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1) Using the Selector
Tool or other
means, verify that
the Diagnosis Mode
Selector is in the
OFF position.
2) Turn the
ignition
switch ON, but
do not start
the engine.
3) 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 may be 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."
4) Turn the Diagnosis
Mode Selector to
the ON position.
5) Have your pencil and paper ready.
6) Observe the RED and GREEN
LED's.
• Manual Transmission vehicles:
codes 23, 24, 31, and 32 should be
displayed.
• Note any codes other than 23, 24,
31, and 32.
54
• Automatic Transmission vehicles:
codes 31, and 32 should be
displayed.
• Note any codes other than 31, and
32.
7) Depress and
release
accelerator
pedal.
8) Observe the RED and GREEN
LED's.
• Codes 24, 31, and 32 should be
displayed.
• Note any codes other than 24, 31,
and 32.
9) Move the
gear shift
lever from
Neutral to the highest gear and
then back to Neutral.
10)Observe the RED and GREEN
LED's.
• Codes 31, and 32 should be
displayed.
• Note any codes other than 31, and
32.
11)Start the vehicle's engine.
12)Observe the RED and GREEN
LED's.
• Code 31 should be displayed.
• Note any codes other than 31.
13)Turn the A/C switch
from OFF to ON to
OFF (if equipped).
14)Observe the RED
and GREEN LED's.
• Code 44 should be displayed.
• Note any codes other than 44.
A/C
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