Suzuki 2000 Grand Vitara SQ625 Service Manual page 162

TROUBLESHOOTING
STEP
1 Main Relay Operating Sound check:
Is operating sound of main relay heard at ignition switch
ON?
2 Fuse check:
Is fuse 8 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 E07-2 and E07-4.
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 connectors
from ECM (PCM) and install main relay.
2) Check for proper connection to ECM (PCM) at
terminals C51-2-3, 20, 21 and E61-8.
3) If OK, then measure voltage between terminal
C51-2-3 and ground, E61-8 and ground with
ignition switch ON.
Is each voltage 10 – 14 V?
5 ECM Power Circuit check:
1) Using service wire, ground terminal E61-8 and
measure voltage between terminal C51-2-20
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
ENGINE (H25 ENGINE) 6-1-51
YES
Go to Step 5.
Go to Step 3.
Go to Step 4.
Go to Step 5.
Check ground
circuits "B/G" and
"B/Bl" for open.
If OK, then substitute
a known-good ECM
(PCM) and recheck.
Go to Step 7.
"B/R" or "Bl" wire
open.
NO
Go to Step 2.
Check for short in
circuits connected
to this fuse.
Replace main relay.
"B/W", "Bl" or "B/R"
circuit open.
Go to Step 6.
"B/R" or "Bl" wire
open.
Replace main relay.