LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Ford >> 1989 >> Taurus SHO >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Ignition System - DISTRIBUTORLESS >> Testing >> Dis Module, Harness & Sensors
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Dis Module, Harness & Sensors

  1. Disconnect module from DIS input tee. While cranking engine in very short bursts. Measure voltage between J51 and J2. If 2 readings, zero and 10-12 volts (5.5-7.5 volts if engine runs) are present, replace DIS module. If the readings are not present, proceed to step 2).
  2. While cranking engine in very short bursts, measure voltage between J21 and J2. If 2 readings, zero and 10-12 volts (5.5-7.5 volts if engine runs) are present, CID circuit is open. Repair harness. If readings are not present, proceed to step 3).
  3. With ignition on, if voltage between J41 and J2 is more than 11 volts, proceed to step 4). If voltage is less than 11 volts, VBATCS circuit is at fault. Repair harness.
  4. With ignition off, if resistance between J42 and J2 is less than 5 ohms, proceed to step 5). If more than 5 ohms, IGND is open. Repair IGND circuit.
  5. If resistance between J21 and J51 is less than 5 ohms, proceed to step 6). If more than 5 ohms, CID circuit is open. Repair harness.
  6. Disconnect CID sensor from CID tee. With ignition off, if resistance between J51 and J2 is more than 10k ohms, proceed to step 7). If less than 10k ohms, CID is shorted to GND. Repair harness.
  7. With ignition off, if resistance between J51 and J5 is more than 10k ohms, replace CID sensor. If less than 10k ohms, CID is shorted to VBAT.
  8. While cranking engine in very short bursts, if voltage readings between J35 and J2 are zero and 10-12 volts, PIP is open. Repair harness. If readings are not zero and 10-12 volts, proceed to step 9).
  9. With ignition off, if resistance between J35 and J32 is less than 5 ohms, proceed to step 10). If more than 5 ohms, PIP is open. Repair harness.
  10. Disconnect DIS module from DIS input tee. Repeat step 8). If test light flashes, replace DIS module. If test light does not flash, proceed to step 11).
  11. With ignition on, if voltage between J56 and J2 is more than 11 volts, proceed to step 12). If less than 11 volts, proceed to step 13).
  12. With key off, if resistance between J55 and negative battery terminal less than 5 ohms, proceed to step 13). If more than 5 ohms, repair harness.
  13. Disconnect crank sensor from crank sensor tee. Repeat procedure in step 11). If more than 11 volts is present, replace crank sensor. If more than 11 volts is not present, VBAT to crank sensor circuit is damaged. Repair harness.
  14. If a continuous service code of 18 was observed during Self-Test, replace DIS module. If not, proceed to appropriate EEC-IV article in COMPUTERIZED ENGINE CONTROLS section listed below.
scientia non olet · About LEMON Manuals