1F-264 ENGINE CONTROLS
SSANGYONG Y158
Circuit Description
The Engine Control Module (ECM) has six (four-2.3L
DOHC) individual in jector driver circuits, each of which
controls an injector. When a driver circuit is grounded
by the ECM, the injector is activated. The ECM monitors
a voltage drop through a fixed resistor and controls it.
The voltage on each driver is monitored to detect a fault.
If the voltage is not what the ECM expects to monitor
on the circuit, a Diagnostic Trouble Code (DTC) is set.
This DTC detects a short to ground and/or an open
circuit conditions for low-side drive injector outputs.
Conditions for Setting the DTC
•••••
Voltage is less than 1/3 of battery voltage for ground.
•••••
Voltage is less than 2/3 of battery voltage for open.
Action Taken When the DTC Sets
•••••
The MIL will illuminate after two consecutive driving
cycles in which the diagnostic runs with the fault ac-
tive.
•••••
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.
DIAGNOSTIC TROUBLE CODE (DTC) P0264
INJECTOR 2: SHORT CIRCUIT TO GROUND OR OPEN
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 injector driver circuit that is open or shorted to ground
will cause a DTC P0264 to set. It will also cause a mis-
fire due to an inoperative injector. A misfire DTC should
also be set indicating which injector is inoperative.
The injector resistance tested at the ECM connection
is slightly more than if tested directly at the injector be-
cause it includes resistance of the harness wires. The
normal value is about 14.5 - 15
Ω
.
YAB1F170