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Lotus Evora. Manual - part 51

Lotus Service Notes

Section JL

JL.13 - WHEEL SPEED SENSORS

A 48 pole vehicle speed sensor ring is integrated into the hub inboard grease seal, the signal from which is

read by a sensor inserted into the rear of the hub carrier and retained by a single button head socket screw.

Wheel speed data is supplied to the ABS control module, which uses the information to modulate brake

system pressures, and also outputs a road speed signal to the engine ECM, and to the instrument pack for

speedometer operation. Output from each wheelspeed sensor can be checked using the Lotus TechCentre.

JL.14 - DATA LINK CONNECTOR (DLC)

The Data Link Connector (DLC) is a 16 terminal electrical connector plug, complying with SAE J 1962,

which provides a means of communication with the ABS and engine management electronic control units. The

connector is used in service to connect electronic diagnostic equipment such as the ‘Lotus TechCentre’ tool

which allows system interrogation including the reading of trouble codes.

The DLC is located on the back of the scuttle crossbeam above the outboard side of the driver's

footwell.

JL.15 - SPECIAL TOOLS

Lotus TechCentre

Can Bus Diagnostics

Controller Area Network (CAN) is an electronic standard to allow high speed communication between modules

and controllers, via a serial data bus. The bus is a circuit linking the modules to the controller, consisting of a

pair of cables, twisted together to reduce electromagnetic interference, and carrying a square wave voltage

signal corresponding to '0's and '1's, coded in such a way as to identify and prioritise the individual messages.

On the Evora, CAN based systems include; engine management, anti-lock braking, safety restraint, instrument

pack and tyre pressure monitoring (where fitted).

A 'stand alone' lap top PC loaded with 'Lotus TechCentre' software allows the CAN based serial data to be

read. Updates and support are accessed via an internet connection.

A Vehicle Communication Device (VCD), part number T000T1476F, is used to connect the vehicle to the lap-

top Lotus TechCentre. Engine programming, live data display, diagnostics of engine, ABS and airbag systems,

and service tell tale lamp resetting (where applicable) are all carried out via the Lotus TechCentre.

The minimum specification of the laptop computer for installation of the Lotus Techcentre is as follows:

Processer 1.70 Ghz;

1 GB RAM;

40 GB HDD;

CDRW DVD ROM;

WIN XP PRO;

USB interface;

Ethernet or Wireless LAN

Note that it is recommended that this laptop be dedicated soley to the Lotus TechCentre, with no other soft-

ware installed. A licensing/support fee will also apply, to be charged monthly or annually.

Lotus Service Notes

Section JL

JL.16 - ‘LOTUS TECHCENTRE’ CHECKING PROCEDURES

1. Trouble Codes

When the ABS controller detects a fault in the system, the following events occur;

The ABS tell tale is lit;

ii) The anti-lock system is switched out;

iii) A trouble code is stored in the non volatile random access memory i.e. memory which is retained when

the power supply is interrupted, or the battery disconnected.

Trouble codes may be either Condition Latched, or Ignition Latched:

Condition Latched; With this type of fault, which is generally low or high voltage, the ABS tell tale will light, and

the anti-lock system switch out, until such time as conditions return to normal, at which point the light will be

extinguished, and the anti-lock be reinstated. The trouble code will be stored only whilst the fault is present.

Ignition Latched; This type of fault, of which are most categories, will cause the tell tale to be lit and the anti-

lock to be inhibited until such time as the fault is no longer detected at the moment of a subsequent switching

on of the ignition. At this point, the lamp will be extinguished, and the ABS restored, but the trouble code will

be retained in the memory for the next 20 drive cycles i.e. ignition switched on and a minimum road speed of

5 mph attained.

Access to diagnostic codes is available by using the Lotus TechCentre laptop PC connected to the Diag-

nostic Link Connector (DLC - see JL.14). This tool allows the display of any stored trouble codes and sensor

readings as well as allowing manual operation of actuators.

The facilities available include:

Viewing fault codes/wheel speeds/valve activities.

Clearing fault codes.

Generating valve/motor activities.

Reading EEPROM contents.

Reading ECM identification.

Updating ECM calibration.

Important Notes

Whenever the Lotus TechCentre tool is connected, the ABS tell tale is lit and the anti-lock function is in-

operative.

Never connect or disconnect the DLC to/from diagnostic equipment with the ignition switched on.

Unless using a trickle 'battery conditioner' type charger, disconnect the vehicle battery before charging or

boost charging.

