Dtc Index - Honda SH125 Manual

FUEL SYSTEM (Programmed Fuel Injection)
DTC INDEX
The Diagnostic Trouble Codes (DTC) are based upon Malfunction Indicator Lamp (MIL) codes and are displayed as
hyphenated numbers. The digits in front of the hyphen are equal to an MIL code and indicate the Function Failure. The
digit behind the hyphen details the symptom. For example, in the case of the TP sensor, the ECM stores two levels of
information, a function failure and
a
detail of the symptom:
(08
-
1)
= TP sensor voltage
-
lowerthan the specified value
or
(08
-
2) = TP sensor voltage
-
higher than the specified value.
The MAP, ECT, TP and IAT sensor can be mean diagnosis according to the sensor output voltage value.
If the failure occurs, the ECM determines the failure function, the output voltage is high or low compared to the stan-
dard voltage, then read out the DTC to the HDS pocket tester.
For example:
-
If the input voltage line (A) on the MAP sensor is opened, the ECM detects the output voltage is about 5 V, then the
-
If the input voltage line
(B)
on the TP sensor is opened, the ECM detects the output voltage is 0 V, then the DTC 8-1 (TP
DTC 1-2 (MAP sensor circuit high voltage) will be read out.
sensor circuit low voltage) will be read out.
MAP SENSOR
-
ECT SENSOR
n
5 v
-t
5 v TP SENSOR
I,
OUTPUT VOLTAGE
e
OUTPUT VOLTAGE
IAT SENSOR
5 v
1
OUTPUT VOLTAGE
-
t
5v
b
OUTPUT VOLTAGE