Section 4.14 Crank No Start

Section 4.14
Crank No Start

The engine cranks but does not start.‪

Check for the following:‪

  • Low Fuel Level
  • Air Inlet and Exhaust Restrictions
  • No RPM While Cranking (using DDDL 7.0)
  • Low Cranking Speed
  • No or Low Fuel Pressure
  • Defective Fuel Pump
  • High Fuel Pressure
  • Engine Timing Off
  • Low Compression

Section 4.14.1
Low Fuel Level and Air Inlet and Exhaust Restrictions

Check as follows:‪

  1. Check for low fuel level.
    1. isually inspect fuel tank for proper fuel level; if low/empty, fill the tank and verify repairs.
    2. If fuel level is acceptable, go to the next step.
  2. Check the air inlet and exhaust restrictions.
    1. Visually inspect the air intake and exhaust system for restrictions; if found, repair as necessary and verify repairs.
    2. If no damage is found, go to No RPM Data Received via DDDL 7.0, refer to "4.14.2 No RPM Data Received via DDDL 7.0" .

Section 4.14.2
No RPM Data Received via DDDL 7.0

Check No RPM data received via DDDL 7.0 while cranking (if RPM is present while cranking, go to Low Cranking Speed, minimum crank speed 80 RPM, refer to "4.14.3 Low Cranking Speed" , “Low Cranking Speed”).‪

  1. Disconnect the MCM 120–pin connector.
  2. Install breakout box J-48475 and use cables J-48583.
  3. Measure the resistance between pins 44 and 45 of the MCM 120 pin connector.
    1. If the resistance is less 140 Ω, go to step 4 .
    2. If the resistance is greater than 140 Ω, go to step 6 .
  4. Disconnect the CMP Sensor.
  5. Measure the resistance between pins 44 and 45 on the breakout box.
    1. If the resistance is less than 3 Ω, repair short between MCM pins 42 and 43 the CMP Sensor.
    2. If the resistance is greater than 3 Ω replace the CMP Sensor.
  6. Disconnect the CMP Sensor.
  7. Install a jumper wire between pins 1 and 2 on the CMP harness connector.
  8. Measure the resistance between pins 44 and 45 on the breakout box.
    1. If the resistance is greater than 3 Ω, go to step 9 .
    2. If the resistance is less than 3 Ω, replace the CMP Sensor.
  9. Measure resistance between pin 44 on the breakout box and pin 1 on the harness side of the CMP connector.
    1. If the resistance is less than 3 Ω, repair open on wire between pins 45 of the MCM 120–pin connector and pin 2 on the CMP connector.
    2. If the resistance is greater than 3 Ω, repair the open wire between pin 44 of the MCM 120–pin connector and pin 1 on the harness side of the CMP connector.

Section 4.14.3
Low Cranking Speed

Start troubleshooting by checking the battery voltage as follows:‪

  1. Check the batteries by removing the surface charge from the batteries.
    1. Turn the ignition OFF.
    2. Turn ON the headlights for two to three minutes.
  2. Check the battery voltage.
    1. If the battery voltage is not below 12 volts, refer to "4.14.3.1 Battery Cable Voltage Drop Test" , “Battery Cable Voltage Drop Test.”
    2. If the battery voltage is below 12 volts, charge the batteries then proceed with the next step.
  3. Check the condition of the batteries individually; refer to diagnostics in the OEM manual.
    1. If all the batteries are good, go to the next step.
    2. If the batteries are not good, replace them and go to the next step.
  4. Reconnect the batteries.
  5. Start the engine. Does the engine start normally?
    1. If yes, check the charging system diagnostics in the OEM manual.
    2. If no, refer to "4.14.3.1 Battery Cable Voltage Drop Test" , “Battery Cable Voltage Drop Test.”
Section 4.14.3.1
Battery Cable Voltage Drop Test

