Page 339 - Foton Workshop Manual - Tunland (AT)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-193

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.
• injector connector is in poor contact and the wiring harness is broken or shorted
• Four cylinder injector inspection methods are the same, take 1 cylinder as an
example for inspection

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 injector?
Is the inspection result normal?

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

2 . Check the wire harness for the 1 cylinder injector

(a) Ignition switch: OFF.
(b) Disconnect the battery negative cable.
(c) Disconnect the 1 cylinder injector connector E12.
(d) Disconnect connector E01 of ECM.

(e) Use a multimeter to measure the resistance
between the pin 1, 2 of 1 cylinder injector
connector E12 and the pin 49, 50 of ECM
connector E01 respectively.
Standard resistance

Multimeter connection
Standard value
pin
E12（1）- E01（49） ＜2 Ω

E12（2）- E01（50） ＜2 Ω

Page 339