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Diagnosis & Repair

  1. Connect scan tool to DLC. Turn ignition on. Using scan tool, clear DTC information. Place vehicle into check mode. Crank engine over to complete 6 consecutive ignition cycles. If DTC P1300 sets, go to next step. If DTC P1300 does not set, go to DIAGNOSTIC AIDS. Check for an intermittent problem. See the TESTS W/O CODES article.
  2. Turn ignition off. Disconnect ignitor harness connector. Turn ignition on. Using a voltmeter, measure voltage between ground and ignitor connector terminal No. 1 (Blue/Yellow wire). If voltage is 4-6 volts, go to next step. If voltage is not as specified, Check for open or short in Blue/Yellow wire between PCM 26-pin connector terminal No. 3 and ignitor. Repair as necessary. If wire is okay, replace PCM. After repair is completed, go to step 14).
  3. Using a voltmeter, crank engine and measure voltage between ground and ignitor connector terminal No. 2 (Yellow/Green wire). If voltage is 1.5 volts, go to next step. If voltage is not as specified, check for an open or short in Yellow/Green wire between PCM 26-pin connector terminal No. 20 and ignitor. Repair as necessary. If wire is okay, replace PCM. After repair is completed, go to step 14).
  4. Using a voltmeter, measure voltage between ground and ignitor connector terminal No. 5 (Black wire). If voltage is 10-12 volts, go to step 7). If voltage is not as specified, go to next step.
  5. Using a voltmeter, backprobe between ground and distributor connector terminal No. 4 (Black wire). If voltage is 12 volts, repair open or short in Black wire between ignition coil and ignitor. After repair is completed, go to step 14). If voltage is not as specified, go to next step.
  6. Disconnect distributor connector. Using a voltmeter, measure voltage between ground and distributor connector terminal No. 3 (Black/Orange wire). If voltage is 12 volts, replace ignition coil. After repair is completed, go to step 14). If voltage is not as specified, go to step 9).
  7. Using a voltmeter, measure voltage between ground and ignitor connector terminal No. 3 (Black wire). If voltage is 12 volts, go to next step. If voltage is not as specified, go to step 11).
  8. Remove terminal No. 4 from ignitor connector. Reconnect connector to ignitor with terminal No. 4 removed. Attempt to start engine. If engine starts, repair short in Black wire between ignitor connector terminal No. 4 and instrument cluster 16-pin connector terminal No. 11. If engine does not start, replace ignitor. After repair is completed, go to step 14).
  9. Using a voltmeter, measure voltage between ground and junction block No. 1, 16-pin connector terminal No. 4 (Black/Orange wire). Junction block No. 1 is located under instrument panel behind left kick panel. If voltage is 12 volts, go to step 12). If voltage is not as specified, go to next step.
  10. Using a voltmeter, measure voltage between ground and ignition switch connector terminal No. 2 (Black/Red wire). If voltage is 12 volts, go to step 13). If voltage is not as specified, repair open or short in Black/Red wire between battery and ignition switch. After repair is completed, go to step 14).
  11. Check for an open or short in ignition power feed circuit between junction block No. 1, 16-pin connector terminal No. 13 (Black/Orange wire) and ignitor connector terminal No. 3 (Black wire). Black/Orange wire changes to Black wire. Repair as necessary. If wire is okay, repair open or short in Black/Red wire between battery and ignition switch. After repair is completed, go to step 14).
  12. Check for open or short in Black/Orange wire or Black wire between junction block No. 1, 16-pin connector terminal No. 13 and ignitor connector terminal No. 3 or between junction block No. 1, 16-pin connector terminal No. 13 and distributor connector terminal No. 3. Repair as necessary. If wires are okay, replace junction block No. 1. After repair is completed, go to step 14).
  13. Check for open or short in Black/Orange wire between ignition switch connector terminal No. 3 and junction block No. 1, 6-pin connector terminal No. 4. Repair as necessary. If wire is okay, replace ignition switch. After repair is completed, go to next step.
  14. After repairs, using scan tool, clear DTC information. Road test vehicle within freeze frame conditions that set DTC. Check for DTCs. If no DTCs are stored, repair is complete. If any DTCs are set, go to appropriate DTC diagnostic test.
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