9-214 9-214
Engine Engine Cont Control rols s and Fuel Fuel - Marine Marine
Particulate Contaminants in Fuel Testing Procedure 1. Using Using an approved approved fuel container, container, draw approximately 0.5 liter (0.53 qt) of fuel. 2. Place the container container on a level surface for approximately 5 minutes in order to allow settling of the particulate contamination. Particulate contamination will show up in various shapes and colors. Sand will typically be identified by a white or light brown crystals. Rubber will appear as black and irregular particles. 3. Observe Observe the fuel sample. sample. If any physical contaminants or water are present, clean the fuel system.
Distributor Ignition (DI) System Diagnosis Diagnostic Instructions • Perfor Perform m the Powertrain the Powertrain On Board Diagnostic (OBD) System Check on page 9-64 prior to using this diagnostic procedure. • Review Review Strategy Strategy Based Diagnosis on page 6-4 for 6-4 for an overview of the diagnostic approach. • Diagnostic Procedure Instructions on page 6-5 provides provides an overview overview of each diagnostic diagnostic category. category.
Circuit/System Description The distributor ignition (DI) system uses the crankshaft position (CKP) sensor in order to provide a timing input to the engine control module (ECM). Ignition control (IC) spark timing for each cylinder is based on this input. The ECM provides the ignition timing signal to the ignition control module (ICM) to control the ignition coil. Each timing pulse detected by the ICM allows it to energize the ignition coil. A large secondary ignition voltage is induced in the secondary coil by the primary coil. This high voltage is switched to the correct spark plug by the distributor.
Reference Information Schematic Reference Engine Controls Schematics on page 9-6
Connector End View Reference • Engine Engine Control Module Connector Connector End Views Views on page 9-30 • Engine Controls Connector End Views on page 9-33
Electrical Information Reference • Circuit Testing on page 11-6 • Connector Repairs on page 11-22 • Testing for Intermittent Conditions and Poor Connections on page 11-13 • Wiring Repairs on page 11-16
Scan Tool Reference Engine Control Module Scan Tool Information on page 9-54
Special Tools J 26792 Spark Spark Tester
Circuit/System Verification Note: • Do not perform this diagnosti diagnostic c procedure if you were not sent here from a misfire DTC or the Engine Cranks but Does Not Run diagnostic. • It may be necessar necessary y to perfor perform m step 1 on a few of the spark plug wires. 1. Ignition Ignition OFF, connect connect the J the J 26792 to to the boot of a spark plug wire of a cylinder and ground. Note: An erratic or weak spark is considered a no spark condition. 2. Engine Engine cranking, cranking, the spark tester should spark. spark.
Circuit/System Testing 1. Ignition Ignition OFF, inspect inspect the spark plug wires, and coil wire for the following: • Mis-route Mis-routed d wires • Cracks Cracks in the insulation insulation • Improper Improper connection connection at the spark plugs and distributor cap ⇒ If
a condition is found, repair as necessary.
2. Disconnec Disconnectt the harness harness connector connector at the ICM. 3. Test Test for less less than 5 Ω between the ground circuit terminal C and ground. ⇒ If
greater than the specified range, repair the ground circuit for an open/high resistance.
4. Ignition Ignition ON, verify that a test lamp illuminates illuminates between the ignition voltage circuit terminal A and ground. ⇒ If
the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition voltage circuit fuse is open, test all components connected to the ignition voltage circuit and replace as necessary.
Note: Set the DMM to the DC 4 volt scale for this test. 5. Connect Connect a DMM between between the ignition ignition control circuit terminal B and ground. 6. Ignition Ignition ON, verify verify the voltage is less than 0.050 V. ⇒ If
greater than the specified range, test the circuit for a short to voltage.
