Ram 1500, 2500, 3500, 2WD and 4WD, 2001-2005

What To Do When There Are No DTCs 3

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Symptom Diagnosis Tests



Test 4: Cuts-Out Or Misses Condition
Preliminary Checks

Prior to starting this symptom test routine, inspect these underhood items:

  1. All related vacuum lines for proper routing and integrity
  2.  
  3. Search for any technical service bulletins related to this symptom.
  4.  

Test 4 Chart

StepActionYesNo
1Step Description: Verify Cuts-out condition Start the engine and attempt to verify the Cuts-out or misses condition. Does the engine have a cuts-out condition-Check for any stored codes. If codes are set, repair codes and retest. If no codes are set, go to Step 3.Go to Step 2.
2Step Description: Condition does not exist! Inspect various underhood items that could cause an intermittent Cuts-out condition (i.e., EVAP, Fuel or Ignition system components). Were any problems located in this step-Correct the problems. Do a PCM reset and "Fuel Trim Relearn" procedure. Then verify condition is repaired.The problem is not present at this time. It may be an intermittent problem.
3Step Description: Check/compare PID values Connect a Scan Tool to the test connector. Turn off all accessories. Start the engine and allow it to fully warmup. Monitor all related PIDs on the Scan Tool (i.e., ECT IAC Counts and LONGFT at idle). Were all PIDs within their normal range-Go to Step 4. Note: The IAC motor should be from 5-50 counts. Watch fuel trim (%) for a large shift into the negative (-) range (due to a rich condition).One or more of the PIDs are out of range when compared to "known good" values. Make repairs to the system that is out of range, then retest for the symptom.

Test 4: Cuts Out or Misses Condition (Continued)

Test 4 Chart (Continued)

StepActionYesNo
4Step Description: Check the Ignition System Inspect the coils for signs of spark leakage at coil towers or primary connections. Check the spark output with a spark tester. Test Ignition system with an engine analyzer. Were any faults found in the Ignition system- Make repairs as needed Go to Step 5.
5Step Description: Check the Fuel System Inspect the Fuel delivery system for leaks. Test the fuel pressure, quality and volume. Test the operation of the pressure regulator. Were any faults found in the Fuel system- Make repairs as needed Go to Step 6.
6Step Description: Check the Exhaust System Check Exhaust system for leaks or damage. Check the Exhaust system for a restriction using the Vacuum or Pressure Gauge Test (e.g., exhaust backpressure reading should not exceed 1.5 psi at cruise speeds). Were any faults found in Exhaust System- Make repairs to the Exhaust system. Then retest the symptom. Go to Step 7.
7Step Description: Check the PCV System Inspect the PCV system components for broken parts or loose connections. Test the operation of the PCV valve. Were any faults found in the PCV system-Make repairs to the PCV system. Refer to the PCV system tests. Then retest for the condition.Go to Step 8.
8Step Description: Check the EVAP System Inspect for damaged or disconnected EVAP system components Check for a saturated EVAP canister. Were any faults found in the EVAP system-Make repairs to EVAP system (use the EVAP tests in this manual). Retest for the condition.Go to Step 9.
9Step Description: Check the AIR system Inspect AIR system for broken parts, leaking valves or disconnected hoses (see graphic). Test the operation of Secondary AIR system. Were any faults found in the AIR system-Make repairs as needed. Refer to the Secondary AIR system tests. Retest for the condition.Go to Step 10.
10Step Description: Check Engine Condition Test the engine compression. Test valve timing and timing chain condition. Check for a worn camshaft or valve train. Check for any large intake manifold leaks. Were any faults found in the Base Engine-Make repairs as needed to the Base Engine. Refer to the Base Engine tests. Then retest for the condition when repairs are completed.Go to Step 2 and repeat the tests from the beginning to locate and repair the cause of the "Cuts Out or Misses" condition.

Typical Secondary Air System Graphic

Click image to see an enlarged view

Fig.

Prior to starting this symptom test routine, inspect these underhood items:

  1. All related vacuum lines for proper routing and integrity
  2.  
  3. Search for any technical service bulletins related to this symptom.
  4.  

