Suzuki Jimny Service Manual page 403

6-46 ENGINE GENERAL INFORMATION AND DIAGNOSIS
Table A-5 ECM Power and Ground Circuit Check - MIL Doesn't Light at Ignition
Switch ON and Engine Doesn't Start Though It Is Cranked Up
CIRCUIT DESCRIPTION
1. Main fuse
2. Ignition switch
3. Fuse box
NOTE:
For TYPE A and TYPE B, refer to the NOTE in "ECM Terminal Voltage Values Table" for applicable
model.
When the ignition switch tuned ON, the main relay turns ON (the contact point closes) and the main power is
supplied to ECM.
INSPECTION
Step
1 Main Relay Operating Sound Check
Is operating sound of main relay heard at ignition switch ON?
2 Main Relay Check
1) Turn OFF ignition switch and remove main relay (1).
2) Check for proper connection to main relay (1) at terminal 3 and 4.
3) Check resistance between each two terminals. See Fig. 1 and 2.
Main relay resistance
Between terminals A and B : Infinity
Between terminals C and D : 70 – 110 Ω Ω Ω Ω (at 20 °C, 68 °F)
4) Check that there is continuity between terminals 1 and 2 when bat-
tery is connected to terminals 3 and 4. See Fig. 3.
Is main relay in good condition?
4. Main relay
5. Malfunction indicator lamp in
combination meter
6. "FI" fuse
Action
7. "IG" fuse
8. "IG COIL METER" fuse
Go to Step 5. Go to Step 2.
Go to Step 3. Replace main
[A] : Case of TYPE A is shown (See
NOTE)
[B] : Case of TYPE B is shown (See
NOTE)
Yes No
relay.