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Engine Controls - Trouble Shooting - No Codes - Cng & Gasoline: Other Dodge Pickup R2500

Testing & Diagnostics ~2115 words

ENGINE DOES NOT CRANK

If engine does not crank, check starter circuits. See appropriate STARTERS article in ELECTRICAL.

ENGINE DOES NOT START

If engine cranks but does not start or engine does not start and scan tool displays no response, perform appropriate test. See NO-START DIAGNOSIS in BASIC DIAGNOSTIC PROCEDURES - RAM PICKUP & RAM VAN - GASOLINE article or NO-START DIAGNOSIS in BASIC DIAGNOSTIC PROCEDURES - RAM VAN - CNG article.

HARD START

Check listed items in order as follows

  1. Check fuel pressure. On CNG models, see «FUEL PRESSURE TEST»(ref-157918-S02364851182003090200000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - RAM VAN - CNG article. On gasoline models, see «FUEL PUMP PRESSURE TEST»(ref-157772-S08775417632003082600000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - RAM PICKUP & RAM VAN - GASOLINE article.
  2. Check Engine Coolant Temperature (ECT) sensor. On CNG models, see «ENGINE COOLANT TEMPERATURE SENSOR»(ref-157930-S33167153782003090300000) under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM VAN - CNG article. On gasoline models, see «ENGINE COOLANT TEMPERATURE SENSOR»(ref-157773-S23774974042003082600000) under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.
  3. Check Throttle Position (TP) sensor. On CNG models, see «THROTTLE POSITION SENSOR»(ref-157930-S24329884512003090300000) SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM VAN - CNG article. On gasoline models, see «THROTTLE POSITION SENSOR»(ref-157773-S10601103702003082600000) under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.
  4. Check Manifold Absolute Pressure (MAP) sensor. On CNG models, see «MANIFOLD ABSOLUTE PRESSURE SENSOR»(ref-157930-S35632053172003090300000) under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM VAN - CNG article. On gasoline models, see «MANIFOLD ABSOLUTE PRESSURE SENSOR»(ref-157773-S12669436992003082600000) under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.
  5. Check minimum idle airflow. On CNG models, see «MINIMUM IDLE AIRFLOW»(ref-157930-S20928985152003090300000) under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - RAM VAN - CNG article. On gasoline models, see «MINIMUM IDLE AIRFLOW»(ref-157773-S22971304582003082600000) under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.
  6. Check Idle Air Control (IAC) motor operation. On CNG models, see «DTC P0505: IDLE AIR CONTROL MOTOR CIRCUITS»(ref-157603-S29109509142003081900000) under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - RAM VAN article. On gasoline models, see «IDLE AIR CONTROL MOTOR»(ref-157773-S39853974042003082600000) under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.
  7. On gasoline models, check EVAP emission system. See «FUEL EVAPORATIVE SYSTEM»(ref-157773-S08692560012003082600000) under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.
  8. Check Intake Air Temperature (IAT) sensor. On CNG models, see «INTAKE AIR TEMPERATURE SENSOR»(ref-157930-S10240817032003090300000) under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM VAN - CNG article. On gasoline models, see «INTAKE AIR TEMPERATURE SENSOR»(ref-157773-S02753618392003082600000) under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.

ENGINE STALLS IN GEAR

Note. Check for proper Torque Converter Clutch (TCC) operation. See appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS.

HESITATION/STUMBLE

Check listed items in order as follows

  1. Check Powertrain Control Module (PCM) power and ground circuits. On CNG models, see «POWERTRAIN CONTROL MODULE»(ref-157930-S07604412852003090300000) under COMPUTERIZED ENGINE CONTROLS in SYSTEM & COMPONENT TESTING - RAM VAN - CNG article. On gasoline models, see «POWERTRAIN CONTROL MODULE»(ref-157773-S04071821742003082600000) under COMPUTERIZED ENGINE CONTROLS in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.
  2. Check fuel pressure. On CNG models, see «FUEL PRESSURE TEST»(ref-157918-S02364851182003090200000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - RAM VAN - CNG article. On gasoline models, see «FUEL PUMP PRESSURE TEST»(ref-157772-S08775417632003082600000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - RAM PICKUP & RAM VAN - GASOLINE article.
  3. Check Engine Coolant Temperature (ECT) sensor. On CNG models, see «ENGINE COOLANT TEMPERATURE SENSOR»(ref-157930-S33167153782003090300000) under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM VAN - CNG article. On gasoline models, see «ENGINE COOLANT TEMPERATURE SENSOR»(ref-157773-S23774974042003082600000) under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.
  4. Check Throttle Position (TP) sensor. On CNG models, see «THROTTLE POSITION SENSOR»(ref-157930-S24329884512003090300000) SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM VAN - CNG article. On gasoline models, see «THROTTLE POSITION SENSOR»(ref-157773-S10601103702003082600000) under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.
  5. Check Manifold Absolute Pressure (MAP) sensor. On CNG models, see «MANIFOLD ABSOLUTE PRESSURE SENSOR»(ref-157930-S35632053172003090300000) under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM VAN - CNG article. On gasoline models, see «MANIFOLD ABSOLUTE PRESSURE SENSOR»(ref-157773-S12669436992003082600000) under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.
  6. Check minimum idle airflow. On CNG models, see «MINIMUM IDLE AIRFLOW»(ref-157930-S20928985152003090300000) under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - RAM VAN - CNG article. On gasoline models, see «MINIMUM IDLE AIRFLOW»(ref-157773-S22971304582003082600000) under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.
  7. Check Idle Air Control (IAC) motor operation. On CNG models, see «DTC P0505: IDLE AIR CONTROL MOTOR CIRCUITS»(ref-157603-S29109509142003081900000) under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - RAM VAN article. On gasoline models, see «IDLE AIR CONTROL MOTOR»(ref-157773-S39853974042003082600000) under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.
  8. On gasoline models, check EVAP emission system. See «FUEL EVAPORATIVE SYSTEM»(ref-157773-S08692560012003082600000) under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.

