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Engine Cranks But Does Not Start: Testing

  1. The following checks must be performed before continuing with this test.
    • Ensure battery is fully charged and in good condition. If battery charge is low, charge battery and crank engine for 15 seconds, 3 consecutive times. This will allow any Diagnostic Trouble Codes (DTC) that may have been erased due to low battery charge, to set in memory.
    • Ensure Powertrain Control Module (PCM) power and ground circuits are okay. See COMPUTERIZED ENGINE CONTROLS in appropriate SYSTEM & COMPONENT TESTING article.
    • Ensure PCM communicates with scan tool and no DTC are present. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article.
    • Ensure PCI bus is functional. Using scan tool, attempt to communicate with instrument cluster and Sentry Key Immobilizer Module (SKIM). If scan tool does not communicate with instrument cluster or SKIM, diagnose communication failure. See COMMUNICATIONS under SYSTEM TESTS in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
    • Using scan tool select CLEAR PCM (BATT DISCONNECT). Crank engine over several times. Using scan tool, check for DTCs. If any DTCs are present, perform appropriate diagnostic test. See appropriate SELF-DIAGNOSTICS article. If no DTCs exist, go to next step.
  2. Turn ignition on. Using scan tool, monitor SECONDARY INDICATORS while cranking engine. If no SECONDARY INDICATORS exist, go to next step. If any SECONDARY INDICATORS exist, perform appropriate symptom test related to indicator. See appropriate TROUBLE SHOOTING - NO CODES article.
  3. Turn ignition off. Check Power Distribution Center (PDC) and junction block for blown fuses. See Figure or Figure . PDC is located at driver's side front corner of engine compartment, near battery. Junction block is located behind left kick panel. Replace blown fuses and check related circuits for short to ground. If fuses are okay, go to next step.
  4. Using scan tool in SENSOR mode, monitor CURRENT CKP COUNT while cranking engine. If CKP count changes while cranking engine, go to next step. If CKP count does not change while cranking engine, go to DTC P0320: NO CRANK REFERENCE SIGNAL AT PCM under DIAGNOSTIC TESTS in appropriate SELF-DIAGNOSTICS article.
  5. Using scan tool in SENSOR mode, monitor CURRENT CMP COUNT while cranking engine. If CMP count changes while cranking engine, go to next step. If CMP count does not change while cranking engine, go to DTC P0340: NO CAM SIGNAL AT PCM under DIAGNOSTIC TESTS in appropriate SELF-DIAGNOSTICS article.
  6. Ensure ignition is on. Using scan tool in INPUTS/OUTPUTS mode, read CURRENT SYNC STATE while cranking engine. If scan tool does not display OUT OF SYNC, go to next step. If scan tool displays OUT OF SYNC, check CKP sensor signal circuit for short to CMP sensor signal circuit. See WIRING DIAGRAMS article. Repair wiring as necessary. If wiring is okay, check for incorrect valve timing or for CMP sensor drive problem. Repair valve timing or CMP sensor drive as necessary. See appropriate article in ENGINES.
  7. Use spark tester to check spark at spark plug. Ensure spark tester is properly grounded to prevent damage to ignition coil. Crank engine for 10 seconds and check for spark. Consider 1-2 sparks as a no spark condition. If good spark does not exist, reconnect spark plug wire and go to next step (except 4.7L), or go to step  9 (4.7L). If good spark exists, reconnect spark plug wire and go to step  13 .
    8. NOTE: The following test step is for models without coil-on-plug.
  8. Ensure ignition is off. Remove ignition coil wire from distributor cap. Connect ignition coil wire to spark tester. Ensure tester is properly grounded. Crank engine for 10 seconds and check for spark. Consider 1-2 sparks as a no spark condition. If good spark does not exist, remove tester and go to next step. If good spark exists, replace distributor cap, rotor or spark plug wires that caused the loss of spark.
  9. Ensure ignition is off. Disconnect ignition coil connector. Using ohmmeter, check ignition coil primary resistance between both electrical terminals on ignition coil. Ignition coil primary resistance should be within specification. See IGNITION COIL RESISTANCE  table. If ignition coil primary resistance is within specification, go to next step. If ignition coil primary resistance is not within specification, replace ignition coil.
  10. Check ignition coil secondary resistance. Using ohmmeter, measure between ignition coil driver circuit terminal at ignition coil and ignition coil output tower. Refer to appropriate wire color for suspect coil in COIL DRIVER CIRCUIT IDENTIFICATION  table. For resistance specifications, see IGNITION COIL RESISTANCE  table. If ignition coil secondary resistance is within specification, go to next step. If ignition coil secondary resistance is not within specification, replace ignition coil.
    COIL DRIVER CIRCUIT IDENTIFICATION (1)

