Isuzu 1999 RODEO Workshop Manual page 872

RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION 6E1–245
times. After the vehicle is brought into a warm shop for
repairs, the valve warms and the problem disappears. By
watching the Actual EGR and Desired EGR Positions on
a cold vehicle with a Tech 2, the fault can be verified
easily. Check the freeze frame data to determine if the
Diagnostic Trouble Code set when the vehicle was cold
by viewing the Engine Coolant Temperature (EGR).