[vorl. GELÖST] S10 Blazer - OMVL Millenium drin und schon kommt (immer der gleiche) Fehlercode...

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What does that mean? A knock sensor tells the engine computer when one or more of your engine's cylinders are "knocking", that is, exploding the air/fuel mixture in a way that delivers less power and can be damaging to the engine if prolonged. The computer uses this information to tune the engine so that it doesn't knock. If your knock sensor wasn't operating properly, so that it was always indicating a knock, the engine computer's response may have been to change the ignition timing on your engine. Knock sensors generally bolt into or thread into the engine block. This P0325 code may show up intermittently or the Service Engine light may be lit constantly. Other knock sensor related DTC codes include P0330. Symptoms You may notice drivability problems including a lack of power and perhaps some hesitation. There may also be other symptoms. Causes A code P0325 most likely means one or more of the following has happened: The knock sensor is faulty and needs to be replaced There is a wiring short/fault in the knock sensor circuit Possible Solutions Check the resistance of the knock sensor (compare it to factory specs) Check for broken/frayed wires leading to the sensor Replace the knock sensor

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DTC P0325 Knock Sensor Module Performance

Circuit Description

The control module contains a removable knock sensor (KS) module which receives the knock sensor input. The knock sensor signal input is filtered by this module before it is input to the controls module. Spark knock is continuously monitored during engine operation. If knock occurs for longer than a calibrated time, this diagnostic trouble code (DTC) will set.

Conditions for Running the DTC

DTC P0327 is not active
The engine run time is 120 seconds or greater.
The system voltage is between 10-17.1 volts.
Conditions for Setting the DTC

The VCM detects engine knock for more than 5 seconds.

Action Taken When the DTC Sets

The control module illuminates the malfunction indicator lamp (MIL) the first time the diagnostic runs and fails.
The control module will set the DTC and records the operating conditions at the time the diagnostic fails. The control module stores the failure information in the scan tools Freeze Frame/Failure Records.
Conditions for Clearing the MIL or DTC

The control module turns OFF the MIL after 3 consecutive drive trips when the test has run and passed.
A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles. A warm-up cycle occurs when the coolant temperature has risen 22°C (40°F) from the startup coolant temperature and the engine coolant reaches a temperature that is more than 70°C (158°F) during the same ignition cycle.
Use a scan tool in order to clear the DTCs.
Diagnostic Aids

Check for the following conditions:

A damaged or improperly installed KS module. Check for the following items:
Bent pins
Deformed terminals
A KS module that is not completely seated
An improperly torqued knock sensor -- Torque the knock sensor to 19 N·m (14 lb ft). Refer to

Notice

Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage.

.
A misrouted wiring harness
Refer to Symptoms

Review the Fail Records vehicle mileage since the diagnostic test last failed to determine how often the conditions occur that caused the DTC to set . This may assist in diagnosing the condition.

An intermittent may be caused by any of the following conditions:

A poor connection
Rubbed through wire insulation
A broken wire inside the insulation
Thoroughly check any circuitry that is suspected of causing the intermittent complaint. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.

If a repair is necessary, refer to Wiring Repairs or Connector Repairs in Wiring Systems.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

This step ensures that the condition is present.

This step checks for an improperly installed Knock Sensor module.

Step

Action

Value(s)

Yes

No

1

Important

Before clearing the DTCs, use the scan tool Capture Info to save the Freeze Frame and Failure Records for reference. The control module's data is deleted once the Clear Info function is used.

Did you perform the Powertrain On-Board Diagnostic (OBD) System Check?

--

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

2

Important

If you can hear the engine knock, repair the engine mechanical problem before proceeding with this diagnostic.

Operate the engine within the conditions specified in Conditions for Running the DTC.
Monitor the Specific DTC info for the DTC P0325 until the test runs with the scan tool.
Does the scan tool indicate the DTC P0325 Failed This Ignition?

--

Go to Step 4

Go to Step 3

3

Turn ON the ignition leaving the engine OFF.
Review the scan tool Failure Records data for DTC P0325.
Record the scan tool Failure Records data for DTC P0325.
Operate the vehicle within the Failure Records conditions.
Monitor the Specific DTC info for DTC P0325 until the test runs with the scan tool.
Does the scan tool indicate DTC P0325 test Failed This Ignition?