    Coil Driver No. PCM Connector/Terminal No. (Wire Color)
    1 C1/7 (Black/Gray)
    2 C2/9 (Tan/Pink)
    3 C1/1 (Tan/Orange)
    4 C1/3 (Tan/Light Green)
    5 C1/21 (Tan/Dark Green)
    6 C1/5 (Tan/Light Blue)
    7 C2/7 (Dark Blue/Tan)
    8 C1/9 (Light Blue/Red)
    (1) For PCM harness connector terminal identification, see Fig 1 .
    11. NOTE: For applications without coil-on-plug, coil driver circuit No. 1 is only circuit tested.
    Fig 1: Identifying Powertrain Control Module Connector Terminals
    G00010241Courtesy of DAIMLERCHRYSLER CORPORATION
  11. Ensure ignition coil connector is still disconnected. Using 12-volt test light connected to positive battery voltage, probe appropriate ignition coil harness connector coil driver circuit terminal while cranking engine. See COIL DRIVER CIRCUIT IDENTIFICATION  table. If test light flashes on and off while cranking engine, go to next step. If test light does not flash on and off while cranking engine, check for open or short in appropriate coil driver circuit between ignition coil and PCM. PCM is located at passenger's side front corner of engine compartment on inner fender panel. If open or short exists in coil driver circuit, repair wiring as necessary. If open or short does not exist in coil driver circuit, replace PCM.
  12. Ensure ignition coil connector is still disconnected. Turn ignition on with engine off. Using scan tool, actuate ASD relay. Using 12-volt test light connected to ground, probe ignition coil harness connector power circuit terminal (Dark Green/Orange wire). If test light illuminates brightly, stop actuation of ASD relay and go to next step. If test light does not illuminate brightly, stop actuation of ASD relay. Check for open or high resistance in Dark Green/Orange wire between ASD relay and ignition coil. ASD relay is located in PDC. PDC is located at driver's side front corner of engine compartment, near battery. See Figure or Figure . If wiring is okay, check ASD relay power supply fuses and ASD relay (located in PDC). Go to AUTO SHUTDOWN RELAY under MOTORS, RELAYS & SOLENOIDS in appropriate SYSTEM & COMPONENT TESTING article.
  13. Using scan tool, actuate fuel pump relay. Using a mechanic's stethoscope, listen for fuel pump operation at fuel tank. If fuel pump operation cannot be heard, stop ASD fuel system actuation and go to step  20 . If fuel pump operation can be heard, stop ASD fuel system actuation and go to next step.
  14. Check the following conditions and/or mechanical components:
    • Ensure engine valve timing is within specification.
    • Ensure engine compression is within specification. See COMPRESSION SPECIFICATIONS  table.
    • Ensure engine exhaust system is free of restrictions and/or leaks.
    • Ensure fuel is free of contamination.
    • Ensure fuel injectors are not plugged or restricted, and injector driver circuit wires are connected to proper fuel injectors.

    Repair as necessary. If no mechanical faults are found, go to next step.

    15. WARNING: High fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL SYSTEM PRESSURE RELEASE  .
  15. Turn ignition off. Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE  . Remove test port cap. Install a 0-60 psi (0-4.2 kg/cm2 ) fuel pressure gauge at test port. Turn ignition on, with engine off. Using scan tool, actuate fuel pump relay. Allow fuel pressure gauge to stabilize. Stop ASD fuel system activation. Fuel pressure should be 44.2-54.2 psi (3.1-3.8 kg/cm2 ). If fuel pressure is less than specified, go to next step. If fuel pressure is more than specified, replace fuel filter/pressure regulator. If fuel pressure is as specified, go to step  19 .
  16. Raise and support vehicle. Check for signs of damage in fuel supply line from fuel pump module to fuel rail that may restrict supply line. Repair or replace fuel supply line as necessary. If fuel supply line is okay, go to next step.
  17. Release fuel pressure. Remove fuel pump module and inspect fuel inlet strainer. See FUEL PUMP MODULE under FUEL SYSTEMS in appropriate REMOVAL, OVERHAUL & INSTALLATION article. If fuel inlet strainer is plugged, replace fuel pump inlet strainer. If fuel inlet strainer is not plugged, go to next step.
  18. At this time, fuel pump module is assumed to be defective. Replace fuel pump module.
    19. CAUTION: DO NOT operate fuel pump longer than 7 seconds.
  19. Fuel pump volume should be checked. Perform FUEL PUMP VOLUME TEST  under FUEL SYSTEMS. If fuel pump volume is within specification, test is complete. If fuel pump volume is not within specification, check for a kinked or damaged fuel supply line between fuel pump module and fuel rail. Repair fuel supply line as necessary. If fuel supply line is okay, replace fuel pump module. See FUEL PUMP MODULE under FUEL SYSTEMS in appropriate REMOVAL, OVERHAUL & INSTALLATION article.
  20. Turn ignition off. Disconnect fuel pump module connector. Using DVOM, measure resistance between ground and fuel pump module harness connector terminal No. 1 (Black wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black wire between fuel pump module and ground point. See WIRING DIAGRAMS article.
  21. Ensure ignition is off. Ensure fuel pump module is disconnected. Remove fuel pump relay from PDC. Check for battery voltage at fuel pump relay cavity No. 30 (Red/White wire) in PDC. See Figure or Figure . If battery voltage is present, go to next step. If battery voltage is not present, check for open in Red/White wire between fuel pump relay and fuse No. 2 (20-amp) in PDC. If wiring is okay, check for blown fuse No. 2 or for open power supply circuit to fuse No. 2. See appropriate POWER DISTRIBUTION article in WIRING DIAGRAMS.
  22. Ensure ignition is off. Ensure fuel pump relay is removed from PDC. Measure resistance of Dark Green/Black wire between fuel pump module harness connector terminal No. 1 and fuel pump relay cavity No. 87 in PDC. See Figure or Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Green/Black wire between fuel pump module and PDC.
  23. Ensure fuel pump relay is removed from PDC. Using DRB-III(R) scan tool, actuate fuel pump relay. Using 12-volt test light connected to positive battery voltage, probe fuel pump relay cavity No. 85 (Brown wire). If test light illuminates brightly, circuit is okay. Replace fuel pump relay. If test light does not illuminate brightly, stop actuation of fuel pump relay. Check for open in Brown wire between fuel pump relay and PCM. See WIRING DIAGRAMS article. If wiring is okay, replace PCM.
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