Haynes manual page 12.30 C20XE Motronic M2.5 The relay referred to is K68 a twin coil relay 6 pins at track 296
location? either relay box in engine compartment? or next to ECU drivers kick panel?
This is a quote from a pdf named "Bosch Motronic 2.5 Copyright Equiptech"
The Motronic electrical system is controlled by a single system relay with dual contacts. A permanent voltage supply is made to
relay terminals 30 and 86 from the battery positive terminal. When the ignition is switched on, the ECU earths terminal 85
through ECU terminal number 36 which energises the first relay winding. This causes the first relay contacts to close and
terminal 30 is connected to the output circuit at terminal 87. A voltage supply is thus output at terminal 87. Terminal 87 supplies
voltage to the injectors, ECU terminal 37, ISCV and the FTVV when fitted. In addition voltage is supplied to the second relay
contact.
When the ignition is switched on. the ECU briefly earths relay contact 85b at ECU terminal 3. This energises the second relay
winding, which closes the second relay contact and connects voltage from terminal 30 to terminal 87b, thereby providing voltage
to the fuel pump circuit. After approximately one second, the ECU opens the circuit and the pump stops. This brief running of the
fuel pump allows pressure to build within the fuel pressure lines, and provides for an easier start.
The second circuit will then remain open until the engine is cranked or run. Once the ECU receives a speed signal from the CAS,
the second winding will again be energised by the ECU, and the fuel pump will run until the engine is stopped.
Immobiliser Relay Haynes Manual page 12.28 Relay K3 track 109
Location= Item 11 page 12.19