Diagnostic Test

WARNING: This page is about a different car, the 2014 Dodge Journey. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC
NOTE:
Check for contaminates that may have damaged an O2 Sensor: contaminated fuel, unapproved silicone, oil and coolant.
1. Start the engine.
2. Allow the engine to reach normal operating temperature.
3. With the scan tool, read DTCs.
  NOTE:
  It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data.
  
  Is the DTC Active or Pending at this time?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK FUEL PRESSURE
1. Perform the CHECKING THE FUEL DELIVERY SYSTEM test procedure. Refer to DIAGNOSIS AND TESTING .
  NOTE:
  Fuel pressure specification is 400 kPa +/- 14 kPa (58 psi +/- 2 psi).
2. Turn the ignition off.
  Were any fuel system issues found ?
  
  Yes
  - Perform the appropriate repairs.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 3
O2 SENSOR OPERATION
1. Start the engine.
2. Allow the engine to reach normal operating temperature.
  NOTE:
  If one of the O2 Sensor Signal or Return circuits is 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.
3. Using the scan tool, monitor the O2 Sensor 1/1 voltage readings.
  Is the voltage switching between 2.5 and 3.4 volts?
  
  Yes
  - Go To 4
  No
  - Go To 9
O2 SENSOR 1/1 HEATER OPERATION
1. Turn the ignition off.
  NOTE:
  Wait a minimum of 10 minutes to allow the O2 Sensor to cool down before continuing the test. Allow the O2 Sensor voltage to stabilize at 5.0 volts.
2. Ignition on, engine not running.
3. Using the scan tool, perform the O2 Sensor 1/1 Heater Test.
4. Using the scan tool, monitor the O2 Sensor 1/1 voltage while performing the Heater test for at least two minutes.
  Does the voltage stay above 4.5 volts during the Heater test?
  
  Yes
  - Verify that there is good pin to terminal contact in the O2 Sensor and Powertrain Control Module connectors. Replace the O2 Sensor if no problems were found with the connectors.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 5
MAP SENSOR OPERATION
1. Ignition on, engine not running.
2. With the scan tool, read the Barometric Pressure.
  NOTE:
  The Barometric Pressure should be approximately equal to the actual barometric pressure. If necessary, compare the barometric pressure value of this vehicle to the value of a known good vehicle of a similar make and model.
3. Turn the ignition off.
4. Connect a Vacuum Gauge to a Manifold Vacuum source.
5. Start the engine.
6. Allow the engine to idle.
  NOTE:
  If engine will not idle, maintain a constant RPM above idle.
7. With the scan tool, read the MAP Sensor vacuum value.
  Is the scan tool reading for MAP Vacuum within 1 inch of the Vacuum Gauge reading and is the Barometric Pressure reading of the vehicle the approximately the same as actual Barometric Pressure?
  
  Yes
  - Go To 6
  No
  - Verify that there is good pin to terminal contact in the MAP Sensor and Powertrain Control Module connectors. Replace the MAP Sensor if no problems were found with the connectors.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
    NOTE:
    Remove the vacuum gauge before continuing.
ECT SENSOR OPERATION
NOTE:
For this test to be valid, the thermostat must be operating correctly.

NOTE:
This test works best if performed on a cold engine (cold soak).
1. Ignition on, engine not running.
2. With the scan tool, read the Engine Coolant Temperature Sensor value. If the engine was allowed to sit overnight (cold soak), the temperature value should be a sensible value that is somewhere close to the ambient temperature.
  NOTE:
  If engine coolant temperature is above 82°C (180°F), allow the engine to cool until 65°C (150°F) is reached.
3. Start the Engine.
4. During engine warm-up, monitor the Engine Coolant Temperature value. The temperature value change should be a smooth transition from start up to normal operating temperature 82°C (180°F). The value should reach at least 82°C (180°F).
  Did the ECT value increase smoothly and reach at least 82°C (180°F)?
  
