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Test A - No Start

  1. Try to start engine. If engine does not crank, check for excess fuel in cylinders (hydraulic lock) and check the starting/charging system. If engine cranks, but does not start or continue to run, proceed with test.
  2. Disconnect spark plug wire to any cylinder. Connect spark tester between plug wire and engine ground. Crank engine and check for spark. If spark is produced, go to step  13 . If not, go to next step. Reconnect spark plug wire to plug.
  3. Remove high tension coil wire from distributor and install spark tester. Check for spark while cranking. If spark is produced, service or repair TFI ignition system. If no spark, go to next step.
    Fig 1: TFI Module Circuit Diagram
    G10055
  4. Turn ignition off and wait for 10 seconds. Disconnect 60-pin harness connector at ECA. Inspect for damaged pins, corrosion, or loose wires. Repair as required. Install breakout box (timing switch in "Computed" position). Turn ignition on (engine off). With DVOM on 20 volt scale, measure voltage from box pin 37 to box pins 40, 57 and 60 in turn. If either voltage reading is less than 10.5 volts, perform TEST B  . If voltage readings are 10.5 volts or greater, continue test.
  5. Turn ignition off and wait 10 seconds. With DVOM on 200 ohm scale, measure between box pin 16 to TFI connector (ignition ground). If resistance is 5 ohms or greater, repair harness and repeat QUICK TEST  . If resistance is less than 5 ohms, go to next step.
  6. Reconnect 60-pin harness at ECA. With breakout box still connected, set timing switch to "Dist" position. Try to start vehicle. If vehicle starts, go to step  10 . If not, go to next step.
  7. Turn timing switch to "Computed" position. Set DVOM on 20 volt scale and measure from box pin 36 to chassis ground while cranking engine. If voltage is between 3-6 volts, EEC system is okay. Service TFI ignition system. If voltage is less than 3 volts or greater than 6 volts, continue test.
  8. Turn ignition off and wait 10 seconds. Disconnect 60-pin harness at ECA. Disconnect TFI. With DVOM set on 200,000 ohm scale, measure resistance from box pin 36 to pins 16, 20, 26, 40 and 60 in turn, for short to ground; from box pin 36 to pins 37 and 57 in turn, for short to power; from box pin 36 to 56 for short to PIP. If any reading is less than 10,000 ohms, repair short and repeat test if vehicle does not start. If all readings are 10,000 ohms or more, go to next step.
  9. Turn ignition off and wait 10 seconds. Reconnect 60-pin harness at ECA (TFI still disconnected). With DVOM on 200 ohm scale, measure resistance from box pin 36 to pins 37 and 57 for short to power; from box pin 36 to pins 40 and 60 for short to ground. If any reading is less than 5 ohms, replace ECA and repeat QUICK TEST  . If all readings are 5 ohms or more, continue test.
  10. With DVOM on 20 volt scale, measure voltage from box pin 56 to pin 16 while cranking engine. If voltage is between 3-6 volts, remove breakout box and replace ECA. Repeat QUICK TEST  . If voltage is less than 3 volts or more than 6 volts, go to next step.
  11. Turn ignition off and wait 10 seconds. Disconnect 60-pin harness at ECA. With DVOM on 200 ohm scale, measure resistance from box pin 56 to PIP circuit of TFI connector. If resistance is 5 ohms or greater, repair open and repeat QUICK TEST  . If resistance is less than 5 ohms, continue to next step.
  12. With ECA and TFI harnesses still disconnected and ignition off, set DVOM on 200,000 ohm scale. Measure resistance from box pin 56 to pins 16, 20, 40 and 60 in turn, for short to ground; from box pin 56 to pins 37 and 57 in turn, for short to power; from box pin 56 to pin 36 for short to spark output. If any resistance is less than 10,000 ohms, service PIP circuit. If all resistances are greater than 10,000 ohms, service TFI ignition system.
  13. Turn ignition off and wait 10 seconds. Disconnect 60-pin connector at ECA and check for damaged pins, corrosion and loose wires. Service as required. Install breakout box (timing switch at "Computed" position). Reconnect 60-pin connector at ECA. With DVOM on 20 volt scale, measure voltage from box pin 36 to chassis ground while cranking engine. If voltage is less than 3 volts or greater than 6 volts, go to step  10 . If voltage is 3-6 volts, check fuel system.
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