Dtc P0730 Transmission Incorrect Gear Ratio - Isuzu 1999 RODEO Workshop Manual

DTC P0730 Transmission Incorrect Gear Ratio

Circuit Description
f The Powertrain Control Module (PCM) calculates the
slippage of the converter and transmission based
upon the engine speed, the output speed, and the
current gear ratio.
f The slippage of the converter at a high enough engine
speed is low. The transmission should not slip more
than a given value when there is no shift.
f This DTC detects a slip at each gear. This is a type
"C" DTC.
Conditions For Setting The DTC
f No Output Speed Sensor DTC(s) P0722, P0723.
f Not in Park, Neutral or Reverse.
f Engine speed is greater than 3500 rpm.
f 3 seconds since upshift.
TRANSMISSION CONTROL SYSTEM (4L30–E)
f 3 seconds since downshift.
f 3 seconds since garage shift (N D).
f And one of the following conditions occur:
– Slip is greater than 753 rpm in 1st gear.
– Slip is greater than 713 rpm in 2nd gear.
– Slip is greater than 694 rpm on 3rd gear.
– Slip is greater than 685 rpm on 4th gear.
f All conditions met for 5.5 seconds.
Action Taken When The DTC Sets
f Maximum line pressure.
f The PCM will not illuminate the Malfunction Indicator
Lamp (MIL).
f The PCM will illuminate the CHECK TRANS Lamp.
7A1–57
D07RT015