  Yes
  - Go To 7
  No
  - Verify that there is good pin to terminal contact in the ECT Sensor and Powertrain Control Module connectors. Replace the Engine Coolant Temperature Sensor if no problems were found with the connectors.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
EVAP PURGE SOLENOID OPERATION
NOTE:
After disconnecting the Evap Purge Solenoid vacuum connections, inspect the lines and solenoid for signs of contamination.
1. Disconnect the vacuum hoses at the Evap Purge Solenoid.
2. Using a hand vacuum pump, apply 1.0 in. Hg. to the "ENGINE" side of the Evap Purge Solenoid.
  NOTE:
  The solenoid should hold vacuum for a minimum of 15 seconds.
3. Turn the ignition on.
4. Using the scan tool, actuate the Evap Purge Solenoid to the ON position.
  NOTE:
  The vacuum should drop when the solenoid is actuated.
  
  Does the solenoid function as described above?
  
  Yes
  - Go To 8
  No
  - Verify that there is good pin to terminal contact in the Evap Purge Solenoid and Powertrain Control Module connectors. Replace the Evap Purge Solenoid if no problems were found with the connectors.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
    NOTE:
    Connect the vacuum hoses before continuing.
ENGINE MECHANICAL
1. Check for any of the following conditions/mechanical problems:
  - AIR INDUCTION SYSTEM - must be free from leaks
  - ENGINE VACUUM - must be at least 13 inches in neutral
  - ENGINE VALVE TIMING - must be within specifications
  - ENGINE COMPRESSION - must be within specifications
  - ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks
  - ENGINE PCV SYSTEM - must flow freely
  - TORQUE CONVERTER STALL SPEED - must be within specifications
  - POWER BRAKE BOOSTER - no internal vacuum leaks
  - FUEL - must be free of contamination
  - FUEL INJECTOR - plugged or restricted injector; control wire not connected to correct injector
  Are there any engine mechanical problems?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 12
O2 SENSOR 1/1

Fig 1: Checking Oxygen Sensor Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Ignition on, engine not running.
2. Disconnect the O2 Sensor 1/1 harness connector.
3. With the scan tool, monitor the O2 Sensor voltage.
4. O2 Sensor voltage should read between 4.1 and 5.0 volts on the scan tool with the connector disconnected.
5. Connect a jumper between the (K99) O2 Sensor 1/1 Signal circuit and the (K902) O2 Sensor 1/1 Return circuit in the O2 Sensor harness connector.
  NOTE:
  The voltage should drop from between 4.1 and 5.0 volts down to 2.5 volts with the jumper connected.
  
  Did the O2 Sensor voltage drop from between 4.1 and 5.0 volts to 2.5 volts when the jumper was installed?
  
  Yes
  - Verify that there is good pin to terminal contact in the O2 Sensor and Powertrain Control Module connectors. Replace the O2 Sensor if no problems were found with the connectors.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 10
    NOTE:
    Remove the jumper before continuing.
CHECK THE (K99) O2 SENSOR 1/1 SIGNAL CIRCUIT

Fig 2: Checking O2 Sensor Signal Circuit Voltage
Courtesy of CHRYSLER GROUP, LLC
1. Measure the voltage on the (K99) O2 Sensor 1/1 Signal circuit in the O2 Sensor harness connector.
  Is the voltage between 4.1 and 5.0 volts?
  
  Yes
  - Go To 11
  No
  - Check the (K99) O2 Sensor 1/1 Signal circuit for damage, short to ground, open or short to voltage. Inspect the O2 Sensor connector and the PCM harness connector. If OK, replace and program the Powertrain Control Module in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK THE (K902) O2 SENSOR 1/1 RETURN CIRCUIT

Fig 3: Checking O2 Sensor Return Circuit Voltage
Courtesy of CHRYSLER GROUP, LLC
1. Measure the voltage on the (K902) O2 Sensor 1/1 Return circuit in the 1/1 O2 Sensor harness connector.
  Is the voltage at 2.5 volts?
  
  Yes
  - Go To 12
  No
  - Check the (K902) O2 Sensor 1/1 Return circuit for damage, short to ground, open or short to voltage. Inspect the O2 Sensor connector and the PCM harness connector. If OK, replace and program the Powertrain Control Module in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
    NOTE:
    Turn the ignition off before continuing.
POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Sensors 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.
  - Verify that there is good pin to terminal contact in the O2 Sensor and Powertrain Control Module connectors.
  - Perform any Technical Service Bulletins that may apply.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replace and program the Powertrain Control Module in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .