintenance and service
procedures of the 488LPI™ propane autogas engine and fuel system provided by Hexagon Agility®.
No attempt shall be made to install, maintain, or repair this product until this manual and all referenced supporting
documentation have been read and fully understood.
Original Equipment Manufacturer (OEM) parts not serviced by Hexagon Agility® may be obtained by contacting
Freightliner Custom Chassis Corporation or Thomas Built Buses.
Fuel system warranty or non-warranty product support may be obtained by calling or emailing Hexagon Agility®
Customer Care and Technical Services (CCTS).
Please provide your name, phone number, email address, and complete vehicle information: VIN, year,
make, model, mileage, unit number, vehicle owner, and current vehicle location. A service advisor will
contact you to arrange vehicle repair or ship a part.
®
All parts must adhere to the accepted standards and ratings as specified by Hexagon Agility . Use of
®
any part that is not approved by Hexagon Agility is not recommended and may compromise the integrity
and safety of the system.
Do not remove components from original packaging until necessary. Any components that are to be
reinstalled must be thoroughly cleaned, inspected, and stored in a satisfactory manner until
reinstallation.
DSM.0053 Ver. 1.0 05/26/2022
488LPI Propane Autogas Engine
Electrical and Sensors Manual
Page 3 of 31
Table of Contents
Preface
Acronyms
Safety
Warning and Signal Words Used in this Manual
Qualified Personnel
Engine Harness Component Diagram
Repair Procedures
Camshaft Position (CMP) Sensor
Crankshaft Position (CKP) Sensor
Engine Control Module (ECM)
Engine Coolant Temperature (ECT) Sensor
Engine Harness
EVAP Purge Solenoid
Fuel By-Pass Solenoid
Fuel Pressure/Temperature (FPT) Sensor
Ignition Coil
Manifold Absolute Pressure (MAP) Sensor
Mass Air Flow (MAF) Sensor
Spark Plug Inspection
Spark Plug Wire Inspection
Torque Security Module (TSM)
References
Electrical Component and Sensor Torque Specifications
Ignition System Specifications
DSM.0053 Ver. 1.0 05/26/2022
488LPI Propane Autogas Engine
Electrical and Sensors Manual
Page 4 of 31
Acronyms
CKP
crankshaft position sensor
CMP
camshaft position sensor
electronic control module
ETC
electronic throttle control sensor
ECT
engine coolant temperature sensor
evaporative emissions
FPT
fuel pressure/temperature sensor
liquid propane gas
LPI
Liquid Propane Injection
MAP
manifold absolute pressure sensor
TSM
torque security module
DSM.0053 Ver. 1.0 05/26/2022
488LPI Propane Autogas Engine
Electrical and Sensors Manual
Page 5 of 31
Safety
Hexagon Agility® provides safety guidelines to ensure the safety of personnel servicing and / or operating liquid
propane gas 1 (LPG) equipment. All personnel involved must adhere to industry standards, specialized training,
and all federal, state, and municipal laws and regulations.
Hexagon Agility® minimizes potential hazards through state-of-the art design and testing practices. Always
observe the procedures and recommendations of this manual.
Due to the presence of high-pressure and flammable fuel, LPG fuel systems are a form of hazardous energy
storage.
Warning and Signal Words Used in this Manual
WARNING indicates a hazardous situation which, if not avoided, could result in death
or serious injury.
CAUTION indicates a hazardous situation which, if not avoided, could result in minor or
moderate injury.
NOTICE is used to address practices not related to physical injury, such as best
practices or tips to help an operation or procedure go smoothly and prevent equipment
damage.
Critical
Characteristic
Product feature directly affects:
Safety of vehicle users, people nearby and maintenance personnel, or
Regulatory compliance.
Qualified Personnel
LPG systems must be maintained and inspected exclusively by trained personnel with qualifications in
accordance with the applicable codes.
Individuals involved in any aspect of LPG fuel system maintenance, emergency response, servicing or
testing must be properly trained. Individuals who are not trained are not permitted to service, maintain,
test, or inspect a system.
1
LPG used for automotive applications is often referred to as “propane autogas.”
