CHECK FOR INTERMITTENT PROBLEMS HINT: Inspect the vehicle's ECM using check mode. Intermittent problems are easier to detect with the Techstream when the ECM is in check mode. In check mode, the ECM uses 1 trip detection logic, which is more sensitive to malfunctions than normal mode (default), which uses 2 trip detection logic.
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Toyota Tundra Service Manual > Generator: Inspection
INSPECTION PROCEDURE 1. INSPECT GENERATOR ROTOR ASSEMBLY (a) Check the rotor for an open circuit. (1) Measure the resistance according to the value(s) in the table below. Standard Resistance: 100 A Type Type Tester Connection Condition Specified Condition Slip ring - Slip ring 20°C (68°F) 2.3 to 2 ...