9000 L4-1985cc 2.0L DOHC Turbo EFI (1987)
On the intake manifold at the throttle
262
Temperature switch, shift-up indication
Between the two intake manifold ports
263
Vacuum switch, shift-up indication
Below the facia, to the left of the steering column (behind the knee shield)
264
Switch, fifth gear
On the gearbox, next to the reversing light switch
270
Shift-up indication relay
In the electrical distribution box behind the glove compartment
Operation
Shift-up indication is fitted to cars with manual transmissions delivered to the USA market.
The shift-up indication system enables the driver to use the engine characteristics in the best possible manner, thus minimising the fuel consumption.
Indication is provided by a lamp which lights up when the driver should shift up, i.e. when the engine speed and throttle setting have attained certain
values.
1987 model
The shift-up indication system receives its supply from fuse 7 when the ignition switch has been set to the drive position.
Shift-up indication relay 270 receives ignition pulses from ignition pulse amplifier 147, which provide information on the engine speed. Vacuum
switch 263 provides information on the vacuum in the intake manifold. When the engine speed has exceeded 1800 + 100 r/min and the vacuum is
about 0.3 bar, lamp 47K will light up.
To avoid incorrect indications, the system is equipped with the following switches:
Switch 264, which switches out the system when fifth gear is engaged.
Temperature switch 262, which switches out the system if the engine temperature is below about +35°.
Throttle contact 261, which switches out the system when the throttle is in the rest position.
In order to avoid irritating flashing of the lamp on sudden changes in the engine loading, the relay includes a time delay function which delays
lighting-up of the lamp by 1.7 5 and switching-off by 1.5 5.
1988 model, T16 Lambda
The operation is the same as on the 1987 model, except that the ignition pulses supplied to relay 270 are provided by ignition system amplifier 146.
1988 model, 116 Lambda
On non-Turbo cars with fuel injection. the shift-up indication is of entirely new design, so relays 270 for cars with and without turbocharger cannot be
interchanged.
The logic circuit for the lighting of lamp 47K has been incorporated into control unit 200 for the fuel injection system (variant 2.4). Relay 270 acts
solely as a signal converter, since the lamp cannot be connected directly to the control unit.
Relay 270 is supplied from fuse 7, and sensor 132 for the speed transmitter from fuse 13. For information on the power supply to the control unit, see
the section entitled "LH fuel system: 116 Lambda".
In order to determine when the lamp should light up, control unit 200 needs information on the engine speed and load, and on which gear is engaged.
It receives this information in the following form:
ignition pulses from EZK ignition system control unit 176
control signals to the injection valves (opening times)
The control unit can determine which gear is engaged by comparing the engine speed with information from sensor 132 for the speed transmitter.
When the engine load is below a certain value (basic injection time) and the engine speed is above a certain value, the control unit earths pin 26 of
relay 270, causing lamp 47K to light up. The engine speed at which the lamp will light up is dependent upon the gear engaged:
1st:2000 r/min
2nd:1900 r/min