DSM.0053 Ver. 1.0 05/26/2022
488LPI Propane Autogas Engine
Electrical and Sensors Manual
Page 6 of 31
Engine Harness Component Diagram
C4
Torque
Security
Module
FRONT
C31
Fuel
Supply
Solenoid
C5-A
CAN 1
Terminal
Resistor
C17d
Ignition
Coil 7
C15B
LH Pre-Cat.
HEGO
Sensor
C32
Fuel
By-Pass
Solenoid
C15A
RH Pre-Cat.
HEGO
Sensor
ECM J1-B
(Brown)
ECM J1-C
(Gray)
ECM J1-A
(Black)
C28
Bulkhead
Connector
C20
Ground
Ring
C21
Ground
Ring
C5-B
CAN 2
Terminal
Resistor
C17c
Ignition
Coil 5
C14
Engine Coolant
Temperature
Sensor
C22
Fuel
Temperature/
Pressure
Sensor
C7
Manifold
Absolute
Pressure
Sensor
C19d
Ignition
Coil 8
C17b
Ignition
Coil 3
C17a
Ignition
Coil 1
C10
Oil
Pressure
Sensor
C16
Fuel Injector
Harness
C9
Electronic
Throttle Control
Sensor
C6
Mass Air Flow
Sensor
C19c
Ignition
Coil 6
C19b
Ignition
Coil 4
C19a
Ignition
Coil 2
DSM.0053 Ver. 1.0 05/26/2022
C12
Camshaft
Position
Sensor
488LPI Propane Autogas Engine
Electrical and Sensors Manual
C11
Crankshaft
Position
Sensor
Page 7 of 31
Repair Procedures
FRONT
DSM.0053 Ver. 1.0 05/26/2022
488LPI Propane Autogas Engine
Electrical and Sensors Manual
Page 8 of 31
Camshaft Position (CMP) Sensor Replacement
DESCRIPTION AND OPERATION
The Camshaft Position (CMP) Sensor uses electromagnetic field variations to detect Camshaft
Sprocket rotation and speed to report Camshaft position to the ECM (Electronic Control Module).
The CMP Sensor bolts to the Front Engine Cover and connects to the Engine Wiring Harness.
REMOVAL PROCEDURE
1. Secure vehicle on an approved lift and
lift vehicle.
2. Verify engine is off.
3. Disconnect CMP Sensor Electrical
Connector (2) from Engine Harness (3).
Figure 1
4. Remove CMP Sensor Retaining Bolt
(not shown) from Engine Front Cover
(1). Figure 1
5. Remove CMP Sensor from Engine
Front Cover (1). Figure 1
6. Inspect CMP Sensor and O-ring for
wear, cracks or other damage.
CMP Sensor must be replaced if Oring is damaged.
2
3
1
Figure 1:
Camshaft (CMP) Sensor Electrical Connector
location (2), Engine Harness (3), Engine Front
Cover (1)
INSTALLATION PROCEDURE
1. Lubricate CMP Sensor O-ring with
clean engine oil.
2. Install CMP Sensor in Front Engine
Cover (1). Figure 1
3. Install and tighten CMP Sensor
Retaining Bolt (not shown). Refer to
Electrical Component & Sensor Torque
Specifications.
4. Connect CMP Sensor Electrical
Connector (2) to Engine Harness (3).
Figure 1
5. Lower vehicle.
6. Verify proper operation.
DSM.0053 Ver. 1.0 05/26/2022
488LPI Propane Autogas Engine
Electrical and Sensors Manual
Page 9 of 31
Crankshaft Position (CKP) Sensor Replacement
DESCRIPTION AND OPERATION
The Crankshaft Position (CKP) Sensor detects crankshaft rotation and speed by monitoring the
Crankshaft Reluctor Wheel to report crankshaft position to the ECM (Electronic Control Module).
The CKP Sensor bolts into the passenger side of the Engine Front Cover and connects to the
Engine Wiring Harness.
REMOVAL PROCEDURE
1. Secure vehicle on approved lift and
raise vehicle.
2. Verify engine is off.
3. Disconnect CKP Sensor Electrical
Connector (2) from Engine Harness (3).
