4-28 FI SYSTEM DIAGNOSIS
C23
TO sensor
The sensor voltage should be the fol-
lowing for 2 sec. and more, after igni-
tion switch is turned ON.
0.2 V
sensor voltage < 4.8 V
In other than the above value, C23
(P1651) is indicated.
TO sensor, lead wire/coupler
connection
P1651
H
Sensor voltage is higher than specified
value.
TO sensor signal circuit shorted
to VCC or ground circuit open
L
Sensor voltage is lower than specified
value.
TO sensor signal circuit open or
shorted to ground or VCC circuit
open
C24/C25
Ignition
signal
CKP sensor (pick-up coil) signal is pro-
duced, but signal from ignition coil is
interrupted 8 times or more continu-
ously. In this case, the code C24
(P0351) or C25 (P0352) is indicated.
Ignition coil, wiring/coupler con-
nection, power supply from the
battery
P0351/P0352
C31
Gear
position
signal
Gear position signal voltage should be
higher than the following for 3 seconds
and more.
Gear position signal voltage
0.6 V
If lower than the above value, C31
(P0705) is indicated.
GP switch, wiring/coupler con-
nection, gearshift cam, etc.
P0705
C32/C33
Fuel injector
CKP sensor (pickup coil) signal is pro-
duced, but fuel injector signal is inter-
rupted 4 times or more continuously. In
this case, the code C32 (P0201) or
C33 (P0202) is indicated.
Fuel injector, wiring/coupler con-
nection, power supply to the
injector
P0201/P0202
C40
ISC valve
The circuit voltage of motor drive is
unusual.
ISC valve circuit open or shorted
to ground
P0505
C41
FP relay
No voltage is applied to the fuel pump,
although fuel pump relay is turned ON,
or voltage is applied to fuel pump
although fuel pump relay is turned
OFF.
Fuel pump relay, lead wire/cou-
pler connection, power source to
fuel pump relay and fuel injec-
tors
P0230
H
Voltage is applied to fuel pump
although fuel pump relay is turned
OFF.
Fuel pump relay switch circuit
shorted to power source
Fuel pump relay (switch side)
L
No voltage is applied to the fuel pump,
although fuel pump relay is turned ON.
Fuel pump relay circuit open or
short
Fuel pump relay (coil side)
C41
ECM/PCM
power input
signal
No voltage is applied to the ECM.
Lead wire/coupler connection of
ECM terminal to fuel fuse
P2505
C42
Ignition
switch
Ignition switch signal is not input to the
ECM.
Ignition switch, lead wire/coupler,
etc.
P1650
DTC No.
DETECTED
ITEM
DETECTED FAILURE CONDITION
CHECK FOR