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P1639 Diagnostic Trouble Code Discussion for August 2005

5-Volt Reference 'B' Circuit Malfunction

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Trouble Ticket Help Requests for DTC P1639
Help Request Posted
2000 Isuzu Rodeo LS 3.2L No Start, Stall, MIL Lamp on VIN: 4S2DM58W9Y
P1639: 5-Volt Reference Voltage 'B' Circuit Malfunction. We have this rodeo that will shut off and fail to restart for about 20 minutes every time it is run for about 10 minutes and gets hot. The reference voltage for tps #2 and aps #2 drops to about 280mv when this happens. When the 5 volt reference returns the veh...
August 03, 2005