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Lotus Eleven/Elise/Exige. Manual - part 71

Lotus Service Notes

Section JJ

Page 37

JJ.17 - LOTUS SCANNER TOOL CHECKING PROCEDURES

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 the diagnostic codes is available only by using the 'Lotus Scan' tool connected to the DLC (see

JG.15). The ‘Lotus Scan’ is a hand held electronic scanner tool with an LCD display panel which is able to
display any stored trouble codes and sensor readings as well as allowing manual operation of actuators.
The facilities available include:

View fault codes/wheel speeds/valve activities

Clear fault codes

Generate valve/motor activities

Read EEPROM contents

Read ECU identification

Important Notes
-

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

tive.

Never connect or disconnect the DLC to/from the control unit with the ignition switched on.

Before charging or quickcharging, disconnect the battery from the vehicle electrical system.

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 JJ

Page 38

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

ECU Identification

The ECU identification number for the Elise/Exige is: A120J6000F

Supplier ECU Hardware Number: EBC 430

Supplier ECU Software Number: LCFWDQ04K2K

Lotus Service Notes

Section JJ

Page 39

Circuit Diagram

Diagnostic Trouble Codes

Lotus Service Notes Section JJ

Page 40

Diagnostic Trouble Codes

DTC

Diagnostic Trouble Code Storage Condition

Remedy

C0035

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

C-04

...

No signal;

C-04

...

Incorrect signal;

C-04

C0040

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

C-05

...

No signal;

C-05

...

Incorrect signal;

C-05

C0045

Rear left wheel speed sensor:

Short circuit or circuit open;

C-06

...

No signal;

C-06

...

Incorrect signal;

C-06

C0050

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

C-07

...

No signal;

C-07

...

Incorrect signal;

C-07

C0060

Front left outlet solenoid valve circuit malfunction;

C-12

C0065

Front left inlet solenoid valve circuit malfunction;

C-12

C0070

Front right outlet solenoid valve circuit malfunction;

C-12

C0075

Front right inlet solenoid valve circuit malfunction;

C-12

C0080

Rear left outlet solenoid valve circuit malfunction;

C-12

C0085

Rear left inlet solenoid valve circuit malfunction;

C-12

C0090

Rear right outlet solenoid valve circuit malfunction;

C-12

C0095

Rear right inlet solenoid valve circuit malfunction;

C-12

C0110

Return pump:

circuit open or shorted;

C-10

...

locked or shorted;

C-10

C0121

Valve relay circuit malfunction;

C-09

C0161

Brake light switch fault;

C-11

C0232

Brake system telltale voltage:

high or open circuit;

C-13

...

low;

C-13

C0245

Wheel speed:

sensor erratic signal;

C-08

C0245

error;

C-08

C0252