Chart C1-A Electrical Load Idle-Up Diode Circuit Check

Diagnostic Chart:

Electrical Load Idle-Up Diode Circuit:

ELECTRICAL LOAD IDLE-UP DIODE CIRCUIT CHECK

Circuit Description:
The engine control module (ECM)/powertrain control module (PCM) receives an idle-up signal from the electrical load idle-up diode. This signal is present when one or more of the following systems is turned on or operated.

^ Park Lamps

^ Rear Defogger

Test Description: Numbers below refer to circled numbers on the diagnostic chart.

1. Checks for electrical load idle-up signal to ECM/PCM.

2. Checks for an open or a short to voltage in BLK wire, a faulty electrical load idle-up diode or a faulty ECM/PCM.

Diagnostic Aids:
An intermittent may be caused by a poor connection, rubbed through wire insulation or a wire broken inside the insulation. Inspect the harness connector for backed out terminals, improper mating, broken lock, improperly formed or damaged terminals and for poor terminal-to-wire connection before component replacement.