Suzuki 2000 Grand Vitara SQ416, Service Manual

Page: 48 / 729

YH4
GRAND
VITARA
6-44 ENGINE DIAGNOSIS (G16 / J20 ENGINES)
TABLE A-5
INSPECTION
STEP ACTION YES NO
1 Main Relay Operating Sound Check:
Is operating sound of main relay heard at ignition
switch ON? Go to Step 5. Go to Step 2.
2 Fuse Check:
Is main “FI” fuse in good condition? Go to Step 3. Check for short in
circuits connected to
this fuse.
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 6E1.
Is check result satisfactory?
Go to Step 4. Replace main relay.
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 C51-3-20, E61-9, C51-3-15 and
C51-3-4.
3) If OK, then measure voltage between terminal
C51-3-20 and ground, E61-9 and ground with
ignition switch ON.
Is each voltage 10 – 14 V?
Go to Step 5. “B / W”, “Bl” or “B / R”
circuit open.
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?
Check ground circuits
“B / G” and “B / Bl” for
open.
If OK, then substitute a
known-good ECM
(PCM) and recheck. Go to Step 6.
6 Is operating sound of main relay heard in Step 1? Go to Step 7. “B / R” or “Bl / B” wire
open.
7 Main Relay Check:
1) Check main relay according to procedure in
Step 3.
Is main relay in good condition?
“B / R” or “Bl / B” wire
open. Replace main relay.