3, Diagnosis Meter Connection; 4, Read Malfunction Information By Wink Code; Working Principle And Character Of Efi System Element; Electronic Control Unit - Ecu - Chery A21 2005 Service Manual

CHERY·A21 SERVICE MANUAL
★ Output winking code that is P-CODE value after the K cable contact with the ground
more than 2.5 seconds. For example: the winking mode of P0203 is: wink 10 times
continuously – intermission – wink 2 times continuously – intermission - wink 10 times
continuously – intermission – wink 3 times continuously.

2.3.3, DIAGNOSIS METER CONNECTION

This system adopts "K" cable communication protocol and use ISO 9141-2 standard
diagnosis joint, please see chart 2.5. This standard diagnosis joint is connected to engine
harness fixed. The pins of No.4, 7 and 16 on the standard diagnosis joint are used for EMS.
The pin of No. 4 on standard diagnosis joint is ground wire; Pin of No.7 is connecting to
No.71 pin of ECU, which is engine data "K" cable; No.16 pin is connecting to accumulator
anode.

2.3.4, READ MALFUNCTION INFORMATION BY WINK CODE

Switch on ignition switch and use engine data K cable(that is standard diagnosis joint 7#)to
ground(use one lead connect pin of diagnosis joint 4# and pin of 7#) more than 2.5 seconds,
if there are malfunction code in ECU malfunction memorizer, the malfunction light wink
code of engine now is P-CODE value. Such as: P0203 winking type is: wink 10 times
continuously – intermission – wink 2 times continuously – intermission - wink 10 times
continuously – intermission – wink 3 times continuously.

3. WORKING PRINCIPLE AND CHARACTER OF EFI SYSTEM ELEMENT

3.1 ELECTRONIC CONTROL UNIT - ECU

1)Exterior drawing
2)Purpose: ECU accepts and deals with engine status signals inputted from sensors and
drives the actuators to work. Making engine working as the established program, insure
power good, fuel consuming effectively and low emission.
3)Mounting position: Passenger compartment
4)Functions
l Multipoint injection in order
l Control ignition
PDF created with pdfFactory Pro trial version
Chart 2.5 ISO9141-2 Standard Diagnosis Joint
www.pdffactory.com
ENGINE EFI SYSTEM
10