Actron Code Scanner CP9025, Руководство пользователя

Страница: 70 / 88

70
NISSAN
1990 Stanza, 300ZX
1991 NX, Sentra, Stanza, 240SX, 300ZX
1992 Maxima w/VE30DE (DIS) engine, NX,
Sentra, Stanza, 240SX, 300ZX
Preliminary Checks
Nissan service manuals list several
checks which should be made before
reading trouble codes. Problems in the
areas listed below can cause the
computer to set false or misleading
codes. Ignoring these checks can make
you miss the real cause of a code! This
can lead to the unnecessary replace-
ment of good parts. Service manual
procedures for troubleshooting a code
assume all preliminary checks are good.
These checks vary with vehicle. Typical
checks are listed below. Refer to service
manual for your vehicle requirements.
• Visually inspect electrical wiring and
connectors.
• Visually inspect vacuum hoses and
connectors.
• Perform a compression test.
• Perform an exhaust system
backpressure test.
• Perform a fuel pressure test.
• Check curb idle speed.
• Check ignition timing.
• Check computer control of air/fuel
mixture.
• Check the idle speed switch.
Reading Trouble Codes:
All listed vehicles
1) Mark the initial
setting of the
Diagnostic Mode
Selector on the
computer housing.
IMPORTANT: The Diagnostic Mode
Selector is a potentiometer. 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) Turn the ignition
switch ON, but do
not start the
engine.
3) Turn the Diagnosis
Mode Selector fully
CLOCKWISE. Wait 3
seconds.
4) Turn the Diagnosis
Mode Selector fully
COUNTERCLOCK-
WISE. The RED LED
will begin to flash. The
computer is now in
Mode 2 (Trouble Codes).
5) Have your pencil and paper ready.
6) Write down all displayed Trouble
Codes.
O
FF
ON