Dodge Dakota (R1). Manual — part 841
POSSIBLE CAUSES
INTERMITTENT CONDITION
PCM
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read DTC’s.
Is the Good Trip counter for this DTC displayed and equal to zero?
All
No
→
Yes
→
2
Turn the ignition off.
NOTE: Wait a minimum of 8 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 volt.
All
Yes
→
No
→
3
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.
If this is a 2.5L is it between 4.0 and 5.0 ohms at 70° F(21° C)?
If this is a 3.9L or 5.9L is it between 3.3 and 4.1 ohms for before cat O2’s or between
4.0 and 5.0 ohms for after the cat O2’s at 70° F(21° C)?
If this is a 4.7L is it between 12.1 and 14.8 ohms at 70° F(21° C)?
All
Yes
→
No
→
Replace the O2 Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
4
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
→
No
→
Repair the O2 Sensor Heater ground circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
96
DRIVEABILITY - GAS
P0135-1/1 O2 SENSOR HEATER FAILURE —
Continued
TEST
ACTION
APPLICABILITY
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 O2 Heater Relay Output circuit in the O2 Sensor harness
connector.
Is the voltage above 11.0 volts?
All
Yes
→
No
→
Repair the O2 Heater Relay Output circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
6
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.
7
WARNING: KEEP CLEAR OF THE ENGINE’S MOVING PARTS.
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 DRBIII
t
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.
No
→
Test Complete.
97
DRIVEABILITY - GAS
P0135-1/1 O2 SENSOR HEATER FAILURE —
Continued
Symptom:
P0136-1/2 O2 SENSOR HEATER CIRCUIT MALFUNCTION
When Monitored and Set Condition:
P0136-1/2 O2 SENSOR HEATER CIRCUIT MALFUNCTION
When Monitored:
Ignition ON, with battery voltage greater than 10.4 volts.
Set Condition:
The state of the PCM relay control circuit, between the PCM and relay
coil, does not match the desired state.
POSSIBLE CAUSES
OPEN CIRCUIT BETWEEN RELAY AND FUSE
OPEN CIRCUIT BETWEEN RELAY AND PCM
OPEN COIL AT THE O2S HEATER RELAY
OPEN FUSE
PCM
SHORT TO GROUND BETWEEN RELAY AND FUSE
SHORT TO GROUND BETWEEN RELAY AND PCM
WIRING HARNESS INTERMITTENT
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read DTCs.
Is the DTC Good Trip Counter displayed and equal to zero?
All
Yes
→
No
→
2
Determine if the O2S Heater Relay Fuse is OPEN.
Is the O2S Heater Relay Fuse OPEN.
All
Yes
→
No
→
3
Turn the ignition off. Remove the Relay and Fuse from the PDC.
Measure the resistance of the O2S Heater Relay Fused B+ circuit between the O2S
Heater Relay connector and Engine Ground.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the Short to Ground, then replace the O2S Heater Relay
Fuse.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
98
DRIVEABILITY - GAS
TEST
ACTION
APPLICABILITY
4
Turn ignition off.
Press CONTINUE to view repair options.
All
Continue
Replace the FUSE.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
5
Turn the ignition off. Remove the Heater Relay from the PDC.
Measurement is taken at the Heater Relay component.
Measure the resistance of the O2S Heater Relay Coil.
Is the resistance above 100 ohms?
All
Yes
→
Replace the O2S Heater Relay.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
6
Turn ignition off. Remove the Relay. Remove the Fuse.
Measure the resistance of the O2S Heater Relay Fused B+ circuit between the O2S
Heater Relay connector and the PDC connector.
Is the resistance below 5.0 ohms?
All
No
→
Repair the OPEN circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Yes
→
7
Turn the ignition off. Remove the Relay from the PDC. Disconnect the PCM harness
connector(s).
Measure the resistance of the O2S Heater Relay Signal circuit between the O2S
Heater Relay (Heater Relay Signal) connector and the PCM (Heater Relay Signal)
harness connector.
Is the resistance below 5.0 ohms?
All
No
→
Repair the OPEN circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Yes
→
8
Turn the ignition off. Remove the Relay from the PDC. Disconnect the PCM harness
connector(s).
Measure the resistance of the O2S Heater Relay Signal circuit between the O2S
Heater Relay connector and Engine Ground.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the Short to Ground.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
9
If there are no possible causes remaining, replace the PCM.
View repair options.
All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
99
DRIVEABILITY - GAS
P0136-1/2 O2 SENSOR HEATER CIRCUIT MALFUNCTION —
Continued
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