Chrysler PT Cruiser. Manual - part 248

TEST

ACTION

APPLICABILITY

NOTE: Check for contaminants that may have damaged the O2 Sensor:
contaminated fuel, unapproved silicone, oil and coolant.
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, monitor the DRBIII

parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DRBIII

t Freeze Frame information. If possible, try to duplicate the

conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?

All

Yes

→ Repair as necessary

Perform POWERTRAIN VERIFICATION TEST VER - 5 - 1.6L.

→ Test Complete.

DRIVEABILITY - 1.6L GAS

P0133-1/1 O2 SENSOR SLOW RESPONSE —

Continued

Symptom List:

P0134-1/1 O2 SENSOR STAYS AT CENTER
P0140-1/2 O2 SENSOR STAYS AT CENTER

Test Note:

All symptoms listed above are diagnosed using the same tests.

The title for the tests will be P0134-1/1 O2 SENSOR STAYS AT
CENTER.

When Monitored and Set Condition:

P0134-1/1 O2 SENSOR STAYS AT CENTER

When Monitored:

With the engine running for more than 2 minutes, coolant temp at least

80°C (176°F), exhaust temp >400°C (572°F), engine speed <6000 RPM, the engine in
Closed Loop or Decel Fuel Shut Off Active or Fuel Enrichment mode and the O2 Heater
active and no O2 Heater DTCs.

Set Condition:

The 1/1 O2 Sensor Signal circuit voltage is < .45 AND > .372 volt for at

least 7020 msecs. One trip fault.

P0140-1/2 O2 SENSOR STAYS AT CENTER

When Monitored:

With the engine running for more than 2 minutes, coolant temp at least

80°C (176°F), exhaust temp >300°C (572°F), engine speed <6000 RPM, O2 Heater active
and no O2 Heater or MAP Sensor DTCs.

Set Condition:

The 1/2 O2 Sensor Signal circuit voltage is < .45 AND > .37 volt for at least

7 seconds. One trip fault.

POSSIBLE CAUSES

INTERMITTENT CONDITION

O2 SENSOR OPERATION

O2 SENSOR GROUND CIRCUIT OPEN

O2 SENSOR SIGNAL OPEN

O2 SENSOR GROUND CIRCUIT VOLTAGE DROP

O2 SENSOR SIGNAL CIRCUIT VOLTAGE DROP

PCM

TEST

ACTION

APPLICABILITY

NOTE: Check for contaminants that may have damaged the O2 Sensor:
contaminated fuel, unapproved silicone, oil and coolant.
Turn the ignition on.
With the DRBIII

t, read DTCs.

Does the Good Trip Indicator display NO?

All

Yes

→ Go To 2

→ Go To 8

DRIVEABILITY - 1.6L GAS

TEST

ACTION

APPLICABILITY

Turn the ignition off.
Disconnect the O2 Sensor harness connector
Disconnect the PCM harness connector.
Measure the resistance of the O2 Sensor ground circuit from the O2 Sensor harness
connector and the PCM harness connector.
Is the resistance below 5.0 ohms?

All

Yes

→ Go To 3

→ Repair the open O2 Sensor ground circuit.

Perform POWERTRAIN VERIFICATION TEST VER - 5 - 1.6L.

Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Turn the ignition on.
Connect a test light to battery voltage, probe the O2 Sensor Signal circuit in the O2
Sensor harness connector.
With the DRBIII

t, read the O2 Sensor voltage.

Is the voltage above 1.0 volts?

All

Yes

→ Replace the O2 Sensor.

Perform POWERTRAIN VERIFICATION TEST VER - 5 - 1.6L.

→ Go To 4

Turn the ignition off.
Disconnect the O2 Sensor harness connector
Disconnect the PCM harness connector.
Measure the resistance of the O2 Sensor Signal circuit from the O2 Sensor harness
connector and the PCM harness connector.
Is the resistance below 5.0 ohms?

All

Yes

→ Go To 5

→ Repair the open O2 Sensor Signal circuit.

Perform POWERTRAIN VERIFICATION TEST VER - 5 - 1.6L.

NOTE: Ensure the voltmeter leads meet the terminals in the connector and
that there is good terminal to wire connection.
NOTE: Ensure the voltmeter leads are connected for positive polarity
Perform a voltage drop test by backprobe between the O2 Sensor ground circuit at the
O2 Sensor harness connector and PCM harness connector.
Start the engine.
Allow the engine to idle.
Is the voltage below 0.10 volt?

All

Yes

→ Go To 6

→ Repair the high resistance on the O2 Sensor ground circuit.

Perform POWERTRAIN VERIFICATION TEST VER - 5 - 1.6L.

DRIVEABILITY - 1.6L GAS

P0134-1/1 O2 SENSOR STAYS AT CENTER —

Continued

TEST

ACTION

APPLICABILITY

NOTE: Ensure the voltmeter leads meet the terminals in the connector and
that there is good terminal to wire connection.
NOTE: Ensure the voltmeter leads are connected for positive polarity
Perform a voltage drop test backprobe between the O2 Sensor Signal circuit at the O2
Sensor harness connector and PCM harness connector.
Start the engine.
Allow the engine to idle.
Is the voltage below 0.10 volt?

All

Yes

→ Go To 7

→ Repair the high resistance on the O2 Sensor Signal circuit.

Perform POWERTRAIN VERIFICATION TEST VER - 5 - 1.6L.

NOTE: Before Continuing: Disconnect the PCM harness connector and
check the related wiring terminals for corrosion, damage or terminal push
out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay
particular attention to all Power and Ground circuits.
If there are no possible causes remaining, view repair.

All

Repair

Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - 1.6L.

parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DRBIII

t Freeze Frame information. If possible, try to duplicate the

All

Yes

→ Repair as necessary

Perform POWERTRAIN VERIFICATION TEST VER - 5 - 1.6L.

→ Test Complete.

DRIVEABILITY - 1.6L GAS

P0134-1/1 O2 SENSOR STAYS AT CENTER —

Continued

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