--

Go to Step 4

Go to Diagnostic Aids

4

Check the KS signal circuit wiring for incorrect routing near the secondary wires. Repair as necessary.

Did you find a problem?

--

Go to Step 9

Go to Step 5

5

Check the Knock Sensor module for incorrect installation. Repair as necessary. Refer to VCM Replacement/Programming .

Did you find a problem?

--

Go to Step 9

Go to Step 6

6

Replace the knock sensor module. Refer to VCM Replacement/Programming .

Is the action complete?

--

Go to Step 7

--

7

Using the scan tool, clear the DTCs.
Start the engine.
Allow the engine to idle until the engine reaches normal operating temperature.
Select DTC and the Specific DTC function.
Enter the DTC number that was set.
Operate the vehicle, within the Conditions for Setting this DTC, until the scan tool indicates the diagnostic Ran.
Does the scan tool indicate the diagnostic Passed?

--

Go to Step 10

Go to Step 8

8

Replace the VCM.
Program the new VCM. Refer to VCM Replacement/Programming .
Perform the Passlock Reprogramming Procedure. Refer to Password Learn Procedure .
Perform the CKP System Variation Learn Procedure. Refer to CKP System Variation Learn Procedure .
Is the action complete?

--

Go to Step 9

--

9

Using the scan tool, clear the DTCs.
Start the engine.
Allow the engine to idle until the engine reaches normal operating temperature.
Select DTC and the Specific DTC function.
Enter the DTC number that was set.
Operate the vehicle, within the Conditions for Setting this DTC, until the scan tool indicates the diagnostic Ran.
Does the scan tool indicate the diagnostic Passed?

--

Go to Step 10

Go to Step 2

10

Does the scan tool display any additional undiagnosed DTCs?

--

Go to the applicable DTC table

System OK

DTC P0327 Knock Sensor (KS) Circuit

The control module uses the knock sensors (KS) in order to detect engine detonation. Ignition control (IC) spark timing is retarded based on the KS signal input when spark knock is detected.

The control module monitors normal engine background noise during warm engine operation. It stores these noise values for comparison to the current knock sensor signal in order to help discriminate between normal engine noise and knock. If the amount of noise is below the minimum stored noise value, this diagnostic trouble code (DTC) will set.

Conditions for Running the DTC

No active ECT sensor DTCs
No active TP sensor DTCs
The timing retard is 0 degrees or less.
The system voltage is between 10-17 volts.
The ECT is 60°C (140°F) or more.
The engine run time is 120 seconds or more.
The knock sensor noise is less than 3 counts.
The engine speed is between 2000-3000 RPM.
The throttle position is more than 6 percent.
Conditions for Setting the DTC

The difference between the actual noise value and the learned minimum noise value is less than 50 counts or more than 200 counts.

Action Taken When the DTC Sets

The control module illuminates the malfunction indicator lamp (MIL) if a failure is detected during 2 consecutive key cycles.
The control module sets the DTC and records the operating conditions at the time the diagnostic failed. The failure information is stored in the scan tool Freeze Frame/Failure Records.
Conditions for Clearing the MIL or DTC

The control module turns OFF the MIL after 3 consecutive drive trips when the test has run and passed.
A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles. A warm-up cycle occurs when the coolant temperature has risen 22°C (40°F) from the startup coolant temperature and the engine coolant reaches a temperature that is more than 70°C (158°F) during the same ignition cycle.
Use a scan tool in order to clear the DTCs.
Diagnostic Aids

Check for the following conditions:

A misrouted harness. Ensure that the knock sensor harness is not routed too close to high voltage wires such as spark plug leads.
An improperly torqued knock sensor. Torque the knock sensor to 19 N·m (14 lbs ft). Refer to

Notice

Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage.

in Cautions and Notices.
Review the Fail Records vehicle mileage since the diagnostic test last failed to determine how often the conditions occur that caused the DTC to set. This may assist in diagnosing the condition.

An intermittent may be caused by any of the following conditions:

A poor connection
Rubbed through wire insulation
A broken wire inside the insulation
Thoroughly check any circuitry that is suspected of causing the intermittent complaint. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.

If a repair is necessary, refer to Wiring Repairs or Connector Repairs in Wiring Systems.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

Ensures that the condition is present.

Ensures that the knock sensor is capable of detecting detonation. Striking the lift bracket with a non-metallic object should produce a signal that the knock sensor should detect.

