COMPUSHIFT II Manual – COMPUSHIFT II Manual
Diagnostics & Troubleshooting– 75
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Different transmissions uses different numbers of solenoid drivers for different functions. You can refer to the
Connector Pinouts(see page 101) charts for an exact explanation of which driver runs which solenoid.
6.2.2 TPS Signal Low
This fault indicates a TPS signal less than that allowed by the current calibration. This can indicate faulty wiring,
incorrect calibration, or a faulty TPS. In some cases, this can also be caused by cable slippage or an incorrect initial
calibration.
Repeat the calibration procedure before attempting other diagnostics.
6.2.3 TPS Signal High
This fault indicates a TPS signal greater than that allowed by the current calibration. This can indicate faulty wiring,
incorrect calibration, or a faulty TPS. In some cases, this can also be caused by an incorrect initial calibration.
Repeat the calibration procedure before attempting other diagnostics.
6.2.4 Both TPS Signal Low & TPS Signal High
If both the "TPS Signal High" and "TPS Signal Low" codes are indicated immediately after power is applied to
COMPUSHIFT II, this indicates a lack of valid TPS calibration.
You must calibrate the TPS by following the instructions in Checkout and Testing(see page 42).
The TPS sensor must move through at least a quarter of its full stroke to calibrate properly.
6.2.5 Transmission Temp Sensor
Indicates COMPUSHIFT II has received a temperature signal from the transmission that's out of the sensor's
possible operating range, and it usually means the sensor has failed, or the wiring is faulty.
COMPUSHIFT II may also temporarily disconnect that solenoid from the circuit.
COMPUSHIFT II generally comes from the factory without TPS calibration, so these codes will appear as
factory defaults prior to the first calibration. Also, if you reset COMPUSHIFT II using the optional Display,
these codes will revert to factory defaults. (As a failsafe, when TPS is not calibrated, COMPUSHIFT II uses a
constant value of 50% throttle.)
In order to preserve shift quality, COMPUSHIFT II must have an accurate measurement of your
transmission's temperature.
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