Dtc P1870 Transmission Component Slipping - Isuzu 1999 RODEO Workshop Manual

7A1–86 TRANSMISSION CONTROL SYSTEM (4L30–E)

DTC P1870 Transmission Component Slipping

Circuit Description
The PCM monitors the difference in engine speed and
transmission output speed. In D3 drive range with the
TCC engaged, the engine speed should closely match
transmission output speed.
This DTC detects excessive TCC slip when the TCC is
engaged. This is a type "B" DTC.
Conditions For Setting The DTC
The following conditions are met for three TCC cycles
with reported excessive TCC slip conditions.
f No TP DTCs P0122 or P0123.
f No OSS DTCs P0722 or P0723.
f No shift solenoid A DTCs P0751 or P0753.
f No shift solenoid B DTCs P0756 or P0758.
f No TCC PWM solenoid DTC P1860.
f No TCC solenoid DTC P0742.
f Engine speed is between 800 and 3,360 rpm.
f Engine vacuum is between 0 and 70 kPa.
f Gear range is D4.
f TP angle is between 12 and 70%.
f TFT is between 20° and 141°C (68° and 286°F).
f TCC is "on" for 3 seconds.
f TCC slip speed is between 200 rpm and 800 rpm for
10 seconds.
f Vehicle speed is between 38 km/h (24 mph) and 110
km/h (69 mph).
f Speed ratio is between 0.6 and 0.95.
f No MAP DTCs P0106 or P1106 or P0107 or P1107 or
P0108.
Action Taken When The DTC Sets
f Only stored in memory.
f The PCM will illuminate the Malfunction Indicator
Lamp (MIL) and CHECK TRANS Lamp.
Conditions For Clearing The MIL/DTC
f The PCM will turn off the MIL and CHECK TRANS
Lamp after three consecutive ignition cycles without a
failure reported.
f The DTC can be cleared from the PCM history by
using a scan tool.
f The DTC will be cleared from history when the vehicle
has achieved 40 warmup cycles without a failure
reported.
f The PCM will cancel the DTC default actions when
the fault no longer exists and the ignition is cycled "off"
long enough to power down the PCM.
Diagnostic Aids
f Range switch malfunction could set a DTC P1870.
f A mechanical failure of the shift solenoids, TCC
solenoid, or TCC PWM solenoid could set a DTC
P1870.
f Internal transmission failures may set a DTC P1870.
D07RW023