Diagnostic Test

WARNING: This page is about a different car, the 2010 Dodge Charger and 2010 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.

SRV PWM FEEDBACK
1. Start the engine and allow it to reach normal operating temperature.
  WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.
  
  NOTE: Diagnose and repair any system voltage or sensor supply voltage DTCs before continuing with this test.
2. With the scan tool, read the SRV PWM Feedback.
  Is the SRV PWM Feedback less than 3%?
  
  Yes
  - Go to step 2
  No
  - Perform the CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
SHORT RUNNER VALVE ASSEMBLY
1. Turn the ignition off.
2. Disconnect the Short Runner Valve Assembly connector.
3. Turn the ignition on.
4. With the scan tool, read the SRV PWM Feedback.
  NOTE: The SRV PWM Feedback should be greater than 97% with the connector disconnected.
  
  Is the SRV PWM Feedback greater than 97%?
  
  Yes
  - Replace the Short Runner Valve Assembly in accordance with the Service Information.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 3
(F856) 5-VOLT SUPPLY CIRCUIT VOLTAGE

Fig 1: Checking 5-Volt Supply Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition on.
2. Measure the voltage of the (F856) 5-Volt Supply circuit in the Short Runner Valve Assembly harness connector.
  Is the voltage above 4.5 volts?
  
  Yes
  - Go to step 7
  No
  - Go to step 4
(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

Fig 2: CHECKING 5-VOLT SUPPLY CIRCUIT FOR SHORT TO GROUND
Courtesy of CHRYSLER LLC
1. Turn the ignition on.
2. Disconnect the Powertrain Control Module (PCM) connector.
3. Measure the resistance between ground and the (F856) 5-Volt Supply circuit in the Short Runner Valve Assembly harness connector.
  Is the resistance above 100 ohms?
  
  Yes
  - Go to step 5
  No
  - Repair the (F856) 5-Volt Supply circuit for a short to ground.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO (K900) SENSOR GROUND CIRCUIT

Fig 3: CHECKING 5-VOLT SUPPLY CIRCUIT FOR SHORT TO SENSOR GROUND CIRCUIT
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (F856) 5-Volt Supply circuit and the (K900) Sensor Ground circuit in the Short Runner Valve Assembly harness connector.
  Is the resistance above 100 ohms?
  
  Yes
  - Go to step 6
  No
  - Repair the (F856) 5-Volt Supply circuit for a short to the (K900) Sensor Ground circuit.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(F856) 5-VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE

Fig 4: Checking 5-Volt Supply Circuit For Open Or Excessive Resistance
Courtesy of CHRYSLER LLC

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals, resulting in poor terminal to pin connection. Install the PCM Pinout Box 8815 to perform diagnosis.
1. Measure the resistance of the (F856) 5-Volt Supply circuit between the Short Runner Valve Assembly harness connector and the appropriate terminal of special tool #8815.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 11
  No
  - Repair the (F856) 5-Volt Supply circuit for an open circuit or high resistance.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K235) SRV SIGNAL CIRCUIT SHORTED TO GROUND

Fig 5: Checking SRV Signal Circuit For Short To Ground
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Powertrain Control Module (PCM) connector.
3. Measure the resistance between ground and the (K235) SRV Signal circuit in the Short Runner Valve Assembly harness connector.
  Is the resistance above 100 ohms?
  
  Yes
  - Go to step 8
  No
  - Repair the (K235) SRV Signal circuit for a short to ground.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K235) SRV SIGNAL CIRCUIT SHORTED TO (K900) SENSOR GROUND CIRCUIT

Fig 6: Checking SRV Signal Circuit For Short To Sensor Ground Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (K235) SRV Signal circuit and the (K900) Sensor Ground circuit in the Short Runner Valve Assembly harness connector.
  Is the resistance above 100 ohms?
  
  Yes
  - Go to step 9
  No
  - Repair the (K235) SRV Signal circuit for a short to the (K900) Sensor Ground circuit.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K235) SRV SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE

Fig 7: Checking SRV Signal Circuit For Open Or Excessive Resistance
Courtesy of CHRYSLER LLC

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals, resulting in poor terminal to pin connection. Install the PCM Pinout Box 8815 to perform diagnosis.
1. Measure the resistance of the (K235) SRV Signal circuit between the Short Runner Valve Assembly harness connector and the appropriate terminal of special tool #8815.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 10
  No
  - Repair the (K235) SRV Signal circuit for an open circuit or high resistance.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K900) SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE

Fig 8: Checking SRV Ground Circuit For Open Or Excessive Resistance
Courtesy of CHRYSLER LLC

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals, resulting in poor terminal to pin connection. Install the PCM Pinout Box 8815 to perform diagnosis.
1. Measure the resistance of the (K900) Sensor Ground circuit between the Short Runner Valve Assembly harness connector and the appropriate terminal of special tool #8815.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 11
  No
  - Repair the (K900) Sensor Ground circuit for an open circuit or high resistance.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Short Runner Valve Assembly and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals.
4. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
5. Look for the data to change or for the DTC to reset during the wiggle test.
6. Refer to any Technical Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .