DTC P1530: Ignition Timing Adjustment Switch Circuit Malfunction
Ensure test switch terminal of test connector (located in relay/fuse box) is not grounded by a jumper wire. See Fig 1 . Remove jumper wire if necessary. Turn ignition on. Using a voltmeter, measure voltage between ground and terminal "E" of test connector. If reading is 10-14 volts, check for an intermittent problem. See TESTS W/O CODES article. If reading is not as specified, check Purple/White wire for short to ground. Repair as necessary. If wire is okay, replace PCM. Retest system.