Page 36 - Workshop Manual - Tunland (2017)

01-30 INTRODUCTION - HOW TO TROUBLESHOOT

01 (c) Voltage Test
• When the circuit is energized, check
for broken circuit by means of voltage
test.
• Take the circuit as an example. All the
connectors are connected. Measure
the voltage between Pin 1 of Connector
A, Pin 1 of Connector B, Pin 1 of
Connector C at the 5V output of the
control module and the grounding in
sequence.
If the following results are achieved:
Voltage between Pin 1 of Connector A
and grounding: 5V

Voltage between Pin 1 of Connector B
and grounding: 5V
Voltage between Pin 1 of Connector C
and grounding: 0 V
It means the circuit is broken between
Pin 1 of Connectors B and C.

3 . Check for Short Circuit

(a) As illustrated at the left, there is short circuit
between the harness and the grounding.
Perform conduction test between it and the
grounding in Step 2, to identify the short
position.

(b) Conduction Test
• Disconnect Connectors A and B and
measure the resistance between Pins
1 & 2 of Connector A and the
grounding.
Resistance: ≥ 1 MΩ

CAUTION

Slightly swing the harness horizontally and
vertically, and measure the resistance.

Take this circuit for an example.
If the resistance between Pin 1 of
Connector A and grounding: ＜ 2 Ω