Vehicle Speed Sensor

[slipknot09]

Honestly the tech2 can’t display 10% of the available information that these cars actually have available. Here are some PIDS you can enter into Torque to find out whether the ECM is even issuing the commands to the gearbox

Upshift Requested	Up Req	22192301	lookup(bit(A:0)::1='ON':0='OFF')
Upshift in Progress	Upshift	22192301	lookup(bit(A:1)::1='ON':0='OFF')
Upshift Desired	Upshift Des	22192301	lookup(bit(A:2)::1='ON':0='OFF')
Downshift Requested	Downshift Req	22192301	lookup(bit(A:3)::1='ON':0='OFF')
Downshift in Progress	Downshift	22192301	lookup(bit(A:4)::1='ON':0='OFF')
Downshift Desired	Downshift Des	22192301	lookup(bit(A:5)::1='ON':0='OFF')
3-2 Downshift Started	3-2 start	22192301	lookup(bit(A:6)::1='ON':0='OFF')
1923-7: 3-2 Downshift in Progress	3-2 shifting	22192301	lookup(bit(A:7)::1='ON':0='OFF')

Using AUTO as header should work fine, setting to 7E0 will get responses maybe 50ms quicker but not required or even noticeable unless logging.
Other PIDS which may help diagnose what sensor is playing up would be

Transmission Input Shaft Speed	Trans Input	22194101	((A*256)+B)*0.125	0	8000	RPM
Transmission Output Shaft Speed	Trans Output	22194201	((A*256)+B)*0.125	0	8000	RPM
TCC PWM Duty Cycle	TCC PWM	22197001	A/2.55	0	100	%
TCC PWM Active	TCC PWM T	22197001	LOOKUP(A::0='OFF':1~255=A/2.55)	0	100	%
PC Solenoid Duty Cycle %	PCS %	22197201	(A*255)/100	0	100	%
TCC Slip Speed	TCC Slip	22199101	((A*256)+B)/8	0	10000	RPM
Shift Time Error for Latest Shift	Shift.Error	22199601	A/40	0	70	Seconds
1 - 2 Shift Error	Shft 1-2 E	22199701	A/40	0	70	Seconds
2 - 3 Shift Error	Shft 2-3 E	22199801	A/40	0	70	Seconds
3 - 4 Shift Error	Shft 3-4 E	22199901	A/40	0	70	Seconds
Current Gear	Gear	22199A01	A	0	4	Gear
Variable Bleed Solenoid Pressure	VBS.Pres	22199D01	A	0	90	Psi
Pressure Control Solenoid Actual Current	PC.Sol.Cur	22199E01	A*0.0195	0	1.2	Amps
Pressure Control Solenoid Desired Current	PC.Sol.Ref	22199F01	A*0.0195	0	1.2	Amps
Shift Delay	Shift Delay	2219A001	A	0	70	Seconds
TCC Apply Time	TCCApplyTime	2219FF01	A/40	0	6	Secs
Speed Ratio	SpeedRatio	221A0201	((A*256)+B)	0	2500	:1
TCC Mode	TCCMode	221A1301	A	0	4
Trans Range switch
Park	PARK	22111301	lookup(bit(A:0)::1='ON':0='OFF')
Reverse	REVERSE	22111301	lookup(bit(A:1)::1='ON':0='OFF')
Neutral	NEUTRAL	22111301	lookup(bit(A:2)::1='ON':0='OFF')
Drive	DRIVE	22111301	lookup(bit(A:3)::1='ON':0='OFF')
Third	THIRD	22111301	lookup(bit(A:4)::1='ON':0='OFF')
Second	SECOND	22111301	lookup(bit(A:5)::1='ON':0='OFF')
First	FIRST	22111301	lookup(bit(A:6)::1='ON':0='OFF')
Invalid	Invalid	22111301	lookup(bit(A:7)::1='ON':0='OFF')
Trans Fluid Pressure switches
1st Gear	FIRST	22192101	lookup(bit(A:0)::1='1':0='OFF')
2nd	SECOND	22192101	lookup(bit(A:1)::1='2':0='OFF')
3rd	THIRD	22192101	lookup(bit(A:2)::1='3':0='OFF')
Drive	DRIVE	22192101	lookup(bit(A:3)::1='D':0='OFF')
Rev	REVERSE	22192101	lookup(bit(A:5)::1='R':0='OFF')
Park/Neutral	P/N	22192101	lookup(bit(A:6)::1='P/N':0='OFF')

These all should work fine, they do on my car and all GM cars of the same era if entered correctly into torque. Formulas will need adjusting to import into other apps.
I also have plenty more just for transmission but aren’t confident enough to share yet or haven’t tested enough.
I know you said you will probably just get it rebuilt but this may point you in the right direction. These may indicate your trans selector, trans fluid switch, Input shaft speed sensor, PC solenoid, Torque Convertor Clutch or even ECM may be the issue

 

[wannaeatyourbrains]

Thanks a lot, dude. I will have a play when the sun comes up. It is interesting. I did not even know you could do anything like this with Torque.

 

[wannaeatyourbrains]

Finally, we found what is wrong. My mate who rebuilt the transmission is a genius. The 12v output from the transmission control module was interrupted somewhere in the gel on the way out.

So he bridged it. Just put a direct line in. With an inline fuse, just in case.

As soon as he restored the power to the gearbox, Thunderbirds were go. No need for a new TCM, all good with the repair.

During the rebuild, he also found that one of the checkballs was stuck. I wonder how many people complaining about a clunky shift have theirs stuck.

Back to charging.