Chart C-1A, Electrical Load Idle-Up Diode Circuit Check: Notes

ECM/PCM receives an idle-up signal from electrical load idle-up diode. This signal is present whenever one or more of the following systems is turned or operated.

• Parklights.
• Rear window defogger.
  NOTE: Test numbers refer to numbers on diagnostic chart.

1. Checks for electrical load idle-up signal to ECM/PCM.
2. Checks for open or short to voltage in Black wire, or faulty ECM/PCM or electrical load idle-up diode.