Dodge Neon / Neon SRT-4. Manual - part 549

TEST

ACTION

APPLICABILITY

Turn the ignition off.
NOTE: Allow the O2 Sensor to cool down before continuing the test. The O2
voltage should stabilize at 5.0 volts. Raising the hood may help in reducing
under hood temps.
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 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.

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: Heater Resistance Specification: 3 to 20 ohms for Upstream and
Downstream O2 Sensors.
Is the resistance within the specifications?

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 between an engine ground and the O2 Heater Ground circuit
in the O2 Sensor harness connector.
Is the resistance below 0.5 of an ohm?

All

Yes

→ Go To 5

→ Repair the open/high resistance in the O2 Heater Ground circuit.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

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 0.5 of an ohm?

All

Yes

→ Go To 6

→ Repair the open/high resistance in the O2 Heater Control circuit.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

101

DRIVEABILITY - NGC

P0135-O2 SENSOR 1/1 HEATER PERFORMANCE —

Continued

TEST

ACTION

APPLICABILITY

NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, terminal push out. Repair as necessary.
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.

102

DRIVEABILITY - NGC

P0135-O2 SENSOR 1/1 HEATER PERFORMANCE —

Continued

Symptom:

P0171-FUEL SYSTEM 1/1 LEAN

When Monitored and Set Condition:

P0171-FUEL SYSTEM 1/1 LEAN

When Monitored:

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

temperature above (-7°C)20°F, altitude below 8500 ft and fuel level greater than 15%.

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 SIGNAL CIRCUIT

O2 RETURN CIRCUIT

O2 SENSOR HEATER OPERATION

THROTTLE POSITION SENSOR SWEEP

MAP SENSOR OPERATION

ECT SENSOR OPERATION

ENGINE MECHANICAL PROBLEM

FUEL CONTAMINATION/EXHAUST LEAK

TEST

ACTION

APPLICABILITY

NOTE: Check for contaminants that may have damaged the O2 Sensor:
contaminated fuel, unapproved silicone, oil and coolant.
NOTE: Diagnose any Misfire DTC(s) first, if set along with the fuel system
DTC.
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 2

→ Refer to the INTERMITTENT CONDITION symptom in the

Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER - 5.

103

DRIVEABILITY - NGC

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.
Ignition on, engine not running.
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

Below Specification

Go To

Caution: Stop All Actuations.

NOTE: If one of the O2 Sensors Signal or Return circuits are shorted to
ground or voltage, all the other O2 Sensor voltage readings will be affected.
NOTE: After the repairs have been made, verify proper O2 Sensor operation.
If all the O2 Sensor voltage readings have not returned to normal, follow the
diagnostic procedure for the remaining O2 Sensors.
Start the engine.
Allow the engine to reach normal operating temperature.
With the DRBIII

t, read the O2 Sensor voltage.

Is the voltage switching between 2.5 and 3.4 volts?

All

Yes

→ Go To 4

→ Go To 9

t, actuate the O2 Heater Test.

With the DRBIII

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

Does the voltage stay above 4.5 volts?

All

Yes