Diagnostic Trouble Code (Dtc) P1381 Abs Rough Road Class 2 Serial Link Error - Isuzu 1999 RODEO Workshop Manual

6E2–398
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P1381 ABS Rough Road Class 2 Serial Link
Circuit Description
The powertrain control module (PCM) monitors no ABS
signal. When PCM does not receive ABS signal, PCM will
set DTC P1381.
Conditions for Setting the DTC
f PCM does not receive ABS signals from ABS ECU.
f Vehicle speed is more than 0 mph.
f Load is less than 99%.
f Engine revolution is less than 6250rpm.
f 2.5 second after key on.
f Misfire DTCs exist.
f 100 test failures within 120 test samples.
Action Taken When the DTC Sets
f The PCM will store DTC 1381 only, MIL on.
DTC P1381 – ABS Rough Road Class 2 Serial Link Error
Step
1 Was the "On-Board Diagnostic (OBD) System Check"
performed?
2 1. Ignition "ON," engine "OFF", review and record
Tech 2 Failure Records Data.
2. Operate the vehicle within Failure Records
conditions as noted.
3. Using a Tech 2, monitor "DTC inf. for DTC P1381
and Misfire DTCs until the DTC P1381 and Misfire
DTCs test runs. Note the result.
Does the Tech 2 indicates DTC P1381 and Misfire
DTCs failed this ignition?
3 Check open circuit among communication line of
PCM/ABS and others.
Does short circuit exist?
4 Replace the PCM.
IMPORTANT: The
programmed.
Powertrain Control
procedures.
And also refer to latest service bulletin
Check to see if the Latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement PCM.
Is the action complete?
Action
replacement PCM
Refer to On-Vehicle Service in
Module and Sensors
Error
Conditions for Clearing the MIL/DTC
f A history code DTC P1381 will clear after 40
consecutive warm-up cycles have occurred without a
fault.
f DTC P1381 can be cleared by Tech-II or by
disconnecting the PCM battery feed.
Diagnostic Aids
Check for the following conditions:
f Inspect open circuit of communication wire between
ABS ECU and PCM.
f Follow ABS ECU diagnosis procedure.
Reviewing the Failure Records vehicle mileage since the
diagnostic test last failed may help determine how often
the condition that caused the DTC to be set occurs. This
may assist in diagnosing the condition.
Value(s)
—
—
—
must be
for
—
Yes No
Go to OBD
System
Go to Step 2 Check
Refer to ABS
diagnosis
After inspecting
ABS, repeat
Step 2
If problem still
Clear DTC by
exists, go to
Step 3
Tech 2
Repair wiring
Go to Step 4
Verify repair
Verify repair —