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1) Mark the initial setting of
the Diagnostic Mode
Selector on the
computer housing.
IMPORTANT: The
Diagnostic Mode
Selector is a potentiom-
eter. It is critical that the
initial position (setting)
of this potentiometer be marked on the
computer housing so that when testing is
complete, it can be reset to its original
position!
2) Using the Selector
Tool or other means,
turn the Diagnosis
Mode Selector to the
fully COUNTER-
CLOCKWISE position.
3) Turn the
ignition
switch ON,
but do not
start the
engine.
4) Check to see that
both the RED and
GREEN LED's turn
ON and stay ON.
• If they do, proceed to the next step.
• If they do not, you have a problem
with the battery supply circuit which
feeds the computer (ECU), or the
ECU itself is defective. This failure
must be repaired before proceeding.
Refer to the vehicle service manual.
Some publications have this
information in books or sections
called "Computerized Engine
Controls", "Electronic Engine
Controls", or "Tune-Up Information."
62
5) Turn the Diagnosis
Mode Selector fully
CLOCKWISE.
6) Have your pencil and paper ready.
7) (For Maxima
and 300ZX only.
If 300ZX Turbo,
go to Step 13.)
Depress and
release
accelerator
pedal.
8) Start the vehicle's engine.
9) Apply the brakes, and move the
gear shift lever to Drive.
10)Turn the headlamp switch, or the
rear defogger switch ON and then
back to OFF.
11)Observe the RED and GREEN
LED's.
• Code 44 should be displayed.
• Note any codes other than 44.
12)This completes trouble code
retrieval for Maxima and 300ZX.
• Turn the Diagnosis
Mode Selector fully
COUNTERCLOCK-
WISE, then the
ignition switch to the
OFF position.
• IMPORTANT: Turn
the Diagnosis Mode
Selector to its initial
position (setting) as
marked in Step 1 of
the test procedure.
• Proceed to the "What to do with the
Trouble Codes" section below. (Skip
steps 13 through 18.)
ORIGINAL
PENCIL MARK
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