The MIL was on in this Tundra pickup, and we pulled a manufacturer-specific transmission code from it:
4/12/2009 15:37:38 Toyota Tundra 2005 MIL: On P2716 Pressure Control Solenoid 'D' Electrical Freeze Frame (Frame 0) for DTC P2716 Absolute Evaporative System Vapor Pressure: 100 % Absolute Load Value: 32 % Absolute Throttle Position D: 25 % Absolute Throttle Position E: 41 % Absolute Throttle Position: 21 % Air Flow Rate From Mass Air Flow Sensor: 2.75 lb/min B1S2 O2 Sensor Output Voltage: 0.800 V B2S2 O2 Sensor Output Voltage: 0.780 V Calculated Load: 31 % Commanded Equivalence Ratio: 1.002 Lam Commanded Throttle Actuator Control: 21 % Control Module Voltage: 13.85 V Coolant Temperature: 187 F Engine RPM: 1410 r/min Fuel System Status Bank One: Closed Loop Fuel System Status Bank Two: Closed Loop Ignition Timing Advance for #1: 25.5 deg Intake Air Temperature: 50 F Long Term Fuel Trim Bank One: 4.68 % Long Term Fuel Trim Bank Two: 3.90 % Relative Throttle Position: 5 % Short Term Fuel Trim Bank One: 0.00 % Short Term Fuel Trim Bank Two: 0.00 % Vehicle Speed: 37 MPHThe problem had evidently occurred while the truck was being driven around, and had been out for a while [up to full running temp]. Charging circuit was good, holding at 13.8+ volts; load was fairly light and the fuel trims and a/f look healthy.
The service manual led us right to the problem area: open or short in a solenoid drive circuit, from the ECM to the electronically-controlled automatic transmission. Right away I thought "bad wire or connector".
The connector seems designed with the intent of keeping splash out of it, since it's right there exposed to everything thrown up from the road, so I'm not sure how water got in [if that's even the cause]. Perhaps the little gasket around the wire where it comes into the outer connector leaked, letting the infamous New England winter salt-solution seep down into there.
_H* 090412