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DTC P1640 - Output Driver Module (ODM) "A" Fault

  1. Perform On-Board Diagnostic (OBD) System Check. See BASIC TESTING article. After performing OBD system check, go to next step.
  2. Turn ignition on, engine off. Using scan tools CAPTURE INFO feature, read and record FAILURE RECORDS DATA. Turn ignition off. Disconnect PCM and turn ignition on. Using DVOM, measure voltage between output driver circuit at PCM harness connector and ground. If reading is about battery voltage, go to next step. If voltage is not as specified, go to step 6).
  3. Set DVOM to 10-amp range and measure current between component output driver circuit and ground. Monitor current reading on DVOM for at least 2 minutes. If current reading remains between .05-1.5 amps, go to step 11). If reading is not as specified, go to next step.
  4. Turn ignition off and disconnect ignition feed circuit (leaving PCM disconnected). Turn ignition on. Using DVOM, measure voltage between output driver circuit and ground. If reading is at zero volts, go to step 10). If voltages not as specified, go to next step.
  5. Locate and repair short to voltage in component output driver circuit. Retest system.
  6. Check components ignition feed fuse. If fuse is blown, go to next step. If fuse is not blown, go to step 8).
  7. Locate and repair short to ground in ignition feed circuit. Replace fuse. Retest system.
  8. Disconnect ignition feed circuit. Turn ignition on and measure voltage between ignition feed circuit and ground. If DVOM reads battery voltage, go to next step. If voltage reading is not as specified, go to step 13).
  9. Check for an open or short to ground in output driver circuit. If a problem is found, repair as necessary. Retest system. If no problem is found, go to next step.
  10. Check output driver circuit and ignition feed circuit at component and PCM for a poor connection. If a problem is found, repair as necessary. Retest system. If no problem is found, check for an intermittent problem. See TESTS W/O CODES article.
  11. Turn ignition off. Reconnect PCM and disconnect instrument cluster. Turn ignition on. Connect Test Light (J34142-B ) between output driver circuit and ignition feed circuit at instrument panel harness connector. Using scan tool, select output test function and cycle component on and off. If test light flashes on and off, check for an intermittent problem. See TESTS W/O CODES article. If test light does not flash, go to next step.
  12. Check output driver circuit for a poor connection at PCM. If a problem is found, repair as necessary. Retest system. If no problem is found, go to step 14).
  13. Repair open in ignition feed circuit for component. Retest system.
  14. Replace PCM. Retest system.
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