Secondary Ignition System Display Diagnosis; Evaluation Of Secondary Display - Mazda B-Series 1997 Workshop Manual

ELECTRONIC IGNITION SYSTEM
FIRING
EVENNESS VOLTAGE AVERAGE
(HIGH TO LOW)
I
VOLTAGE
I
I
SECONDARY IGNITION SYSTEM DISPLAY
DIAGNOSIS
Procedure
1. Connect an engine analyzer to view parade display of
secondary ignition system.
2. Start the engine and slowly increase engine speed from
idle to 1,300 rpm.
3. Compare the engine analyzer display to the following
display illustrations in the Evaluation of Secondary
Display.
Note
The illustrations shown are for the 2.3L four cylin-
der model, but are typical for the 3.OL and 4.OL
engines.
4BUOGX-035
Evaluation of Secondary Display
Note
The 2.3L, 3.OL, and 4.OL B-Truck have th capability
of operating in a multi-strike mode (the spark plugs
are fired four (4) strikes per firing). The operating
modes are limited to about 1500 rpm. Although the
PCM provides these operating modes, the PCM
must also request them in order for the operating
modes to be activated. Result #1 through Result #5
display multi-strike operating modes.
Result 1
The average value of spark plug firing voltage is 20 kV or
less with evenness of spark plug firing voltage 8 kV or
less.
If
the result is as indicated, the ignition system is OK.
Result 2
The average value of spark plug firing voltage is greater
than 20 kV with evenness of spark plug firing voltage
8 kV or less.
If the result is as indicated, check the following:
High tension leads for proper installation in coil
Resistance of high-tension lead
Spark plug gap (Refer to page G-43.)