Transmission Inputs

TRANSMISSION RANGE SENSOR CHECK OPERATION

DTCs	P0705 invalid pattern for digital TRS P0706 Out of range signal frequency for PWM TRS P0707 Signal out of range low for PWM TRS P0708 Open circuit for digital TRS or signal out of range high for PWM TRS
Monitor Execution	Continuous
Monitor Sequence	None
Sensors OK
Monitoring Duration	Up to 30 seconds for pattern recognition, 5 seconds for analog faults

TYPICAL TRS CHECK ENTRY CONDITIONS

Auto Transmission Entry Conditions	Minimum	Maximum
Gear selector position	each position for up to 30 seconds	480 seconds

TYPICAL TRS MALFUNCTION THRESHOLDS

Digital TRS: Invalid pattern from 3 or 5 digital inputs and/or 1 analog circuit open for 5 seconds
4-bit digital TRS: Invalid pattern for 200 ms
Dual analog TRS:
Voltage > 4.84 volts or < 0.127 volts for 200 ms or
Sum of both inputs is outside the range of 5.0 volts +/- 0.29 volts for 200 ms
PWM TRS:
Frequency > 175 Hz or < 100 Hz,
Duty Cycle > 90% or < 10%
Dual PWM TRS : each signal tested for:
Frequency > 175 Hz or < 100 Hz (HF32); > 300 Hz or < 200 Hz (DPS6)
Duty Cycle > 90% or < 10%
Sum of both inputs = 100% +/- 4%

Most vehicle applications no longer have a standalone vehicle speed sensor input. The PCM sometimes obtains vehicle speed information from another module on the vehicle, i.e. ABS module. In most cases, however, vehicle speed is calculated in the PCM by using the transmission output shaft speed sensor signal and applying a conversion factor for axle ratio and tire programmed into the Vehicle ID block. A Vehicle Speed Output pin on the PCM provides the rest of the vehicle with the standard 8, 000 pulses/mile signal.

NOTE:

If the Vehicle ID block has not been programmed or has been programmed with an out-of-range (uncertified) tire/axle ratio, a P1639 DTC will be stored and the MIL will be illuminated immediately.

VEHICLE SPEED SENSOR FUNCTIONAL CHECK OPERATION

DTCs	P0500 - VSS Circuit
Monitor Execution	Continuous
Monitor Sequence	None
Sensors OK
Monitoring Duration	30 seconds

TYPICAL VSS FUNCTIONAL CHECK ENTRY CONDITIONS

Auto Transmission Entry Conditions	Minimum	Maximum
Gear selector position	drive
Engine rpm (above converter stall speed) OR	3000 rpm
Turbine shaft rpm (if available) OR	1500 rpm
Output shaft rpm	650 rpm
Vehicle speed (if available)	15 mph
Manual Transmission Entry Conditions	Minimum	Maximum
Engine load	50%
Engine rpm	2400 rpm

TYPICAL VSS FUNCTIONAL CHECK MALFUNCTION THRESHOLDS

Vehicle is inferred to be moving with positive driving torque and VSS is < 1 - 5 mph for 5 seconds

OUTPUT SHAFT SPEED SENSOR FUNCTIONAL CHECK OPERATION

DTCs	P0720 - OSS circuit P0721 - OSS range/performance -F-21, 6HP26 P0722 - OSS no signal P0723 - OSS intermittent/erratic - 6HP26
Monitor Execution	Continuous
Monitor Sequence	None
Sensors OK	TSS, Wheel Speed
Monitoring Duration	30 seconds

TYPICAL OSS FUNCTIONAL CHECK ENTRY CONDITIONS

Auto Transmission Entry Conditions	Minimum	Maximum
Gear selector position	drive
Engine rpm (above converter stall speed) OR	3000 rpm
Primary Pulley Speed (CFT30) OR	400 rpm
Turbine shaft rpm (if available) OR	1500 rpm
Output shaft rpm	300 - 650 rpm
Vehicle Speed (if available)	12.5 - 15 mph