Figure 1
4. Remove CKP Sensor Retaining Bolt
(not shown) from Engine Front Cover
(1). Figure 1
5. Remove CKP Sensor from Engine
Front Cover (1). Figure 1
6. Inspect CKP Sensor and O-ring (not
shown) for wear, cracks or other
damage.
FRONT
1
3
CKP Sensor must be replaced if Oring is damaged.
DSM.0053 Ver. 1.0 05/26/2022
2
Figure 1:
Camshaft (CKP) Sensor Electrical Connector
location (2), Engine Front Cover (1),
Engine Harness (3)
488LPI Propane Autogas Engine
Electrical and Sensors Manual
Page 10 of 31
INSTALLATION PROCEDURE
1. Lubricate CKP Sensor O-ring (not
shown) with clean engine oil.
2. Install CKP Sensor in Front Engine
Cover (1). Figure 1
3. Install and tighten CKP Sensor
Retaining Bolt (not shown). Refer to
Electrical Component & Sensor Torque
Specifications.
4. Connect CMP Sensor Electrical
Connector (2) to Engine Harness (3).
Figure 1
5. Lower vehicle.
6. Verify proper operation.
DSM.0053 Ver. 1.0 05/26/2022
488LPI Propane Autogas Engine
Electrical and Sensors Manual
Page 11 of 31
Engine Control Module (ECM) Replacement
DESCRIPTION AND OPERATION
The Engine Control Module (ECM) monitors and directs engine operation. The ECM connects to
the Engine Harness via three (3) electrical connectors and attaches to the Upper Intake Manifold
using three (3) bolts.
ECMs are unique to each vehicle and must be programmed according to Vehicle
Equipment Programming Stations (VEPS). Please contact Hexagon Agility®.
REMOVAL PROCEDURE
4
1. Secure vehicle.
2. Ignition OFF.
3. Disconnect ECM Engine Harness
Electrical Connectors (2) from Electronic
Control Module (ECM) (1). Figure 1
4. Remove three (3) ECM Mounting Bolts (4).
Figure 1.
5. Remove ECM (1) from Upper Intake
Manifold (6). Figure 2
2
3
1
Figure 1:
ECM (1), Engine Harness ECM Electrical Connectors
(2), Engine Harness (3), ECM Mounting Bolts (4)
INSTALLATION PROCEDURE
1. Install ECM (1) on Upper Intake Manifold (6)
using three (3) ECM Mounting Bolts (4) and
tighten. Figures 1 & 2. Refer to Electrical
Component & Sensor Torque
Specifications.
2. Connect three (3) Engine Harness Electrical
Connectors (2) to ECM Electrical Connector
locations (5).
Verify connector security locks are
firmly in place. Figures 1 & 2
3. Verify proper operation.
DSM.0053 Ver. 1.0 05/26/2022
6
1
4
5
Figure 2:
ECM (1), ECM Electrical Connector locations (5),
ECM Mounting Bolts (4)
488LPI Propane Autogas Engine
Electrical and Sensors Manual
Page 12 of 31
Engine Coolant Temperature (ECT) Sensor Replacement
DESCRIPTION AND OPERATION
The Engine Coolant Temperature (ECT) Sensor measures coolant temperature using variable
resistance with temperature and sends readings to the Engine Control Module (ECM). The ECM
uses ECT data and inputs from other sensors to adjust fuel injection and ignition timing.
The ECT sensor attaches to the Engine Harness via a pigtail connector and threads into the
middle of the driver side Cylinder Head.
REMOVAL PROCEDURE
1. Secure vehicle.
2. Ignition OFF.
3. Drain cooling system below level of
Engine Coolant Temperature (ECT)
Sensor. Follow OEM procedure.
4. Disconnect ECT Sensor Pigtail
Electrical Connector (2) from Engine
Harness (5). Figure 1
5. Remove ECT Sensor (3) from driver
side Cylinder Head (1) using a socket.
Figure 1
Handle ECT Sensor carefully.
