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Retrieving Codes
ADDITIONAL TESTS FOR EEC-IV SYSTEMS
45 Chapter 4
NOTE:
After the Cylinder Balance Test is done, the KOER
Test Fault Codes will be saved in the Code Reader's
memory together with Cylinder Balance fault codes. To
distinguish between the KOER codes and Cylinder Balance
codes, consult the "Cylinder Balance Test Code Description
Chart" preceeding. Cylinder Balance fault codes are two
digit codes, and are defined by the following numbers: 10,
20, 30, 40, 50, 60, 70, 80 and 90. Cylinder Balance codes
will be displayed after KOER Self-Test codes.
■ If any cylinder codes were received, use "Code
Description" and "Test Results Chart" as a guide and
consult the vehicle's service manual to perform
further testing and/or repairs.
Wiggle Test (EEC-IV Systems)
•
Always observe safety precautions before and during
testing process.
•
ALWAYS check Code Reader battery before retrieving
fault codes.
•
Use this test to check for intermittent faults in some
circuits.
Circuits Tested:
1984 & Newer - Air Charge Temp Sensor (ACT), Barometer
Pressure Sensor (BP), Engine Coolant Temp Sensor (ECT),
Exhaust Gas Oxygen Sensor (EGO), EGR Valve Position
Sensor (EVP), Manifold Absolute Pressure (MAP), Throttle
Position Sensor (TP), Vane Air Temp Sensor (VAT)
1985 & Newer - Vane Air Flow Sensor (VAF)
1986 & Newer - Pressure Feedback EGR Sensor (PFE)
1990 & Newer - Exhaust Gas Oxygen Sensor (EGO), Ignition
Diagnostic Monitor (IDM) (DIS or Dual Plug DIS only), Idle
Tracking Switch (ITS), Mass Air Flow Sensor (MAF)
1. Turn ignition off.
2. Press and release the ON/OFF button to turn the Code
Reader "ON". Press the TEST/HOLD button to place the
Code Reader on “Hold”, then connect the Code Reader to
the vehicle's test connectors.
■ Both the large and small connectors must be
connected.
3. Turn the ignition on. DO NOT START THE ENGINE.
4
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