Page 544 - Foton Workshop Manual - Tunland (AT)

04-398 DIAGNOSTICS - ENGINE CONTROL SYSTEM

PTO OR CRUISE CONTROL DOES NOT WORK

Fault phenomenon Diagnosis logic Possible reasons
• Brake switch • Brake switch fault
PTO or cruise control does • Cruise control /PTO • Cruise control /PTO

04 not work selector switch selector switch fault
• ECM • ECM fault

Diagnosis Procedure

1 . Check the engine data
(a) Ignition switch: OFF.
(b) Connect the diagnosis tool with the fault diagnosis connector (16 pins) on the lower
left of the dashboard.
(c) Ignition switch: ON, and start the diagnostic tool.
(d) Read the motor data shown on the diagnostic tool.
Check whether the data flow is normal or not.

YES>To step 2.
No >Maintenance related faults.

2 . Check brake switch and the wire harness
(a) Check whether brake switch and the wire harness are damaged.
Is the inspection result normal?

YES>To step 3.
No >Maintenance related faults.

3 . Check cruise control /PTO selector switch and wire harness
(a) Check whether cruise control /PTO selector switch and wire harness is damaged.
Is the inspection result normal?

YES>To step 4.
No >Clean and change the default parts.

4 . Replace ECM

(a) Replace ECM. (Refer to "Chapter 11 Engine control system, Engine control module")
(b) Check the data flow of the engine, and make sure the engine phenomenon does not
exist, the system is normal.

Page 544