Bosch 540H User Manual download pdf (Page 25)

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.

24 | MMD 540H Hybrid Multimeter | Meter Functions

Black– Red+

Good Ground

Jumper Leads From

Port Fuel Injector

Mixture

Control

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Bosch 540H User Manual Page 25