VACUUM ASSIST
The PCM cannot detect leaks or restrictions in the
vacuum circuits of vacuum assisted engine control
system devices. However, these could cause the PCM
to store a MAP sensor diagnostic trouble code and
cause a high idle condition.
PCM SYSTEM GROUND
The PCM cannot determine a poor system ground.
However, one or more diagnostic trouble codes may
be generated as a result of this condition. The mod-
ule should be mounted to the body at all times, also
during diagnostic.
PCM CONNECTOR ENGAGEMENT
The PCM may not be able to determine spread or
damaged connector pins. However, it might store
diagnostic trouble codes as a result of spread connec-
tor pins.
HIGH AND LOW LIMITS
OPERATION
The PCM compares input signal voltages from each
input device with established high and low limits for
the device. If the input voltage is not within limits
and other criteria are met, the PCM stores a diagnos-
tic trouble code in memory. Other diagnostic trouble
code criteria might include engine RPM limits or
input voltages from other sensors or switches that
must be present before verifying a diagnostic trouble
code condition.
SPECIFICATIONS
LOAD VALUE
ENGINE
IDLE/NEUTRAL
2500 RPM/NEUTRAL
2.4 Auto. Trans.
4.4% of Maximun Load
11.7% of Maximun Load
3.0L
4.2% of Maximun Load
11.5% of Maximun Load
3.3L
5% of Maximun Load
13.4% of Maximun Load
3.8L
4.7% of Maximun Load
13.3% of Maximun Load
NS
EMISSION CONTROL SYSTEMS
25 - 21
DESCRIPTION AND OPERATION (Continued)
