Isuzu C22NE Workshop Manual page 313

Step
1. Ignition OFF.
2. With the ECM disconnected, check continuity of the
HO2S high circuit.
7
3. If the HO2S high circuit measures over 0.5 ohms,
repair open or poor connection as necessary.
Was a HO2S high circuit problem found and corrected?
1. Ignition OFF.
2. With the ECM disconnected, check continuity of the
HO2S low circuit.
8
3. If the HO2S low circuit measures over 5 ohms, repair
open or poor connection as necessary.
Was a HO2S low circuit problem found and corrected?
1. Ignition ON, engine OFF.
2. Disconnect HO2S and jumper the HO2S high and low
circuits (ECM side) to ground.
9
3. Using a Scan Tool, monitor HO2S voltage.
Is HO2S voltage approximately equal to the specified
value?
Replace HO2S.
10
Is the action complete?
Replace the EPROM or ECM.
11
Is the action complete?
DTC (Flash DTC = 13)
O2 Sensor Circuit Not Ready (Cont'd)
Action
Note) Refer to 6E1-243.
DRIVEABILITY AND EMISSIONS 6E1-143
Value(s) Yes
-
Verify repair
-
Verify repair
10mV Go to Step 10
-
Verify repair
-
Verify repair
No
Go to Step 8
Go to Step 9
Go to Step 11
-
-