Page 435 - Foton Workshop Manual - Tunland (AT)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-289

NOTICE

• To implement the following steps, ensure that ECM is grounded properly.
• Before conducting electric diagnosis, do refer to the reference circuit diagram
and the element information.
• Before conducting measurement, check the pins of connectors for rupture,
04
looseness and rust, and ensure that the pins are contacted properly.
• If the connection is good, check the sensor signal voltage when moving the
connector and harness. If a fault occurs, the voltage display on the diagnostic
instrument will change.

1 . DTC inspection
(a) Ignition switch: OFF.
(b) Connect the diagnostic apparatus.
(c) Use the diagnostic apparatus, read the fault code.
(d) Confirm whether there is fault code related to exhaust pressure sensor?
Is the inspection result normal?

YES>To step 2.
NO>Intermittent trouble exists.

2 . Check exhaust pressure sensor circuit
(a) Ignition switch: OFF.
(b) Disconnect the battery negative cable.
(c) Disconnect the exhaust pressure sensor connector E16.
(d) Connect the battery negative cable.
(e) Ignition switch: ON.

(f) Use a multimeter to measure the voltage
between the pin 1 of the exhaust pressure
sensor connector E16 and ground.
Standard voltage

Multimeter connection
Standard value
pin

E16（1）-ground 4.75～5.25 V

Is the inspection result normal?
YES>To step 3.

No > Maintain or replace the harness.

Page 435