Test 4 Chart

StepActionYesNo
1Step Description: Verify Cuts-out condition Start the engine and attempt to verify the Cuts-out or misses condition. Does the engine have a cuts-out condition-Check for any stored codes. If codes are set, repair codes and retest. If no codes are set, go to Step 3.Go to Step 2.
2Step Description: Condition does not exist! Inspect various underhood items that could cause an intermittent Cuts-out condition (i.e., EVAP, Fuel or Ignition system components). Were any problems located in this step-Correct the problems. Do a PCM reset and "Fuel Trim Relearn" procedure. Then verify condition is repaired.The problem is not present at this time. It may be an intermittent problem.
3Step Description: Check/compare PID values Connect a Scan Tool to the test connector. Turn off all accessories. Start the engine and allow it to fully warmup. Monitor all related PIDs on the Scan Tool (i.e., ECT IAC Counts and LONGFT at idle). Were all PIDs within their normal range-Go to Step 4. Note: The IAC motor should be from 5-50 counts. Watch fuel trim (%) for a large shift into the negative (-) range (due to a rich condition).One or more of the PIDs are out of range when compared to "known good" values. Make repairs to the system that is out of range, then retest for the symptom.

Test 4: Cuts Out or Misses Condition (Continued)

Test 4 Chart (Continued)

StepActionYesNo
4Step Description: Check the Ignition System Inspect the coils for signs of spark leakage at coil towers or primary connections. Check the spark output with a spark tester. Test Ignition system with an engine analyzer. Were any faults found in the Ignition system- Make repairs as needed Go to Step 5.
5Step Description: Check the Fuel System Inspect the Fuel delivery system for leaks. Test the fuel pressure, quality and volume. Test the operation of the pressure regulator. Were any faults found in the Fuel system- Make repairs as needed Go to Step 6.
6Step Description: Check the Exhaust System Check Exhaust system for leaks or damage. Check the Exhaust system for a restriction using the Vacuum or Pressure Gauge Test (e.g., exhaust backpressure reading should not exceed 1.5 psi at cruise speeds). Were any faults found in Exhaust System- Make repairs to the Exhaust system. Then retest the symptom. Go to Step 7.
7Step Description: Check the PCV System Inspect the PCV system components for broken parts or loose connections. Test the operation of the PCV valve. Were any faults found in the PCV system-Make repairs to the PCV system. Refer to the PCV system tests. Then retest for the condition.Go to Step 8.
8Step Description: Check the EVAP System Inspect for damaged or disconnected EVAP system components Check for a saturated EVAP canister. Were any faults found in the EVAP system-Make repairs to EVAP system (use the EVAP tests in this manual). Retest for the condition.Go to Step 9.
9Step Description: Check the AIR system Inspect AIR system for broken parts, leaking valves or disconnected hoses (see graphic). Test the operation of Secondary AIR system. Were any faults found in the AIR system-Make repairs as needed. Refer to the Secondary AIR system tests. Retest for the condition.Go to Step 10.
10Step Description: Check Engine Condition Test the engine compression. Test valve timing and timing chain condition. Check for a worn camshaft or valve train. Check for any large intake manifold leaks. Were any faults found in the Base Engine-Make repairs as needed to the Base Engine. Refer to the Base Engine tests. Then retest for the condition when repairs are completed.Go to Step 2 and repeat the tests from the beginning to locate and repair the cause of the "Cuts Out or Misses" condition.

Typical Secondary Air System Graphic

Click image to see an enlarged view

Fig.

Test 5: Surge Condition
Preliminary Checks
  1. Discuss how the operation of the torque converter clutch (TCC) or air conditioning compressor can affect the "feel" of the vehicle during normal operation.
  2.  
  3. Search for any technical service bulletins related to this symptom.
  4.  