Ensures that the 5 volt reference is near the specified value without being more than 5.2 volts.

Step

Action

Value(s)

Yes

No

1

Important

Before clearing the DTCs, use the scan tool Capture Info to save the Freeze Frame and Failure Records for reference. The control module's data is deleted once the Clear Info function is used.

Did you perform the Powertrain On-Board Diagnostic (OBD) System Check?

--

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

2

Operate the engine within the Conditions for Running the DTC in the supporting text.
Monitor the Specific DTC info for DTC P0327 until the DTC P0327 test runs with a scan tool.
Observe the test results.
Does the scan tool indicate the DTC P0327 Failed This Ignition?

--

Go to Step 4

Go to Step 3

3

Turn ON the Ignition leaving the engine OFF.
Review the scan tool Fail Records data.
Record the scan tool Fail Records data for DTC P0327.
Operate the vehicle within the Failure Records conditions.
Monitor the Specific DTC info for the DTC P0327 until the DTC P0327 test runs with the scan tool.
Observe the test results.
Does the scan tool indicate the DTC P0327 Failed This Ignition?

--

Go to Step 4

Go to Diagnostic Aids

4

Disconnect the knock sensor harness connector.
Measure the resistance of the Knock Sensor by connecting the J 39200 DMM between the knock sensor terminal and the engine block.
Is the resistance of the knock sensor near the specified value?

100K ohms

Go to Step 5

Go to Step 14

5

Monitor the frequency between the KS terminal and the engine ground with a J 39200 DMM set to the hz scale.
Observe the signal indicated on the J 39200 DMM while tapping on the engine lift bracket with a nonmetallic object.
Is any signal indicated on the J 39200 DMM while tapping on the engine lift bracket?

--

Go to Step 6

Go to Step 14

6

Check the KS signal circuit for a poor terminal connection at the knock sensor. Repair as necessary. Refer to Connector Repairs in Wiring Systems.

Did you find a problem?

--

Go to Step 20

Go to Step 7

7

Turn ON the ignition leaving the engine OFF.
Measure the voltage on the KS signal circuit at the Knock Sensor harness connector with a J 39200 DMM connected to a ground.
Is the voltage near the specified value?

5 V

Go to Step 15

Go to Step 8

8

With the J 39200 DMM still connected to the Knock Sensor harness connector.

Is the voltage more than the specified value?

5.2 V

Go to Step 9

Go to Step 10

9

Turn OFF the ignition.
Disconnect the VCM C2 connector.
Probe the KS signal circuit at the KS harness connector with a J 39200 DMM connected to a ground.
Is the voltage more than the specified value?

0 V

Go to Step 13

Go to Step 19

10

Turn OFF the ignition.
Check the KS signal circuit between the VCM and the KS harness connector for an open or high resistance.
Repair as necessary. Refer to Wiring Repairs in Wiring Systems.
Did you find a problem?

--

Go to Step 20

Go to Step 11

11

Probe the KS harness connector with a test lamp connected to B+.

Is the test lamp ON?

--

Go to Step 12

Go to Step 15

12

Repair the short to ground in the KS signal circuit. Refer to Wiring Repairs in Wiring Systems.

Is the action complete?

--

Go to Step 20

--

13

Repair the short to voltage in the KS signal circuit. Refer to Wiring Repairs in Wiring Systems.

Is the action complete?

--

Go to Step 20

--

14

Replace the knock sensor. Refer to Knock Sensor (KS) Replacement .

Is action complete?

--

Go to Step 20

--

15

Turn OFF the ignition.
Disconnect the VCM C2 connector.
Check the KS signal circuit for a poor connection at the VCM.
Repair as necessary. Refer to Wiring Repairs in Wiring Systems.
Did you find a problem?

--

Go to Step 20

Go to Step 16

16

Check the Knock Sensor module for not being fully seated or for incorrect installation. Refer to VCM Replacement/Programming .

Did you find a problem?

--

Go to Step 20

Go to Step 17

17

Replace the knock sensor module. Refer to VCM Replacement/Programming .

Is the action complete?

--

Go to Step 18

--

18

Using the scan tool, clear the DTCs.
Start the engine.
Allow the engine to idle until the engine reaches normal operating temperature.
Select DTC and the Specific DTC function.
Enter the DTC number that was set.
Operate the vehicle, within the Conditions for Setting this DTC, until the scan tool indicates the diagnostic Ran.
Does the scan tool indicate the diagnostic Passed?

