1A-88 Engine Control System
Diagnostic Chart
CAUTION:
The values in "Judgment criteria" may vary
depending on measurement conditions.
Chart 1 (1/3)
DTC
Fault
CHECK
ENGINE
lamp status
Judgment start conditions
Judgment criteria
Fail-safe
14
CMP Sensor System Fault
ON
(idling only)
The battery voltage is at least 16 V
and the starter switch is turned on.
No CMP signal is input while the
CKP signal is input to the ECM 450
times.
When the CKP sensor is sound, the
ECM will control the powertrain
using the CKP signal.
15
CKP Sensor System Fault
ON
(idling only)
The battery voltage is at least 16 V
and the starter switch is turned on.
No CKP signal is input while the
CMP signal is input to the ECM 40
times.
When the CMP sensor is sound, the
ECM will control the powertrain
using the CMP signal.
18
(VIM)
Starter degradation
(MT vehicles)
ON
(blinks 10
times and
turns off)
—
The manual transmission vehicle is
in idle stop and the accumulated
number of startups exceeds 150000.
—
22
IAT Sensor System Fault
ON
—
The IAT sensor output voltage
deviates from the range between 0.1
V and 4.9 V for at least 2.9 seconds.
The ECM controls the powertrain
using the set intake air temperature
(normal running phase: 25°C,
startup phase: –20°C).
23
ECT Sensor System Fault
ON
—
The ECT sensor output voltage
deviates from the range between 0.1
V and 4.9 V for at least 1 second.
The ECM controls the powertrain
using the set engine coolant
temperature (normal running phase:
55°C, startup phase: –20°C).
24
Accelerator Sensor
System Fault
ON
—
The AP sensor output voltage
deviates from the range between 0.1
V and 4.8 V for at least 1 second.
The ECM controls the accelerator
pedal position according to the
signals from the idle position switch.
25
(VIM)
Vehicle Speed Sensor
System Fault
ON
—
The state where clutch and neutral
switches are in normal condition, the
automatic transmission or clutch
switch is turned off, the engine is
running at 2200 rpm or more, the
neutral switch is turned off, and the
vehicle speed is 0 km/h lasts 5
seconds.
—
28
(VIM)
PTO Accelerator Sensor
System Fault
—
—
The PTO accelerator sensor output
signal exceeds 4.9 V for 1 second.
The ECM controls the powertrain
using the set PTO accelerator
oposition (0 %).
31
(VIM)
Idle Up Volume System
Fault
—
—
The idle up volume output signal
deviates from the range between 0.2
V and 4.8 V for 1 second.
The idle up volume switch is
disabled.
33
(VIM)
VIM Internal Fault
(EEPROM Write Error)
—
—
The stored count values do not
agree each other when the starter
switch position is changed from OFF
to ON.
Counted and stored values are
reset.
34
ECM Internal Fault
(Charge Circuit Fault)
ON
The battery voltage is at least 16 V,
the starter switch is turned on, and
the post injection is not performed.
The charge circuit voltage in the
ECM is excessively high or low.
All injectors are stopped.
35
(VIM)
VIM Internal Fault
(A/D Conversion Fault)
ON
—
The A/D (analog-to-digital)
conversion is not complete in the
VIM.
Fault judgment is disabled on PTO
accelerator sensor, atmospheric
pressure sensor, and idle up
volume.
43
ITP Sensor System Fault
ON
—
The ITP sensor output voltage
deviates from the range between 0.1
V and 4.9 V for at least 3 seconds.
—
44
EGR Valve Position
Sensor System Fault
ON
—
The EGR valve position sensor
output voltage deviates from the
range between 0.3 V and 4.6 V for at
least 3 seconds.
—
45
EGR Valve System Fault
ON
The starter switch is turned on for at
least 3 seconds, the EGR valve
position sensor is in normal
condition, neither #2 - 5 V Power
Supply Fault nor A/D Conversion
Fault is detected, and the battery
voltage stays between 16 V and 32
V.
The valve drive voltage is
excessively high for at least 10
seconds.
—
46
(VIM)
Exhaust Brake System
Fault
(ON circuit open wiring)
ON
—
With the battery voltage at 20 V or
more, the engine speed at 500 rpm
or more, and the exhaust brake
turned on, the solenoid valve is
turned off for 1 second.
The exhaust brake system is
disabled.
Exhaust Brake System
Fault
(OFF circuit open wiring)
With the battery voltage at 20 V or
more, the engine speed at 500 rpm
or more, and the exhaust brake
turned off, the solenoid valve is
turned on for 1 second.
