Briggs & Stratton Vanguard EFI 380000 Istruzioni operative
380000 Repair Manual
80021829EN (Revision A)
BRIGGS&STRATTON, LLC
CUSTOMER EDUCATION
Milwaukee, WI 53201 USA
Copyright ©2020. All rights reserved.
VANGUARDPOWER.COM
Vanguard®EFI
Diagnostic and Repair
380000
REPAIR MANUAL
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Foreword
This manual was written to assist engine technicians and service personnel with the troubleshooting
and repair procedures for Briggs & Stratton® engines equipped with Electronic Fuel Injection (EFI). It
assumes that persons using this manual have been properly trained and are familiar with the service
procedures for these products, including the proper use of required tools and the application of
appropriate safety practices. Persons untrained or unfamiliar with these procedures or products should
not attempt to perform such work.
Proper repair is important to safe, reliable operation of all engines and engine-driven systems. The
troubleshooting and repair procedures described in this manual are appropriate for the Briggs & Stratton
engines described herein. Alternative methods or procedures may pose risks to both personal safety and
engine reliability and are not endorsed or recommended by Briggs & Stratton.
All information, illustrations, and specifications contained in this manual were based on the data available
at the time of publication. Briggs & Stratton, LLC reserves the right to change, alter, or otherwise improve
the product or the product manuals at any time without prior notice.
Copyright © 2020 Briggs & Stratton, LLC.
All rights reserved.
No part of this manual may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying or recording by any information storage and retrieval system, without
prior written permission from Briggs & Stratton, LLC.
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This engine troubleshooting and repair manual includes the following EFI equipped engine models:
• MODEL 380000
NOTE: Some models have limited service parts. Review theIllustrated
Parts Listfor part availability before conducting any service work.
NOTE: The images in this document are representative and may differ according to model.
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SECTION 1 - DIAGNOSTIC INTRODUCTION 1
SECTION 2 - TROUBLESHOOTING DTCs 2
SECTION 3 - WIRE SCHEMATICS AND PIN-OUTS 3
SECTION 4 - SYMPTOMS 4
SECTION 5 - REMOVAL/INSTALLATION 5
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SECTION 1 - DIAGNOSTIC INTRODUCTION
DIAGNOSTIC INTRODUCTION ----------------------------------------------------------------------------------------------------------------- 4
On-Board Diagnostic (OBD) System Check -------------------------------------------------------------------------------------------- 4
Diagnostic Trouble Codes (DTCs) --------------------------------------------------------------------------------------------------------- 4
Malfunction Indicator Lamp (MIL) ---------------------------------------------------------------------------------------------------------- 4
Data Link Connector (DLC) ------------------------------------------------------------------------------------------------------------------4
Non-Scan Diagnostics -------------------------------------------------------------------------------------------------------------------------4
Scan Diagnostics ------------------------------------------------------------------------------------------------------------------------------- 4
Install Service Power Supply Harness ----------------------------------------------------------------------------------------------------5
Use MIL to Read DTCs ---------------------------------------------------------------------------------------------------------------------- 5
Use Tiny Scan Code Reader to Read/Clear DTCs ----------------------------------------------------------------------------------- 5
Use Diagnostic Tool to Read/Clear DTCs ----------------------------------------------------------------------------------------------- 6
Back Probe Connector Terminals ----------------------------------------------------------------------------------------------------------6
Avoid ECM Damage ---------------------------------------------------------------------------------------------------------------------------6
Special Tools ------------------------------------------------------------------------------------------------------------------------------------ 7
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DIAGNOSTIC INTRODUCTION
On-Board Diagnostic (OBD) System Check
The basic steps of any diagnosis are as follows:
1. See Figure1. Observe the Malfunction Indicator
Lamp (MIL) with the engine running. If MIL is flashing,
then current Diagnostic Trouble Codes (DTCs) are
present.
NOTE:If engine will not start, install Briggs & Stratton
Service Power Supply Harness (Part No. 847252)
to observe MIL. SeeInstallService Power Supply
Harnessfor more information.
2. Read DTC(s) using MIL, Tiny Scan Code Reader,
orDiagnostic Toolsoftware.
