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Chevrolet Equinox Service Manual: Transmission Control Module Scan Tool Information (6T70/6T75) Transmission Control

Chevrolet Equinox Service Manual / Powertrain / Internal Combustion Powertrain Control / Transmission Control Module Scan Tool Information (6T70/6T75) Transmission Control

Table 1: Scan Tool Data Parameters
Table 2: Scan Tool Output Controls

The Transmission Control Module Scan Tool Data List containsall transmission related parameters that are available on the scantool. The list is arranged in alphabetical order. A given parametermay appear in any one of the data lists, and in some cases mayappear more than once, or in more than one data list in order togroup certain related parameters together.

The values below represent a typical display recorded from aproperly functioning system.

Only the parameters listed below are used/referenced in thismanual for diagnosis. If a scan tool displays other parameters,those values are not recommended by General Motors for use indiagnosis.

If all values are within the expected range described below,refer toSymptoms - Automatic Transmissionfor diagnosis.

The scan tool values from a properly functioning transmissionmay be used for comparison with the transmission you arediagnosing. The values below represent a typical display recordedfrom a properly functioning system.

Scan Tool Data Parameters

Parameter

System State

Expected Value

Description

Operating Conditions: Engine at idle,upper radiator hose hot, closed throttle, transmission in Park,closed loop operation, accessories OFF, brake pedal notapplied.

1–2 Shift Time

Seconds, Varies

This parameter displays the actual time of the last adaptable1–2 shift. The shift time is based on the gear ratiochange after the commanded 1–2 shift.

2–3 Shift Time

Seconds, Varies

This parameter displays the actual time of the last adaptable2–3 shift. The shift time is based on the gear ratiochange after the commanded 2–3 shift.

3–4 Shift Time

Seconds, Varies

This parameter displays the actual time of the last adaptable3–4 shift. The shift time is based on the gear ratiochange after the commanded 3–4 shift.

4–5 Shift Time

Seconds, Varies

This parameter displays the actual time of the last adaptable4–5 shift. The actual shift time is obtained by measuringthe time required for the input shaft to decelerate from theprevious ratio to the current ratio.

5–6 Shift Time

Seconds, Varies

This parameter displays the actual time of the last5–6 shift. The shift time is base on the gear ratiochange after the commanded 5–6 shift.

Brake Switch

Released

This parameter displays the status of the brake switchcircuit input. Applied indicates a zero voltage input, brake pedalapplied. Released indicates a voltage input, brake pedal released.The scan tool displays Applied or Released.

Calc. Throttle Position

%, Varies

This parameter displays a calculated value, which isdetermined by the accelerator pedal position and the actualthrottle position, used to optimize transmission controls. Itrepresents the driver’s intended request for torque oracceleration. The range is 0–100%, where 0% represents anidle or coast request and 100% represents a request for wide openthrottle (WOT).

Commanded Gear

1

This parameter displays the current commanded state of theshift solenoid valves. The scan tool displays 1, 2, 3, 4 or5

Driver Shift Control

Inactive

This parameter displays Active or Inactive. The scan tooldisplays Active when the gear selector is in thesport-(S) position, which enables TAP shift. The scantool displays Inactive when the gear selector is not in theS-position, TAP shift disabled.

Driver Shift Request

None

This parameter displays the current request from the TAPShift System. This parameter will display up shift, downshift orinvalid depending on the amount of voltage measured at the remoteshift selector input and also will display none when there is norequest.

ECT

°C (°F), Varies

This parameter displays the input signal from the enginecoolant temperature (ECT) sensor. ECT is high at 151°C(304°F) when the signal voltage is low (0-V).ECT is low at −40°C (−40°F)when the signal voltage is high (5-V).

Engine Speed

RPM, Varies

This parameter displays the rotational speed of the engineexpressed as revolutions per minute.

