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DTC P1530: Ignition Timing Adjustment Switch CKT Malfunction

  1. Locate test connector next to coolant recovery bottle. Ensure test connector terminals are not grounded or jumpered. Repair as necessary. If test connector is okay, go to next step.
  2. Turn ignition on. Measure voltage between test switch terminal (Blue/Red wire) in monitor coupler and ground. If voltage is 10-14 volts, problem is intermittent or due to a faulty PCM. If voltage is not as specified, go to next step.
  3. Turn ignition off. Disconnect PCM connectors. Using a DVOM, check resistance between monitor coupler terminal No. 5 and ground. If no continuity exists, replace PCM and retest system. If continuity exists, repair Blue/Red wire for short to ground and retest system.
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