Dodge Caliber. Manual - part 715

(K902) O2 1/1 RETURN CIRCUIT OPEN OR HIGH RESISTANCE

Measure the resistance of the (K902) O2 1/1 Return circuit between the
Oxygen Sensor 1/1 harness connector to the Powertrain Control Module
(PCM) harness connector.

Is the resistance below 5.0 ohms?

Yes

>> Go to 9

>> Repair the (K902) O2 1/1 Return circuit for an open circuit

or high resistance.

Perform the PCM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).

OXYGEN SENSOR 1/1

NOTE: Prior to replacing the O2 sensor, verify that the correct part number is being used in order to prevent
improper O2 heater control.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Oxygen Sensor 1/1
and the Powertrain Control Module (PCM).

Look for any chafed, pierced, pinched, or partially broken wires.

Look for broken, bent, pushed out or corroded terminals.

Refer to any Technical Service Bulletins that may apply.

Were any problems found?

Yes

>> Repair as necessary.

Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

>> Replace the Oxygen Sensor 1/1 in accordance with the Service Information.

Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

ENGINE ELECTRICAL DIAGNOSTICS - GPEC

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P0135-O2 SENSOR 1/1 HEATER PERFORMANCE

For a complete wiring diagram Refer to Section 8W.

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ENGINE ELECTRICAL DIAGNOSTICS - GPEC

Theory of Operation

The PCM performs a continuous check of the O2 sensor heater circuit during operation. The heater circuit is
momentarily disabled to allow a resistance measurement to be taken to infer heater temperature. The current deliv-
ery to the heater is duty cycled to maintain a specific target temperature. The error from the target temperature is
continuously monitored to assess heater performance.

•

When Monitored:
With the engine running, O2 sensor heater duty cycle greater than 0%, and battery voltage greater than 11.0
volts.

•

Set Condition:
The PCM detects no O2 sensor output when the heater is powered up. Two trip fault. Three good trips to turn
off the MIL.

Possible Causes

(K99) O2 1/1 HEATER CONTROL CIRCUIT OPEN OR HIGH RESISTANCE

(Z916) GROUND CIRCUIT OPEN OR HIGH RESISTANCE

OXYGEN SENSOR 1/1

POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).

Diagnostic Test

OXYGEN SENSOR 1/1 HEATER CONTROL OPERATION

Turn the ignition off.

NOTE: Wait a minimum of 8 minutes to allow the sensor to cool down before continuing. The sensor volt-
age should stabilize between 4.6 and 5.0 volts.
Turn the ignition on.

With a scan tool, actuate the Oxygen Sensor 1/1 control.

With the scan tool, monitor Oxygen Sensor 1/1 voltage for at least 2 minutes.

Does the voltage stay above 4.5 volts?

Yes

>> Go to 2

>> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE -

DIAGNOSIS AND TESTING)

OXYGEN SENSOR 1/1

Turn the ignition off.

NOTE: Allow the O2 sensor to cool down to room temperature.
Disconnect the Oxygen Sensor 1/1 harness connector.

Measure the resistance of the O2 sensor heater element across the Oxygen Sensor 1/1 connector between the
heater control terminal and the ground terminal.

NOTE: The O2 heater element resistance should be measured at 70° F (21.1° C). The resistance value will
vary at different temperatures.

Is the resistance between 2.0 and 30.0 ohms?

Yes

>> Go to 3

>> Replace the Oxygen Sensor 1/1 in accordance with the Service Information.

Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

ENGINE ELECTRICAL DIAGNOSTICS - GPEC

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(K99) O2 1/1 HEATER CONTROL CIRCUIT OPEN OR HIGH RESISTANCE

Disconnect the Powertrain Control Module (PCM) harness connector.

Measure the resistance of the (K99) O2 1/1 Heater Control circuit from
the Oxygen Sensor 1/1 harness connector to the Powertrain Control
Module (PCM) harness connector.

Is the resistance below 0.5 ohm?

Yes

>> Go to 4

>> Repair the (K99) O2 1/1 Heater Control circuit for an open

circuit or high resistance.

Perform the PCM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).

(Z916) GROUND CIRCUIT OPEN OR HIGH RESISTANCE

Using a 12 volt test light connected to 12 volts, check the (Z916)
Ground circuit in the Oxygen Sensor 1/1 harness connector.

NOTE: The test light should be illuminated and bright. Compare
the brightness to that of a direct connection to the battery.

Is the test light illuminated and bright?

Yes

>> Go to 5

>> Repair the (Z916) Ground circuit for an open circuit or high

resistance.

Perform the PCM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).

POWERTRAIN CONTROL MODULE (PCM)

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Oxygen Sensor 1/1
and the Powertrain Control Module (PCM).

Look for any chafed, pierced, pinched, or partially broken wires.

Look for broken, bent, pushed out or corroded terminals.

Refer to any Technical Service Bulletins that may apply.

Were any problems found?

Yes

>> Repair as necessary.

Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

>> Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.

Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

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ENGINE ELECTRICAL DIAGNOSTICS - GPEC

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