Page 38 - Foton Workshop Manual - Sauvana

01-32 INTRODUCTION - HOW TO TROUBLESHOOT THE VEHICLE

(c). Checkup of voltage.
• In the Power ON condition of the circuit,
identify whether the loop is an open
circuit through checking the voltage.
• Take this circuit as an example, all the
connectors are still connected. Measure
the voltage between the grounding and
the No.1 pin of connector A, the No.1
pin of connector B and the No.1 pin of
connector C respectively in order, which
are located at the position where control
module 5V outputs pins.
If the measuring result is as follows:
the voltage between the No.1 pin of connector A and the grounding: 5 V
the voltage between the No.1 pin of connector B and the grounding: 5 V
the voltage between the No.1 pin of connector C and the grounding: 0 V
it can be concluded that the open circuit is between connector B and the No.1 pin of
connector C.

3. A short circuit inspection
(a). The short circuit of harness grounding is
shown as the fig. on the left.Check the
continuity between it and grounding to
make sure the position of short circuit in
Step (2).

(b). Checkup of continuity.
• Disconnect connector A and C, and
measure the resistance between the
grounding and the No.1 pin and the No.2
pin of connector A respectively.
Resistance：≥ 1 MΩ
NOTICE:
Shake the harness slightly in vertical and
horizontal directions and measure the resistance.
Take this circuit as an example:
the resistance between the No.1 pin of connector A and the grounding: ＜ 2 Ω
and the resistance between the No.2 pin of connector A and the grounding: ≥ 1 MΩ
it can be concluded that the short circuit is between connector A and the No.1 pin of
connector C.

Page 38