6270A
Service Manual
12
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.
Note
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.
Table 2. Solenoid States
6270A Main Manifold Control Module
Isolation
Manifold-
External
Option
Phase
B1-
1T
G1-
1R
B2-
2T
G2-
2R
B3-
3T
G3-
3R
B1-
4T
G1-
4R
B2-
5T
G2-
5R
B3-
VT
G3-
VR
B4-
IS
CS CE IT
Power Off C C C C C C C C C C C C C C C C
Power On C C C C C C C C C C C C C C C O
Measure Slot 1* O O C C C C C C C C C C C C C O
Measure Slot 2* C C O O C C C C C C C C C C C O
Measure Slot 3* C C C C O O C C C C C C C C C O
Measure Slot 4* C C C C C C O O C C C C C C C O
Measure Slot 5* C C C C C C C C O O C C C C C O
Control Apply pd pd pd pd pd pd pd pd pd pd C C O modulate C O
Control Exhaust pd pd pd pd pd pd pd pd pd pd C C O C modulate O
Zero O O O O O O O O O O O O C C C C
Vent - final state O O O O O O O O O O O O C C C O
Door open final
state
O O O O O O O O O O O O C C C C
Slot PCM - Empty C C C C C C C C C C C C C n/a n/a C
*O = OPEN, C = CLOSED, pd = product configuration dependent
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