Engine Torque

Y, Varies

This parameter displays a calculated value based on engineload, throttle position, mass air flow, and other engine inputs.This parameter is accurate to within 15-lb-ftof actual measured engine torque.

Gear Ratio

Ratio, Varies

This parameter displays the actual transmission gear ratio.The scan tool displays the gear ratio calculated from the automatictransmission input shaft speed sensor (AT ISS) and the automatictransmission output shaft speed sensor (AT OSS) inputs.

High Side Driver-1

Enabled

This parameter displays the High Side Driver 1 status on thescan tool. When the High Side Driver 1 is commanded OFF thisdisplays Disabled, when the High Side Driver 1 is commanded ON thisdisplays Enabled.

High Side Driver-1 CKT Status

OK

This parameter displays the High Side Driver 1 circuit statuson the scan tool. If the voltage is low when the solenoid iscommanded OFF, the scan tool will display Open/Short to GND. If thevoltage is high when the solenoid is commanded ON, the scan toolwill display Short to Volts. If no circuit fault is present thescan tool will display OK.

Ignition Voltage

Volts, 12–14

This parameter displays the system voltage measured at theignition feed.

IMS

Park

This parameter displays PARK, PARK/REVERSE, REVERSE,REVERSE/NEUTRAL, NEUTRAL, NEUTRAL/DRIVE 4, DRIVE 4, DRIVE 4/DRIVE3, DRIVE 3, DRIVE 3/DRIVE 2, DRIVE 2, DRIVE 2/DRIVE 1, DRIVE 1 orINVALID. The IMS Range display represents a decoded status of thefour inputs from the IMS. The combination of IMS inputs are used todetermine what position the manual valve is in at any time.

IMS A/B/C/P

Varies

This parameter displays the status of the four A/B/C/P inputsfrom the automatic transmission internal mode switch. I indicatesan ignition voltage signal and LOW indicates a 0 voltage signal.The scan tool will display HI/LOW, HI/LOW, HI/LOW, HI/LOW.

ISS/OSS Supply Voltage

OK

This parameter displays OK, Out of Range.

Last Shift Time

Seconds, Varies

This parameter displays the actual time of the last up shift.This value is only accurate if the shift was adaptable.

Line PC Sol. Pressure Command

kPa (psi), Varies

This parameter displays kPa (psi).

PC Sol. 2 Pressure Command

kPa (psi), Varies

This parameter displays kPa (psi).

PC Sol. 3 Pressure Command

kPa (psi), Varies

This parameter displays kPa (psi).

PC Sol. 4 Pressure Command

kPa (psi), Varies

This parameter displays kPa (psi).

PC Sol. 5 Pressure Command

kPa (psi), Varies

This parameter displays kPa (psi).

Replicated OSS CKT Status

OK

This parameter displays OK, Open/Short to GND, Short toVolts, or Indeterminate.

Shift Sol. 1 CKT Status

OK

This parameter displays OK, Open/Short to GND, Short toVolts, or Indeterminate.

Shift Solenoid-1

On

This parameter displays the commanded state of the reverse,1st shift solenoid valve (S1). The scan tool displaysOn/Off.

Shift Sol. 2 CKT Status

OK

This parameter displays OK, Open/Short to GND, Short toVolts, or Indeterminate.

Shift Solenoid-2

On

This parameter displays the commanded state of the2–3, 3–4 shift solenoid valve (S2). The scantool displays On/Off.

TCC Slip Speed

RPM, Varies

This parameter displays the difference between transmissioninput speed and engine speed. A negative value indicates that theengine speed is less than the input speed, deceleration. A positivevalue indicates that the engine speed is greater than the inputspeed, acceleration. A value of zero indicates that the enginespeed is equal to the input speed, TCC applied.

TCM Temperature

°C (°F) Varies

This parameter displays results in °C(°F)

TFP Switch-1

HI/LOW

This parameter displays the state of the first clutch oilpressure switch. The scan tool displays HI/LOW.

