Diagnostic Trouble Code (Dtc) P1107 Manifold Absolute Pressure (Map) Sensor Circuit Intermittent Low Voltage - Isuzu 1999 RODEO Workshop Manual

6E1–304 RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
DIAGNOSTIC TROUBLE CODE (DTC) P1107 MANIFOLD ABSOLUTE
PRESSURE (MAP) SENSOR CIRCUIT INTERMITTENT LOW VOLTAGE
Circuit Description
The manifold absolute pressure (MAP) sensor responds
to changes in intake manifold pressure. The MAP sensor
signal voltage to the powertrain control module (PCM)
varies from below 2 volts at idle (low manifold pressure) to
above 4 volts with the ignition ON, engine not running or at
wide–open throttle (high manifold pressure).
A "speed density" method of determining engine load is
used on the 2.2l engine. This is calculated using inputs
from the MAP sensor, the CKP sensor, and the Intake Air
Temperature (IAT) sensor. The MAP sensor is the main
sensor used in this calculation, and measuring engine
load is its main function.
The MAP sensor is also used to determine manifold
pressure changes while the linear EGR flow test
diagnostic is being run, to determine engine vacuum level
for some other diagnostics and to determine barometric
pressure (BARO). Refer to DTC P0401.
The PCM compares the MAP sensor signal to a
calculated MAP based on throttle position and various
other engine load factors. If the PCM detects a MAP
signal that is intermittently below the calculated value,
DTC P1107 will set. DTC P1107 is a type D code.
Conditions for Setting the DTC
f No TP sensor Diagnostic Trouble Codes are present.
f Engine is running.
f Throttle angle is below 0% if engine speed is less than
1300 RPM.
f Throttle angle is below 5% if engine speed is above
1300 RPM.
f The MAP sensor indicates an intermittent manifold
absolute pressure above 11 kPa for a total of
approximately 5 seconds over a 16–second period of
time.
Action Taken When the DTC Sets
f The PCM will not illuminate the malfunction indicator
lamp (MIL).
f The PCM will store conditions which were present
when the Diagnostic Trouble Code was set as Failure
Records data only. This information will not be stored
as Freeze Frame data.
Conditions for Clearing the DTC
f A history Diagnostic Trouble Code P1107 will clear
after 40 consecutive warm–up cycles have occurred
without a fault.
f Diagnostic Trouble Code P1107 can be cleared by
using the Scan Tool's "Clear Info" function.
Diagnostic Aids
Check for the following conditions:
f Poor connection at PCM – Inspect harness connectors
for backed–out terminals, improper mating, broken
D06RX042