Suzuki Engine 2002 GRAND VITARA SQ420 Service Manual page 65

6-60 ENGINE GENERAL INFORMATION AND DIAGNOSIS (G16/J20 ENGINES)
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 "BLK/RED" wire and "BLU" wire.
3) If OK, check main relay for resistance and
operation referring to "Main Relay" in Sec-
tion 6E1.
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?
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/
BLU" 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.