7. Engine Engine cranking, cranking, verify the voltage voltage is greater greater than 100 mV. ⇒ If
less than the specified range, test the ignition control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
8. Ignition Ignition OFF, connect the ICM harness connector. connector. Disconnect the harness connector at the ignition coil. 2011 - Marine Engines Manual
Engine Controls and Fuel - Marine 9. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal A and ground. ⇒ If less than the specified range, repair the ignition voltage circuit for an open/high resistance. 10. Connect a test lamp between the coil driver circuit terminal C and B+. 11. Engine cranking, the test lamp should blink. ⇒ If the test lamp remains ON all the time, test the ignition control circuit for a short to ground. If the circuit tests normal, replace the ICM. ⇒ If the test lamp remains OFF all the time, test the ignition control circuit for a short to voltage, or an open/high resistance. If the circuit tests normal, replace the ICM. 12. Ignition OFF, connect the ignition coil harness connector. Disconnect the ignition coil wire from the distributor cap. Connect the J 26792 between the boot of the coil wire and ground. 13. Engine cranking, the spark tester should spark. ⇒ If the spark tester does not spark, test the coil wire for an open/high resistance. If the coil wire tests normal, replace the ignition coil. 14. Ignition OFF, remove the distributor cap. 15. Engine cranking, verify the distributor rotor is rotating. ⇒ If the distributor rotor does not rotate, repair the engine mechanical condition. 16. If all circuits test normal, inspect and replace the distributor cap and rotor.
Repair Instructions Perform the Diagnostic Repair Verification on page 6-22 after completing the diagnostic procedure. • Ignition Coil Replacement (3.0L) on page 9-241 or Ignition Coil Replacement (6.0L and 6.2L) on page 9-242 or Ignition Coil Replacement (4.3L, 5.0L, and 5.7L) on page 9-243 or Ignition Coil Replacement (2.4L) on page 9-244 • Spark Plug Wire Inspection on page 9-245 • Engine Control Module Programming and Setup on page 6-3 for ECM replacement, setup, and programming
Electronic Ignition System Diagnosis Diagnostic Instructions • Perform the Powertrain On Board Diagnostic (OBD) System Check on page 9-64 prior to using this diagnostic procedure. • Review Strategy Based Diagnosis on page 6-4 for an overview of the diagnostic approach. • Diagnostic Procedure Instructions on page 6-5 provides an overview of each diagnostic category. 2011 - Marine Engines Manual
9-215
Circuit/System Description Ignition 1 voltage is supplied to the ignition coil. The engine control module (ECM) provides a ground for the ignition coil (IC) control circuits. When the ECM removes the ground path of the ignition primary coil, the magnetic field produced by the coil collapses. The collapsing magnetic field produces a voltage in the secondary coil which ignites the spark plugs. The sequencing and timing are controlled by the ECM.
Reference Information Schematic Reference Engine Controls Schematics on page 9-6
Connector End View Reference • Engine Control Module Connector End Views on page 9-30 • Engine Controls Connector End Views on page 9-33
Electrical Information Reference • Circuit Testing on page 11-6 • Connector Repairs on page 11-22 • Testing for Intermittent Conditions and Poor Connections on page 11-13 • Wiring Repairs on page 11-16
Scan Tool Reference Engine Control Module Scan Tool Information on page 9-54
Circuit/System Testing Note: Do not perform this diagnostic procedure if you were not sent here from a misfire DTC or the Engine Cranks but Does Not Run diagnostic. 1. Ignition OFF, disconnect the harness connector at the ignition coil. 2. Test for less than 2 Ω between the ground circuit terminal A/1 and ground. ⇒ If greater than the specified range, repair the ground circuit for an open/high resistance. 3. Test for less than 2 Ω between the EST return circuit terminal B/2 and ground. ⇒ If greater than the specified range, test the EST return circuit for an open/high resistance. If the circuit tests normal, replace the ECM. 4. Ignition ON, load test for B+ between the ignition voltage circuit terminal D/4 and ground. ⇒ If less than the specified range, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition voltage circuit fuse is open, test all components connected to the ignition voltage circuit and replace as necessary. 5. If all circuits test normal, replace the ignition coil.
