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DTC P1510 - Pcm Backup Power Supply Malfunction

  1. Turn ignition on. Using a voltmeter, measure voltage (backprobe) between ground and PCM harness connector "A", terminal No. 14 (White wire). If reading is 10-14 volts, check for poor connections at PCM. If connections are okay, replace PCM. If reading is not as specified, check for blown TAIL fuse (15-amp) or blown MAIN fuse (60-amp). If fuses are okay, go to next step. If fuses are blown, check for short circuit and repair as necessary. Retest system.
  2. Check for open in White wire between PCM and fuse box. Check for open in White/Yellow wire between fuse box in passenger compartment and relay/fuse box in engine compartment. Repair as necessary. If wires are okay, check for an intermittent problem. See appropriate ADJUSTMENTS - 1.8L article. If idle speed and IAC duty are within specifications, go to step 3). If idle speed is high and IAC duty is low, or idle speed is low and IAC duty is high, go to next step. If idle speed and IAC duty are high, or idle speed and IAC duty are low, replace PCM. Retest system.
  3. Adjust idle speed and IAC duty. If adjustments can be made with idle air adjusting screw, go to next step. If adjustments cannot be made with idle air adjusting screw, go to step 4).
  4. If idle speed remains within specification as headlights are turned on, check for an intermittent problem. See appropriate TESTS W/O CODES article.
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