TYPICAL OSS FUNCTIONAL CHECK MALFUNCTION THRESHOLDS

Circuit/no signal - vehicle is inferred to be moving with positive driving torque and OSS < 100 to 200 rpm for 5 to 30 seconds
6HP26 Circuit/no signal: open or short circuit for > 0.6 seconds
6HP Range/Performance: > 200 rpm difference between OSS and wheel speed and > 250 rpm difference between OSS and input shaft speed
F21 Range/Performance: TSS, ABS wheel speed and engine rpm correlate properly, but OSS error is greater than 15% for 10 seconds
CFT30 Range/Performance: ABS wheel speed indicates a 6.24 mph difference with OSS calculated wheel speed
6HP26 Intermittent/Erratic: > -1000 rpm instantaneous change with locked torque converter clutch
CFT30 Intermittent/Erratic: > 6000 rpm/sec change

INTERMEDIATE SHAFT SPEED SENSOR FUNCTIONAL CHECK OPERATION

DTCs	P0791 - ISS circuit
Monitor Execution	Continuous
Monitor Sequence	None
Sensors OK
Monitoring Duration	30 seconds

TYPICAL ISS FUNCTIONAL CHECK ENTRY CONDITIONS

Auto Transmission Entry Conditions	Minimum	Maximum
Gear selector position	drive
Engine rpm (above converter stall speed) OR	3000 rpm
Turbine shaft rpm (if available) OR	1500 rpm
Output shaft rpm	650 rpm
Vehicle speed (if available)	15 mph

TYPICAL ISS FUNCTIONAL CHECK MALFUNCTION THRESHOLDS

Vehicle is inferred to be moving with positive driving torque and ISS < 250 rpm for 5 seconds

TURBINE SHAFT SPEED SENSOR FUNCTIONAL CHECK OPERATION

DTCs	P0715 - TSS circuit/ no signal P0718 - TSS erratic signal
Monitor Execution	Continuous
Monitor Sequence	None
Sensors OK	OSS, Wheel Speed
Monitoring Duration	30 seconds

TYPICAL TSS FUNCTIONAL CHECK ENTRY CONDITIONS

Auto Transmission Entry Conditions	Minimum	Maximum
Gear selector position	Forward range
Engine rpm (above converter stall speed) OR	3000 rpm
Output shaft rpm OR	600 - 650 rpm
Vehicle speed (if available)	12.5 - 15 mph

TYPICAL TSS FUNCTIONAL CHECK MALFUNCTION THRESHOLDS

Circuit/no signal - vehicle is inferred to be moving with positive driving torque and TSS < 200 rpm for 5 - 30 seconds
Erratic signal - observe 200 turbine speed spikes > 400 rpm with no more than 1.5 seconds between spikes

TRANSMISSION FLUID TEMPERATURE SENSOR FUNCTIONAL CHECK OPERATION

DTCs	P0711 - in range failure P0712 - short to ground P0713 - open circuit
Monitor Execution	Continuous
Monitor Sequence	None
Sensors OK	ECT substituted if TFT has malfunction TFT inferred from pressure solenoid on CFT30
Monitoring Duration	5 seconds for electrical, 600 seconds for functional check

TYPICAL TFT STUCK LOW/HIGH CHECK ENTRY CONDITIONS

Auto Transmission Entry Conditions	Minimum	Maximum
Engine Coolant Temp (hot or cold, not midrange)	> 100 °F	< 20 °F
Time in Run Mode	500 - 600 seconds
Time in gear, Vehicle moving, Positive torque	150 seconds
Vehicle Speed	15 mph
Time with engine off (cold start) OR	420 min
Engine Coolant Temp AND Trans Fluid Temp (inferred cold start)		122 °F

TYPICAL TFT MALFUNCTION THRESHOLDS

Opens/shorts: TFT voltage <0.05 or > 4.6 volts for 5 - 12 seconds
TFT Stuck low/high, i.e. TFT stuck at high temperature or stuck at low temperature):
Stores a fault code if TFT stabilizes (stops increasing if temperature < 70 deg F, stops decreasing if temperature > 225 deg F) before reaching the temperature region where all MIL tests are enabled (70 to 225 deg F). If TFT remains constant (+/- 2 deg F) for approximately 2.5 minutes of vehicle driving outside the 70 to 225 deg F zone a P0711 fault code will be stored. Old logic used to indicate a "pass" for a single delta, and not test until the normal operating region (70-225 deg F) was reached.