Briggs & Stratton VANGUARD 810 EFI Repair Manual page 67

Section 2: Troubleshooting DTCs
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DTC P0562/P0563 System Voltage Low or High
Circuit Description
The EFI system operates with a battery volt-
age of 9-16 volts. If the system voltage drops
below 6.2 volts the ECM will reset. During
normal operation, the MIL is illuminated if the
voltage is below 9 volts (setting P0562) or
above 16 volts (setting P0563) for a specifi ed
amount of time.
To determine the system voltage to the ECM,
take a voltage measurement at terminal J2-18.
If the voltage is not within 0.01 volt of the mea-
surement obtained at the battery (measuring
between the positive (+) and negative (-) posts
with a DVOM, determine the fault associated
with circuit J2-18.
Similarly, you should be able to measure bat-
tery voltage at terminal J2-15 with Ignition ON,
Engine OFF.
To further diagnose system voltage faults, see
Section 7 of the Briggs & Stratton Intek V-Twin
Cylinder OHV Repair Manual.
20 AMP Fuse
(Yellow)
Ignition Switch
RED
15 AMP Fuse
(Blue)
-
Battery
GND
12V
Main Power Relay
4/C
3/D
RED
RED RED
J2 15 J1 17 J2 18
Main Battery
Ignition
Power
Relay
Check for the following conditions:
1. Poor ECM connection. Inspect harness
connectors for backed out terminals, im-
proper mating, broken locks, improperly
formed or damaged terminals, and poor
terminal to wire connection.
2. Damaged wire harness and/or connectors.
Always clear DTCs after performing repairs.
10/F
9/E
BLACK
J1 09
Ground
ECM
Diagnostic Aids
63