Dtc P0138 Heated Oxygen Sensor (Ho2S 2) High Voltage - Daewoo CIELO EURO III Manual

1F – 177 ENGINE CONTROLS

DTC P0138 Heated Oxygen Sensor (HO2S 2) High Voltage

Step
Perform an On-Board Diagnostic (EOBD) System
Check.
1
Is the system check complete?
1. Turn the ignition ON, with the engine OFF.
2. Install a scan tool.
2
Is the Heated Oxygen Sensor (HO2S 2) voltage
above the specified value?
1. Turn the ignition ON, with the engine OFF.
2. Review the Freeze Frame data and note the
parameters.
3
3. Operate the vehicle within the Freeze Frame
conditions and Conditions For Setting The DTC
as noted.
Is the HO2S 2 voltage above the specified value?
1. Turn the ignition switch OFF.
2. Disconnect the HO2S 2 electrical connector.
3. Disconnect the
engine control module (ECM) electrical
connector.
4
4. With a Digital Voltmeter (DVM) connected to
ground, probe the HO2S signal circuit, terminal
K36
Does the DVM indicate a voltage of the specified
value?
1. Reconnect the ECM electrical connectors.
2. Turn the ignition switch ON, with the engine OFF.
3. Jumper the high and low circuits at the HO2S 2
5
electrical connector, terminals A and B to ground.
Does the scan tool indicate the HO2S 2 voltage be-
low the specified value?
Repair the short to voltage in the HO2S 2 signal cir-
cuit.
6
Is the action complete?
1. Turn the ignition switch OFF.
7 2. Replace the HO2S 2.
Is the action complete?
1. Turn the ignition switch OFF.
8 2. Replace the ECM.
Is the action complete?
1. Using the scan tool, clear the DTCs.
2. Start the engine and idle at normal operating
temperature.
3. Operate the vehicle within the Conditions for
9
setting this DTC as specified in the supporting
text.
Does the scan tool indicate that this diagnostic has
run and passed?
Check if any additional DTCs are set.
10
Are any DTCs displayed that have not been diag-
nosed?
Action Value Yes
–
Go to Step 2
900 mv Go to Step 4
900 mv Go to Step 4
0 v ( r 0 .5 v) Go to Step 5
100 mv
Go to Step 7
(0.10 v)
–
Go to Step 9
–
Go to Step 9
–
Go to Step 9
–
Go to Step 10
– Go to applicable
DTC table
No
Go to "On-
Board Diag-
nostic System
Check"
Go Step 3
Go to Step 9
Go to Step 6
Go to Step 8
–
–
–
Go to Step 2
System OK
DAEWOO T-154 BL2,3