Suzuki Grand Vitara XL-7 Service Manual page 90

6-30 ENGINE DIAGNOSIS (RHZ ENGINE WITH SINGLE-CONNECTOR ECM)
TABLE A-3
INSPECTION
STEP
1 Double Relay Operating Sound Check:
Is operating sound of double relay heard at ignition
switch ON?
2 Fuse Check:
Is main "FI" fuse in good condition?
3 Double Relay Check:
1) Turn OFF ignition switch and remove double
relay.
2) Check for proper connection to double relay at
terminal 3 and 10.
3) If OK, check double relay referring to "Double
Relay Inspection" in Section 6E3.
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 C51-69, C51-86, C51-29 and C51-1.
3) If OK, then measure voltage between terminal
C51-69 and ground, C51-86 and ground with
ignition switch ON.
Is each voltage 10 – 14 V?
5 ECM Power Circuit Check:
1) Using service wire, ground terminal C51-86 and
measure voltage between terminal C51-29 and
ground, C51-1 and ground at ignition switch ON.
Is it 10 – 14 V?
6 Is operating sound of double relay heard in Step 1?
7 Double Relay Check:
1) Check double 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" for open.
If OK, then substitute a
known-good ECM
(PCM) and recheck.
Go to Step 7.
"WHT /YEL" or
"BLU/BLK" wire open.
NO
Go to Step 2.
Check for short in
circuits connected to
this fuse.
Replace main relay.
"BLK/WHT",
"YEL/GRN" or
"WHT /YEL" circuit
open.
Go to Step 6.
"WHT /YEL" or
"BLU/BLK" wire open
Replace double relay.