Diagnostic Trouble Code (Dtc) P1380 Abs Rough Road System Fault - Isuzu 1999 RODEO Workshop Manual

6E1–332 RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
DIAGNOSTIC TROUBLE CODE (DTC) P1380 ABS ROUGH ROAD SYSTEM
Circuit Description
The PCM identifies an engine misfire by detecting the
variations in crankshaft speed. The crankshaft speed
variations can also occur when a vehicle is operated over
a rough surface. The ABS (Anti–Lock Brake System) can
detect when the vehicle is on a rough surface based on
the wheel acceleration/deceleration data supplied by
each wheel speed sensor. The EBCM (Electronic Brake
Control Module) over the Class 2 serial data line sends
this information to the PCM. The OCM then uses this
information in order to determine if the crankshaft
variations are being caused by an actual engine misfire or
from being driven on a rough surface.
This Diagnostic determines if the ABS system is not
capable of detecting a rough road situation. DTC P1380
is a type D code.
Conditions for Setting the DTC
f 20 unusable ABS data values within a 50 value sample.
Conditions for Clearing the DTC
f A history DTC clears after 40 consecutive warm–up
cycles without a fault.
f The Tech 2 can clear the DTC.
Diagnostic Aids
The setting of this DTC indicates that a misfire was
detected and that the PCM could not determine if the
FAULT
detected misfire was true or due to operating the vehicle
on a rough surface. A misfire can be a true misfire with or
without setting this DTC. Check the EBCM for poor
connections at the Class 2 serial data terminals. Be sure
no true misfire exists after repairing the cause of this DTC.
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart:
1. The Powertrain OBD System Check prompts the
technician to complete some basic checks and store
the freeze frame and failure records data on the
Tech 2 is applicable. This creates an electronic copy
of the data taken when the malfunction occurred.
The information is then stored on the Tech 2 for
later reference.
2. ABS DTCs are found by selecting Chassis on the
Tech 2.
3. Be careful to clear only DTCs and not the captured
information stored on the Tech 2. The Tech 2 will
issue a warning if this is about to happen.
4. A DTC P1380 being reset indicated that the PCM is
not receiving the correct information from the EBCM
due to an ABS DTC.
5. When DTC P1380 is set, and ABS DTC should also
be set.
6. Refer to Section 5E of the service manual for ABS
DTCs and repairs.
014RX002