Service Bay - Vehicle State No. 2

Vehicle state No. 2 is functional ONLY when the engine is running and the vehicle gear selector is in PARK or NEUTRAL with engine speed greater than 1,100 RPM. Vehicle state No. 2 is required when using output state control to carry out a line pressure check. Most, but not all, of the solenoids may be controlled during this vehicle state. It is recommended to use vehicle state No. 1 when using output state control to control the solenoids. The following transaxle function and components may be controlled using output state control in vehicle state No. 2.

LINEDSD - Output state control function to command line pressure to a desired pressure
SSD_AMP - Controls the current to SSD, VFS
SSC_AMP - Controls the current to SSC, VFS
SSB_AMP - Controls the current to SSB, VFS
SSA_AMP - Controls the current to SSA, VFS

The vehicle requirements must be met when sending an output state control value to control each specific component such as the solenoids stated above. If the vehicle requirements are not met when sending the output state control value, an error message may appear. When the error message appears, output state control is cancelled and should be restarted.

After sending the output state control value, if the vehicle requirements are no longer met, the error message will not appear but the output state control value will be cancelled by the PCM. Use the scan tool to monitor the PID that corresponds to each output state control function or component to determine if the PCM is using the output state control value or normal control.

Output state control may be cancelled at any time, using the scan tool, to return the PCM to normal control for a specific output state control function or component. See instructions for specific scan tool.

Output state control values for SSA_AMP, SSB_AMP, SSC_AMP, SSD_AMP, PCA AMP and TCC AMP to control the current on the VFS are between zero (0) and one (1) amp. The following are examples.

0 - Commands PCM to control current to zero amps
0.25 - Commands PCM to control current to 1/4 amp or 250 milli-amps
0.50 - Commands PCM to control current to 1/2 amp or 500 milli-amps
0.75 - Commands PCM to control current to 3/4 amp or 750 milli-amps
1 - Commands PCM to control current to 1 amp or 1,000 milli-amps

Output state control will aid in testing the electronic functions of the PCM, VFS and associated circuitry. Output state control allows the technician to control the PCM commanded current of the VFS and the commanded state of the on/off solenoid. This allows the technician to accurately test the electronic circuitry by comparing the commanded current with the actual current or the on/off state with the actual voltage. Shifting the transmission through the various gears tests the mechanical operation of the VFS. When using output state control to control the VFS current, the technician may measure the circuit current using an inductive pickup or measure the circuit voltage drop to help verify the proper electrical operation of each VFS solenoid.

The output state control values for LINEDSD to command a desired line pressure are between 414 kPa (60 psi) and 1,931 kPa (280 psi). The following are examples.

60 psi - Commands PCM to control line pressure to 414 kPa (60 psi)
100 psi - Commands PCM to control line pressure to 689 kPa (100 psi)
150 psi - Commands PCM to control line pressure to 965 kPa (150 psi)
200 psi - Commands PCM to control line pressure to 1,517 kPa (200 psi)

NOTE: Do NOT command line pressure LOWER than 414 kPa (60 psi) or HIGHER than 1,931 kPa (280 psi) or damage to the transaxle can occur.

Output state control allows the technician to control the PCM commanded Line Pressure. This allows the technician to accurately test the electronic pressure control system by comparing the output state control commanded line pressure to the actual line pressure indicated on the pressure gauge. The pressure gauge should be connected to the line pressure tap on the transmission. The PID corresponding to the commanded Line Pressure must be monitored to make sure the PCM is using the output state control value for the commanded Line Pressure. This test will help verify the correct operation of the transmission pump assembly, pump regulator valve and the operation of the LPC solenoid.