SURGE

Check listed items in order as follows

  1. Check Powertrain Control Module (PCM) power and ground circuits. On CNG models, see «POWERTRAIN CONTROL MODULE»(ref-157930-S07604412852003090300000) under COMPUTERIZED ENGINE CONTROLS in SYSTEM & COMPONENT TESTING - RAM VAN - CNG article. On gasoline models, see «POWERTRAIN CONTROL MODULE»(ref-157773-S04071821742003082600000) under COMPUTERIZED ENGINE CONTROLS in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.
  2. Check fuel pressure. On CNG models, see «FUEL PRESSURE TEST»(ref-157918-S02364851182003090200000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - RAM VAN - CNG article. On gasoline models, see «FUEL PUMP PRESSURE TEST»(ref-157772-S08775417632003082600000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - RAM PICKUP & RAM VAN - GASOLINE article.
  3. Check Engine Coolant Temperature (ECT) sensor. On CNG models, see «ENGINE COOLANT TEMPERATURE SENSOR»(ref-157930-S33167153782003090300000) under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM VAN - CNG article. On gasoline models, see «ENGINE COOLANT TEMPERATURE SENSOR»(ref-157773-S23774974042003082600000) under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.
  4. Check Throttle Position (TP) sensor calibration. On CNG models, see «THROTTLE POSITION SENSOR»(ref-157930-S24329884512003090300000) SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM VAN - CNG article. On gasoline models, see «THROTTLE POSITION SENSOR»(ref-157773-S10601103702003082600000) under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.
  5. Check Manifold Absolute Pressure (MAP) sensor. On CNG models, see «MANIFOLD ABSOLUTE PRESSURE SENSOR»(ref-157930-S35632053172003090300000) under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM VAN - CNG article. On gasoline models, see «MANIFOLD ABSOLUTE PRESSURE SENSOR»(ref-157773-S12669436992003082600000) under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.
  6. Check minimum idle airflow. On CNG models, see «MINIMUM IDLE AIRFLOW»(ref-157930-S20928985152003090300000) under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - RAM VAN - CNG article. On gasoline models, see «MINIMUM IDLE AIRFLOW»(ref-157773-S22971304582003082600000) under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.
  7. Check Idle Air Control (IAC) motor operation. On CNG models, see «DTC P0505: IDLE AIR CONTROL MOTOR CIRCUITS»(ref-157603-S29109509142003081900000) under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - RAM VAN article. On gasoline models, see «IDLE AIR CONTROL MOTOR»(ref-157773-S39853974042003082600000) under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.
  8. On gasoline models, check EVAP emission system. See «FUEL EVAPORATIVE SYSTEM»(ref-157773-S08692560012003082600000) under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.

