Suzuki Liana RH418, Supplementary Service Manual

Page: 53 / 371

Engine General Information and Diagnosis: 1A-40
MIL Does Not Flash or Just Remains ON Even with Grounding Diagnosis Switch Terminal
S3RH0B1104014
Wiring Diagram
Circuit Description
When the ignition switch is turned ON, ECM causes the main relay to turn ON (close the contact point). Then, ECM
being supplied with the main power, turns ON the malfunction indicator lamp (MIL). When the engine starts to run and
no malfunction is detected in the system, MIL goes OFF but if a malfunction was or is detected, MIL remains ON even
when the engine is running.
Troubleshooting
1
G04-10
G04-23
12V 5V
ECM
2
3
G04-6
+B
G04-5
B
D
A
C
BLK/WHT
BRN/WHT
BLK/RED
BLK/RED
C41 (31P) G04 (24P) G03 (17P)
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
BLK
DN
TS GND MON
PPL/WHT C41-27
G04-15
PNK/GRN
G03-17
7
4
G03-7
PPL/YEL
5
6
9
IG1
PNK/BLK
BLK/RED
BLK/YEL
8
7
GRN
GRN
I3RH0A110012-01
1. “BATT” fuse 4. To battery 7. To ignition switch
2. Main fuse box 5. Diagnosis connector 8. Main relay
3. “IG” fuse 6. MIL 9. “METER” fuse
Step Action Yes No
1 MIL circuit check
1) Turn ignition switch OFF and disconnect connectors
from ECM.
Does MIL turn ON at ignition switch ON?
“PPL/YEL” circuit
shorted to ground. Go to Step 2.
2 ECM connection check
1) Turn ignition switch OFF.
Is connector (“C41-27” connection) connected to ECM
properly?
Go to Step 3. Poor connector
connection.
3 Diag. switch terminal circuit check
1) Connect connectors to ECM.
2) Using service wire, ground “C41-27” terminal with
connectors connected to ECM.
3) Turn ignition switch ON.
Does MIL flash?
“PPL/WHT” or “BLK”
circuit open. Substitute a known-
good ECM and recheck.