360 FBO Ignition no spark
All of these steps checked out to verify working during the no start condition. Plus the cap and rotor were changed as well. Am I mistaken, but a wiring issue would have failed with the distributor pickup test or at the wiring harness test at the ECU.
My ohms resistance at the ECU was about 293 at distibutor pickup connector and ECU wiring harness connector. Voltage while cranking at the distributor lead was about .3 or so.
Steps:
Turn Ignition Switch OFF.
Connect one multimeter lead to the harness connector cavity No. 4 and the other multimeter lead to the harness connector cavity No. 5
Set Multimeter to read Resistance (Ohms)
Verify Distributor Pick-up Sensor resistnace is between 150 to 900 Ohms.
If resistance is correct, go to step 28 (1st Distributor Pick-up Sensor check OK) otherwise continue to next step.
Unplug the Pick-up Sensor (lead from Distributor).
On the Pick-up sensor distributor lead, connect one multimeter lead to one pin in the plug and the other multimeter lead to the other pin in the plug
Verify Distributor Pick-up Sensor resistnace is between 150 to 900 Ohms.
If resistance is correct, the wiring from the ECM plug to the distributor plug is defective. Repair wiring.
If the resistance is incorrect, replace Distributor Pick-up Sensor
NOTE:
If you have a Actron CP9087 Ignition Module and Sensor Testor, perform Sensor Test (Section 2, page 2-46 of the tester manual, Magnetic Reluctance version)
Connect one multimeter lead to the harness connector cavity No. 4 and the other multimeter lead to a good ground
Verify there is no continuity (open circuit; maximum resistance).
If there is no continuity, go to step 31 (2nd Distributor Pick-up Sensor check OK) otherwise continue to next step
Distributor Pick-up Sensor is shorted to ground. Replace Distributor Pick-up Sensor.
Connect one multimeter lead to the ECM pin 5 and the other multimeter lead to a good ground
Verify there is continuity.
If there is continuity, go to step 34 (ECM Ground check OK) otherwise continue to next step.
Tighten bolts holding ECM module to mounting plate. Retry steps 31 and 32. If there is now continuity, got to next step, otherwise replace ECM module.
Reinstall wiring plug to Control Unit (ECM).
All components and wiring to the ECM module have been verified to be working correctly. If there is still no spark to the plugs then the problem is one or more of the following:
Distributor Cap and/or Rotor is defective. Replace Distributor Cap and Rotor.
Distributor Pick-up Air Gap is incorrect. Adjust Distributor Pick-up Air Gap (0.008" Air Gap).
Distributor Reluctor is damaged. Replace Distributor Reluctor.
ECM module is defective. Replace ECM module.
That's what I figured but when I tested the ohms resistance at the ECU for pins 4 and 5 it was in spec...
All of these steps checked out to verify working during the no start condition. Plus the cap and rotor were changed as well. Am I mistaken, but a wiring issue would have failed with the distributor pickup test or at the wiring harness test at the ECU.
My ohms resistance at the ECU was about 293 at distibutor pickup connector and ECU wiring harness connector. Voltage while cranking at the distributor lead was about .3 or so.
Steps:
Turn Ignition Switch OFF.
Connect one multimeter lead to the harness connector cavity No. 4 and the other multimeter lead to the harness connector cavity No. 5
Set Multimeter to read Resistance (Ohms)
Verify Distributor Pick-up Sensor resistnace is between 150 to 900 Ohms.
If resistance is correct, go to step 28 (1st Distributor Pick-up Sensor check OK) otherwise continue to next step.
Unplug the Pick-up Sensor (lead from Distributor).
On the Pick-up sensor distributor lead, connect one multimeter lead to one pin in the plug and the other multimeter lead to the other pin in the plug
Verify Distributor Pick-up Sensor resistnace is between 150 to 900 Ohms.
If resistance is correct, the wiring from the ECM plug to the distributor plug is defective. Repair wiring.
If the resistance is incorrect, replace Distributor Pick-up Sensor
NOTE:
If you have a Actron CP9087 Ignition Module and Sensor Testor, perform Sensor Test (Section 2, page 2-46 of the tester manual, Magnetic Reluctance version)
Connect one multimeter lead to the harness connector cavity No. 4 and the other multimeter lead to a good ground
Verify there is no continuity (open circuit; maximum resistance).
If there is no continuity, go to step 31 (2nd Distributor Pick-up Sensor check OK) otherwise continue to next step
Distributor Pick-up Sensor is shorted to ground. Replace Distributor Pick-up Sensor.
Connect one multimeter lead to the ECM pin 5 and the other multimeter lead to a good ground
Verify there is continuity.
If there is continuity, go to step 34 (ECM Ground check OK) otherwise continue to next step.
Tighten bolts holding ECM module to mounting plate. Retry steps 31 and 32. If there is now continuity, got to next step, otherwise replace ECM module.
Reinstall wiring plug to Control Unit (ECM).
All components and wiring to the ECM module have been verified to be working correctly. If there is still no spark to the plugs then the problem is one or more of the following:
Distributor Cap and/or Rotor is defective. Replace Distributor Cap and Rotor.
Distributor Pick-up Air Gap is incorrect. Adjust Distributor Pick-up Air Gap (0.008" Air Gap).
Distributor Reluctor is damaged. Replace Distributor Reluctor.
ECM module is defective. Replace ECM module.