3. To diagnose system problem(s), proceed to the
applicable Diagnostic Table(s) inSECTION 2 -
TROUBLESHOOTING DTCs.
4. Once the problem is located and corrected through
repair or replacement of faulty components, clear
DTC(s) using the Tiny Scan Code Reader or
theDiagnostic Toolsoftware.
NOTE:For information on the location or replacement
of specific components, seeSECTION 5 -
REMOVAL/INSTALLATION.
5. Start and run engine to validate repairs. Observe MIL
to verify that no DTCs are set.
6. If no DTCs are set, but engine performance issues
exist, seeSECTION 4 - SYMPTOMS.
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Diagnostic Trouble Codes (DTCs)
The ECM receives voltage signals from multiple sensors.
Each sensor functions within an established set of
parameters, which can be viewed as its operating
“window.”
When a malfunction or fault condition occurs, a change
in the signal voltage alerts the ECM that the sensor is
functioning outside its operating “window,” a DTC is set
and stored in ECM memory, and the MIL is illuminated.
A default value temporarily replaces the erroneous sensor
value to restore engine performance until the problem is
corrected.
Malfunction Indicator Lamp (MIL)
As a bulb and diagnostic system check, the MIL
illuminates when the engine is cranked. If it does not
illuminate during cranking, then a problem exists in the
MIL circuit.
When the engine is started, the MIL is extinguished if no
current fault condition exists. If the MIL flashes, it is an
indication that a current DTC is stored.
If the fault should correct itself, as in an intermittent
condition, the MIL is extinguished after a ten second
delay. The DTC remains stored in ECM memory as a
historic code until cleared by the technician. The MIL
does not indicate the existence of only historic codes.
Data Link Connector (DLC)
The DLC provides for direct communication with the
ECM. By plugging the Tiny Scan Code Reader, or laptop
withDiagnostic Tool, into the 6-pin connector in the EFI
wire harness, the DTCs stored in ECM memory can be
read and cleared.
Non-Scan Diagnostics
In the Non-Scan diagnostic mode, either the MIL or
the Tiny Scan Code Reader is used to read DTCs. The
technician then refers to the applicable Diagnostic Table
to troubleshoot the problem. Those tables labeledNon-
Scan Diagnosticsmust be used, as the data stream
provided by the ECM is not available for analysis.
Scan Diagnostics
In the more sophisticated diagnostic mode, theDiagnostic
Toolsoftware can facilitate the diagnosis of system
problems through an expanded interface with the ECM.
Through the use of data displays and menu selections,
the technician has access to “live” data for analysis.
It is important to note that the software is not a stand-
alone diagnostic tool for resolving DTCs, but must be
used in conjunction with the Diagnostic Tables for the
most efficient and effective diagnosis. Those tables that
are applicable to users with access to theDiagnostic
Toolsoftware are labeled asScan Diagnostics.
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Install Service Power Supply Harness
1. Obtain Briggs & Stratton Service Power Supply
Harness (Part No. 847252) and service battery.
2. Verify that service battery voltage is above 12v.
CAUTION
Observe the following precautions to avoid ECM
damage.
•Do not connect the harness directly to
a charging system or to a battery that is
connected to a charging system.
•Do not connect the harness to a battery that is
connected to the engine charging system.
•Although it may be used regardless of
whether the engine is running or not, do
not connect or disconnect the harness from
either the engine or battery while the engine is
running.
3. Install red wire alligator clip on Service Power Supply
Harness to battery positive (+) terminal.
4. Install black wire alligator clip on Service Power
Supply Harness to battery negative (-) terminal.
5. Connect Service Power Supply Harness to service
power supply connector on EFI wire harness. See A
of Figure2.
2
Use MIL to Read DTCs
1. SeeInstall Service Power Supply Harness.
2. When a DTC exists, the MIL begins to flash. See
Figure3.
NOTE:While each DTC actually begins with the
letter “P,” only the numeric characters are flashed.
3
3. Count the number of flashes to obtain the first of four
digits. If the first digit is zero, it is represented as a
series of ten flashes.
4. Count the number of flashes after the first one second
pause to obtain the second digit of the DTC.
