Isuzu Rodeo UE. Manual - part 244

6E1–347

RODEO X22SE 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

—

6E1–348

RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

DIAGNOSTIC TROUBLE CODE (DTC) P1627 PCM A/D CONVERSION 

MALFUNCTION

014RX002

Circuit Description

The Powertrain Control Module (PCM) monitors the 5 volt
reference signal when the Ignition is ON. If the PCM
senses an Analog to Digital (A/D) conversion error within
the PCM, then DTC P1627 will set. DTC P1627 is a type A
code.

Conditions for Setting the DTC

f

Engine is running.

f

Any A/D DTC’s set.

Action Taken When the DTC Sets

f

The PCM will illuminate the Malfunction Indicator Lamp
(MIL) the first time the fault is detected.

f

The PCM will store the conditions that were present
when the DTC was set as Freeze Frame and in Failure
Records.

Conditions for Clearing the MIL/DTC

f

The PCM will turn OFF the MIL on the third consecutive
trip without a reported failure.

f

A History DTC will clear after 40 consecutive trips
without a reported failure.

f

The DTC can be cleared using the Scan Tool’s ”Clear
Info” function.

Diagnostic Aids

f

Poor connections, or a damaged harness – Inspect the
harness connectors for: backed–out terminals,
improper mating or damaged terminals. Also, check for
open circuits, shorts to ground, and shorts to voltage.

6E1–349

RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

DTC P1627  PCM A/D Conversion Malfunction

 

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 ON, Engine OFF.
2. Review and record Tech 2 Failure Records data,

then clear the DTCs.

3. Operate the vehicle within the Failure Records

conditions as noted.

4. Using the Tech 2, monitor ”DTC” info for DTC

P1627.

Does the Tech 2 indicate DTC P1627 ”Ran and
Passed?”

—

Refer to

Diagnostic

Aids 

Go to Step 3 

3

Check the suspect 5 volt reference circuit(s) for the
following conditions:

f

A short to ground

f

An open circuit

f

A short to voltage

Was the problem found?

—

Verify repair

Go to Step 4 

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.

Verify repair.

—

—

—

6E1–350

RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

DIAGNOSTIC TROUBLE CODE (DTC) P1635 5 VOLT REFERENCE VOLTAGE

CIRCUIT MALFUNCTION

D06RX062

Circuit Description

The Powertrain Control Module (PCM) monitors the 5 volt
reference signal when the Ignition is ON. If the PCM
senses the 5 volt reference signal circuit is above 5.12
volts or below 4.88 volts, then DTC P1635 will set. DTC
P1635 is a type A code.

Conditions for Setting the DTC

f

Ignition voltage is greater than 6.3 volts.

f

Engine is running.

The above mentioned conditions are met and  one of the
following two conditions are met for 5 seconds within a 10
second test sample:

f

PCM senses the 5 volt reference signal circuit is above
5.12 volts.

OR

f

PCM senses the 5 volt reference signal circuit is below
4.88 volts.

Action Taken When the DTC Sets

f

The PCM will illuminate the Malfunction Indicator Lamp
(MIL) the first time the fault is detected.

f

The PCM will store the conditions that were present
when the DTC was set as Freeze Frame and in Failure
Records.

Conditions for Clearing the MIL/DTC

f

The PCM will turn OFF the MIL on the third consecutive
trip without a reported failure.

f

A History DTC will clear after 40 consecutive trips
without a reported failure.

f

The DTC can be cleared using the Scan Tool’s ”Clear
Info” function.

Diagnostic Aids

Poor connections, or a damaged harness – Inspect the
harness connectors for: backed–out terminals, improper
mating or damaged terminals. Also, check for open
circuits, shorts to ground, and shorts to voltage.