Suzuki GRAND VITARA XL-7 Owner's Manual page 214

TROUBLESHOOTING
Step
1 Was "ENGINE DIAG. FLOW TABLE" per-
formed?
2 Check ECT sensor and its circuit :
1) Connect scan tool with ignition switch OFF.
2) Turn ignition switch ON.
3) Check engine coolant temp. displayed on
scan tool.
Is – 40°C (– 40°F) or 164°C (327°F) indicated?
3 Check wire harness :
1) Disconnect ECT sensor connector with igni-
tion switch OFF.
2) Check for proper connection to ECT sensor
at "ORN/BLK" and "GRY/YEL" wire termi-
nals.
If OK, then with ignition switch ON, is voltage
applied to "ORN/BLK" wire terminal about 4 – 6
V?
4 Check wire harness :
1) Using service wire, connect ECT sensor
connector terminals.
2) Turn ignition switch ON and check engine
coolant temp. displayed on scan tool.
Is 164°C (327°F) indicated?
ENGINE GENERAL INFORMATION AND DIAGNOSIS (H27 ENGINE) 6-1-53
Action Yes
Go to Step 2.
Go to Step 3.
Go to Step 4.
Replace ECT sensor.
No
Go to "ENGINE DIAG.
FLOW TABLE" in this
section.
Intermittent trouble.
Check for intermittent
referring to "INTERMIT-
TENT AND POOR CON-
NECTION" in Section 0A.
"ORN/BLK" wire open or
short, or poor C51-3-2
connection.
If wire and connection are
OK, substitute a known-
good ECM (PCM) and
recheck.
"GRY/YEL" wire open or
poor C51-3-23 connec-
tion.
If wire and connection are
OK, substitute a known-
good ECM (PCM) and
recheck.