Allison Transmission Motorhome Series Operator's Manual page 80

Code Listings And Procedures
(Allison 4
P0880, P0881,
P0882, P0883
TCM Power
Input Signal
Fault
P0894
Transmission
Component
Slipping
P0960, P0964,
P0968, P2727,
P2736, P2761
Pressure
Control
Solenoid
Circuit Open
P0962, P0965,
P0970, P2720,
P2729, P2738,
P2764
Pressure
Control
Solenoid
Circuit Low
P0963, P0966,
P0971, P2721,
P2730, P2739,
P2763
Pressure
Control
Solenoid
Circuit High
th
Generation Controls) (cont'd)
1. Check:
a. Battery direct ground and power connections are
tight and clean.
b. Vehicle batteries are charged.
c. Vehicle charging system is not over- or
under-charging.
d. VIM fuse is good.
e. VIM connections are tight, clean, and undamaged.
f. Vehicle manufacturer supplied wiring is correct.
g. TCM connection is tight, clean, and undamaged.
1. Let the vehicle idle with the parking brake applied,
wheels chocked, and vehicle level. Check:
a. Correct dipstick is installed.
b. Fluid level is correct.
1. Check:
a. Main transmission connector is tight, clean, and
undamaged.
b. TCM connector is tight, clean, and undamaged.
c. Wiring harness has no opens.
1. Check:
a. Main transmission connector is tight, clean, and
undamaged.
b. TCM connector is tight, clean, and undamaged.
c. Wiring harness has no shorts-between-wires or
shorts-to-ground.
1. Check:
a. Main transmission connector is tight, clean, and
undamaged.
b. TCM connector is tight, clean, and undamaged.
c. Wiring harness has no shorts-between-wires.
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