Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 1321

6E1–360

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

DTC P1546  A/C Compressor Clutch Output Circuit Malfunction

  (Cont'd)

Step

No

Yes

Value(s)

Action

8

Replace the A/C Compressor Clutch Relay.

Is the action complete?

—

Verify repair

—

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.

Verify repair.

—

—

—

6E1–361

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

Diagnostic Trouble Code (DTC) P1618 Serial Peripheral Interface (SPI) PCM

Interprocessor Communication Error

Circuit Description

The serial peripheral interface (SPI) communication is
used internally by the PCM to send messages between
the engine processor and the automatic transmission
processor.  Included in each message sent between the
two-processors is a check sum of the message.  Both the
engine processor and automatic transmission processor
will compare this check sum value with the calculated
value.  If the check sums don’t match, the processor will
view the new data as being corrupted and ignore the
values.  The processor will then use the previous
message.  The receiving processor will then send a
message to the sending processor informing it that it’s
last message was corrupted.

Conditions for Setting the DTC

D

Ignition on.

D

Icluded check sum do not equal to a calculated check
sum based on messages in either the engine
processor or the automatic transmission processor.

The above conditions are met for 5 test failures within 20
test samples.

Action Taken When the DTC Sets

D

The PCM will flash the malfunction indicator lamp (MIL)
the first time the fault is detected.

D

The PCM will store conditions 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  “Check Trans” lamp “OFF” on
the third consecutive trip cycle during which the
diagnostic has been run and the fault is no longer
present.

D

A history DTC P1618 will clear after 40 consecutive
warm-up cycles have occurred without a fault.

D

DTC P1618 can be cleared by using the Tech 2 “Clear
Info” function or by disconnecting the PCM battery
feed.

DTC P1618 – Serial Peripheral Interface (SPI) PCM Interprocessor

Communication Error

 

Step

Action

Value(s)

Yes

No

1

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

—

Go to Step 2

Go to 

OBD

System

Check

2

Is the EEPROM calibration the latest version
available?

—

Go to 

Step 4

Go to 

Step 3

3

Reprogram the PCM with the latest available
calibrations.

Does DTC 1618 re-appear when the 

OBD System

Check is repeated?

—

Go to 

Step 4

Repair

completed

4

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

—

6E1–362

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

Diagnostic Trouble Code (DTC) P1625 PCM Unexpected Reset

014RX002

Circuit Description

The powertrain control module (PCM) monitors
unexpected PCM reset. This will not turn on MIL light on,
only records code DTC P1625.

Conditions for Setting the DTC

D

Clock or COP (Computer Operating Properly) reset.

D

Illegal operational code software interupt.

D

Null interupt.

Action Taken When the DTC Sets

D

The PCM will not illuminate the malfunction indicator
lamp (MIL).

D

The PCM will store conditions which were present
when the DTC was set as Failure Records only. This
information will not be stored as Freeze Frame data.

Conditions for Clearing the 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 P1625 will clear after 40 consecutive
warm-up cycles have occurred without a fault.

D

DTC P1625 can be cleared by using the Tech 2 “Clear
Info” function or by disconnecting the PCM battery
feed.

Diagnostic Aids

Check for the following conditions:

D

P1625 alone stored does not need diagnosis. Clear
DTC code.

NOTE: DTC  P1625 is a DTC to record a PCM reset
history. If DTC P1625 is not reset and no engine
abnormality is found after clearance of DTC, it  is not
necessary to do any farther processing.

6E1–363

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

DTC P1625–PCM Unexpected Reset

 

Step

Action

Value(s)

Yes

No

1

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

—

Go to Step 2 

Go to OBD

System

Check 

2

1. Ignition is “On”.
2. Install the Tech 2.
3. Start the engine at let it Idle.
4. On the Tech 2, select “DTC info”.

Does the Tech 2 indicate DTC P1625 failed?

—

Go to Step 3 

Go to

Diagnostic

Aids

3

1. Ignition is “On”.
2. Clear DTC P1625 by using the Tech 2 “Clear Info”.
3. Start the engine at let it Idle.
4. On the Tech 2, select “DTC info”.

Does the Tech 2 indicate DTC P1625 failed?

—

Go to Step 4

Go to

Diagnostic

Aids

4

1. Check for aftermarket electronics, such as

transceiver stereos, and anti theft devices, they
may radiate EMI into the control system if they are
improperly installed. (This  may cause a false
sensor reading and turn on the MIL.)

2. If a problem is found, repair as necessary.

Was the problem found?

—

Verify repair

—