--

Go to Step 21

Go to Step 19

19

Replace the VCM.
Program the new VCM. Refer to VCM Replacement/Programming .
Perform the Password Learn Procedure. Refer to Password Learn Procedure .
Perform the CKP System Variation Learn Procedure. Refer to CKP System Variation Learn Procedure .
Is the action complete?

--

Go to Step 20

--

20

Using the scan tool, clear the DTCs.
Start the engine.
Allow the engine to idle until the engine reaches normal operating temperature.
Select DTC and the Specific DTC function.
Enter the DTC number that was set.
Operate the vehicle, within the Conditions for Setting this DTC, until the scan tool indicates the diagnostic Ran.
Does the scan tool indicate the diagnostic Passed?

--

Go to Step 21

Go to Step 2

21

Does the scan tool display any additional undiagnosed DTCs?

--

Go to the applicable DTC table

System OK

Knock Sensor (KS) Replacement

aution

Before servicing any electrical component, the ignition key must be in the OFF or LOCK position and all electrical loads must be OFF, unless instructed otherwise in these procedures. If a tool or equipment could easily come in contact with a live exposed electrical terminal, also disconnect the negative battery cable. Failure to follow these precautions may cause personal injury and/or damage to the vehicle or its components.

Disconnect the negative battery cable.

Object Number: 302854 Size: SH
Click here for detailed picture of above image.
Disconnect the spark plug wires and ignition coil wire from the distributor.

Object Number: 302829 Size: SH
Click here for detailed picture of above image.
Disconnect the CMP sensor harness connector from the distributor.

Object Number: 157984 Size: SH
Click here for detailed picture of above image.
Remove the distributor cap screws.

Object Number: 157986 Size: SH
Click here for detailed picture of above image.
Remove the distributor cap.

Object Number: 334555 Size: SH
Click here for detailed picture of above image.

Important

A DTC P1345 will set if the rotor is not reinstalled in the exact position the rotor was in prior to removal.

Observe the alignment of the rotor in relation to the distributor base (1).

Object Number: 310293 Size: SH
Click here for detailed picture of above image.
Remove the distributor mounting bolt.

Object Number: 310298 Size: SH
Click here for detailed picture of above image.
Remove the distributor assembly.
Discard the distributor gasket.

Object Number: 288465 Size: SH
Click here for detailed picture of above image.
Disconnect the fuel pump and engine oil pressure sensor harness connector.

Object Number: 311702 Size: SH
Click here for detailed picture of above image.
Remove the fuel pump and engine oil pressure sender with a J 35748 Oil Pressure Sending Unit Socket.

Object Number: 288464 Size: SH
Click here for detailed picture of above image.
Remove the knock sensor harness connector.

Object Number: 311958 Size: SH
Click here for detailed picture of above image.
Remove the knock sensor.
Installation Procedure

Tools Required
J 35748 Oil Pressure Sending Unit Socket

Object Number: 311958 Size: SH
Click here for detailed picture of above image.

Notice

Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage.

Install the knock sensor.
Tighten
Tighten the sensor to 20 N·m (15 lb ft)

Object Number: 288464 Size: SH
Click here for detailed picture of above image.
Connect the knock sensor harness connector.

Object Number: 311702 Size: SH
Click here for detailed picture of above image.
Install the fuel pump and engine oil pressure sender with a J 35748 Oil Pressure Sending Unit Socket.
Tighten
Tighten the sender to 30 N·m (22 lb ft)

Object Number: 288465 Size: SH
Click here for detailed picture of above image.
Connect the fuel pump and engine oil pressure sensor harness connector.

Object Number: 334555 Size: SH
Click here for detailed picture of above image.

Important

The proper CKP/CMP correlation will be lost if the rotor is not reinstalled in the same exact position. A DTC P1345 will result from improper distributor shaft alignment.

Align the rotor in its original position in relation to the distributor base (1).

Object Number: 310298 Size: SH
Click here for detailed picture of above image.
Install the distributor assembly using a new distributor gasket.

Object Number: 310293 Size: SH
Click here for detailed picture of above image.
Install the distributor mounting bolt.
Tighten
Tighten the bolt to 25 N·m (18 lb ft)

Object Number: 157986 Size: SH
Click here for detailed picture of above image.
Install the distributor cap.

