Isuzu C22NE Workshop Manual page 337

Digitally Controlled Signal To Noise Enhancement Filter Failure (Cont'd)
Step
1. Re-Connect the KS Sensor in order to monitor the
voltage between the KS sensor terminal and the engine
ground.
6 2. Tap on the engine lift bracket, near the KS Sensor,
while observing the signal indicated on the Scan Tool.
Is any signal indicated on the while tapping on the engine
lift bracket?
1. Turn OFF the ignition.
2. Disconnect the ECM.
3. Turn ON the ignition.
4. Check the KS signal circuit between the ECM and the
7
KS sensor connector for an open, a short to voltage, or
a short to ground.
5. If a wiring problem is found, repair as necessary.
Was a problem found?
Replace the KS Sensor. Refer to Knock Sensor.
8
Is action complete?
Replace the EPROM or ECM.
9
Is the action complete?
1. Using the Scan Tool, select the DTC and the Clear
Info.
2. Start the Engine.
3. Idle at the normal operating temperature.
4. Select Specific DTC.
10
5. Enter the DTC number which was set.
6. Operate the vehicle within the conditions for setting this
DTC as specified in the supporting text.
Does the Scan Tool indicate that this diagnostic ran and
passed?
Using the Scan Tool, select the Capture Info and the
Review Info.
11 Are any DTC displayed that have not been diagnosed?
DTC (Flash DTC = 18)
Action
Note) Refer to 6E1-243.
DRIVEABILITY AND EMISSIONS 6E1-167
Value(s) Yes
-
Go to Step 10
-
Go to Step 10
-
Go to Step 10
-
Go to Step 10
-
Go to Step 11
Go to the
applicable
- Diagnostic
Trouble Code
table
No
Go to Step 7
Go to Step 9
-
-
Go to Step 2
System OK