Allison Transmission Removal - PREVOST H3-41 Maintenance Manual

SECTION 07: TRANSMISSION
DTC
P2727 Pressure Control Solenoid 1 (PCS1) Control Circuit Open
P2729 Pressure Control Solenoid 1 (PCS1) Control Circuit Low
P2730 Pressure Control Solenoid 1 (PCS1) Control Circuit High
P2736 Pressure Control Solenoid 5 (PCS5) Control Circuit Open
P2738 Pressure Control Solenoid 5 (PCS5) Control Circuit Low
P2739 Pressure Control Solenoid 5 (PCS5) Control Circuit High
Retarder Oil Temperature Sensor Over Temperature
P273F
Condition
P2742 Retarder Oil Temperature Sensor Circuit – Low
P2743 Retarder Oil Temperature Sensor Circuit – High
P2761 TCC PCS Control Circuit Open
P2763 TCC PCS Control Circuit High
P2764 TCC PCS Control Circuit Low
Transmission Clutch Life Expired (Clutch Adaptive
P2789
Learning at Limit)
P2793 Gear Shift Direction Circuit
P2808 Pressure Control Solenoid 6 (PCS6) Stuck Off
P2809 Pressure Control Solenoid 6 (PCS6) Stuck On
P2812 Pressure Control Solenoid 6 (PCS6) Control Circuit Open
P2814 Pressure Control Solenoid 6 (PCS6) Control Circuit Low
P2815 Pressure Control Solenoid 6 (PCS6) Control Circuit High
U0073 CAN Communication Bus 1 Off
U0074 CAN Communication Bus 2 Off
U0100 Lost Communications with ECM A
Lost Communication with Gear Shift Module (Shift
U0103
Selector) 1
Lost Communication with Gear Shift Module (Shift
U0291
Selector) 2
U0304 Incompatible Gear Shift Module 1 (Shift Selector)
U0333 Incompatible Gear Shift Module 2 (Shift Selector)
Invalid Data Received From Gear Shift Module (Shift
U0404
Selector) 1
Invalid Data Received From Gear Shift Module (Shift
U0592
Selector) 2
7.

ALLISON TRANSMISSION REMOVAL

The following procedure deals with the removal of
the Allison transmission without removing the
power plant cradle from vehicle. The methods
used to support the transmission and engine
depend upon conditions and available equipment.
1. Select transmission's "NEUTRAL" positions,
apply parking brake, and then set battery
master switch to the "OFF" position.
2. Jack up vehicle, then place safety supports
underneath body.
26
PA1621 Maintenance Manual All Series | January 2017
Description
CHECK Inhibited Operation
Light
Yes DNS, SOL OFF (hydraulic default)
Yes DNS, SOL OFF (hydraulic default)
Yes DNS, SOL OFF (hydraulic default)
Yes Inhibit retarder operation
Allow 2 through 6, N, R. Inhibit
Yes
retarder and TCC operation
Yes Inhibit retarder operation
No None
No Use default retarder temp values
No Use default retarder temp values
Yes Inhibit TCC operation
Yes Inhibit TCC operation
7-speed: Allow 2 through 6, N, R.
Yes
Inhibit TCC operation
No None
Ignores PWM input from shift
Yes
selector
Yes DNS, RPR
Yes DNS, RPR
Yes DNS, SOL OFF (hydraulic default)
Yes DNS, SOL OFF (hydraulic default)
Yes DNS, SOL OFF (hydraulic default)
No Use default values
No Use default values
Yes Use default values
Maintain range selected, observe
Yes
gear shift direction circuit
Maintain range selected, observe
Yes
gear shift direction circuit
Yes Ignore shift selector inputs
Yes Ignore shift selector inputs
Maintain range selected, observe
Yes
gear shift direction circuit
Maintain range selected, observe
Yes
gear shift direction circuit
CAUTION
Only the recommended jacking points must be
used as outlined in Section 18, "BODY".
NOTE
For more clearance between the tag axle and
transmission, the tag axle may be unloaded and
jacked up or retracted (if applicable).
3. Remove engine splash guards and protective
panels surrounding transmission.
4. Remove cross
transmission.
5. Remove the transmission drain plug and allow
oil to drain. Inspect the drain plug washer and
Description
member from under