Chrysler PT Cruiser. Manual - part 237

TEST

ACTION

APPLICABILITY

NOTE: Allow the O2 Sensor voltage to stabilize between 0.4 and 0.6 volts
before continuing the test.
Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Measure the resistance across the O2 Sensor Heater element at the component side
of the connector.
NOTE: Heater Resistance Specification for 1/1 and 1/2 O2 Sensor is from 3 to
20 ohms.
Is the O2 Sensor Heater element within specification?

All

Yes

→ Go To 4

→ Replace the O2 Sensor.

Perform POWERTRAIN VERIFICATION TEST VER - 5 - 1.6L.

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

All

Yes

→ Go To 5

→ Repair the O2 Sensor Heater Control circuit for an open.

Perform POWERTRAIN VERIFICATION TEST VER - 5 - 1.6L.

Turn the ignition off.
Disconnect the O2 Sensor harness connector.
With the DRBIII

t, actuate the O2 Heater Relay.

Measure the voltage of the ASD Relay Output circuit in the O2 Sensor harness
connector.
Is the voltage above 11.0 volts?

All

Yes

→ Go To 6

→ Repair the ASD Relay Output circuit for an open.

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.

DRIVEABILITY - 1.6L GAS

P0030-1/1 O2 SENSOR HEATER CIRCUIT OPEN —

Continued

TEST

ACTION

APPLICABILITY

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 DRB
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

P0030-1/1 O2 SENSOR HEATER CIRCUIT OPEN —

Continued

Symptom List:

P0031-1/1 O2 SENSOR HEATER CIRCUIT LOW
P0037-1/2 O2 SENSOR HEATER CIRCUIT LOW

Test Note:

All symptoms listed above are diagnosed using the same tests.

The title for the tests will be P0031-1/1 O2 SENSOR HEATER
CIRCUIT LOW.

When Monitored and Set Condition:

P0031-1/1 O2 SENSOR HEATER CIRCUIT LOW

When Monitored:

With the engine running and O2 Sensor operation >0.

Set Condition:

When the PCM detects a short to ground on the 1/1 O2 Sensor Heater

Control circuit for more than 160 ms.

P0037-1/2 O2 SENSOR HEATER CIRCUIT LOW

When Monitored:

With the engine running and O2 Sensor operation >0.

Set Condition:

When the PCM detects a short to ground on the 1/2 O2 Sensor Heater

Control circuit for more than 160 ms.

POSSIBLE CAUSES

O2 HEATER ELEMENT

O2 SENSOR HEATER CONTROL CIRCUIT SHORT TO GROUND

ASD RELAY OUTPUT CIRCUIT OPEN

INTERMITTENT CONDITION

PCM

TEST

ACTION

APPLICABILITY

Turn the ignition on.
With the DRBIII

t, read DTCs.

Does the Good Trip Indicator display NO?

All

Yes

→ Go To 3

→ Go To 2

NOTE: Allow the O2 Sensor voltage to stabilize to between 0.4 to 0.6 volts
before continuing the test.
Turn the ignition on.
With the DRBIII

t, actuate the O2 Heater Relay.

With the DRBIII

t, monitor O2 Sensor voltage for at least 2 minutes.

Does the voltage stay between 0.4 and 0.6 volts?

All

Yes

→ Go To 3

→ Go To 7

DRIVEABILITY - 1.6L GAS

TEST

ACTION

APPLICABILITY

NOTE: Allow the O2 Sensor voltage to stabilize to between 0.4 and 0.6 volts
before continuing the test.
Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Measure the resistance across the O2 Sensor Heater element at the component side
of the connector.
NOTE: Heater Resistance Specification for 1/1 and 1/2 O2 Sensor is from 3 to
20 ohms.
Is the O2 Sensor Heater element within specification?

All

Yes

→ Go To 4

→ Replace the O2 Sensor.

Perform POWERTRAIN VERIFICATION TEST VER - 5 - 1.6L.

All

Yes

→ Repair the O2 Sensor Heater Control circuit for a short to ground.

Perform POWERTRAIN VERIFICATION TEST VER - 5 - 1.6L.

→ Go To 5

Turn the ignition off.
Disconnect the O2 Sensor harness connector.
With the DRBIII

t, actuate the O2 Heater Relay.