X.XX ERROR INDICATOR LIGHT

The ECUís red LED indicator flashes error codes to indicate fault conditions.

Error conditions include:-
Faulty sensors. Out of range signals.

Electrical interference. Operation endangering engine life.

Internal ECU malfunction

This indicator is located near the main connector, and some models (eg:- SMC) allow connection of a remote indicator light. Each time the ECU is activated (ignition on) previously detected HISTORY or old error conditions are indicated. After the completion of the HISTORY error codes, error codes are displayed as the errors are detected. An error code will remain stored in ECU memory until the fault is repaired and the engine is warned-up (from cold to normal operating temperature) 20 times. This error memory feature allows the engines' user reasonable time to fault find difficult intermittent faults, or drive in limp-home mode to qualified service for repair. When the repair is effected the old stored error codes may be erased by using the laptop calibration program.

Error code format:-

1. Error codes are all 2 digits, each digit comprising a number of 1/2 second on, 1/2
second off flashes.

2. The 2 digits of each code are separated be 2.5 seconds.

3. Error codes are separated by 5 second pause.

4. As detected error codes can occur 10 seconds after the completion of the ignition
on HISTORY CODES.

Normal Engine and ECU operation should present only 2 flashes 2.5 seconds apart at ignition on. Indicating that the ECU is without any stored error HISTORY and presently not detecting any new errors.


Example of error indication:- Air Intake temperature error

User Action
System Error
ECU Error History memory
ECU Indication
. .
           
No Power
Nil
Nil
   
Ign On
Nil
Nil
1 flash, pause 2.5 sec, 1 flash
= code 11, no error HISTORY.
.
no flashes for 10 sec
= pause after history code.
.
no further flash
= no existing/new errors.
Disconnect air temp sensor
21
Nill
2 flashes, pause 2.5 sec, 1 flash
= code 21 Air intake temperature sensor fault.
Ign Off
21
21
   
Ign On
21
21
2 flashes, pause 2.5 sec, 1 flash
=

HISTORY code 21 Air intake temperature sensor previously faulty.

.
no flashes for 10 sec
= pause after history code.
.
21
21
2 flashes, pause 2.5 sec, 1 flash
=

Air intake temperature sensor still faulty.

Reconnect Air Temp Sensor
Nil
21
   
Ign Off
Nil
21
   
Ign On
Nil
21
2 flashes, pause 2.5 sec, 1 flash
=

HISTORY code 21 Air intake temp sensor previously
faulty.

.    
no flashes for 10 sec
= pause after history code.
.
no more flashes
=

no existing/new errors.


Copyright © 2002 Ray Hall Turbos. Autronic