FRONT
5
2
3
Figure 1:
ECT Sensor Pigtail Electrical Connector (2),
ECT Sensor (3), Engine Harness (5),
Driver side Cylinder Head (1)
1
INSTALLATION PROCEDURE
1. Apply sealant to ECT Sensor Threads
(4). Figure 2
2. Install ECT Sensor (3) in driver side
Cylinder Head (1) using a socket.
Figure 1. Refer to Electrical
Component & Sensor Torque
- 3X Stronger than the leading full synthetic*
- 10X Better high stress performance**
- 20,000 miles between oil changes***
- Viscosity breakdown as measured in Kurt Orbahn test on 5W...
- As measured in Seq IX test under high load/torque conditions...
If the PDF is very large, it may not load in the preview below.
Some older TSBs had multiple PDFs — visit the NHTSA Website to view all PDFs.
If the TSB PDF does not show, download or view it on the NHTSA Website.
Click on the (+) Plus Sign
Then Click on Associated Document(s)
Search NHTSA Database for Recalls
Search NHTSA Database for Vehicle Investigations
View Latest Vehicle Investigations
Search NHTSA Database for Vehicle Complaints
View Latest Vehicle Complaints
TSB/Document ID: DSM.0053
Replacement Service Bulletin Number:
MFR Communication Date: 2022-05-26
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
- [Notice] When you receive a used device, it may be a customer return resold by Amazon without inspection. You can exchange it for a new one through Amazon. As this situation is unavoidable, we sincerely apologize. For any issues, contacting us via Amazon's "Messages" is the best way. THINKSCAN 689BT Bidirectional Scan Tool Can Be Used Immediately After It is Turned On, Without Complicated Registration Process, Which is More Convenient & Quick.
- Full Bi-Directional Control & 3000+ Active Tests: Take control and test components like actuators, fuel injectors, relays, and cooling fans in real time. You’ll quickly see if the problem is in the part itself or the control module — saving you hours of guesswork and frustrating trial-and-error.
- Advanced ECU Coding Capabilities: Handle module matching and hidden feature activation with confidence. When you replace an ECU or want to customize settings, this obd2 scanner diagnostic bi directional tool gives you the professional-level capabilities you need without the dealership price tag.
- 34+ Useful Reset and Maintenance Functions: Complete everyday service tasks smoothly with a wide range of helpful reset and maintenance functions. Whether you’re keeping up with regular upkeep or tackling a specific job, this scanner makes maintenance simpler and less stressful for both DIYers and pros.
- Comprehensive Full System Diagnostics: Diagnose every major system — Engine, Transmission, ABS, SRS, TPMS, and more — all in one place. Finally stop wondering if you’re missing something important; get the full picture and clear codes with ease.
- Top Reasons to Choose the D7S OBD2 Scanner: XTOOL D7S car scan tool, an upgrade of XTOOL D7, offers comprehensive features for automotive technicians, workshops, and DIY enthusiasts 1. Upgraded Hardware: 2+64GB memory, rear camera, intuitive interface, foldable bracket 2. Complete Diagnostics: FCA
Autoauth, OE-level all system scan, 39+ maintenance services, 4K+ bidirectional, CANFD/DoIP protocol 3. Advanced Capabilities: ECU coding, PMI functions 4. Wide Compatibility: Support 10,000+ models, covering 99% vehicle brands 5. Multi-language: Available in 22+ languages, No IP Restrictions 6. 3-Year Updates: Save 300 bucks on software updates for the latest features and optimizations - 2026 Upgraded D7S Car Scanner Features: The newly 2026 D7S V2.0 scanner for car brings exciting features for advanced vehicle diagnostics and enhanced user experience 1. FCA AutoAuth: Now supports FCA SGW module for Chrysler, for Jeep, for Dodge (2018+), for Fiat (2017+), enabling faster vehicle communication without gateway restrictions 2. PMI (Offline ECU Programming): Allows for Ford, for Lincoln, and for Mazda ECU programming for new modules 3. Optimized Diagnostic Report 2.0: Personalized reports with logos and customer info for auto shops. Note: Compatibility varies by cars, please check before order
