Chrysler Town, Dodge Caravan. Manual - part 605

TEST

ACTION

APPLICABILITY

Turn the ignition off.
NOTE: Allow the O2 Sensor to cool down before continuing the test. The O2
Sensor voltage should stabilize at 5.0 volts. Raising the hood may help in
reducing under hood temps quicker.
Ignition on, engine not running.
With the DRBIII

t, actuate the O2 Heater Test.

With the DRBIII

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

Does the O2 Sensor voltage stay above 4.5 volts?

All

Yes

→ Go To 3

→ Refer to the INTERMITTENT CONDITION symptom in the

Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.

Turn the ignition off.
NOTE: Allow the O2 sensor to cool down to room temperature.
Disconnect the O2 Sensor harness connector.
Measure the resistance across the O2 Sensor Heater element component side.
NOTE: Heater Resistance Specification: 1/1 and 2/1 = 3.0 to 4.0 ohms or 1/2
and 2/2 = 4.0 to 5.0 ohms.
Is the O2 Sensor Heater element within specification?

All

Yes

→ Go To 4

→ Replace the O2 Sensor.

Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.

Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Ignition on, engine not running.
With the DRBIII

t, actuate the O2 Heater Test.

Using a 12-volt test light connected to ground, probe the O2 Heater Control circuit in
the O2 Sensor harness connector.
Does the test illuminate brightly and flash on and off?

All

Yes

→ Replace the O2 Sensor.

Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.

→ Go To 5

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

All

Yes

→ Repair the short to ground in the O2 Sensor Heater Control

circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.

→ NOTE: Before continuing, check the PCM harness connector

terminals for corrosion, damage, or terminal push out. Repair as
necessary. Replace and program the Powertrain Control Module
in accordance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.

228

DRIVEABILITY - NGC

P0031-O2 SENSOR 1/1 HEATER CIRCUIT LOW —

Continued

Symptom List:

P0032-O2 SENSOR 1/1 HEATER CIRCUIT HIGH
P0038-O2 SENSOR 1/2 HEATER CIRCUIT HIGH

Test Note:

All symptoms listed above are diagnosed using the same tests.

The title for the tests will be P0032-O2 SENSOR 1/1 HEATER
CIRCUIT HIGH.

When Monitored and Set Condition:

P0032-O2 SENSOR 1/1 HEATER CIRCUIT HIGH

When Monitored:

Battery voltage above 10.6 volts, ASD is powered up, and O2 heater is

off.

Set Condition:

Desired state does not equal Actual state.

P0038-O2 SENSOR 1/2 HEATER CIRCUIT HIGH

When Monitored:

Battery voltage above 10.6 volts, ASD is powered up, and O2 heater is

off.

Set Condition:

Desired state does not equal Actual state.

POSSIBLE CAUSES

O2 SENSOR HEATER OPERATION

O2 HEATER ELEMENT

O2 HEATER GROUND CIRCUIT OPEN

O2 SENSOR

O2 HEATER CONTROL SHORTED TO VOLTAGE

O2 HEATER CONTROL CIRCUIT OPEN

PCM

TEST

ACTION

APPLICABILITY

Ignition on, engine not running.
With the DRBIII

t, read DTCs and record the related Freeze Frame data.

Is the Good Trip Counter displayed and equal to zero?

All

Yes

→ Go To 3

→ Go To 2

229

DRIVEABILITY - NGC

TEST

ACTION

APPLICABILITY

t, actuate the O2 Heater Test.

With the DRBIII

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

Does the O2 Sensor voltage stay above 4.5 volts?

All

Yes

→ Go To 3

→ Refer to the INTERMITTENT CONDITION symptom in the

Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.

All

Yes

→ Go To 4

→ Replace the O2 Sensor.

Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.

Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Ignition on, engine not running.
With the DRBIII

t, actuate the O2 Heater Test.

Using a 12-volt test light connected to ground, probe the O2 Heater Control circuit in
the O2 Sensor harness connector.
Does the test illuminate brightly and flash on and off?

All

Yes

→ Go To 5

→ Go To 6

Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Measure the resistance between engine ground and the O2 Heater ground circuit in
the O2 Sensor harness connector.
Is the resistance below 5.0 ohms?

All

Yes

→ Replace the O2 Sensor.

Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.

→ Repair the open in the O2 Heater ground circuit.

Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.

230

DRIVEABILITY - NGC

P0032-O2 SENSOR 1/1 HEATER CIRCUIT HIGH —

Continued

TEST

ACTION

APPLICABILITY

Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Disconnect the PCM harness connector.
Ignition on, engine not running.
Measure the voltage on the O2 Heater Control circuit at the O2 Sensor harness
connector.
Does the voltmeter indicate any voltage present?

All

Yes

→ Repair the short to voltage in the O2 Heater Control circuit.

Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.

→ Go To 7

Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Disconnect the PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the O2 Heater Control circuit from the O2 Sensor harness
connector to the appropriate terminal of special tool #8815
Is the resistance below 5.0 ohms?

All

Yes

→ NOTE: Before continuing, check the PCM harness connector

→ Repair the open in the O2 Heater Control circuit.

Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.

231

DRIVEABILITY - NGC

P0032-O2 SENSOR 1/1 HEATER CIRCUIT HIGH —

Continued

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