LACK OF POWER/SLUGGISH

Check listed items in order as follows

  1. Check Powertrain Control Module (PCM) power and ground circuits. On CNG models, see «POWERTRAIN CONTROL MODULE»(ref-157930-S07604412852003090300000) under COMPUTERIZED ENGINE CONTROLS in SYSTEM & COMPONENT TESTING - RAM VAN - CNG article. On gasoline models, see «POWERTRAIN CONTROL MODULE»(ref-157773-S04071821742003082600000) under COMPUTERIZED ENGINE CONTROLS in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.
  2. Check fuel pressure. On CNG models, see «FUEL PRESSURE TEST»(ref-157918-S02364851182003090200000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - RAM VAN - CNG article. On gasoline models, see «FUEL PUMP PRESSURE TEST»(ref-157772-S08775417632003082600000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - RAM PICKUP & RAM VAN - GASOLINE article.
  3. Check Engine Coolant Temperature (ECT) sensor. On CNG models, see «ENGINE COOLANT TEMPERATURE SENSOR»(ref-157930-S33167153782003090300000) under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM VAN - CNG article. On gasoline models, see «ENGINE COOLANT TEMPERATURE SENSOR»(ref-157773-S23774974042003082600000) under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.
  4. Check Throttle Position (TP) sensor. On CNG models, see «THROTTLE POSITION SENSOR»(ref-157930-S24329884512003090300000) SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM VAN - CNG article. On gasoline models, see «THROTTLE POSITION SENSOR»(ref-157773-S10601103702003082600000) under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.
  5. Check Manifold Absolute Pressure (MAP) sensor. On CNG models, see «MANIFOLD ABSOLUTE PRESSURE SENSOR»(ref-157930-S35632053172003090300000) under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM VAN - CNG article. On gasoline models, see «MANIFOLD ABSOLUTE PRESSURE SENSOR»(ref-157773-S12669436992003082600000) under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.
  6. Check Idle Air Control (IAC) motor operation. On CNG models, see «DTC P0505: IDLE AIR CONTROL MOTOR CIRCUITS»(ref-157603-S29109509142003081900000) under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - RAM VAN article. On gasoline models, see «IDLE AIR CONTROL MOTOR»(ref-157773-S39853974042003082600000) under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.

POOR FUEL ECONOMY

Check listed items in order as follows

  1. Check Powertrain Control Module (PCM) power and ground circuits. On CNG models, see «POWERTRAIN CONTROL MODULE»(ref-157930-S07604412852003090300000) under COMPUTERIZED ENGINE CONTROLS in SYSTEM & COMPONENT TESTING - RAM VAN - CNG article. On gasoline models, see «POWERTRAIN CONTROL MODULE»(ref-157773-S04071821742003082600000) under COMPUTERIZED ENGINE CONTROLS in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.
  2. Check fuel pressure. On CNG models, see «FUEL PRESSURE TEST»(ref-157918-S02364851182003090200000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - RAM VAN - CNG article. On gasoline models, see «FUEL PUMP PRESSURE TEST»(ref-157772-S08775417632003082600000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - RAM PICKUP & RAM VAN - GASOLINE article.
  3. Check Engine Coolant Temperature (ECT) sensor. On CNG models, see «ENGINE COOLANT TEMPERATURE SENSOR»(ref-157930-S33167153782003090300000) under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM VAN - CNG article. On gasoline models, see «ENGINE COOLANT TEMPERATURE SENSOR»(ref-157773-S23774974042003082600000) under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.
  4. Check Throttle Position (TP) sensor. On CNG models, see «THROTTLE POSITION SENSOR»(ref-157930-S24329884512003090300000) SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM VAN - CNG article. On gasoline models, see «THROTTLE POSITION SENSOR»(ref-157773-S10601103702003082600000) under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.
  5. Check minimum idle airflow. On CNG models, see «MINIMUM IDLE AIRFLOW»(ref-157930-S20928985152003090300000) under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - RAM VAN - CNG article. On gasoline models, see «MINIMUM IDLE AIRFLOW»(ref-157773-S22971304582003082600000) under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.
  6. Check Idle Air Control (IAC) motor operation. On CNG models, see «DTC P0505: IDLE AIR CONTROL MOTOR CIRCUITS»(ref-157603-S29109509142003081900000) under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - RAM VAN article. On gasoline models, see «IDLE AIR CONTROL MOTOR»(ref-157773-S39853974042003082600000) under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.
  7. On gasoline models, check EVAP emission system. See «FUEL EVAPORATIVE SYSTEM»(ref-157773-S08692560012003082600000) under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.
  8. Check Intake Air Temperature (IAT) sensor. On CNG models, see «INTAKE AIR TEMPERATURE SENSOR»(ref-157930-S10240817032003090300000) under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM VAN - CNG article. On gasoline models, see «INTAKE AIR TEMPERATURE SENSOR»(ref-157773-S02753618392003082600000) under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - RAM PICKUP & RAM VAN - GASOLINE article.

Intermittent Simulation

To reproduce the conditions creating an intermittent fault, use the following methods

  1. Lightly vibrate component.
  2. Heat component.
  3. Wiggle or bend wiring harness.
  4. Spray component with water.
  5. Remove/apply vacuum source.

Monitor circuit/component voltage or resistance while simulating intermittent. If engine is running, monitor for DTCs. Use test results to identify a faulty component or circuit.

More articles — Engine Controls - Trouble Shooting - No Codes - Cng & Gasoline