Dtc P0116: Engine Coolant Temperature Circuit Range / Performance - Suzuki GRAND VITARA Owner's Manual

1A-91 Engine General Information and Diagnosis:
Step
8 Ground circuit check
1) Remove ECM from its bracket with ECM connectors
connected.
2) Measure resistance between "C37-57" terminal of ECM
connector and vehicle body ground.
Is resistance below 3
9 IAT sensor for performance check
1) Check IAT sensor according to "Mass Air Flow (MAF)
and Intake Air Temperature (IAT) Sensor Inspection: in
Section 1C".
Is it in good condition?

DTC P0116: Engine Coolant Temperature Circuit Range / Performance

Wiring Diagram
15 14 13 12 11
30 29 28 27 26
44
45 43 42 41
59
60 58 57 56
DTC Detecting Condition and Trouble Area
DTC detecting condition
ECT sensor values is less than –10 °C, 14 °F (for M16 engine)
or –5 °C, 23 °F (for J20 engine) while engine is running under
more than specified engine load (more than 1000 rpm) for 2 to
1116 min (depending on ECT at engine start) continuously from
engine start.
(2 driving cycle detecting logic)
Action
Ω
?
1
PPL/YEL
GRY/GRN
3
E23
10 9 8 7 6 5 4 3
25 24 23 22 21 20 19 18
40 39 38 37 36 35 34 33
55 54 53 52 51 50 49 48
"GRY/GRN" wire is
open circuit or high
resistance circuit. Poor
"C37-57" connection.
Substitute a known-
good ECM and recheck.
C37-24
C37-57
GRY/GRN
2 1 15 14 13 12 11
17 16 30 29 28 27 26
44
32 31 45 43 42 41
59
47 46 60 58 57 56
1. ECT sensor
2. ECM
3. To other sensors
• ECT sensor
• ECT sensor circuit
• Thermostat
• ECM
Yes
Faulty ECM ground
circuit. If circuit is OK,
substitute a known-
good ECM and recheck.
Replace MAF and IAT
sensor.
5V
2
C37
10 9 8 7 6 5 4 3
25 24 23 22 21 20 19 18
40 39 38 37 36 35 34 33
55 54 53 52 51 50 49 48
Trouble area
No
S5JB0A1104026
2 1
17 16
32 31
47 46
I5JB0A110038-01