Suzuki GRAND VITARA XL-7 Owner's Manual page 208

INSPECTION
Step
1 Main relay operating sound check :
Is operating sound of main relay heard at igni-
tion switch ON?
2 Fuse check :
Is main "FI" fuse in good condition?
3 Main relay check :
1) Turn OFF ignition switch and remove main
relay.
2) Check for proper connection to main relay
at terminal 3 and 4.
3) If OK, check main relay for resistance and
operation referring to "MAIN RELAY
INSPECTION" in Section 6E2.
Is check result satisfactory?
4 ECM (PCM) power circuit check :
1) Turn OFF ignition switch, disconnect con-
nectors from ECM (PCM) and install main
relay.
2) Check for proper connection to ECM (PCM)
at terminals C51-3-20, E61-9, C51-3-15 and
C51-3-4.
3) If OK, then measure voltage between termi-
nal C51-3-20 and ground, E61-9 and
ground with ignition switch ON.
Is each voltage 10 – 14 V?
5 ECM power circuit check :
1) Using service wire, ground terminal E61-9
and measure voltage between terminal
C51-3-15 and ground at ignition switch ON.
Is it 10 – 14 V?
6 Is operating sound of main relay heard in Step
1?
7 Main relay check :
1) Check main relay according to procedure in
Step 3.
Is main relay in good condition?
ENGINE GENERAL INFORMATION AND DIAGNOSIS (H27 ENGINE) 6-1-47
Action Yes
Go to Step 5.
Go to Step 3.
Go to Step 4.
Go to Step 5.
Check ground circuits
"BLK/GRN" and "BLK/
ORN" for open.
If OK, then substitute a
known-good ECM (PCM)
and recheck.
Go to Step 7.
"BLK/RED" or "BLU/BLK"
wire open.
No
Go to Step 2.
Check for short in circuits
connected to this fuse.
Replace main relay.
"BLK/WHT", "BLU" or
"BLK/RED" circuit open.
Go to Step 6.
"BLK/RED" or "BLU/BLK"
wire open.
Replace main relay.