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6270A
Service Manual
When the module bay door is opened, the system vents and releases the supply
pressure. There may be a small residual pressure retained between solenoids IS
and CS, see Figure 1. This pressure could be up to150 psi after the supply is
removed. Loosen the PCM screws to safely release this pressure.
Table 2 shows the typical state of solenoids in Figure 1 during different operating
conditions. There are additional states as the system transitions between various
operational modes.
The status of the measure slot solenoids is dependent on the type of
module. For example, if the PMM is an absolute model then the test
port solenoids (nT) opens and the reference port solenoid (nR)
closes since inside the module there is no connection to the
reference port.
6270A
B1-
Phase
1T
Power Off
C
Power On
C
Measure Slot 1*
O
Measure Slot 2*
C
Measure Slot 3*
C
Measure Slot 4*
C
Measure Slot 5*
C
Control Apply
pd
Control Exhaust
pd
Zero
O
Vent - final state
O
Door open final
state
O
Slot PCM - Empty
C
*O = OPEN, C = CLOSED, pd = product configuration dependent
12
Main Manifold
G1-
B2-
G2-
B3-
G3-
1R
2T
2R
3T
3R
C
C
C
C
C
C
C
C
C
C
O
C
C
C
C
C
O
O
C
C
C
C
C
O
O
C
C
C
C
C
C
C
C
C
C
pd
pd
pd
pd
pd
pd
pd
pd
pd
pd
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
C
C
C
C
C
Note
Table 2. Solenoid States
B1-
G1-
B2-
G2-
4T
4R
5T
5R
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
O
O
C
C
C
C
O
O
pd
pd
pd
pd
pd
pd
pd
pd
O
O
O
O
O
O
O
O
O
O
O
O
C
C
C
C
Control Module
B3-
G3-
B4-
CS
VT
VR
IS
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
O
modulate
C
C
O
C
O
O
C
C
O
O
C
C
O
O
C
C
C
C
C
n/a
Isolation
Manifold-
External
Option
CE
IT
C
C
C
O
C
O
C
O
C
O
C
O
C
O
C
O
modulate
O
C
C
C
O
C
C
n/a
C
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