TFP Switch-3

HI/LOW

This parameter displays state of the 3rd clutch oil pressureswitch. The scan tool displays HI/LOW.

TFP Switch-4

HI/LOW

This parameter displays state of the 4th clutch oil pressureswitch. The scan tool displays HI/LOW.

TFP Switch-5

HI/LOW

This parameter displays state of the fifth clutch oilpressure switch. The scan tool displays HI/LOW.

Trans. Fluid Temp.

°C (°F) Varies

This parameter displays the input signal of the transmissionfluid temperature sensor. Transmission fluid temperature is high151°C (304°F) when signal voltage is low,0-V, and transmission fluid temperature is low−40°C (−40°F ) when signalvoltage is high, 5-V.

Transmission ISS

RPM, Varies

This parameter displays the rotational speed of thetransmission input shaft. The scan tool displays input shaft speedis revolutions per minute (RPM).

Transmission OSS

RPM, Varies

This parameter displays the rotational speed of thetransmission output shaft expressed as revolutions perminute.

Scan Tool Output Controls

Output Control

Description

TCC Control Solenoid

The transmission control module-(TCM) commands thetorque converter clutch pressure control-(TCC PC)solenoid pressure in order to apply and release the TCC.When the ignition is ON, and the engine is OFF, there are nolimits to this control. The solenoid remains ON until commanded OFFand vice versa.When the engine is running, the following control limitsapply:If the transmission range is Park, and the transmission is inhot mode, the TCC PC solenoid may not be commanded OFF. If thesolenoid is requested OFF, the message "TCC OFF command disabled inHot Mode" appears on the scan tool display.The TCC PC solenoid may not be commanded OFF for more than acalibrated amount of time. If the solenoid is commanded OFF, for acertain amount of time, the message "TCC OFF time has beenexceeded" appears on the scan tool display.

Shift Solenoid

The TCM commands Shift Solenoid-1 and ShiftSolenoid-2 ON and OFF.When the ignition is ON, and the engine is OFF, there are nolimits to this control. The solenoid remains ON until commandedOFF, and vice versa. When the output control is exited, thesolenoid state is determined by the TCM.When the engine is running, the following control limitsapply:The transmission range must be in Park or Neutral. If thetransmission range is not Park or Neutral, the message "Enginerunning and transmission range is not Park/Neutral" appears on thescan tool display.The solenoid remains ON until commanded OFF, and vice versa.When the output control is exited, the solenoid state is determinedby the TCM.Transmission range DTCs must not be active. If a transmissionrange DTC is active, the message "Engine running with transmissionDTC present" appears on the scan tool display.

Line PC Solenoid

The scan tool is used to request pressure in increments of200-kPa (30-psi) from200–2200-kPa(30–320-psi). The TCM will then command thesolenoid to achieve a pressure within a range based on therequested pressure. Refer toSolenoid Valve Pressure.When the ignition is ON, and the engine is ON, the pressurerequest may be controlled within calibrated limits. There are nolimits to the output control when the engine is OFF.When the engine is running, the following control limitsapply:When the transmission range is Park or Neutral, the pressurerequest may be controlled within calibrated limits. The enginespeed must be less than 1,500-RPM. If the engine speedis greater than 1,500-RPM, the message "TR inpark/neutral and engine speed over 1,500-RPM" appears onthe scan tool display.When the transmission range is not Park or Neutral, therequested pressure can only be controlled equal to or greater thanthe pressure determined by the TCM. The TCM does not allow apressure to be selected that may cause damage to the transmission.If the requested pressure is less than allowed by the TCM, themessage "Requested pressure for the Line PC Solenoid is too low"appears on the scan tool display.Transmission range DTCs must not be active. If a transmissionrange DTC is active, the message "Engine running with transmissionDTC present" appears on the scan tool display.

