Briggs & Stratton VANGUARD M490000 Repair Manual page 11

• If electric welding on vehicle, remove battery
negative cable (black) from battery negative
(-) terminal, and disconnect the ECM electrical
connector(s). If welding on the muffler, also
disconnect the O sensor electrical connector and
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remove the O sensor from the muffler.
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2. Do not spray water at or around ECM.
NOTE: See Figure 4. A pin hole centered under the
adhesive label is used in manufacturing 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
corrosion and eventual ECM failure.
Special Tools
The following special tools are required:
1. Briggs & Stratton Spark Tester (Part No. 19368).
2. Briggs & Stratton Digital Volt Ohmmeter Extech
Ma220 (Part No. 19602).
3. Briggs & Stratton Noid Light (Part No. 19623).
4. Briggs & Stratton BIG BLOCK™ Fuel Pressure Test
Adapter (Part No. 19624).
5. Briggs & Stratton Back Probe Wire Set (Part No.
19625).
6. Briggs & Stratton Tiny Scan Code Reader (Part No.
19626).
7. Briggs & Stratton Fuel Pressure Gauge (Part No.
19627).
8. Briggs & Stratton Diagnostic Tool Kit (Part No.
19636).
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