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Retrieving Codes
FAULT CODE DEFINITIONS FOR EEC-IV SYSTEMS (11 - 15)
Chapter 4 46
■ For 1986 and older vehicles: Wiggle test is now
active. Proceed to step 4.
■ For 1987 and newer vehicles: Set Code Reader
switch to TEST, then HOLD, then TEST. Wiggle test
is now active. Proceed to Step 4.
4. Perform "Wiggle Test" on circuit.
■ Wiggle sensor, connector and wiring that needs to be
tested; a code will display if a fault is detected.
NOTE:
On some models, service codes are lost when
the ignition is turned off.
5. Turn off ignition and disconnect Code Reader from test
connectors.
■ Consult service manual and service any fault codes
retrieved during Wiggle Test.
FAULT CODE DEFINITIONS FOR EEC-IV SYSTEMS CAR &
TRUCK
IMPORTANT:
Retrieving and utilizing Diagnostic Trouble
Codes (DTC's) for troubleshooting vehicle operation problems is
only one part of an overall diagnostic strategy. Never replace
a part based only on the Diagnostic Trouble Code Definition.
Always consult the vehicle's service manual for more detailed
testing instructions. Each DTC has a set of testing procedures,
instructions and flow charts that must be followed to confirm
the exact location of the problem. This type of information is
found in the vehicle's service manual.
Test Condition Key:
O = Key Off Engine Off (KOEO) code
R = Key ON Engine Running (KOER) code
C = Continuous Memory (CM) code
4
TEST
CODE CONDITION FAULT CODE DEFINITION
11 O, R, C System OK
12 R RPM at idle out of range/high
13 R RPM at idle out of range/low
14 C Ignition profile pickup (PIP) circuit failure
14 C Engine RPM sensor circuit fault (Diesel)
15 O EEC (PCM) Read Only Memory (ROM) test
failed
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