Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 1318

6E1–348

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

8. Repair any condition that remains and is causing a

misfire by following the table for any DTC that has
set.

9. Replacement PCMs must be reprogrammed. Refer

to the latest Isuzu Technical Communication System
information for programming procedures.

DTC P1380 ABS Rough Road System Fault

 

Step

Action

Value(s)

Yes

No

1

Was the ”On–Board Diagnostic (OBD) System Check”
performed?

—

Go to Step 2 

Go to

Powertrain

OBD System

Check 

2

1. Turn the ignition switch ON, with the engine OFF.
2. Install the Tech 2.
3. Check for any ABS DTCs.

Were any ABS DTCs set?

—

Go to Step 6 

Go to Step 3 

3

1. Turn the ignition switch ON, with the engine OFF.
2. Review the Freeze Frame data and note the

parameters.

Did a misfire DTC set?

—

Go to Step 4 

Go to Step 10

4

Was a DTC P1380 also set?

—

Go to Step 5 

Go to Step 8 

5

Did a ABS DTC also set?

—

Go to Step 6 

Go to Step 9 

6

Repair the condition causing the ABS DTC.

Is the action complete?

—

Go to Step 7 

—

7

Check if any additional DTCs are set.

Are any DTCs displayed that has not been diagnosed?

—

Go to

applicable
DTC table

System OK

8

Repair the condition causing the misfire.

Is the action complete?

—

Go to Step 10

—

9

Replace the PCM.

IMPORTANT: The replacement PCM must be
programmed.Refer to On–Vehicle Service in
Powertrain Control Module and Sensors for
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?

—

Go to Step 10

—

10

1. Using the Tech 2, clear the DTCs.
2. Start the engine and idle at normal operating

temperature.

3. Operate the vehicle within the conditions for setting

this DTC as specified in the supporting text.

Does the Tech 2 indicate that this diagnostic has ”Ran
and Passed?”

—

Verify repair

—

6E1–349

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

DIAGNOSTIC TROUBLE CODE (DTC) 

P1381 ABS ROUGH ROAD CLASS 2 SERIAL DATA FAULT

014RX002

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 PCM 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. DTC P1381 is a
type D code.

Conditions for Setting the DTC

D

No serial data for 15 second after previous data
received.

Action Taken When the DTC Sets

D

The PCM records the operating conditions at the time
the diagnostic fails. The Failure Records buffers stores
this information.

D

A history DTC is stored.

D

The PCM will not illuminate the Malfunction Indicator
Lamp (MIL).

Conditions for Clearing the DTC

D

A history DTC clears after 40 consecutive warm up
cycles without a fault.

D

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
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 indicates that a

misfire was detected and that the PCM could not
determine if the 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 poop connections at the
Class 2 serial data terminals.  Be sure no true
misfire exists after repairing the cause of this DTC.

6E1–350

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

3. Refer to the ABS portion of the service manual for

ABS DTCs and repairs. Performing the ABS
Diagnostic System Check is the first step in
diagnosing a serial data problem.

4. 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.

5. A DTC P1381 being reset indicates that the PCM is

not receiving serial data from the EBCM due to a
EBCM problem.

6. When DTC P1381 is set, ABS serial data should not

be able to be displayed.

7. Repair any condition that is causing a misfire by

following the table for any DTC that has set.

10. Replacement PCMs must be reprogrammed. Refer

to On–Vehicle Service in Powertrain Control Module
and Sensors for procedures. 

6E1–351

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

DTC P1381 ABS Rough Road Class 2 Serial Data Fault

 

Step

Action

Value(s)

Yes

No

1

Was the ”On–Board Diagnostic (OBD) System Check”
performed?

—

Go to Step 2 

Go to

Powertrain

OBD System

Check

2

1. Turn the ignition switch ON, with the engine OFF.
2. Install the Tech 2.
3. Attempt to display the ABS data on the Tech 2.

Can the ABS be displayed?

—

Go to Step 4 

Go to Step 3 

3

Repair the condition causing the ABS data not to be
displayed.

Is the action complete?

—

Go to Step 4 

Go to Step 10

4

1. Clear the DTCs.
2. Operate the vehicle within the same conditions as

indicated within the Freeze Frame data and
Conditions for Setting the DTC as noted while
driving on rough surfaces.

Did a misfire DTC set?

—

Go to Step 5 

Go to Step 8 

5

Was a DTC P1380 also set?

—

Go to Step 6 

Go to Step 7 

6

Can the ABS data be displayed?

—

Go to Step 10

Go to Step 4 

7

Repair the condition causing the misfire.

Is the action complete?

—

Go to Step 8 

—

8

1. Using the Tech 2, clear the DTCs.
2. Start the engine and idle at normal operating

temperature.

3. Operate the vehicle within the conditions for setting

this DTC as specified in the supporting text.

Does the Tech 2 indicate that this diagnostic has ”Ran
and Passed?”

—

Go to Step 9 

Go to Step 2 

9

Check if any additional DTCs are set.

Are any DTCs displayed that have not been
diagnosed?

—

Go to

applicable
DTC table

System OK

10

Replace the PCM.

IMPORTANT: The replacement PCM must be
programmed. Refer to On–Vehicle Service in
Powertrain Control Module and Sensors for
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?

—

Verify repair

—