P1311 Ion Sensing Module Sec Line 1 Circuit Fault - Isuzu 2000 Trooper Workshop Manual

6E–452
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

P1311 ION Sensing Module SEC line 1 Circuit Fault

Circuit Description
D The Power Control Module (PCM) will compara the
secondary current reading to a predetermined
maximum and minimum thresholds.
If the secondary current signal pulse width is out
of the predetermined renge, the fail counter will be
incremented. If the failure counter exceeds the
calibration, then the PCM is complete and a failure
will be reported. If the sample counter threshold is
reached before the failure threshold, then the
PCM is complete and pass will be reported.
This PCM will detect an open/short circuit in the
secondary current sense input circuit, misfire on
the entire bank for the secondary current sense
input circuit, coil failure, and same internal Ignition
Current Sense System (ICSS) module faults.
Conditions for setting the DTC
D Ignition voltage is between 10volt and 16 volts.
D MAP sensor signal is between 26kPa and 100 kPa.
D Fuel level is more than 10%.
D Engine speed is between 650rpm and 6500rpm.
D ION Sensing Module circuit is open or shorted signals
on the SEC 1 line.
Diagnostic Trouble Code (DTC)
Action Taken When the DTC Sets
D The PCM will illuminate the malfunction indicator lamp
(MIL) the first time the fault is detected.
D The PCM calculates an air flow value based on idle air
control valve position, throttle position, RPM and
barometric pressure.
D The PCM will store condition which were present when
the DTC was set as Freeze Frame and in the Failure
Records data.
Conditions for Clearing the MIL/DTC
D The PCM will turn the MIL "OFF" on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condition is no longer present.
D A history DTC P1311 will clear after 40 cosecutive trip
cycle during which the warm up cycles have occurred
without a fault.
D DTC P1311 can be cleared using the Tech 2 "Clear
Info" function or by disconnecting the PCM battery
feed.
Diagnostic Aids
An intermittent may be caused by the following:
D Poor connections.
D Mis routed harness.
D Rubbed through wire insulation.
D Broken wire inside the insulation.
Check for the following conditions:
D06RY00067