Page 250 - Foton Workshop Manual - Tunland (AT)

04-104 DIAGNOSTICS - ENGINE CONTROL SYSTEM

(b) Harness: Shake the harness gently in vertical
and horizontal directions, and check
thoroughly connections of the vibrated
connectors and the harness inside the engine/
driver's cabin instruments for disconnected
harness.
04

(c) Relay: parts and sensors: Pat the sensors,
relays, or parts which are considered as the
source of failure, and check them for
malfunction. However, do not beat the relays
violently for fear of open circuit of the relays.

2 . Heating method.

If a questionable zone is considered as the source of failure, use a hairdryer or similar
device to heat the most probable components that may cause the failure, and check
whether or not the failure occurs.

WARNING
The heating up temperature shall not exceed 60℃ (the heating temperature of
components shall allow free touch). Do not heat up the electronic control modules.

3 . Water spray method.
If the failure is considered to occur in rainy days or moist weather, spray water onto
the vehicle and check for any failure.

WARNING

• Do not spray water onto the engine directly. Water shall be sprayed onto the
front side of the radiator so as to change the temperature and humidity indirectly.
• Do not spray water directly onto the electronic elements.
• Do be careful to conduct water spraying on vehicle in which water leak exists,
since the water leak may possibly damage the ECM.

4 . Overall electric apparatus power-on method.
If the failure was possibly caused by too high electric load, power on all electric loads
including the central heating blower, headlights and rear window defroster, and check
whether or not the failure occur.

During the simulation test of failure phenomena, not only the phenomena shall be
identified, but also the faulty location or faulty parts shall be found out. For this reason,
the range of circuits (in which the failure might occur) shall be reduced as per the

Page 250