1) Observe Preparation for Test, see 22.
2) If DTC is displayed, it may be attributable to previous repair work done on the vehicle. For example, the valve block connector (Y3/1x1) on the transmission was not connected/reconnected while the engine was idling > 1000 rpm.
Clear DTC by using impulse counter scan tool. Start engine and idle at > 1000 rpm for approximately 10 seconds, check DTC with impulse counter scan tool, if DTC reappears 23 9.0.