Note: Resistance varies with coil temperature: nominal values are given at 20°C.
Primary winding resistance (between terminals A and B): 0.63-0.77 Ohm
Secondary winding resistance (between terminals A and B of the secondary winding): 12.8-19.2 Ohm
1. secondary winding terminal; 2. terminal a (+); 3. terminal B (-)
Testing the Ignition Control Module (ICM) Input Signal
1. Remove the distributor cap, rotor and rear cover.
2. Disconnect the wires from the ICM unit.
1. ICM block; 2. yellow-green wire; 3. black and yellow wire; 4. white and blue wire
3. Turn the ignition switch to the ON (II) position. Check for voltage between the BLACK/YELLOW wire and chassis ground. There should be battery voltage.
- If there is no battery voltage, check the BLACK/YELLOW wire between the under-dash fuse/relay box and the ICM.
- If there is battery voltage, proceed to step 4.
4. Turn the ignition key to the ON (II) position. Check for voltage between the WHITE/BLUE wire and chassis ground. There should be battery voltage.
- If there is no battery voltage, check:
- ignition coil
- WHITE/BLUE wire between ignition coil and ICM
- If there is battery voltage, proceed to step 5.
5. Check for continuity through the BLUE wire between the tachometer connector and the ICM. There should be continuity.
6. Check if there is conductivity through the BLUE wire to the chassis ground. There should be no conductivity.
7. If all tests are normal, replace the ICM.