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Robert Bosch LLC MMD 540H Instruction Manual | Version 1 | February 2008
(continued from previous page)
To measure pulse width (mS):
Select the “mS-Pulse”
function with the rotary
switch .
Press the ±TRIG button for
2 seconds until the negative
(-) trigger slope is displayed
on the upper left side of the
display.
NOTE: The applied time for
most fuel injectors is displayed
on the negative (-) slope.
Insert:
Black lead in COM jack.
Red lead in V-Ω-RPM jack.
Connect:
Jumper wires between the
fuel injector and the harness
connector.
Black test probe to a good
ground at the fuel injector or the negative (-) vehicle battery post.
Red test probe to the fuel injector solenoid driver input on the
jumper cable.
Start the engine. A pulse width in milliseconds should be read.
NOTE: Initially, the unit will read “OL”, then readings will descend
and stabilize to the actual pulse width. If “OL” remains, re-check
your connections.
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24 | MMD 540H Hybrid Multimeter | Meter Functions
Black– Red+
Good Ground
Jumper Leads From
Port Fuel Injector
Mixture
Control
Shown