Test 5 Chart

StepActionYesNo
1Step Description: Verify the surge condition Drive the vehicle and attempt to verify that the vehicle surges at cruise speeds. Does the engine have a surge condition-Check for any stored codes. If codes are set, repair codes and retest. If no codes are set, go to Step 3.Go to Step 2.
2Step Description: Condition does not exist! Inspect various underhood items that could cause an intermittent surge condition (check for leaks in the MAP sensor vacuum lines). Were any problems located in this step-Correct the problems. Do a PCM reset and "Fuel Trim Relearn" procedure. Then verify condition is repaired.The problem is not present at this time. It may be an intermittent problem.
3Step Description: Check/compare PID values Connect a Scan Tool to the test connector. Start the engine and allow it to fully warmup. Monitor all related PIDs on Scan Tool (HO2S switching, LONGFT, and the TCC operation) Compare VSS PID reading to speedometer. Were all PIDs within their normal range-Go to Step 4. Note: Verify that the front HO2S responds quickly to throttle changes. Check for silicon contamination on the front HO2S (this can cause a rich A/F signal).One or more of the PIDs are out of range when compared to "known good" values. Make repairs to the system that is out of range, then retest for the symptom.

Test 5: Surge Condition (Continued)

Test 5 Chart (Continued)

StepActionYesNo
4Step Description: Check the Ignition System Inspect the coils for signs of spark leakage at coil towers or primary connections. Check the spark output with a spark tester. Test Ignition system with an engine analyzer. Were any faults found in the Ignition system- Make repairs as needed Go to Step 5.
5Step Description: Check the Fuel System Inspect the Fuel delivery system for leaks. Test the fuel pressure, quality and volume. Test the operation of the pressure regulator. Were any faults found in the Fuel system- Make repairs as needed Go to Step 6.
6Step Description: Check the Exhaust System Check Exhaust system for leaks or damage. Check the Exhaust system for a restriction using the Vacuum or Pressure Gauge Test (e.g., exhaust backpressure reading should not exceed 1.5 psi at cruise speeds). Were any faults found in Exhaust System- Make repairs to the Exhaust system. Then retest the symptom. Return to Step 2 and repeat the tests from the beginning to locate and repair the cause of the "Surge" condition.
  1. Discuss how the operation of the torque converter clutch (TCC) or air conditioning compressor can affect the "feel" of the vehicle during normal operation.
  2.  
  3. Search for any technical service bulletins related to this symptom.
  4.  

Test 5 Chart

StepActionYesNo
1Step Description: Verify the surge condition Drive the vehicle and attempt to verify that the vehicle surges at cruise speeds. Does the engine have a surge condition-Check for any stored codes. If codes are set, repair codes and retest. If no codes are set, go to Step 3.Go to Step 2.
2Step Description: Condition does not exist! Inspect various underhood items that could cause an intermittent surge condition (check for leaks in the MAP sensor vacuum lines). Were any problems located in this step-Correct the problems. Do a PCM reset and "Fuel Trim Relearn" procedure. Then verify condition is repaired.The problem is not present at this time. It may be an intermittent problem.
3Step Description: Check/compare PID values Connect a Scan Tool to the test connector. Start the engine and allow it to fully warmup. Monitor all related PIDs on Scan Tool (HO2S switching, LONGFT, and the TCC operation) Compare VSS PID reading to speedometer. Were all PIDs within their normal range-Go to Step 4. Note: Verify that the front HO2S responds quickly to throttle changes. Check for silicon contamination on the front HO2S (this can cause a rich A/F signal).One or more of the PIDs are out of range when compared to "known good" values. Make repairs to the system that is out of range, then retest for the symptom.

Test 5: Surge Condition (Continued)

Test 5 Chart (Continued)

StepActionYesNo
4Step Description: Check the Ignition System Inspect the coils for signs of spark leakage at coil towers or primary connections. Check the spark output with a spark tester. Test Ignition system with an engine analyzer. Were any faults found in the Ignition system- Make repairs as needed Go to Step 5.
5Step Description: Check the Fuel System Inspect the Fuel delivery system for leaks. Test the fuel pressure, quality and volume. Test the operation of the pressure regulator. Were any faults found in the Fuel system- Make repairs as needed Go to Step 6.
6Step Description: Check the Exhaust System Check Exhaust system for leaks or damage. Check the Exhaust system for a restriction using the Vacuum or Pressure Gauge Test (e.g., exhaust backpressure reading should not exceed 1.5 psi at cruise speeds). Were any faults found in Exhaust System- Make repairs to the Exhaust system. Then retest the symptom. Return to Step 2 and repeat the tests from the beginning to locate and repair the cause of the "Surge" condition.
 
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