Page 2641 - Foton Workshop Manual - Sauvana

DIAGNOSIS-ENGINE CONTROL SYSTEM 62-589
THE DIAGNOSTIC TOOL CANNOT COMMUNICATE WITHTHE

ECU

Fault phenomenon Diagnosis logic Possible reasons

• ECUpower supply circuit is bad
The diagnostic tool • CAN bus circuit • Circuit breaks between ECU 62
cannot communicate • ECU power supply circuit and the diagnosis tool
withthe ECU • ECU
• ECU

Diagnosis Procedure
1. Check the motor data

(a). Ignition switch: LOCK。
(b). Connect the diagnosis tool with the fault diagnosis connector (16pins) on the lower
left of the dashboard.
(c). Ignition switch: Turn on the ignition switch, and start the diagnostic tool.
(d). Read the motor data shown on the diagnostic tool.

Check whether the data flow is normalor not.
YES>To step 2。
No >Maintenance related faults.

2. Check other module data

(a). Read theABS ( or other systems )data shown on the diagnostic tool.
(b). Read the data shown on the diagnostic tool.

Can the diagnostic tool readthe ABS ( or other systems )module data flow ?
YES>To step 4。
No >To step 3。

3. Checkthe communication CAN line of ECU

(a). Ignition switch: LOCK。
(b). Disconnect the battery negative cable.
(c). Disconnect theECUconnectorC 99.
(d). Use a multimeter to measure anddiagnose the continuity of interface connector C
10 pin 6, 14 and ECU connector C 99 pin 44 and 45.
(e). Use a multimeter to measure and diagnose the continuity of interface connectorC
10 pin14, 6and the grounding.
( f ). Turn the ignition switch to the position of “on”, Use a multimeter to measure and
diagnose the resistance betweenthe interface connectorC 10 pin14 and pin 6 .

Page 2641