Clutch PC Solenoids

The TCM commands the pressure control solenoids in order toapply and release the clutches.When the ignition is ON, and the engine is OFF, there are nolimits to this control. The solenoid remains ON until commandedOFF, and vice versa. When the output control is exited, thesolenoid state is determined by the TCM.When the engine is running, the following control limitsapply:The transmission range must be in Park or Neutral. If thetransmission range is not Park or Neutral, the message "Enginerunning and transmission range is not Park/Neutral" appears on thescan tool display.The solenoid remains ON until commanded OFF, and vice versa.When the output control is exited, the solenoid state is determinedby the TCM.Transmission range DTCs must not be active. If a transmissionrange DTC is active, the message "Engine running with transmissionDTC present" appears on the scan tool display.

Shift Transmission

The TCM commands upshifts and downshifts. The scan toolCommanded Gear parameter should correspond with the shift solenoidcombination. Refer to theShift Solenoid Valve State and Gear Ratiotable.When the ignition is ON, and the engine is OFF, there are nolimits to this control. The scan tool shift solenoid states changeto match the Commanded Gear selected.When the engine is running, the following control limitsapply:The TCM does not allow a shift if it causes the engine RPM toexceed a calibrated limit. If a gear is requested and the enginespeed is too high, the message “Engine speed toohigh” appears on the scan tool display.The TCM does not allow a 3–2 or 2–1downshift if the vehicle speed exceeds a calibrated limit. Ifeither downshift is requested and the vehicle speed is too high,the message “Eng. is on and veh. speed too hi for3–2 or 2–1 downshift” appears on thescan tool display.The TCM does not allow a 4–3 downshift if thevehicle speed exceeds a calibrated limit. If a 4–3downshift is requested and the vehicle speed is too high, themessage “Vehicle speed too high” appears on thescan tool display.The TCM does not allow an upshift if the vehicle speedexceeds a calibrated limit. If an upshift is requested and thevehicle speed is too high, the message “Vehicle speed toohigh” appears on the scan tool display.The TCM does not allow an upshift that is greater than thecurrent selected transmission range (PRNDL). For example, 3rd gearis not allowed if the transmission range is D2. If an upshift isrequested that is greater than the current selected transmissionrange, the message “Eng. running and gear request isgreater than the current TR” appears on the scan tooldisplay.

High Side Driver 1

The TCM commands the driver for the solenoid voltage supplyON and OFF.When the ignition is ON, and the engine is OFF, there are nolimits to this control.High side drivers may not be commanded ON and OFF with thescan tool if the engine is running.

Service Cleaning Procedure

The scan tool is used to start and stop the transmissioncleaning procedure algorithm.The following control limits apply:The engine must be running. The message “Engine notRunning” will appear on the scan tool if this control isattempted without the engine running.There cannot be active transmission DTCs. The message“Transmission Fault present” will appear on thescan tool if this control is attempted with transmission DTCsactive.The transmission range must be Park or Neutral. The message“Transmission not in PARK or NEUTRAL” willappear on the scan tool if this control is attempted with thetransmission in any range other than Park or Neutral.The vehicle speed cannot exceed 5 mph. The message“Vehicle Speed too high” will appear on thescan tool if this control is attempted with a vehicle speed greaterthan 8-km/h (5-mph).The engine speed cannot exceed 2500-RPM. Themessage “Engine Speed too high” will appear onthe scan tool if this control is attempted with an engine speedgreater than 2500-RPM.The transmission oil temperature must be at a normaloperating temperature. The message “Transmission oiltemperature out of range” will appear on the scan tool ifthis control is attempted without a transmission oil temperaturebetween 70–110°C(158–230°F).

Reset Transmission Adapts

The scan tool is used to start and stop the transmission FastLearn Adapt algorithm.The following control limits apply:The engine must be running. The message “Engine notRunning” will appear on the scan tool if this control isattempted without the engine running.There cannot be active transmission DTCs. The message“Transmission Fault present” will appear on thescan tool if this control is attempted with transmission DTCsactive.
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