- Cost-effective ECU Coding Scan Tool for Specific Brands: Enhance your vehicle's performance with XTOOL D7S! This obd2 scanner all systems bidirectional offers advanced capabilities at an affordable price, supports online for BMW, for Benz and offline for BENZ, for MIT, along with PMI functions for Ford, for Mazda, and for Lincoln. Ideal for technicians and DIY enthusiasts, this automotive scanner diagnostic tool optimizes vehicle performance and enhances the driving experience. Note: Not for all cars and modules, please send car VIN to check the compatibility before purchase
- OE All System Diagnostic & 8 Pids Graphing: XTOOL D7S is a comprehensive all system bi directional obd2 scanner that delivers dealer-level diagnostics, completely controlling over your vehicle’s performance and health. This automotive scan tool can read and clear DTCs, view live data and ECU information, retrieve freeze frames, and perform active tests and full obd2 functions. This bi-directional scan tool can can identify your vehicle's make, model, and year information with just one click and show up to 8 PIDs live data with options for CSV viewing, playback, and recording for in-depth analysis. It is easy-to-use for both professionals and beginners, helping pinpoint issues efficiently
- 3 Years Software Update, Value for Money: With 3 years of software updates and 22+ languages(no IP restrictions), XTOOL D7S auto scanner code scanner ensures ongoing compatibility for the latest car models and improved diagnostic functions. This all system vehicle diagnostic scanner comes with a 30-day return policy and a 24-month repair for dependable performance. XTOOL are dedicated to your satisfaction, so enjoy seamless support and lifetime expert assistance. Should you encounter any issues or concerns, don’t hesitate to reach out XTOOL. D7S with newest update with 22 languages freely transfer without authorization, check details from setting-language or from XTOOL
- 【✅Compared to BOSSCOMM IF742, IF745 Offers Full-System Diagnostics】The BOSSCOMM IF745 car diagnostic scanner is an upgraded model of IF742. In addition to supporting all OBD2 Code Reader functions and 6 reset options (ABS/EPB/SAS/BMS/Oil/Throttle), it expands diagnostics from 4 systems (Check Engine/ABS/SRS/Transmission) to vehicle All systems, including Steering, Suspension, and Body Electronics. This provides deeper, more comprehensive diagnostic capabilities.
- 【✨10 OBD2 Functions】The BOSSCOMM IF745 scan tool’s DTC Lookup instantly translates fault codes into user-friendly explanations, its I/M Readiness feature streamlines emissions testing with a single tap, and Freeze Frame lets you pinpoint the exact moment of a fault for in-depth root-cause diagnosis. Combined with a live data dashboard and advanced diagnostics (O2S, OBMon, EVAP), it delivers comprehensive insights for confident troubleshooting.
- 【✨Deep Diagnostics for All Vehicle System Modules】Beyond code reading/clearing and ECU information retrieval, our all-in-one data stream feature lets you inspect all current fault codes and their locations across the vehicle’s systems. This vehicle code reader helps you turn off dashboard warning lights and perform a comprehensive self-check of your car at home—no more back-and-forth trips to the repair shop or hefty inspection fees.
- 【✨6 Essential Resets: ABS Bleeding, Oil, EPB, SAS, Throttle, BMS】The BOSSCOMM IF745 obd2 scanner diagnostic tool swiftly purges air from brake lines to restore braking sensitivity, fine-tunes maintenance cycles to eliminate false alerts, resolves parking brake issues with one-click control, recalibrates steering sensors for stability, optimizes engine idling/acceleration for smoother performance, and deeply resets battery systems to extend lifespan and range via precise parameter adjustments.❗NOTE: Does NOT support bidirectional control, coding, or programming.
- 【✨10,000+ Car Models, AutoVIN, 13 Languages】The BOSSCOMM IF745 vehicle scanner diagnostic tool covers 73+ global car brands and offers support in 13 languages, making it perfect for DIYers, auto mechanics, or as a thoughtful gift. With a single-click AutoVIN feature, it instantly retrieves vehicle serial numbers, streamlining diagnostics for users globally. This adaptable tool balances user-friendliness with precision, catering to both personal and professional requirements.✅Unsure about compatibility? Compatibility will vary on vehicles' model and year, pls reach us via 📧 [email protected] 📧 before purchase.
This product presentation was made with AAWP plugin.