Engine General Information and Diagnosis: 1A-26
C40/P0505
ISC valve
The circuit voltage of motor drive is unusual.
ISC valve circuit open or
shorted to the ground
C40/P0506
Idle speed is lower than the desired idle
speed.
Air passage clogged
ISC valve fixed
ISC valve pre-set position is
incorrect
C40/P0507
Idle speed is higher than the desired idle
speed.
ISC valve hose connection
ISC valve is fixed
ISC valve pre-set position is
incorrect
C41
Fuel pump 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/
coupler connection, power
source to fuel pump relay and
fuel injectors
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/P2505
ECM power input
signal
No voltage is applied to the ECM, although FP
relay is turned ON.
Lead wire/coupler connection
of ECM terminal to fuel fuse,
Fuel fuse, Power source of
speedometer shorted to
ground.
C42
Ignition switch Ignition switch signal is not input to the ECM.
Ignition switch, lead wire/
coupler, etc.P1650
C44
HO2 sensor (HO2S)
HO2 sensor output voltage is not input to ECM
during engine operation and running
condition.
(Sensor voltage > 1.0 V)
C44 (P0130) is indicated.
HO2S sensor circuit open or
shorted to the power source,
HO2 sensor lead wire/coupler
connection.
P0130
C44
The Heater can not operate so that heater
operation voltage is not supply to the oxygen
heater circuit, C44 (P0135) is indicated.
Heated circuit open or shorted
to the ground
Battery voltage supply to the
HO2 sensor
P0135
C49 PAIR control solenoid
valve
PAIR control solenoid valve voltage is not
input to ECM.
PAIR control solenoid valve,
lead wire/couplerP1656
C60
Cooling fan relay Cooling fan relay signal is not input to ECM.
Cooling fan relay, lead wire/
coupler connectionP0480
Malfunction
Code
Detected Item Detected Failure Condition Check For
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