Never disconnect the battery from the vehicle electrical system with the engine running.

Never use a quick-charger for starting.

Take care when touching energised parts of the ignition system.

ECMs must be removed prior to welding operations, or subjecting to oven temperatures above 80°C.

When voltage testing, use only a high-resistance type meter.

During test steps which involve the connection of contacts from harness plugs or control units with ground

or battery voltage (+12V), exercise great care as incorrect contact can cause permanent damage to the

ECM internal circuits.

When measuring resistance from ground bearing wires to vehicle ground, the nominal value of ‘less than

2 ohms’ sometimes cannot be achieved. In this case, disconnect the negative (ground) post of the battery

and measure the resistance to the vehicle earth lead.

Always erase trouble codes from any control unit after a test is done.

Lotus Service Notes

Section JL

2. Abbreviations & Definitions

BATTERY VOLTAGE System voltage

BRAKE LIGHT SW. Brake light switch

FL WHEEL SPEED Front left wheel speed

FR WHEEL SPEED Front right wheel speed

RL WHEEL SPEED Rear right wheel speed

RR WHEEL SPEED Rear right wheel speed

FRONT WHL SPEEDS Front wheel speed

REAR WHL SPEEDS Rear wheel speed

VALVE RELAY CMD Valve relay command

VAVLE RELAY FDBK Valve relay feedback

RETURN PUMP CMD Return pump command

RETURN PUMP FDBK Return pump feedback

FL HOLD SOL. CMD Front left solenoid hold command

FL HOLD SOL. FDBK Front left solenoid hold feedback

FL REL. SOL. CMD Front left solenoid release command

FL REL. SOL. FDBK Front left solenoid release feedback

FR HOLD SOL. CMD Front right solenoid hold command

FR HOLD SOL. FDBK Front right solenoid hold feedback

FR REL. SOL. CMD Front right solenoid release command

FR REL. SOL. FDBK Front right solenoid release feedback

RL HOLD SOL. CMD Rear left solenoid hold command

RL HOLD SOL. FDBK Rear left solenoid hold feedback

RL REL. SOL. CMD Rear left solenoid release command

RL REL. SOL. FDBK Rear left solenoid release feedback

RR HOLD SOL. CMD Rear right solenoid hold command

RR HOLD SOL. FDBK Rear right solenoid hold feedback

RR REL. SOL. CMD Rear right solenoid release command

RR REL. SOL. FDBK Rear right solenoid release feedback

3. ECU Identification

Lotus Electro-Hydraulic Unit part number: C132J0007J

Bosch Electro-Hydraulic Unit part number: 0 265 236 143

Bosch ECU Software reference: 6209306030000

Lotus Service Notes

Section JL

5. Diagnostic Trouble Codes

DTC Diagnostic Trouble Code Storage Condition

C0035 Front left wheel speed sensor: Short circuit or circuit open;

No signal;

Incorrect signal;

C0040 Front right wheel speed sensor: Short circuit or circuit open;

No signal;

Incorrect signal;

C0045 Rear left wheel speed sensor: Short circuit or circuit open;

No signal;

Incorrect signal;

C0050 Rear right wheel speed sensor: Short circuit or circuit open;

No signal;

Incorrect signal;

C0060 Front left outlet solenoid valve circuit malfunction;

C0065 Front left inlet solenoid valve circuit malfunction;

C0070 Front right outlet solenoid valve circuit malfunction;

C0075 Front right inlet solenoid valve circuit malfunction;

C0080 Rear left outlet solenoid valve circuit malfunction;

C0085 Rear left inlet solenoid valve circuit malfunction;

C0090 Rear right outlet solenoid valve circuit malfunction;

C0095 Rear right inlet solenoid valve circuit malfunction;

C0110 Return pump: circuit open or shorted;

locked or shorted;

C0121 Valve relay circuit malfunction;

C0161 Brake light switch fault;

C0232 Brake system telltale voltage: high or open circuit;

low;

C0245 Wheel speed: sensor erratic signal;

C0245 error;

C0252 Replace electronic control unit;

C0550 Replace electronic control unit;

C0550 Brake system or electronic control unit malfunction;

C0556 Replace electronic control unit;

C0561 Replace electronic control unit;

C0563 Replace electronic control unit;

C0564 Replace electronic control unit;

C0800 Switched battery voltage: high (valve relay)

low (valve relay)

For remedial procedures, see Lotus TechCentre display.

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