Diagnostic Test

WARNING: This page is about a different car, the 2015 Fiat 500. However, it is still accessible from the selected car via links, so may be relevant.

CHECK THE ENGINE OIL
NOTE:
An active SKIM code can cause this DTC to set. This may happen because the PCM will turn off the actuation of the VVA Actuators, but is still monitoring the parameters of the VVA high oil pressure absent monitor. Diagnose any SKIM Module DTCs that are present before continuing with this test procedure.

NOTE:
Diagnose and repair any ASD Main Relay or Actuator Supply voltage DTCs before continuing with this test procedure. The PCM internal actuator supply voltage is powered by the ASD Relay output supply to the PCM.

NOTE:
This code may not set if engine is warm, recommend allowing vehicle to sit for a cold soak.

NOTE:
Engine must be cranked for approximately 10 seconds to set DTC.
1. Check the engine for the following:
  - LOW ENGINE OIL
  - INCORRECT OIL FILTER THAT DOES NOT MEET OEM SPECIFICATIONS
  - OIL DIRTY OR DETERIORATED (Lack of scheduled oil changes)
  - CORRECT VISCOSITY AND WEIGHT
  - ENGINE OIL CONTAMINATED (i.e., coolant and/or fuel)
  Is oil level, type, and condition correct?
  
  Yes
  - Go To 2
  No
  - Correct level/change engine oil and filter as required, consult the service information for correct type and grade of engine oil and repeat test.
CHECK OIL PRESSURE / ENGINE MECHANICAL
NOTE:
The actuators will not operate if the oil pressure is too low or too high.
1. Remove the Oil Pressure Switch and install a mechanical oil pressure gauge. Refer to ENGINE LUBRICATION DIAGNOSTIC TABLE .
2. Crank the engine for at least 10 seconds and check the oil pressure at the Oil Pressure Switch location.
  Is the oil pressure between 0.8 bar (11.6 psi) and 7.5 bar (108.8 psi)?
  
  Yes
  - Go To 3
  No
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
ENGINE MECHANICAL
1. Perform a cylinder leak down test. Refer to CYLINDER LEAKAGE TEST .
  Were any leaks found during the cylinder leak down test?
  
  Yes
  - Inspect for a broken timing belt and/or bent or broken valves. Perform the appropriate repair.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 4
CHECK THE MULTI AIR OIL SUPPLY SCREEN
1. Remove the Multiair Actuator Oil Supply Filter screen and visually inspect for contamination or damage. Refer to FILTER, MULTIAIR ACTUATOR OIL SUPPLY, REMOVAL .
  Was the screen damaged or plugged/restricted?
  
  Yes
  - Replace filter screen and test operation. Investigate for source of contamination.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 5
CHECK THE MULTI AIR OIL PRESSURE
1. Install a mechanical oil pressure gauge to the oil supply filter screen port.
2. Crank the engine for at least 10 seconds and measure the oil pressure.
  Is oil the pressure between 0.6 bar (8.7 psi) and 7.5 bar (108.8 psi)?
  
  Yes
  - Go To 6
  No
  - Repair the cause of the lack of or excess oil pressure to the VVA Assembly.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK THE PCM SUPPLY VOLTAGE TO THE VVA SOLENOIDS
1. Turn the ignition off.
2. Disconnect one of the VVA Solenoid harness connectors.
3. Using a 12-volt test light connected to ground, probe the solenoid Control circuit of the VVA Solenoid.
4. Crank the engine.
  Does the test light illuminate brightly when the engine is cranked?
  
  Yes
  - Replace the Variable Valve Actuation Assembly. Refer to ASSEMBLY, VARIABLE VALVE ACTUATION, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To
    Refer to 7.
CHECK THE ASD RELAY OUTPUT CIRCUIT AT THE PCM
NOTE:
The PCM internal actuator supply voltage, which is the power supply source for the VVA Solenoids is powered by the ASD Relay output supply to the PCM.
1. Turn the ignition on.
2. With the scan tool, actuate the ASD Relay on.
3. Using the wiring diagram as a guide, measure the voltage at each of the ASD Relay Output circuit inputs to the PCM.
  Is voltage present on the ASD Relay output circuits at the PCM?
  
  Yes
  - Replace the Variable Valve Actuation Assembly. Refer to ASSEMBLY, VARIABLE VALVE ACTUATION, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Refer to 8.
POWERTRAIN CONTROL MODULE (PCM)
1. Perform any Technical Service Bulletins that may apply.
  Were any TSBs 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. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .