Briggs & Stratton VANGUARD 810 EFI Istruzioni operative

ELECTRONIC FUEL INJECTION

SERVICE & DIAGNOSTICS

BRIGGS & STRATTON

BRIGGS&STRATTON

CORPORATION

POST OFFICE BOX 702

MILWAUKEE, WI 53201 USA

414 259 5333

BRIGGSandSTRATTON.COM

80021828-9/16

REPAIR MANUAL

ELECTRONIC FUEL

INJECTION

SERVICE & DIAGNOSTICS

Quality Starts With A

Master Service Technician

VANGUARD™ 810 EFI

BIG BLOCKTM EFI

Section 1: Diagnostic Introduction 1

Table of Contents

Page

Section 1: Diagnostic Introduction .......................................................................... 1

Section 2: Troubleshooting DTCs ........................................................................... 9

Section 3: Wire Schematics and Pin-Outs ............................................................. 73

Section 4: Symptoms ............................................................................................. 89

Section 5: Removal/Installation ............................................................................ 103

2 Section 1: Diagnostic Introduction

CAUTIONS

To reduce the chance of personal injury and/or property damage, the following instructions must

be carefully observed.

Proper service and repair are important to the safety of the service technician and the safe, reli-

able operation of all Electronic Fuel Injection (EFI) equipped engines. If part replacement is nec-

essary, the part must be replaced with one of the same part number or with an equivalent part.

Do not use a replacement part of lesser quality.

The service procedures recommended and described in this service manual are effective meth-

ods of performing service and repair. Some of these procedures require the use of tools speciﬁ-

cally designed for the purpose.

Accordingly, anyone who intends to use a replacement part, service procedure, or tool which is

not recommended by the manufacturer, must ﬁrst determine that neither his safety nor the safe

operation of the unit will be jeopardized by the replacement part, service procedure or tool se-

lected.

It is important to note that this manual contains various Cautions and Notices that must be care-

fully observed in order to reduce the risk of personal injury during service or repair, or the possi-

bility that improper service or repair may damage the unit or render it unsafe. It is also important

to understand that these “Cautions” and “Notices” are not exhaustive, because it is impossible

to warn of all the possible hazardous consequences that might result from failure to follow these

instructions.

All information, illustrations and speciﬁcations contained in this manual are based on the latest

product information available at the time of publication approval. The right is reserved to make

changes at any time without notice.

Section 1: Diagnostic Introduction 1

Section 1

Diagnostic Introduction

Page

On-Board Diagnostic (OBD) System Check ......................................................... 3

Diagnostic Trouble Codes (DTCs) ........................................................................ 3

Malfunction Indicator Lamp (MIL) ......................................................................... 3

Data Link Connector (DLC) ................................................................................... 3

Non-Scan Diagnostics .......................................................................................... 3

Scan Diagnostics .................................................................................................. 3

Use MIL to Read DTCs ......................................................................................... 4

Use Tiny Scan Code Reader to Read/Clear DTCs ............................................... 4

Use Electronic TechnicianAssistant (ETA) to Read/Clear DTCs .......................... 5

Back Probing Connector Terminals ....................................................................... 5

Avoiding ECM Damage ......................................................................................... 6

Special Tools ......................................................................................................... 7

Product Improvements/Field Upgrades ................................................................ 8

2 Section 1: Diagnostic Introduction

This page left

intentionally

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Section 1: Diagnostic Introduction 3

On-Board Diagnostic (OBD) System Check

The basic steps of any diagnosis are as follows:

1. Observe the Malfunction Indicator Lamp

(MIL) with engine running. If MIL is illu-

minated, then current Diagnostic Trouble

Codes (DTCs) are present.

2. Read DTC(s) using MIL, Tiny Scan Code

Reader, or Electronic Technician Assistant

(ETA) software.

3. To diagnose system problem(s), proceed to

the applicable Diagnostic Table(s) in Sec-

tion 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 the ETA software.

NOTE: For information on the location or

replacement of speciﬁc components, see

Section 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, see Section 4: Symptoms.

Diagnostic Trouble Codes (DTCs)

The ECM receives voltage signals from as

many as ﬁve 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 op-

erating “window,” a DTC is set and stored in

ECM memory, and the MIL is illuminated.

A default value temporarily replaces the erro-

neous sensor value to restore engine perfor-

mance until the problem is corrected.

Malfunction Indicator Lamp (MIL)

As a bulb and diagnostic system check, the

MIL illuminates at Ignition ON, Engine OFF.

When the engine is started, the MIL is extin-

guished if no current fault condition exists.

If the MIL remains illuminated, it is an indica-

tion 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

existance 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 (with ETA software loaded)

into the 6-pin connector in the EFI wire har-

ness, 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 labeled Non-Scan

Diagnostics must be used, as the data stream

provided by the ECM is not available for analy-

sis. Scan Diagnostics

In the more sophisticated diagnostic mode,

the ETA software can facilitate the diagnosis of

system problems through an expanded inter-

face 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 Diag-

nostic Tables for the most efﬁcient and effec-

tive diagnosis. Those tables that are applicable

to users with access to the ETA software are

labeled as Scan Diagnostics.

4 Section 1: Diagnostic Introduction

Use MIL to Read DTCs

Proceed as follows:

1. Verify that battery voltage is above 12v.

2. Turn Ignition key OFF for ten seconds.

3. Turn Ignition key ON-OFF-ON-OFF-ON

(but do not start the engine).

NOTE: No more than 2.5 seconds can

elapse between each ON and OFF cycle

or the routine is aborted.

4. When performed correctly, the MIL begins

to ﬂash the ﬁrst of four digits.

NOTE: While each DTC actually begins

with the letter “P,” only the numeric charac-

ters are ﬂashed.

5. Also, the ﬁrst digit of every DTC is zero,

which is represented as a series of ten

ﬂashes before the ﬁrst one second pause.

6. Count the number of ﬂashes after the ﬁrst

one second pause to obtain the second

digit of the DTC.

7. Count the number of ﬂashes after the sec-

ond 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.

8. Write down each digit as it is displayed.

9. If there is more than one DTC, the next

DTC begins to ﬂash after a three second

pause.

10.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

Proceed as follows:

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. Obtain Briggs & Stratton Tiny Scan Code

Reader (Part No. 19626).

2. Connect code reader to DLC.

3. Turn Ignition ON, Engine OFF.

NOTE: If the Tiny Scan Code Reader can-

not connect to the ECM, “no-C” is dis-

played, which stands for “no communica-

tion.” If communication is established, the

= P0337 CKP Sensor No Signal

= 61 End Code

= 6

One second pause

Three second pause

= 0

= 3

= 7

First one second pause

Second one second pause

Third one second pause

First digit (always 0)

Second digit

Third digit

Fourth digit

Figure 1-1 MIL Flash Sequence.

Figure 1-2 Data Link Connector (DLC).

Section 1: Diagnostic Introduction 5

Use Electronic Technician Assistant (ETA)

to Read/Clear DTCs

Proceed as follows:

1. Obtain Interface Cable and laptop loaded

with Briggs & Stratton Electronic Technician

Assistant Diagnostic Software (Part No.

19628).

2. Connect Interface Cable between laptop

and DLC.

3. Turn Ignition ON, Engine OFF.

4. To read current DTCs, proceed as follows:

a. Left click the green Online Icon in the

Quick Access Tool Bar at the top of the

screen to connect to the ECM.

b. Select Fault Codes ribbon.

c. Click Current to view current DTCs.

NOTE: Click Historical to view historic

DTCs.

5. To clear DTCs, proceed as follows:

a. Click Fault Codes ribbon.

b. Left click Clear.

c. A pop up window displays the following

message:

“Please Turn off the ECM and wait for this message

to disappear.”

d. Turn Ignition OFF.

e. After at least ﬁve seconds has elapsed,

turn Ignition ON. A pop up window dis-

plays the following message:

“1. Be certain the ignition switch has been turned off

for at least 5 seconds.

2. After 5 seconds, turn the ignition switch on to

power up the ECM.

3. After the ECM is powered up, click the OK but-

ton.”

f. Click OK.

NOTE: Clicking Clear erases both cur-

rent and historic DTCs.

Back Probing 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 connec-

tor housing.

DO NOT force the pin into the connector as

terminal and/or probe pin damage can oc-

cur. Probe travel may be stopped by contact

with insulation or core crimps. Try again after

removing and re-positioning probe pin.

tool displays the number of DTCs read. For

example, “dc-0” means that no DTCs were

found, while “dc-4” means that four DTCs

are recorded.

4. Press the select button to cycle through the

list of DTCs.

5. Once the last DTC is displayed, “CLr?”

appears. Press and hold the select but-

ton until “Hold” changes to “Done,” which

indicates that all DTCs have been “cleared”

from ECM memory.

6. Turn Ignition OFF for a minimum of 20

seconds.

7. Turn Ignition ON, Engine OFF.

8. The tool displays the number of DTCs read.

9. Press the select button to cycle through the

list of DTCs. Write down each DTC as it is

displayed.

6 Section 1: Diagnostic Introduction

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.

Avoiding ECM Damage

 CAUTION: A surge in voltage, current

or both, is called a voltage spike. Voltage

spikes can cause major damage to the ECM.

1. To avoid ECM failure due to accidentally

induced voltage spikes, always observe the

following precautions:

• Do not start engine if battery cable

connections are loose.

• Do not use a battery charger to start engine.

• Turn Ignition OFF before disconnecting and/

or connecting battery cables.

• When disconnecting battery, always

disconnect battery negative (-) cable ﬁrst.

• When connecting battery, always connect

battery positive (+) cable ﬁrst.

• When charging battery, turn Ignition OFF

and remove battery negative cable (black)

from battery negative (-) terminal.

2. Do not spray water at or around ECM.

NOTE: See Figure 1-3. A pin hole centered

under the adhesive label is used in manufac-

turing to determine the integrity of the potted

seal. If the label peels or becomes torn, worn

or abraded, exposure of the hole can allow

water or moisture to intrude, leading to corro-

sion and eventual ECM failure.

Figure 1-3 Protect ECM From Water Intrusion.

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