Jeep Wrangler TJ. Manual — part 91
TEST
ACTION
APPLICABILITY
3
With the DRBIII
t, monitor the MAP Sensor voltage with the Sensor harness
connector disconnected.
Is the voltage above 4.5 volts?
All
Yes
→ Replace the MAP Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 4
4
Turn the ignition off.
Disconnect the C1 and C2 PCM harness connectors.
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 (K1) MAP Signal circuit from the MAP Sensor harness
connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 5
No
→ Repair the open in the (K1) MAP Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
5
Measure the resistance between ground and the (K1) MAP Signal circuit at the MAP
Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes
→ Repair the short to ground in the (K1) MAP Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 9
6
Turn the ignition off.
Disconnect the C1 and C2 PCM harness connectors.
Ignition on, engine not running.
Measure the voltage on the (F856) 5-volt Supply circuit at the MAP Sensor harness
connector.
Is the voltage above 5.2 volts?
All
Yes
→ Repair the short to voltage in the (F856) 5-volt Supply circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 7
7
Turn the ignition off.
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 (F856) 5-volt Supply circuit from the MAP Sensor
harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 8
No
→ Repair the open in the (F856) 5-volt Supply circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
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P0129-BAROMETRIC PRESSURE OUT-OF-RANGE —
Continued
TEST
ACTION
APPLICABILITY
8
Measure the resistance between ground and the (F856) 5-volt Supply circuit at the
MAP Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes
→ Repair the short to ground in the (F856) 5-volt Supply circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 9
9
NOTE: Before continuing, check the PCM harness connector 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 per Service
Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
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P0129-BAROMETRIC PRESSURE OUT-OF-RANGE —
Continued
Symptom List:
P0131-O2 SENSOR 1/1 CIRCUIT LOW VOLTAGE
P0137-O2 SENSOR 1/2 CIRCUIT LOW VOLTAGE
P0151-O2 SENSOR 2/1 CIRCUIT LOW VOLTAGE
P0157-O2 SENSOR 2/2 CIRCUIT LOW VOLTAGE
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0131-O2 SENSOR 1/1 CIRCUIT
LOW VOLTAGE.
When Monitored and Set Condition:
P0131-O2 SENSOR 1/1 CIRCUIT LOW VOLTAGE
When Monitored:
Engine running for less than 30 seconds and the O2 Sensor Heater
Temperature is less than 251°C (484°F) with battery voltage greater 10.4 volts.
Set Condition:
The oxygen sensor signal voltage is below 2.411 volts for 10.24 seconds
after starting engine. One Trip Fault.
P0137-O2 SENSOR 1/2 CIRCUIT LOW VOLTAGE
When Monitored:
Engine running for less than 30 seconds and the O2 Sensor Heater
Temperature is less than 251°C (484°F) with battery voltage greater 10.4 volts.
Set Condition:
The oxygen sensor signal voltage is below 2.411 volts for 10.24 seconds
after starting engine. One Trip Fault.
P0151-O2 SENSOR 2/1 CIRCUIT LOW VOLTAGE
When Monitored:
Engine running for less than 30 seconds and the O2 Sensor Heater
Temperature is less than 251°C (484°F) with battery voltage greater 10.4 volts.
Set Condition:
The oxygen sensor signal voltage is below 2.411 volts for 10.24 seconds
after starting engine. One Trip Fault.
P0157-O2 SENSOR 2/2 CIRCUIT LOW VOLTAGE
When Monitored:
Engine running for less than 30 seconds and the O2 Sensor Heater
Temperature is less than 251°C (484°F) with battery voltage greater 10.4 volts.
Set Condition:
The oxygen sensor signal voltage is below 2.411 volts for 10.24 seconds
after starting engine. One Trip Fault.
POSSIBLE CAUSES
O2 SENSOR BELOW 2.52 VOLTS
O2 SENSOR
O2 RETURN CIRCUIT SHORTED TO GROUND
PCM
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TEST
ACTION
APPLICABILITY
1
Start the engine.
Allow the engine to reach normal operating temperature.
NOTE: When diagnosing this DTC, diagnose the O2 Sensor that set the DTC.
With the DRBIII
t, read the O2 Sensor voltage.
Is the voltage below 2.52 volts?
All
Yes
→ Go To 2
No
→ Refer to the INTERMITTENT CONDITION Symptom (Diagnos-
tic Procedure).
Perform POWERTRAIN VERIFICATION TEST VER - 5.
2
Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Ignition on, engine not running.
With the DRBIII
t, monitor the O2 Sensor voltage.
Is the O2 Sensor voltage above 4.8 volts?
All
Yes
→ Go To 3
No
→ Go To 4
3
Measure the voltage on the O2 Return circuit at the O2 Sensor harness connector.
Is the voltage at 2.5 volts?
All
Yes
→ Replace the O2 Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 4
4
Turn the ignition off.
Disconnect the PCM harness connectors.
Measure the resistance between ground and the O2 Return circuit at the O2 Sensor
harness connector.
Is the resistance below 100 ohms?
All
Yes
→ Repair the short to ground in the O2 Return circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 5
5
NOTE: Before continuing, check the PCM harness connector 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 per Service
Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
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P0131-O2 SENSOR 1/1 CIRCUIT LOW VOLTAGE —
Continued
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