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Opel Frontera UE. Manual - part 837

6E1–231

X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

DTC P1627 PCM A/D Conversion Malfunction

Step

Action

Value(s)

Yes

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

—

Go to Step 2

Go to OBD

System

Check

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

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

A short to ground

An open circuit

A short to voltage

Was the problem found?

—

Verify repair

Go to Step 4

Replace the ECM.

—

6E1–232

X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

DIAGNOSTIC TROUBLE CODE (DTC) P1635 5 VOLT REFERENCE VOLTAGE

CIRCUIT MALFUNCTION

014RX002

Circuit Description

The Engine Control Module (ECM) monitors the 5 volt
reference signal when the Ignition is ON. If the ECM
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

Ignition voltage is greater than 6.3 volts.

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:

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

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

Action Taken When the DTC Sets

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

The ECM 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

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

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

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.

6E1–233

X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

DTC P1635 5 Volt Reference Voltage Circuit Malfunction

Step

Action

Value(s)

Yes

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

—

Go to Step 2

Go to OBD

System

Check

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

P1635.

Does the Tech 2 indicate DTC P1635 ”Ran and
Passed?”

—

Refer to

Diagnostic

Aids

Go to Step 3

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

A short to ground

An open circuit

A short to voltage

Was the problem found?

—

Verify repair

Go to Step 4

Replace the ECM.

—

6E1–234

X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

DIAGNOSTIC TROUBLE CODE (DTC) P1640 ODM OUTPUT CIRCUIT FAULT

014RX002

Circuit Description

Output driver modules (ODMs) are used by the engine
control module(ECM) to turn ON many of the current
driven devices that are needed to control various engine
and transmission functions. Each ODM is capable of
controlling up to 11 separate outputs by applying ground
to the device which the ECM is commanding ON.
ODMs have the capability of diagnosing each output
circuit individually. DTC P1640 set indicates an improper
voltage level has been detected on an ODM output.
If the ECM detects an open circuit condition and a shorted
to voltage circuit condition on the same circuit at the same
time, then DTC P1640 will set. DTC P1640 is a type D
code.

Conditions for Setting the DTC

Ignition ON.

Above conditions occur for at least 2.5 seconds.

The ECM detects an open circuit condition and a
shorted to voltage circuit condition on the same circuit
at the same time.

Action Taken When the DTC Sets

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

The ECM 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

A history DTC P1640 will clear after 40 consecutive
warm up cycles occur without a fault.

DTC P1640 can be cleared by using the Scan Tool’s
”Clear Info” function.

Diagnostic Aids

Check for the following conditions:

Poor connection at ECM – Inspect harness connectors
for backed–out terminals, improper mating, broken
locks, improperly formed or damaged terminals, and
poor terminal to wire connection.

Damaged harness Inspect the wiring harness for
damage. If the harness appears to be OK, disconnect
the ECM, turn the ignition ON and observe a voltmeter
connected to the MIL driver circuit at the ECM harness
connector while moving connectors and wiring
harnesses relates to the MIL. A change in voltage will
indicate the location of the fault.

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.

The following ECM pins are controlled by
output driver modules (ODMs):

A13 MIL LAMP

A14 Rear Defogger

B14 A/C Clutch

B16 EVAP Canister Parge Solenoid

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