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Engine Controls - Trouble Shooting - No Codes Chrysler Town & Country IV

Testing & Diagnostics ~2310 words

INTRODUCTION

Before diagnosing symptoms or intermittent faults, follow proper workflow. See DIAGNOSTIC PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - CARAVAN, TOWN & COUNTRY, & VOYAGER article. If no Diagnostic Trouble Codes (DTC) are present and a no-start condition exists, proceed to BASIC DIAGNOSTIC PROCEDURES - CARAVAN, TOWN & COUNTRY, & VOYAGER article. If no DTCs are present and a driveability condition exists, diagnosis by symptom (i.e., ROUGH IDLE, ENGINE STALLS, etc.).

Symptom checks direct technician to malfunctioning component(s) for further diagnosis. A symptom should lead to a specific component, system test or an adjustment.

Use intermittent test procedures to locate driveability problems that do not occur when the vehicle is being tested. These test procedures should also be used if a DTC code is present, but no problem is found during self-diagnostic testing.

Note. For specific testing procedures, see SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article. For specifications, see appropriate ON-VEHICLE ADJUSTMENTS or appropriate SERVICE & ADJUSTMENT SPECIFICATIONS article.

PRELIMINARY INSPECTION

Most engine control system driveability problems result from faulty wiring, poor electrical connections, improper wire routing, or leaking air and vacuum hose connections. Inspect all engine control system components, hoses, connectors and wiring for damage before proceeding with symptom diagnosis.

SYMPTOM DIAGNOSIS

Symptom checks cannot be used properly unless problem occurs while vehicle is being tested. To reduce diagnostic time, ensure steps in BASIC DIAGNOSTIC PROCEDURES - CARAVAN, TOWN & COUNTRY, & VOYAGER article and SELF-DIAGNOSTICS - CARAVAN, TOWN & COUNTRY, & VOYAGER article were performed before diagnosing a symptom. Symptoms available for diagnosis are as follows

  1. «ENGINE DOES NOT CRANK»(/chrysler/town-country/iv-2000-2005/remont/testing-diagnostics/#engine-controls-trouble-shooting-no-codes__engine-does-not-crank)
  2. «ENGINE DOES NOT START»(/chrysler/town-country/iv-2000-2005/remont/testing-diagnostics/#engine-controls-trouble-shooting-no-codes__engine-does-not-start)
  3. «HARD START»(/chrysler/town-country/iv-2000-2005/remont/testing-diagnostics/#engine-controls-trouble-shooting-no-codes__hard-start)
  4. «STARTS & STALLS»(/chrysler/town-country/iv-2000-2005/remont/testing-diagnostics/#engine-controls-trouble-shooting-no-codes__starts-stalls)
  5. «HESITATION/STUMBLE»(/chrysler/town-country/iv-2000-2005/remont/testing-diagnostics/#engine-controls-trouble-shooting-no-codes__hesitationstumble)
  6. «SURGE»(/chrysler/town-country/iv-2000-2005/remont/testing-diagnostics/#engine-controls-trouble-shooting-no-codes__surge)
  7. «LACK OF POWER/SLUGGISH»(/chrysler/town-country/iv-2000-2005/remont/testing-diagnostics/#engine-controls-trouble-shooting-no-codes__lack-of-powersluggish)
  8. «SPARK KNOCK/DETONATION»(/chrysler/town-country/iv-2000-2005/remont/testing-diagnostics/#engine-controls-trouble-shooting-no-codes__spark-knockdetonation)
  9. «CUTS OUT/MISSES»(/chrysler/town-country/iv-2000-2005/remont/testing-diagnostics/#engine-controls-trouble-shooting-no-codes__cuts-outmisses)
  10. «BACKFIRE»(/chrysler/town-country/iv-2000-2005/remont/testing-diagnostics/#engine-controls-trouble-shooting-no-codes__backfire)
  11. «RUNS ROUGH/UNSTABLE, ERRATIC IDLE»(/chrysler/town-country/iv-2000-2005/remont/testing-diagnostics/#engine-controls-trouble-shooting-no-codes__runs-roughunstable-erratic-idle)
  12. «POOR FUEL ECONOMY»(/chrysler/town-country/iv-2000-2005/remont/testing-diagnostics/#engine-controls-trouble-shooting-no-codes__poor-fuel-economy)

ENGINE DOES NOT CRANK

If engine does not crank, check starter circuits. See NO CRANK CONDITION under NO-START DIAGNOSIS in BASIC DIAGNOSTIC PROCEDURES - CARAVAN, TOWN & COUNTRY, & VOYAGER article.

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 - CARAVAN, TOWN & COUNTRY, & VOYAGER article.

HARD START

Check listed items as follows

  1. Check engine vacuum. See CHECKING ENGINE VACUUM under PRELIMINARY INSPECTION & ADJUSTMENTS in BASIC DIAGNOSTIC PROCEDURES - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  2. Check fuel pressure. See CHECKING FUEL DELIVERY under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  3. Check engine coolant temperature sensor. See ENGINE COOLANT TEMPERATURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  4. Check throttle position sensor. See THROTTLE POSITION SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  5. Check manifold absolute pressure sensor. See MANIFOLD ABSOLUTE PRESSURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  6. Check idle air control motor operation. See IDLE AIR CONTROL MOTOR under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  7. Check EGR system. See EXHAUST GAS RECIRCULATION SYSTEM under EMISSION SYSTEMS & SUBSYSTEMS in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  8. Check inlet air temperature sensor. See INLET AIR TEMPERATURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.

