Transmission and Cruise Control Parameters

NOTE: These parameters indicate Powertrain Control Module (PCM) commands to, and signals from, various actuators and sensors in the transmission and the cruise control system.

SHIFT INDICATOR LAMP
NOTE: Used only on manual transmision vehicles.
SHIFT IND LAMP - XXX RANGE: ON - OFF

This parameter is an output command from the PCM to the instrument panel lamp. The PCM determines whether the lamp should light based on engine and vehicle speeds and engine load. SHIFT IND LAMP ON means that the SHIFT lamp on the panel should be lit. If it is not, there is a problem in the lamp circuit or with the PCM command.

SHIFT LEVER POSITION
SHIFT LEVER - XXXXX RANGE: P-N-/-R-D-L

The park/neutral switch provides a discrete parameter that indicates whether an automatic transmission is in park or neutral or in one of the drive ranges. The SHIFT LEVER display should read P-N- if the transmission is in either park or neutral. It should read -R-DL if the transmission is in any forward gear or reverse.

TORQUE CONVERTER LOCK-UP SOLENOID
LOCKUP SOL - XXX RANGE: ON - OFF

This discrete parameter indicates that the PCM has enabled the torque converter lockup clutch to engage. Torque converter lockup depends on gear selection, speed, engine temperature, and throttle position. LOCKUP SOL ___ON means that the PCM has completed one side of the circuit that energizes the solenoid.

The circuit also must be completed by various transmission, speed, and brake switches to open the transmission hydraulic line and engage the lockup clutch. This parameter indicates that the PCM command has been given. It is not a feedback signal to indicate that the clutch has actually engaged.

CRUISE CONTROL SWITCH POSITION (WHEN EQUIPPED)
CRUISE CNTRL - XXXXX RANGE: ON - OFF - SET - RESUME
This discrete parameter indicates the position of the cruise control switch to the PCM. Vehicles without cruise control continuously display this parameter as OFF.

CRUISE CONTROL TARGET SPEED
CC TARGET (MPH) - XXX
RANGE: 0 to VEHICLE MAXIMUM
CC TARGET (KPH) - XXX

This parameter on some indicates the speed at which the cruise control is set by the driver. You can change the measurement units on the scanner from MPH to KPH. the preset value is MPH.

CRUISE CONTROL STATUS INDICATORS
CC LAMP - XXX
RANGE: ON - OFF
CC POWER RELAY - XXX

CC LAMP indicates the status of the signal to the cruise control (CC) lamp. POWER RELAY indicates the status of the signal to the relay that provides battery voltage to the speed control servo solenoids. Both parameters should read ON when cruise control is enabled.

CRUISE CONTROL SWITCH INPUT
CC SW INPUT(V) - X.X RANGE: 0 to 5.1 volts

This parameter displays the cruise control switch analog voltage.

BRAKE SWITCH
BRAKE - XXX RANGE: ON - OFF

The brake switch used with cruise control provides an input signal to the PCM. The brake switch contacts that signal the PCM for cruise control and torque converter clutch operation are normally closed. When the brake pedal is depressed, the PCM receives a high-voltage, open-circuit signal and disengages the cruise control. BRAKE should read ON when the brake pedal is depressed; OFF at all other times.

CRUISE CONTROL SOLENOIDS
CC VAC SOL - xxxx
RANGE: OPEN - CLAST
CC VENT SOL - xxxx

The PCM sends output commands to CC vacuum and vent solenoids to control the cruise control servo. The CC VAC SOL and CC VENT SOL readings should read ON whenever the solenoids are energized to increase or to vent vacuum.

The CC VAC SOL and CC VENT SOL readings usually have the following relationships with throttle position control:

CC VAC SOL CC VENT SOL THROTTLE POSITION

ON OFF Accelerate

ON or OFF ON Decelerate

OFF OFF Steady