TM-9-2320-280-20-1
TRUCK, UTILITY: M998 SERIES
TECHNICAL MANUAL; UNIT MAINTENANCE; VOLUME 1 OF 3
JANUARY 1996
TM-9-2320-280-20-1 - Page 541 of 888
DIAGNOSTIC FLOWCHART
TRANSMISSION SYSTEM
(4L80-E)
TM 9-2320-280-20-1
Change 1
2 - 4 3 7
TRANSMISSION OUTPUT SPEED
SENSOR (TOSS) CIRCUIT
NOT E
If reading from J1 diagnostics chart is greater than 2, perform high
resistance - less than 1 perform low resistance.
Disconnect and check continuity of wire 495A
on J1 pin S to transmission output speed
connector pin A, and check continuity of wire
498A on J1 pin R to transmission output
speed connector pin B.
Check continuity of transmission output
speed sensor and pins A and B (TOSS)
1 Kohm to 2 Kohms
Ω
.
Repair pin(s) or connector,
(para. 4-85)
Replace TOSS,
(para. 4-46).
Repair wire 497A,
and/or wire 498A,
(para. 4-85).
Repair wire 497A/498A,
(para. 4-85).
Replace TOSS,
(para. 4-46).
Check transmission output speed sensor
connector and pins for continuity.
Disconnect TOSS and check continuity between
pins M and N at J1.
NO
NO
YES
YES
END
END
NO
NO
497A
498A
HIGH RESISTANCE
LOW RESISTANCE
YES
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