Check as follows:‪

  1. Disable the engine from starting by disconnecting the MCM 120–pin connector. This allows cranking without starting the engine.
  2. Attach a long jumper lead from the battery negative post to the negative lead of the voltmeter.
  3. Connect the positive lead of the voltmeter to the three locations listed below, measuring voltage at each point, one at a time while the starter is cranking.
    1. Starter solenoid battery terminal
    2. Starter motor terminal on the starter solenoid
    3. Starter ground terminal
  4. Connect the volt meter to the battery positive and negative terminals. Measure voltage when cranking the engine.
  5. Compare the battery voltage to reading taken in step 4 to the voltage reading taken in step 3.
  6. Is there more that a one volt difference between the battery voltage ( go to step 4 ) and the voltage at the battery terminal on the starter solenoid ( go to step 3a )?
    1. If yes, repair bad connection or wire between the battery positive terminal and the battery terminal on the starter solenoid.
    2. If no, go to the next step.
  7. Is there more than one volt difference between the batteries and the starter motor terminal on the starter solenoid?
    1. If yes, refer to the OEM manual for starter diagnostics.
    2. If no, go to the next step.
  8. Is there more than one volt difference between the battery negative terminal and the starter ground terminal?
    1. If yes, repair bad connection or wire between the battery negative terminal and the starter ground terminal.
    2. If no, refer to starter diagnostics in the OEM manual.

Section 4.14.4
No or Low Fuel Pressure/Leaks

Visually inspect the entire fuel system for leaks. If leaks are found, repair as necessary. If no leaks are found, check the fuel pressure. Refer to "4.14.4.1 Fuel Pressure Test" .‪

Section 4.14.4.1
Fuel Pressure Test

Test as follows:‪

  1. Verify that there is ample fuel in the tanks, if tanks are low fill with Ultra Low Sulfur Fuel.
  2. Remove the supply fuel temperature sending unit from the fuel pump.
  3. Attach a calibrated gauge capable of reading 0-551 kPa (0-80 psi) to the fuel pump port. Crank or start the engine and record the reading on the gauge.
    1. If pressure is 0-60 kPa (0-10 psi) within 20 seconds of cranking, refer to "4.14.4.2 No or Low Fuel Pressure Test" , “No or Low Fuel Pressure Test.”
    2. If pressure is below 420 kPa (61 psi) with the engine running, refer to "4.14.4.2 No or Low Fuel Pressure Test" , “No or Low Fuel Pressure Test.”
    3. If pressure is above 490 kPa (71 psi) with the engine running, refer to "4.14.4.3 High Fuel Pressure Test" , “High Fuel Pressure Test.”
    4. If pressure is between 420–490 kPa (61 -71 psi) with the engine running, refer to "12.11 Incorrect Camshaft Timing" 12.11, “Incorrect Camshaft Timing.”
Section 4.14.4.2
No or Low Fuel Pressure Test

Check as follows:‪

  1. Remove the fuel suction line going to the fuel pump.
  2. Tee in a vacuum gauge into the pump and the line. Start/Crank the engine over.
  3. Is the reading on the gauge greater than 6-12 in.H2 O?
    1. If yes, check the suction line from the fuel pump to the fuel tank for a restriction (bent, kinked, or internally collapsed). If there is no damage check fuel filter, get customer approval to replace the filters.
    2. If no, go to step 4 .
  4. Replace the fuel pressure regulator and retest the fuel pressure. If the fuel pressure is still not within specs, refer to "4.14.4.4 Fuel Pump Test" , “Fuel Pump Test.”
Section 4.14.4.3
High Fuel Pressure Test

Check as follows:‪

  1. Tee in a pressure gauge into the return line after the fuel pressure regulator.
  2. Start the engine and monitor the gauge.
  3. Is the pressure reading on the gauge above 3 psi?
    1. If yes, check the fuel return line for damage (kinked, internally collapsed, or bent closed) If damaged repair as needed.
    2. If no, replace the Fuel Pressure Regulator.
Section 4.14.4.4
Fuel Pump Test

Check as follows:‪

  1. Remove the fuel pump from the engine.
  2. Crank the engine over and visually inspect the air compressor shaft.
    1. If air compressor shaft is not turning, verify air compressor operation. Refer to the Bendix web site at http:\\www.bendix.com or call the Bendix Technical Assistance Center at 1-800-AIR-BRAKE, (1-800-247-2725).
    2. If air compressor shaft is turning, replace the fuel pump.

Section 4.14.5
Engine Timing

Check Cam timing, refer to "12.11 Incorrect Camshaft Timing" , “Incorrect Camshaft Timing” in the EPA07 Series 60 Service Manual (6SE2007).‪

Section 4.14.6
Low Compression

Perform DDDL 7.0 compression test service routine, based on results then perform Manual Compression Test, (refer to "4.12.1.2 Cylinder Compression Test" ).‪


EPA07 Series 60 DDEC VI Troubleshooting Guide - 6SE567
Generated on 10-13-2008

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