Suzuki 2000 Grand Vitara SQ625 Service Manual page 168

D Atmospheric pressure: higher than 560 mmHg (Altitude: lower than 2790 m (9150 ft))
D Intake air temperature: between –14_C and 70_C (6.8_F and 158_F)
(1) With ignition switch OFF, connect scan tool.
(2) Turn ON ignition switch, clear DTC if any.
(3) Start engine and run it for 10 sec.
(4) Check DTC by using scan tool.
DTC TROUBLESHOOTING
STEP
1 Was "ENGINE DIAG. FLOW TABLE" performed?
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 205_C (401_F) indicated?
3 Check Wire Harness.
1) Disconnect ECT sensor connector.
2) Check engine coolant temp. displayed on scan tool.
Is –40_C (–40_F) indicated?
4 Does scan tool indicate –40_C (–40_F) at Step 2.
5 Check Wire Harness.
1) Disconnect ECT sensor connector (1) with ignition
switch OFF.
2) Check for proper connection to ECT sensor at
"Gr /Y" and "Or/B" wire terminals.
3) If OK, then with ignition switch ON, is voltage
applied to "Or/B" wire terminal about 4.5 – 5.5 V?
6 Check Wire Harness.
1) Using service wire (2), connect ECT sensor
connector terminals. See Fig. 2.
2) Turn ignition switch ON and check engine coolant
temp. displayed on scan tool.
Is 205_C (401_F) indicated?
Fig. for STEP 5
ACTION YES
Go to Step 2.
Go to Step 3.
Replace ECT sensor.
Go to Step 6.
Go to Step 4.
Replace ECT sensor.
Fig. for STEP 6
ENGINE (H25 ENGINE) 6-1-57
NO
Go to "ENGINE
DIAG. FLOW
TABLE".
Intermittent trouble.
Check for intermittent
referring to
"Intermittent and
Poor Connection" in
Section 0 A.
"Or/B" wire shorted
to ground.
If wire is OK,
substitute a known-
good ECM and
recheck.
Go to Step 5.
"Or/B" wire open or
shorted to power, or
poor C51-3-22
connection.
If wire and
connection are OK,
substitute a known-
good ECM and
recheck.
"Gr/Y" wire open or
poor C51-3-20
connection.
If wire and
connection are OK,
substitute a known-
good ECM and
recheck.