Dtc P0128: Cooling System Malfunction ('02-03 Models) - Honda S2000 Service Manual

PGM-FI System
DTC Troubleshootihg (cont'd)
DTG P0128: Cooling System Malfunction
('02-03 modelsl
NOTE: lf the DTCS listed below are stored at the same
time as DTC P0128. troubleshoot those DTCs first. then
recheck for P0128.
P0107, P0108, P1128, P1129t Manifold Absolute
Pressure (MAP) Sensor
P 1 1 0 6 , P ' 1 1 0 7 , P 1 1 0 8 : B a r o m e t r i c P r e s s u r e ( B A R O )
Sensor
P1259: VTEC System
P 0 1 1 6 , P 0 1 1 7 . P 0 1 1 8 : E n g i n e C o o l a n t T e m p e r a t u r e
(ECT) Sensor
P 0 1 1 2 , P 0 1 1 3 : I n t a k e A i r T e m p e r a t u r e ( l A T ) S e n s o r
P0335, P0336: Crankshaft Position (CKP) Sensor
P0300: Random Misfire
P 0 3 0 1 , P 0 3 0 2 , P 0 3 0 3 , P 0 3 0 4 : N o . 1 , N o . 2 , N o . 3 o r N o . 4
Cylinder Misfire
P0505: ldle control System
P 1 5 1 9 : l d l e A i r C o n t r o l ( l A C ) V a l v e
DTC P0128 can occasionally set when the hood is
opened while the engine is running.
1. Check the engine coolant level
ls the engine coolant level low?
YES Refillthe engine coolant. lf necessary, repair
t h e c o o l i n g l e a k a g e . I
N O - G o t o s t e p 2 .
2. Turn the ignition switch ON (ll), and make sure the
A,/C is off.
3. Check the radiator fan.
Does the radiatot fan keep running?
YES Check the radiator fan circuit (see page 10-
15). radiator fan switch circuit (see page 10-17), and
the radiator fan switch (see page 10-18). lf they are
OK, substitute a known-good ECM and recheck (see
page 11-5). lf the symptom/indicator goes away,
r e p l a c e t h e o r i g i n a l E C M . I
NO- Replace the thermostat lsee page 10-10).1
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