EDI DIAGNOSIS SERVICE MANUAL NUMBER 22
Page 5E-8 90-860074--1 FEBRUARY 2002
Abbreviations (continued)
KV Kilovolts
LDF Boost Pressure Sensor (See MAP)
LGS Low Idle Switch
MAP
Manifold Absolute
Pressure
MIL Malfunction Indicator Lamp
msec Millisecond
NBF Instrumented Injector
N/C Normally Closed
N/O Normally Open
PID Packet of Informational Data
PROM Programmable Read Only Memory
PWG Throttle Position Sensor
RAM Random Access Memory
REF HI Reference High
REF LO Reference Low
ROM Read Only Memory
SRC Signal Range Check
SW Switch
TACH Tachometer
TERM Terminal
TP Throttle Position Sensor
V Volts
VAC Vacuum
WOT Wide Open Throttle
ECM Self-Diagnosis
The ECM performs a continual self-diagnosis on certain control functions. This diagnostic
capability is complemented by the diagnostic procedures contained in this manual. The
ECM’s language for communicating the source of a malfunction is a system of diagnostic
codes. The codes are four digit numbers preceded by the letter “P. ” The prefix letter “P” is
the abbreviation for “Powertrain,” an internationally standard reference. When a
malfunction is detected by the ECM, a code is set and the Malfunction Indicator Lamp (MIL)
is illuminated.
NOTE: On factory instrumentation the MIL is a lamp with a check mark (n) on the colored
lens.
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