B2300 SE Regular Cab 2WD L4-2.3L VIN A (1997)
Engine Control Module: Description and Operation
Powertrain Control Module
COMPONENT
Powertrain Control Module (PCM)
FUNCTION
PCM receives input from sensors and other electronic components. Based on data received and programmed into memory, PCM generates output
signals to control various relays, solenoids and actuators.
REMARKS
PCM has a 104-pin electrical connector.
Hardware Limited Operation Strategy
HLOS - HARDWARE LIMITED OPERATION STRATEGY
HLOS is a PCM function. HLOS provides minimal engine operation should the PCM stop functioning correctly. All modes of self-test are not
functional and electronic hardware is in control of system.
HLOS allowable output functions:
-
Spark output controlled directly by PIP signal.
-
Fixed fuel pulse width synchronized with PIP signal.
-
Fuel pump energized.
-
Idle speed control output signal functional.
HLOS disabled outputs to default state:
-
EGR solenoids
-
No converter lock-up.
Ignition Diagnostic Monitor Signal
IGNITION DIAGNOSTIC MONITOR (IDM) SIGNAL
IDM signal communicates information by pulse width modulation. IDM circuit is enclosed in PCM.
Keep Alive Memory
KEEP ALIVE MEMORY (KAM)
PCM stores data in KAM about vehicle operating conditions, and then uses data to compensate for component variability. KAM remains powered
when ignition is off so that information is not lost until PCM connector disconnected or battery cable disconnected.
Output Test Mode
OUTPUT TEST MODE (OTM)
OTM aids in servicing output actuators associated with PCM. It energizes and de-energizes most of system output actuators on command.
Parameter Identification
PARAMETER IDENTIFICATION (PID)
PID is certain data values, analog and digital inputs and outputs, calculated value, and system status information. PID can be accessed from scan tool
or NGS tester.
Profile Ignition Pickup
COMPONENT
Profile Ignition Pickup (PIP) signal
FUNCTION
PCM generates an internal PIP signal from crankshaft position sensor signal. PIP signal is used to calculate SPOUT signal and to supply a clean,
inverted signal for tachometer operation.
REMARKS
PIP signal circuit is enclosed in PCM.
Spark Output Signal
COMPONENT
Spark Output Signal (SPOUT)