STARTS & STALLS

Check listed items as follows

  1. Check powertrain control module power and ground circuits. See POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  2. Check fuel pressure. See CHECKING FUEL DELIVERY under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  3. Check engine coolant temperature sensor. See ENGINE COOLANT TEMPERATURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  4. Check throttle position sensor. See THROTTLE POSITION SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  5. Check manifold absolute pressure sensor. See MANIFOLD ABSOLUTE PRESSURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  6. Check idle air control motor operation. See IDLE AIR CONTROL MOTOR under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.

HESITATION/STUMBLE

Check listed items as follows

  1. Check powertrain control module power and ground circuits. See POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  2. Check engine vacuum. See CHECKING ENGINE VACUUM under PRELIMINARY INSPECTION & ADJUSTMENTS in BASIC DIAGNOSTIC PROCEDURES - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  3. Check fuel pressure. See CHECKING FUEL DELIVERY under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  4. Check engine coolant temperature sensor. See ENGINE COOLANT TEMPERATURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  5. Check throttle position sensor. See THROTTLE POSITION SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  6. Check manifold absolute pressure sensor. See MANIFOLD ABSOLUTE PRESSURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.

SURGE

Check listed items as follows

  1. Check idle air control motor operation. See IDLE AIR CONTROL MOTOR under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  2. Check inlet air temperature sensor. See INLET AIR TEMPERATURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  3. Check powertrain control module power and ground circuits. See POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  4. Check fuel pressure. See CHECKING FUEL DELIVERY under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  5. Check engine coolant temperature sensor. See ENGINE COOLANT TEMPERATURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  6. Check throttle position sensor. See THROTTLE POSITION SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  7. Check manifold absolute pressure sensor. See MANIFOLD ABSOLUTE PRESSURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  8. Check idle air control motor operation. See IDLE AIR CONTROL MOTOR under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.

LACK OF POWER/SLUGGISH

Check listed items as follows

  1. Check powertrain control module power and ground circuits. See POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  2. Check fuel pressure. See CHECKING FUEL DELIVERY under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  3. Check engine coolant temperature sensor. See ENGINE COOLANT TEMPERATURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  4. Check throttle position sensor. See THROTTLE POSITION SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  5. Check manifold absolute pressure sensor. See MANIFOLD ABSOLUTE PRESSURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  6. Check idle air control motor operation. See IDLE AIR CONTROL MOTOR under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.

SPARK KNOCK/DETONATION

Check listed items as follows

  1. Check powertrain control module power and ground circuits. See POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  2. Check fuel pressure. See CHECKING FUEL DELIVERY under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  3. Check engine coolant temperature sensor. See ENGINE COOLANT TEMPERATURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  4. Check throttle position sensor. See THROTTLE POSITION SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  5. Check manifold absolute pressure sensor. See MANIFOLD ABSOLUTE PRESSURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  6. Check idle air control motor operation. See IDLE AIR CONTROL MOTOR under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.

CUTS OUT/MISSES

Check listed items as follows

  1. Check powertrain control module power and ground circuits. See POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  2. Check fuel pressure. See CHECKING FUEL DELIVERY under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  3. Check idle air control motor operation. See IDLE AIR CONTROL MOTOR under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.

BACKFIRE

Check listed items as follows

  1. Check powertrain control module power and ground circuits. See POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  2. Check fuel pressure. See CHECKING FUEL DELIVERY under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  3. Check manifold absolute pressure sensor. See MANIFOLD ABSOLUTE PRESSURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.

RUNS ROUGH/UNSTABLE, ERRATIC IDLE

Check listed items as follows

  1. Check powertrain control module power and ground circuits. See POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  2. Check engine vacuum. See CHECKING ENGINE VACUUM under PRELIMINARY INSPECTION & ADJUSTMENTS in BASIC DIAGNOSTIC PROCEDURES - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  3. Check fuel pressure. See CHECKING FUEL DELIVERY under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  4. Check engine coolant temperature sensor. See ENGINE COOLANT TEMPERATURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  5. Check throttle position sensor. See THROTTLE POSITION SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  6. Check manifold absolute pressure sensor. See MANIFOLD ABSOLUTE PRESSURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  7. Check idle air control motor operation. See IDLE AIR CONTROL MOTOR under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  8. Check inlet air temperature sensor. See INLET AIR TEMPERATURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.

POOR FUEL ECONOMY

Check listed items as follows

  1. Check powertrain control module power and ground circuits. See POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  2. Check engine vacuum. See CHECKING ENGINE VACUUM under PRELIMINARY INSPECTION & ADJUSTMENTS in BASIC DIAGNOSTIC PROCEDURES - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  3. Check fuel pressure. See CHECKING FUEL DELIVERY under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  4. Check engine coolant temperature sensor. See ENGINE COOLANT TEMPERATURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  5. Check throttle position sensor. See THROTTLE POSITION SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  6. Check manifold absolute pressure sensor. See MANIFOLD ABSOLUTE PRESSURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  7. Check idle air control motor operation. See IDLE AIR CONTROL MOTOR under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.
  8. Check inlet air temperature sensor. See INLET AIR TEMPERATURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article.

INTERMITTENT PROBLEM DIAGNOSIS

Intermittent fault testing requires duplicating circuit or component failure to identify the problem. These procedures may lead to PCM setting a Diagnostic Trouble Code (DTC) which may help in diagnosis.

If problem vehicle does not produce DTC, monitor voltage or resistance values using a DVOM while attempting to reproduce conditions causing intermittent fault. A status change on DVOM indicates a fault has been located.

Use a DVOM to pinpoint faults. When monitoring voltage, ensure ignition switch is in ON position or engine is running. Ensure ignition switch is in OFF position or negative battery cable is disconnected when monitoring circuit resistance. Status changes on DVOM during test procedures indicate area of fault.

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.

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