Diagnostic Test

WARNING: This page is about a different car, the 2014 RAM 3500 HD and 2014 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
NOTE:
Diagnose and repair any Throttle Body circuit, system voltage or sensor supply voltage DTCs before continuing with this test.
1. Start the engine and allow it to reach 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 may result in possible serious or fatal injury.
2. With the scan tool, read the active DTCs.
  NOTE:
  If the DTC does not reset it may be necessary to test drive the vehicle.
  
  NOTE:
  If the P2122-APP Sensor 1 Circuit Low DTC is also Active, diagnose the P2122 before continuing with the P0122 diagnostic procedure.
  
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Go To 11
P0222 ALSO SET
Was the P0222-TPS 2 VOLTAGE LOW DTC set along with the P0122?

Yes
- Go To 3
No
- Go To 4
(F855) 5-VOLT SUPPLY CIRCUIT
1. Turn the ignition off.
2. Disconnect the Throttle Body harness connector.
3. Turn the ignition on.
4. Measure the voltage on the (F855) 5-Volt Supply circuit in the Throttle Body harness connector.
  Is the voltage between 4.8 to 5.2 Volts?
  
  Yes
  - Go To 4
  No
  - Go To 8
THROTTLE POSITION SENSOR
1. With the scan tool, monitor the TPS 1 voltage with the Sensor harness connector disconnected.
  NOTE:
  The sensor voltage should be approximately 5.0 Volts (plus or minus 0.1 of a volt) with the connector disconnected.
  
  Does the scan tool display the voltage as described above?
  
  Yes
  - Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors. If OK, replace the Throttle Body Assembly. Refer to THROTTLE BODY, REMOVAL . Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, using a scan tool select ETC RELEARN function.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 5
(K22) TPS 1 SIGNAL CIRCUIT SHORTED TO GROUND
1. Turn the ignition off.
2. Disconnect the C2 PCM harness connector.
3. Measure the resistance between ground and the (K22) TPS 1 Signal circuit in the Throttle Body harness connector.
  Is the resistance below 10k Ohms?
  
  Yes
  - Repair the short to ground in the (K22) TPS 1 Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 6
(K22) TPS 1 SIGNAL CIRCUIT SHORTED TO THE (K922) TPS RETURN CIRCUIT
1. Measure the resistance between the (K22) TPS 1 Signal circuit and the (K922) TPS Return circuit in the Throttle Body harness connector.
  Is the resistance below 100 Ohms?
  
  Yes
  - Repair the short between the (K922) TPS Return circuit and the (K22) TPS 1 Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 7
EXCESSIVE RESISTANCE IN THE (K22) TPS 1 SIGNAL CIRCUIT
1. Measure the resistance of the (K22) TPS 1 Signal circuit between the Throttle Body harness connector to the PCM C2 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 10
  No
  - Repair the excessive resistance in the (K22) TPS 1 Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
(F855) 5-VOLT SUPPLY CIRCUIT OPEN
1. Turn the ignition off.
2. Disconnect the PCM C2 harness connector.
3. Measure the resistance of the (F855) 5-Volt Supply circuit from the Throttle Body harness connector to the PCM C2 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 9
  No
  - Repair the open in the (F855) 5-Volt Supply circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
1. Measure the resistance between ground and the (F855) 5-Volt Supply circuit in the Throttle Body harness connector.
  Is the resistance below 100 Ohms?
  
  Yes
  - Repair the short to ground in the (F855) 5-Volt Supply circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 10
POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Throttle Body 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. Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors.
4. Perform any 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. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
THROTTLE FOLLOWER TEST
1. With the scan tool, perform the ETC Throttle Follower Test.
2. Monitor the TPS 1 voltage.
  Does the voltage start at approximately 0.7 of a Volt and increase to approximately 4.3 Volts with a smooth transition?
  
  Yes
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
  No
  - Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors. If OK, replace the Throttle Body Assembly. Refer to THROTTLE BODY, REMOVAL . Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, using a scan tool select ETC RELEARN function.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .