SsangYong Musso. Manual - part 139
1F-140 ENGINE CONTROLS
SSANGYONG Y158
DIAGNOSTIC TROUBLE CODE (DTC) P0131
O2 BANK 1 SENSOR 1 LOW VOLTAGE
Circuit Description
In order to control emissions, a catalytic converter is
used to convert harmful emissions into harmless water
vapor and carbon dioxide.
The Engine Control Module (ECM) has the ability to
monitor this process by using a Heated Oxygen Sensor
(O2S 1). The O2S 1 produces an output signal which
indicates the storage capacity of the catalyst. This in
turn indicates the catalyst’s ability to convert exhaust
emissions effectively.
If the O2S 1 pigtail wiring, connector, or terminal is
damaged, the entire O2S 1 assembly must be replaced.
Do not attempt to repair the wiring, connector, or
terminals. In order for the sensor to function properly, it
must have a clean air reference provided to it. This clean
air reference is obtained by way of the O2S 1 wire(s).
Any attempt to repair the wires, connector, or terminal
and degrade the O2S 1 performance.
Conditions for Setting the DTC
•••••
O2S 1 voltage is less than 0.15 volt.
•••••
O2S 2 voltage is greater than 0.6 volt (2.3L DOHC).
•••••
O2S 2 voltage is greater than 0.55 volt (3.2L DOHC).
•••••
Air mass is greater than 50 kg/h (2.3L DOHC).
•••••
Air mass is greater than 100 kg/h (3.2L DOHC).
•••••
Lambda control status is enabled.
•••••
Lambda control status is at rich stop.
•••••
Injectors 1 ~ 4 status is active (2.3L DOHC).
•••••
Injectors 1 ~ 6 status is active (3.2L DOHC).
Action Taken When the DTC Sets
•••••
The Malfunction Indicator Lamp (MIL) will illuminate
after two consecutive driving cycles in which the diag-
nostic runs with the fault active.
•••••
The ECM will record operating conditions at the time
the diagnostic fails. This information will be stored in
the Freeze Frame and Failure Records buffers.
•••••
A history DTC is stored.
Conditions for Clearing the MIL/DTC
•••••
The MIL will turn off after three consecutive driving
cycles in which the diagnostic runs without a fault.
•••••
A history DTC will clear after 40 consecutive warm-
up cycles without a fault.
•••••
The DTC(s) can be cleared by using the scan tool.
Diagnostic Aids
An intermittent may be caused by rubbed-through wire
insulation or a wire contacting the exhaust.
•••••
Exhaust system - Inspect the exhaust system for
leaks. Check the exhaust between the three-way cat-
alytic converter and the flange for leaks, corrosion,
or for loose or missing hardware and repair as neces-
sary.
•••••
Poor connection or damaged harness - Ensure that
the O2S 1 pigtail is not contacting the exhaust. heck
for the following conditions:
•••••
improper mating
YAB1F130