Rolls-Royce Silver Shadow II - Page 100

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2 of 6
SY/~.J.04 (Issue 2)
The bellows actuator should be inspected for obvious faults such
as a disconnected vacuum pipe, throttle chain, or electrical
connections, and if no fault is found it may be tested for
operation. Both wires to the wiring loom should be disconnected
and one of them (from the actuator) connected to a good chassis
earth. Start the car engine and ensure that the gear range
selector lever is in the 'PAR:K' position and the cut-out removed.
Briefly touching the other actuator wire to a known+ 12V source,
should cause the throttle to open momentarily, (care should be
te~en not to overspeed-the engine by holding the wire to the'
+ 12V source} •
If this test reveals no faults, then the actuator wires may be
reconnected to the wiring loom after which the switch, car
wiring, and electronic control box must be tested.
PROCEDURE:
The following procedure should be used when the top roll is
removed:
l. Disconnect the electronic control unit from the wiring
loom.
2. Carry out the following checks on the wiring syste~s, testing
the appropriate pins of the ~ulti-lucar loom socket.
3 .
4.
5.
{i)
Connect a test lamp between the g.reen;blue wire
(pin 8), and a known chassis earth point.
{ii) Check that there is a link on the loom socket between
(i}
pins 9 and+, thus linking the Green and Blue cables tog~the1
Turn the ignition switch to the RCN position and
move the gear selector lever to 'LOW', then
I INTEP..MEDIATE t ' 1;hen 'DRIVE' •
(ii) In each position the test lamp should be illuminated
but it should be extinguished when 'PAru<:
1
,
',F.EVEF.SE
1
or 'NEUTRAL' are engaged.
(iii) Switch off the ignition.
{iv) P.epeat 4 {1) and (ii) but with a test lamp connected
between pin 2 and earth.
(v) !f tr.ese tests are successful proceed to 6.
(i)
If the lamp is not illwninated in 4 (11) switch off
the ignition and again check the condition of fuse
number 9.
*Re-issued to change to correct pins being checked.
(see PROCEDURE item 3 (ii) above).