20. Vehicle Does Not Decelerate By Engine
Brake
SYMPTOM:
Vehicle does not decelerate by engine brake when shifting
from 2
2
(1
2
) to 1
1
.
Is 6. Vehicle Does Not Creep Backward In
“R” Position OK?
Yes
E
No
Go to 6. Vehicle Does Not
Creep Backward In “R”
Position, AT-166.
Go to 15. Engine Speed Does Not Return
To Idle (Light Braking D
4
,
D
3
), AT-174.
SAT557IA
21. TCM Self-diagnosis Does Not Activate
(Park/Neutral Position, Overdrive Control and
Throttle Position Switch Circuit Checks)
SAT558I
SAT559I
SYMPTOM:
O/D OFF indicator lamp does not come on in TCM self-diag-
nostic procedure even the lamp circuit is good.
DESCRIPTION
I
PNP switch
The PNP switch assemble includes a transmission range
switch. The transmission range switch detects the selector
position and sends a signal to the TCM.
I
Overdrive control switch
Detects the overdrive control switch position (“ON” or “OFF”)
and sends a signal to the TCM.
I
Throttle position switch
Consists of a wide open throttle position switch and a closed
throttle position switch.
The wide open throttle position switch sends a signal to the
TCM when the throttle valve is open at least 1/2 of the full
throttle position. The closed throttle position switch sends a
signal to the TCM when the throttle valve is fully closed.
GI
MA
EM
LC
EC
FE
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
H
AT-177