Diagnostic Test

WARNING: This page is about a different car, the 2013 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC
NOTE:
The throttle plate and linkage should be free from binding and carbon build up.

NOTE:
Make sure the throttle plate is at the idle position.
1. Ignition on, engine not running.
  NOTE:
  Inspect the engine for vacuum leaks.
2. With a scan tool, read the active DTCs.
  Is the DTC Active at this time?
  
  Yes
  - Go To 2
  No
  - Go To 7
CHECK FOR EXCESSIVE RESISTANCE IN THE (K22) TPS 1 SIGNAL CIRCUIT
1. Turn the ignition off.
2. Disconnect the PCM C2 harness connector.
  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 GPEC Diagnostic Adaptor to perform the diagnosis.
3. Connect the (special tool #10436, Adapter, GPEC Diagnostic) in line with the PCM C2 harness connector.
4. Using a Voltmeter perform a voltage drop test. Back probe the (K22) TPS 1 Signal circuit at the Throttle Body harness connector and the GPEC Adaptor. Make sure the Voltmeter leads are connected so a positive polarity is displayed on the Voltmeter.
  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.
5. Start the engine and allow it to reach normal operating temperature.
6. Monitor the Voltmeter.
  Is the voltage below 0.2 volts?
  
  Yes
  - Go To 3
  No
  - Repair the excessive resistance in the (K22) TPS 1 Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK FOR EXCESSIVE RESISTANCE IN THE (K922) TPS RETURN CIRCUIT
1. Turn the ignition off.
2. Move the Voltmeter leads to back probe the (K922) TPS Return circuit at the Throttle Body harness connector and the GPEC Adaptor. Make sure the Voltmeter leads are connected so a positive polarity is displayed on the Voltmeter.
  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.
3. Start the engine and allow it to reach normal operating temperature.
4. Monitor the Voltmeter.
  Is the voltage below 0.2 volts?
  
  Yes
  - Go To 4
  No
  - Repair the excessive resistance in the (K922) TPS Return circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK FOR EXCESSIVE RESISTANCE IN THE (K122) TPS 2 SIGNAL CIRCUIT
1. Turn the ignition off.
2. Move the Voltmeter leads to back probe the (K122) TPS 2 Signal circuit at the Throttle Body harness connector and probe the GPEC Adaptor. Make sure the Voltmeter leads are connected so a positive polarity is displayed on the Voltmeter.
  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.
3. Start the engine and allow it to reach normal operating temperature.
4. Monitor the Voltmeter.
  Is the voltage below 0.2 volts?
  
  Yes
  - Go To 5
  No
  - Repair the excessive resistance in the (K122) TPS 2 Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK FOR EXCESSIVE RESISTANCE IN THE (F855) 5-VOLT SUPPLY CIRCUIT
1. Turn the ignition off.
2. Using a Voltmeter perform a voltage drop test. Back probe the (F855) 5-Volt Supply circuit at the Throttle Body harness connector and probe the PCM C2 harness connector. Make sure the Voltmeter leads are connected so a positive polarity is displayed on the Voltmeter.
  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.
3. Start the engine and allow it to reach normal operating temperature.
4. Monitor the Voltmeter.
  Is the voltage below 0.2 volts?
  
  Yes
  - Go To 6
  No
  - Repair the excessive resistance in the (F855) 5-Volt Supply circuit
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
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 Technical Service Bulletins that may apply.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  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 STANDARD PROCEDURE .
THROTTLE FOLLOWER TEST
1. Ignition on, engine not running.
2. With a scan tool, perform the ETC Throttle Follower Test and monitor the TPS 1 and TPS 2 voltage.
3. Slowly press the throttle pedal down.
4. The voltage for TP Sensor No. 1 should start at approximately 0.7 volts and increase to approximately 4.3 volts.
5. The voltage for TP Sensor No. 2 should start at approximately 4.3 volts and decrease to approximately 0.7 volts.
  Is the voltage within the range of the listed specification for the appropriate Sensor?
  
  Yes
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to STANDARD PROCEDURE .
  No
  - Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors. If OK, disconnect the Battery when replacing the Throttle Body Assembly. Replace the Throttle Body Assembly. Refer to THROTTLE BODY, REMOVAL . After installation is complete, use a scan tool and select the ETC RELEARN function.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .