Page 871 - Workshop Manual - Tunland (2017)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-185

04
CAUTION

• 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,
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 postprocessing diesel oxidation converter
missing circuit?
Is the inspection result normal?

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

2 . Check the mechanical systems of postprocessing diesel oxidation catalyst.

(a) Check whether the converter is installed correctly.
(b) Check whether the converter is damaged or not.

Is the inspection result normal?

YES>Check the fault location.
NO >To step 3.

3 . Check DPF temperature sensor circuit

(a) Ignition switch: OFF.
(b) Disconnect the battery negative cable.
(c) isconnect DPF temperature sensor connector Q01.
(d) Connect the battery negative cable.
(e) Ignition switch: ON.