Rolls-Royce Corniche - Electrical Fault Finding Analysis for Power Operated Hood

Rolls-Royce Silver Shadow 8 Bentley T Series
Workshop Manual
Chapter M
Electrical Fault Finding Analysis for Power Operated Hood
Symptom
1. The system will not
function when the switch
is operated
Possible Cause
1. (i) Battery condition, and
below
9 Volts
replace if necessary
(ii) The electrically operated
switch for the pump motor
is faulty
I
(iv) Faulty fuse
I
(iv) Check the fuse on the Distribution
board (No.
6)
(ii) Test the switch as described in
Section
M4 - Starter Motor
(iii) Faulty operating switch
(iii) Substitute with one known to be
b. Replace if necessary the
motor/pump unit
in good condition
I
(v) Faulty motor/pump unit
(v)
a. Inspect the brushgear, and
replace if necessary
(vii) Incorrectly tightenend or
I (vii) Check all terminals for tightness
dirty electrical connections
(vi) Break in circuitry
2. Power unit working
1 2. (i)
Both solenoid valves faulty
2. (i) Renew solenoid valves
correctly, but the hood will
not open or close
I
(ii) Incorrectly tightened or (ii) Check electrical connections
dirty electrical connections
(vi) Check all circuitry for continuity
3. The hood will not open
although the pump is
working
(iii) Lack of hydraulic fluid
4. The hood will not close
although the pump is
working
(iii) Check level of hydraulic fluid
in reservoir
(ii) Incorrectly tightened or
1 (ii) Check the electrical connections
dirty electrical connections
3. (i) The UP solenoid is faulty 3. (i) Renew the solenoid valve
(iii) Lack of hydraulic fluid
(ii) Incorrectly tightened or
1 (ii) Check the electrical connections
dirty electrical connections
(iii) Check the level of hydraulic fluid
in reservoir
4. (i) The DOWN solenoid is
faulty
(iii) Lack of hydraulic fluid
I
(iii) Check level of hydraulic fluid
in reservoir
4. (i) Renew the solenoid