Shift Indicator - A/T
Shift-up Indication Diagrams:
Shift-up Indication Components:
Locations of components
3 Earthing point, facia
At the left-hand front speaker socket
8 Lighting relay
1987: in the electrical distribution box be- hind the glove compartment
1988: in the electrical distribution box in the engine compartment, behind the left-hand headlamp
21 Ignition switch relay
In the electrical distribution box behind the glove compartment
22A Fuse board
Behind the access panel in the glove compartment
47K Lamp for shift-up indication
In the combined instrument
57 Three-pole connector
In the engine compartment, at the windscreen wiper motor
67 Six-pole connector
In the engine compartment, at the windscreen wiper motor
113 Relay/time-delay relay for the rear window heater
In the electrical distribution box behind the glove compartment
123 Four-pole connector
In the engine compartment, at the windscreen wiper motor
132 Sensor for the speed transmitter
In the speedometer, in the combined instrument
146 Amplifier of the electronic ignition system
In the engine compartment, on the lefthand wheel housing, at the battery
147 Ignition pulse amplifier (1987)
In the electrical distribution box behind the glove compartment
155 Relay, AC/ACC
In the electrical distribution box behind the glove compartment
156 Time-delay relay, AC/ACC
In the electrical distribution box, behind the glove compartment
158 Negative distribution terminal
In the electrical distribution box behind the glove compartment
176 Control unit, EZK ignition system
Below the facia, to the left of the steering column (behind the knee shields) (1987) under the left-hand front seat (1988)
200 Control unit, LH
On the left-hand side of the bulkhead between the engine compartment and the passenger compartment
201 Engine earthing point
At the engine lifting lug
202 Engine temperature transmitter
On the intake manifold flange, between cylinders 2 and 3
203 Throttle angle transmitter
On the throttle housing
231 Distribution terminal +54
In the electrical distribution box behind the glove compartment
257 Earthing point
On the alternator bracket
261 Throttle contact, zero position, shift-up indication
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°C.
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
3rd:1800 r/min
4th:1775 r/min
If the engine speed exceeds 5000 r/min in 1st, 2nd, 3rd or 4th gear, the lamp will also light up, regardless of the engine load.
To avoid incorrect indications, the system will be switched out under the following conditions:
the radiator coolant temperature sensed by engine temperature transmitter 202 is below 47.6°C.
at engine idle - pin 1 of throttle angle transmitter 203 is earthed.
when fifth gear is engaged.
In addition, all input signals must have a duration of at least 0.75s.
Fault-tracing hints
1987 model
1. Set the ignition switch to the drive position and check fuse 7. Also check that the supply to the fuse is live.
2. Check lamp 47K.
3. Check that the switches in the system close and open the circuit under the specified conditions.
4. Check that relay 270 is receiving ignition pulses
5. Check the connectors and the earth connections
1988 model
The instructions for the 1987 model can be used when fault-tracing on cars with turbocharger.
When fault-tracing on cars without turbocharger, check that the supply to relay 270 is live and make sure the connectors and earth connections are in good condition. Check also the control unit and related transmitters. The shift-up indication will be operative only if the LH system is operating properly.