Chrysler Town, Dodge Caravan. Manual - part 567

TEST

ACTION

APPLICABILITY

NOTE: Allow the O2 sensor to cool down to room temperature.
Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Measure the resistance across the O2 Sensor Heater element component side.
NOTE: O2 Sensor Heater Resistance Specification: 1/1 and 2/1 O2 Sensor 3.0
to 4.0 ohms 2/1 and 2/2 4.0 to 5.0 ohms.
Is the resistance between 4.0 and 7.0 ohms?

All

Yes

→ Go To 4

→ Replace the O2 Sensor.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

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

All

Yes

→ Go To 5

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

Perform POWERTRAIN VERIFICATION TEST VER - 5.

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

t, actuate the O2 Heater Test.

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 open in the ASD Relay Output circuit.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

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.

DRIVEABILITY - SBEC

P0141-1/2 O2 SENSOR HEATER FAILURE —

Continued

Symptom:

P0171-1/1 FUEL SYSTEM LEAN

When Monitored and Set Condition:

P0171-1/1 FUEL SYSTEM LEAN

When Monitored:

With the engine running in closed loop mode, the ambient/battery

temperature above 20 deg. F and altitude below 8000 ft.

Set Condition:

If the PCM multiplies short term compensation by long term adaptive and

a certain percentage is exceeded for two trips, a freeze frame is stored, the MIL illuminates
and a trouble code is stored.

POSSIBLE CAUSES

GOOD TRIP EQUAL TO ZERO

RESTRICTED FUEL SUPPLY LINE

FUEL PUMP INLET STRAINER PLUGGED

FUEL PUMP MODULE

O2 SENSOR

O2 SENSOR SIGNAL CIRCUIT SHORTED TO GROUND

O2 SENSOR HEATER OPERATION

THROTTLE POSITION SENSOR VOLTAGE GREATER THAN 0.92 VOLTS WITH THROTTLE
CLOSED

TP SENSOR SWEEP

MAP SENSOR OPERATION

ECT SENSOR OPERATION

ENGINE MECHANICAL PROBLEM

FUEL FILTER/PRESSURE REGULATOR (HIGH)

PCM

TEST

ACTION

APPLICABILITY

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

t, read DTC’s.

Is the Good Trip displayed and equal to zero?

All

Yes

→ Go To 2

→ Refer to the INTERMITTENT CONDITION symptom in the

Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER - 5.

DRIVEABILITY - SBEC

TEST

ACTION

APPLICABILITY

Warning: The fuel system is under a constant pressure (even with the engine
off). Before testing or servicing any fuel system hose, fitting or line, the fuel
system pressure must be released.
Install a fuel pressure gauge to the fuel rail.
Turn the ignition on.
With the DRBIII

t, actuate the ASD Fuel System test and observe the fuel pressure

gauge.
NOTE: Fuel pressure specification is 400 KPa +/- 34 KPa (58 psi +/- 5 psi).
Turn the ignition off.
Choose a conclusion that best matches your fuel pressure reading.

All

Within Specification

Go To

Above Specification

Replace the fuel filter/pressure regulator.
Perform POWERTRAIN VERIFICATION TEST VER - 5.

Below Specification

Go To

Caution: Stop All Actuations.

Turn the ignition on
With the DRBIII

t, read the O2 Sensor voltage.

Is the voltage between 0.4 to 0.6 volts?

All

Yes

→ Go To 4

→ Go To 10

Turn the ignition off.
NOTE: Wait a minimum of 10 minutes to allow the O2 Sensor to cool down
before continuing the test. Allow the O2 Sensor voltage to stabilize between
0.4 to 0.6 volts.
Turn the ignition on.
With the DRBIII

t, actuate the O2 Heater Test.

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

→ Replace the O2 Sensor.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

→ Go To 5

Turn the ignition on.
With the DRBIII

t, read TP Sensor voltage.

NOTE: The throttle must be against the stop.
Is the TP Sensor voltage 0.92 or less with the throttle closed?

All

Yes

→ Go To 6

→ Check for a binding throttle condition. If OK, replace the TP

Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.

DRIVEABILITY - SBEC

P0171-1/1 FUEL SYSTEM LEAN —

Continued

TEST

ACTION

APPLICABILITY

Turn the ignition on.
With the DRBIII

t, read the TP Sensor voltage.

While monitoring the DRBIII

t, slowly open and close the throttle.

Does the voltage increase and decease smoothly?

All

Yes

→ Go To 7

→ Replace the TP Sensor.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

Turn the ignition off.
Connect a Vacuum Gauge to a Manifold Vacuum source.
Start the engine.
Allow the engine to idle.
Note: If engine will not idle, maintain a constant RPM above idle.
With the DRBIII

t in Sensors, read the MAP Sensor vacuum value.

Is the DRBIII

t reading within 19 of the Vacuum Gauge reading?

All

Yes

→ Go To 8

→ Replace the MAP Sensor.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

Note: For this test to be valid, the thermostat must be operating correctly.
Note: This test works best if performed on a cold engine (cold soak)
Turn the ignition on.
With the DRBIII

t, read the Engine Coolant Temperature (ECT) Sensor value. If the

engine was allowed to sit overnight (cold soak), the temperature value should be a
sensible value that is somewhere close to the ambient temperature.
Note: If engine coolant temperature is above 82°C (180°F), allow the engine
to cool until 65°C (150°F) is reached.
Start the Engine.
During engine warm-up, monitor the Engine Coolant Temperature value. The
temperature value change should be a smooth transition from start up to normal
operating temperature 82°C (180°F). The value should reach at least 82°C (180°F).
Did the Engine Coolant Temperature value increase a smooth transition and did it
reach at least 82°C

All

Yes

→ Go To 9

→ Replace the Engine Coolant Temperature Sensor.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

Check for any of the following conditions/mechanical problems.
AIR INDUCTION SYSTEM - must be free from leaks.
ENGINE VACUUM - must be at least 13 inches in neutral
ENGINE VALVE TIMING - must be within specifications
ENGINE COMPRESSION - must be within specifications
ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks.
ENGINE PCV SYSTEM - must flow freely
TORQUE CONVERTER STALL SPEED - must be within specifications
POWER BRAKE BOOSTER - no internal vacuum leaks
FUEL - must be free of contamination
FUEL INJECTOR - plugged or restricted injector; control wire not connected to
correct injector
Are there any engine mechanical problems?

All

Yes

→ Repair as necessary.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

→ Test Complete.

DRIVEABILITY - SBEC

P0171-1/1 FUEL SYSTEM LEAN —

Continued

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