Equus 3123 - GM Code Reader (1982 - 1995) - Manual (Page 3)

You Can Do It!
GM ii
Plug It In
• Test connector usually found
under the left side of the
dashboard.
• Set Selector switch to ECM A-B
position.
• Make sure ignition is off. Plug
Code Reader into test connector.
Read Fault Codes
• Turn on ignition. DO NOT
START ENGINE.
• Read codes from flashing
"Check Engine" or "Service
Engine Soon" light.
Pinpoint Problems
• Locate fault code(s) in the
appropriate Service Codes List.
1
CHECK ENGINE CHECK ENGINE
SERVICE SERVICE
ENGINE ENGINE
SOON SOON
2
3
triev
CODE DEFINITION
haft or Crankshaft sensor - cir
el Injector circuit is not working p
possible blown fuel injector fuse
Ignition system fault - Intermittent 7X sign
loss of 58X signal or 6X signal (Saturn)
1
Throttle position sensor (TPS) - signal voltag
high during engine idle or deceleration
22
Throttle position sensor (TPS) - signal
low during engine idle
Fuel cutoff relay circuit - open
ground
23
Manifold air temperature (M
voltage is low or high
Throttle position senso
Mixture Control (M
circuit problems
Intake Air T
Vehicle sp
problem
Ma
Read manual for a complete description of the Code Reader and
it's proper use and operation.