Chrysler RG Voyager. Manual — part 551
Symptom:
P0129-BAROMETRIC PRESSURE OUT-OF-RANGE LOW
When Monitored and Set Condition:
P0129-BAROMETRIC PRESSURE OUT-OF-RANGE LOW
When Monitored:
With the ignition key on. No Cam or Crank signal within 75 ms. Engine
speed at less than 250 RPM.
Set Condition:
The PCM senses the voltage from the MAP sensor to be less than 2.196
volts but above 0.0392 of a volt for 300 milliseconds.One Trip Fault.
POSSIBLE CAUSES
IAC SIGNAL CIRCUIT LOW
IAC SIGNAL CIRCUIT HIGH
INTERMITTENT CONDITION
(K6) 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
(K6) 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND
(K6) 5 VOLT SUPPLY CIRCUIT OPEN
MAP SENSOR INTERNAL FAILURE
(K1) MAP SIGNAL CIRCUIT OPEN
(K1) MAP SIGNAL CIRCUIT SHORTED TO GROUND
PCM (K6) 5 VOLT SUPPLY CIRCUIT
PCM (K1) MAP SIG CIRCUIT
TEST
ACTION
APPLICABILITY
1
NOTE: Refer to any TSBs that may apply to this DTC before proceeding.
Ignition on, engine not running.
With the DRBIII
t, read the MAP Sensor voltage.
Is the voltage below 2.2 volts.
All
Yes
→ Go To 2
No
→ Go To 11
2
Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Ignition on, engine not running.
Measure the voltage of the (K6) 5 Volt Supply circuit in the MAP Sensor harness
connector.
Is the voltage between 4.5 to 5.2 volts?
All
Yes
→ Go To 3
No
→ Go To 7
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TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Ignition on, engine not running.
With the DRBIII
t, monitor the MAP Sensor voltage.
Is the voltage above 2.2 volts?
All
Yes
→ Replace the MAP Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 4
4
Turn the ignition off.
Disconnect the MAP 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 (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
Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Disconnect the PCM harness connector.
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 6
6
NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, or 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.
7
Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Ignition on, engine not running.
Measure the voltage of the (K6) 5 Volt Supply circuit in the MAP Sensor harness
connector.
Is the voltage above 5.2 volts?
All
Yes
→ Repair the short to battery voltage in the (K6) 5 Volt Supply
circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 8
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P0129-BAROMETRIC PRESSURE OUT-OF-RANGE LOW —
Continued
TEST
ACTION
APPLICABILITY
8
Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between ground and the (K6) 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 (K6) 5 Volt Supply circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 9
9
Turn the ignition off.
Disconnect the MAP 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 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 10
No
→ Repair the open in the (K6) 5 Volt Supply circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
10
NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, or 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.
11
Start the engine.
NOTE: If the engine will not idle, maintain an engine speed between 800 and
1500 RPM.
Allow the engine to idle.
With the DRBIII
t, read the IAC Current.
Is the IAC Current below 146 mA?
All
Yes
→ Refer to P0508 - IAC Valve Sense Low
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 12
12
Start the engine.
NOTE: If the engine will not idle, maintain an engine speed between 800 and
1500 RPM.
Allow the engine to idle.
With the DRBIII
t, read the IAC Current.
Is the IAC Current above 999 mA?
All
Yes
→ Refer to P0509 - IAC Valve Sense Circuit High
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Refer to the INTERMITTENT CONDITION symptom in the
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
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P0129-BAROMETRIC PRESSURE OUT-OF-RANGE LOW —
Continued
Symptom List:
P0131-O2 SENSOR 1/1 VOLTAGE LOW
P0137-O2 SENSOR 1/2 VOLTAGE LOW
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0131-O2 SENSOR 1/1 VOLTAGE
LOW.
When Monitored and Set Condition:
P0131-O2 SENSOR 1/1 VOLTAGE LOW
When Monitored:
Engine Running.
Set Condition:
The oxygen sensor signal voltage is below 2.402 volts for 9 seconds. Two
trip Fault.
P0137-O2 SENSOR 1/2 VOLTAGE LOW
When Monitored:
Engine Running.
Set Condition:
The oxygen sensor signal voltage is below 2.402 volts for 9 seconds. Two
trip Fault.
POSSIBLE CAUSES
O2 SENSOR BELOW 2.52 VOLTS
O2 SENSOR
O2 RETURN CIRCUIT SHORTED TO GROUND
O2 SIGNAL CIRCUIT SHORTED TO GROUND
O2 SIGNAL CIRCUIT SHORTED TO O2 RETURN CIRCUIT
O2 SIGNAL SHORTED TO HEATER GROUND CIRCUIT
PCM RETURN CIRCUIT
PCM SIGNAL CIRCUIT
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DRIVEABILITY - NGC
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