Object Number: 157984 Size: SH
Click here for detailed picture of above image.

Important

Do not use the old screws for the cap, CMP sensor, and rotor. Use replacement screws that have been coated with a thread locking compound. Precoated replacement cap and CMP sensor screws can be acquired using GM P/N 10475922 (pkg of 10 screws). Precoated replacement rotor screws can be acquired using GM P/N 10475924 (pkg of 10 screws).

Install new distributor cap screws.
Tighten
Tighten the screws to 2.4 N·m (21 lb in)

Object Number: 302829 Size: SH
Click here for detailed picture of above image.
Connect the CMP sensor harness connector.

Object Number: 302854 Size: SH
Click here for detailed picture of above image.
Connect the spark plug wires and the ignition coil wire.
Connect the negative battery cable.

Weitere Bilder

Zitat von DEVIL963

- schlicht das Kabel ab ist

Nein, das kann es nicht sein.
Dann würde ja auch keine produzierte Spannung ans Modul geliefert .....
Das aber ist die Fehlermeldung.

Zitat von DEVIL963

Wenn es das ist was ich vermute

und das wäre was?

Ich denke, da bist Du leider auf dem Holzweg.

Erstens ist Gas sehr viel klopffester als Benzin (deutlich höhere Oktanzahl), verursacht also kein Klopfen beim Starten,
zweitens startet der nicht mit Frühzündung und
drittens kommt der Fehler erst, wenn das KLopfen länger als 5 Sekunden am Stück festgestellt wird. --> nach 1-2 Sekunden wäre aber "Restgas" schon längst verbrannt.

Ach ja, mal als Hinweis: Klopfregeleung funktioniert zylinderselektiv und hat eine Regelgeschwindigkeit, die deutlich schneller ist als das doppelte der möglichen Motordrehzahl.

jetzt muß man auch dazu schreiben, das die Anlage sagen wir mal ein Versuch ist,
da ich das bei dem Motor so nie gemacht habe.
Dieser Motor hat nur eine Elektronisch angesteuerte Benzindüse, dessen Ansteuerung eine Sequentielle Anlage nicht verarbeiten kann.
Die Regelung der Spider Injektoren findet da über den Drück statt.

Weswegen wir uns dann für die Lambda geregelte Venturi von OMVL entschieden haben.

Das komische mal wieder, ich war mit Thomas auf der Autobahn und habe den schön nach Lambda mit viel Luft nach oben und unten Eingestellt.
Der lief Top und ohne Fehler.

Was Thomas prüfen sollte:
Verteilerkappe
Verteilerläufer
Zündkabel
Stecker
Zündkerzen

Gas hat einen viel höheren Zündwiderstand als Benzin, wenn hier z.b. eine Kerze nicht mehr gut ist, gibts Fehlzündungen und Klopfen.
Im Benzin passiert dies aber noch sehr lange nicht.

Wenn die Zündanlage ok ist, kann man den Verteiler auf 5-8 Grad Früh stellen, dann sollte das weg sein.

nein habe ich nicht so aufgefasst, ich habe es nur zum allgemeinen Verständnis dazu geschrieben.

Ich fahre meine immer mit AC Delco Standart und schmeiß die früher raus,
auch den Elektroden Abstand lasse ich original.

Thomas, wegen der Kerzen wsürde ich mir keine so grossen Gedanken machen, ich fahre meine Zündkerzen ausschließlich auf Gas 100000 km, und wechsel die, weil ich mir dann einfach ein besseres Gewissen einrede.
Es treten keine Störungen auf, wo ich allerdings einen höheren Abbrannt bemerke, ist die Verteilerkappe und der Finger.

Was ist denn das für'n Bläser?? warum hat der noch keine MPI?

Gregor, der Blazer hat einen Vortec der aller ersten Generation, der hat schon Vorteckköpfe und alles, aber noch keine sequenzielle Einspritzung, die kam erst 96 zum Einbau.
Der hat eine sehr weiterentwickelte "TBI" drauf, aber nicht mehr im klassischen Sinne, es hat auch einen G20 noch mit diesem Motor gegen´ben, der hatte damals sogar Euro4 bekommen.
Wie das gegagen ist weiß ich nicht, jedenfalls stand das im Brief. Und der G20 war ein 93er Baujahr.