5. Count the number of flashes after the second one
second pause to obtain the third digit, and then count
the number of flashes after the third one second
pause to obtain the fourth digit.
6. Write down each digit as it is displayed.
7. If there is more than one DTC, the next DTC begins
to flash after a three second pause.
8. After all DTCs are reported, the number “61” is
flashed to indicate this condition to the technician.
The flashing sequence is then restarted and the
technician may choose to verify the DTCs written
down or exit the routine.
NOTE:If “61” is the first code flashed, then no active
DTCs are set.
Use Tiny Scan Code Reader to Read/Clear
DTCs
NOTE:Always follow steps 1-9 for an accurate report of
current DTCs. Failure to do so may generate a report that
includes historic codes.
1. SeeInstall Service Power Supply Harness.
2. Wait for 30 seconds to elapse.
3. Connect Briggs & Stratton Tiny Scan Code Reader
(Part No. 19626) to DLC. See B of Figure2.
4. Turn Ignition ON, Engine OFF.
NOTE:If the Tiny Scan Code Reader cannot connect
to the ECM, “no-C” is displayed, which stands for “no
communication.” If communication is established, the
tool displays the number of DTCs read. For example,
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“dc-0” means that no DTCs were found, while “dc-4”
means that four DTCs are recorded.
5. Press the select button to cycle through the list of
DTCs.
6. Once the last DTC is displayed, “CLr?” appears.
Press and hold the select button until “Hold” changes
to “Done,” which indicates that all DTCs have been
“cleared” from ECM memory.
7. Disconnect service power supply connector for a
minimum of 20 seconds. See A of Figure 1-2.
8. Connect service power supply connector.
9. The tool displays the number of DTCs read.
10. Press the select button to cycle through the list of
DTCs. Write down each DTC as it is displayed.
Use Diagnostic Tool to Read/Clear DTCs
1. Obtain Briggs & Stratton Diagnostic Tool (Part No.
19636) with USB and Interface cables.
2. Connect one end of the USB cable to the Diagnostic
Tool and the other end to the USB port on the laptop.
3. Connect one end of the Interface cable to the
Diagnostic Tool and the other end to the DLC on the
EFI harness.
4. Turn Ignition ON, Engine OFF. The Diagnostic Tool
can take up to 30 seconds to connect to the engine.
5. See Figure4. Select theDashboardicon (A) in the
left sidebar to view theDealertab.
6. Observe the Current codes display (B).
NOTE:TheCHECK ENGINElight (C) is green if a
current fault code is present. To display a description
of the fault code, hover the cursor over the code.
4
NOTE:A Current codes display can also be viewed
under theTroubleshootingtab.
7. ClickClear(D) to erase both current and historic
DTCs.
NOTE:See the Briggs & Stratton EFI Diagnostic Tool
Software User Manual for more information.
8. Turn Ignition OFF.
Back Probe Connector Terminals
NOTE:Do not insert probes into terminals on the mating
side of any connector. The diameter of the test probes
can damage terminals.
1. Obtain Briggs & Stratton Back Probe Wire Set (Part
No. 19625).
2. Carefully slide metal pin on probe between the rubber
seal and wire insulation on the back side (wire end) of
the connector.
3. Gently push the pin in until it stops. Stop pushing
when the pin “bottoms out,” or when the plastic
sheath is very close to the connector housing.
DO NOTforce the pin into the connector as terminal
and/or probe pin damage can occur. Probe travel
may be stopped by contact with insulation or core
crimps. Try again after removing and re-positioning
probe pin.
IMPORTANT:
• Use care to avoid deforming connector terminals,
either by forcing the probe too far into the cavity
or by using a probe that is too large. If terminal
damage is suspected, test for proper terminal
contact.
• A deformed terminal can cause a poor
connection resulting in intermittent problems or
even complete component failure. Do not use
paper clips or other substitute devices as they
also can damage terminals.
• Do not probe through connector seals, wire
insulation, secondary ignition wires, boots, etc.
Damage can occur that is not readily apparent
and tiny holes can result in water intrusion, which
leads to corrosion and eventual component
failure.
Avoid ECM Damage
CAUTION
A surge in voltage, current or both, is called a
voltage spike. Voltage spikes can cause major
damage to the ECM.
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