Suzuki Liana RH413, Service Manual

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Air Conditioning System: Automatic Type 7B-70
A/C System Performance Inspection
S3RH0A7224024
Refer to “A/C System Performance Inspection”.
A/C System Inspection at ECM
S3RH0A7224025
Voltage Check
ECM and its circuits can be checked at ECM wiring couplers by measuring voltage.
CAUTION
!
ECM cannot be checked by itself. It is strictly prohibited to connect voltmeter or ohmmeter to ECM
with couplers disconnected from ECM.
1) Remove ECM from vehicle by referring to “Engine Control Module (ECM) Removal and Installation in Section 1C”.
2) Connect ECM couplers (1) to ECM (2).
3) Check voltage at each terminal of couplers connected.
NOTE
As each terminal voltage is affected by the battery voltage, confirm that the battery voltage is 11 V or
more when ignition switch is ON position.
Terminal arrangement of ECM coupler (Viewed from harness side)
ECM Voltage Values Table for Relation of A/C Control
I3RH0A722021-01
[A]: Fig. A 3. G41-2
[B]: Fig. B
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20 21
22 23 24 25 26 28 27 29 30 31
5 6 1 2 3 4 5 6 7
11 12
9 10 11 13 12 14 15 16
16 17
1 2
7 8
13 14
3 4
9 10
15
17 18
8
19 20 21 22 23 24
G41 (31P) G04 (24P) G03 (17P)
I3RH0A722022-01
Terminal Wire Color Circuit
Measurement
Ground
Normal Value Condition
G41-1 BLK/ORN
ECM ground for
power circuit Ground to body
(Fig A)
–0.5 – 0.5 V Engine running
G41-2 BLK
ECM ground for
power circuit Ground to body
(Fig A)
–0.5 – 0.5 V Engine running
G41-10 ORN
Sensor ground
for ECT sensor Ground to body
(Fig A)
–0.5 – 0.5 V Engine running