you jave a biggie here.
here is some info
CIRCUIT DESCRIPTION The Powertrain Control Module
(PCM) monitors the difference between engine speed and transmission output speed. In D3 drive range with the
TCC engaged, the engine speed should closely match the transmission output speed. In D4 drive range, with the TCC engaged, the TCC slip speed should be
-20 to
+60 RPM .
When the
PCM detects excessive
TCC slip when the TCC should be engaged, then DTC P1870 sets. DTC P1870 is a type B DTC.
CONDITIONS FOR RUNNING THE DTC
- No TP sensor DTCs P0122 or P0123.
- No VSS assembly DTCs P0502 or P0503.
- No TCC solenoid valve DTC P0740.
- No 1-2 SS valve DTC P0753.
- No 2-3 SS valve DTC P0758.
- No 3-2 SS valve assembly DTC P0785.
- No TCC PWM solenoid valve DTC P1860.
- The engine is not in fuel cutoff.
- The engine torque is 40-400 lb ft .
- The TP angle is 12-50% .
- The vehicle speed is 56-112 km/h (35-70 mph ).
- The speed ratio is 0.64-0.95 (the speed ratio is the engine speed divided by the transmission output speed).
- The engine speed is 1500-3500 RPM .
- The gear range is D4.
- The commanded gear is not 1st gear
- The TFT is between 20-130°C (68-266°F) .
- The shift solenoid performance diagnostic counters are zero.
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