What do these sensor readings mean?
02-27-2003, 09:46 PM
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What do these sensor readings mean? Bank one sensor one low voltage and knock sensor. Got a check engine light plugged in OBDII scanner and this is what read out. I had this reading right before cam install. So i switched the o2 sensors and erased the codes. Well I just got the cam installed and drove it for the first time tonight and those are the readings I got. What do you think the problem could be and any solutions. Thanks Jessie
02-27-2003, 10:26 PM
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Re: What do these sensor readings mean? HOW DOES THE CAR RUN? DOES IT IDLE ALRIGHT? INJECTORS PLUGGED IN? INJECTORS WORKING PROPERLY? ARE THEY SUPER DIRTY OR CLOGGED? TELLS ME YOU ARE SUPER LEAN ON BANK 1.
02-27-2003, 10:26 PM
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Re: What do these sensor readings mean? Jessie,
What was the exact DTC code for the knock sensor?
Tim
<small>[ February 27, 2003, 10:39 PM: Message edited by: Tim Sloper ]</small>
What was the exact DTC code for the knock sensor?
Tim
<small>[ February 27, 2003, 10:39 PM: Message edited by: Tim Sloper ]</small>
02-27-2003, 10:44 PM
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Re: What do these sensor readings mean? Tim,
I dont know what the exact code was for the knock sensor. But i will run the car tomorrow and see if it happens agian if it does I will post the code. Still planning on trying to get up there for tuning as soon as I get a chance. Cam install went perfect, car runs fine and has no problems idling. Thanks Jessie
I dont know what the exact code was for the knock sensor. But i will run the car tomorrow and see if it happens agian if it does I will post the code. Still planning on trying to get up there for tuning as soon as I get a chance. Cam install went perfect, car runs fine and has no problems idling. Thanks Jessie
02-28-2003, 01:29 PM
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Re: What do these sensor readings mean? Do you have an aftermarket MAF or TB?
B1S1 low voltage means it's running lean, therefore probably causing knock from being too lean. Your knock code also probably came from the driver's side then too.
When this SES light came on, were you at WOT (or near to it)?
B1S1 low voltage means it's running lean, therefore probably causing knock from being too lean. Your knock code also probably came from the driver's side then too.
When this SES light came on, were you at WOT (or near to it)?
02-28-2003, 02:48 PM
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Re: What do these sensor readings mean? No when the light comes on I'm usually under 3000 normal driving through town. Just read it again and the code was P0327 said knock sensor one low voltage, bank one sensor one low voltage.
02-28-2003, 04:41 PM
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Re: What do these sensor readings mean? Here ya go for a 99 Camaro.
</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">DTC P0327 Knock Sensor (KS) 1 Circuit
Circuit Description
The Knock Sensor (KS) system detects engine pre-detonation. The PCM retards the spark timing based on the signals from the knock sensors. The knock sensors produce an AC voltage when specific frequencies are detected. The knock sensor voltages are an input to the PCM. The amount of AC voltage produced is proportional to the intensity of the knock.
An operating engine produces a normal amount of engine mechanical vibration (noise). The knock sensors produce an AC voltage signal from this noise. When an engine operates, the PCM learns the minimum and maximum frequency of the noise the engine produces. When the PCM determines that this frequency is less than or greater than the expected amount, a knock sensor DTC will set.
Conditions for Running the DTC
- The engine speed is between 1,650 RPM and 3,000 RPM.
- The MAP is greater than 49 kPa.
- The engine coolant temperature is greater than 60°C (135°F).
- The throttle angle is greater than 0.5%.
- The engine run time is greater than 20 seconds.
Conditions for Setting the DTC
The PCM determines that this frequency is less than or greater than the expected amount for less than 3 seconds.
Action Taken When the DTC Sets
- The PCM illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
- The PCM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the PCM stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the PCM records the operating conditions at the time of the failure. The PCM writes the conditions to the Freeze Frame and updates the Failure Records.
Conditions for Clearing the MIL/DTC
- The PCM turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A last test failed, or current DTC, clears when the diagnostic runs and does not fail.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Use a scan tool in order to clear the MIL and the DTC.
Diagnostic Aids
Important
- Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM connector gaskets when diagnosing/replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the PCM.
- For any test that requires probing the PCM or component harness connectors, use the Connector Test Adapter Kit J 35616-A . Using this kit prevents any damage to the harness connector terminals. Refer to Using Connector Test Adapters in Wiring Systems for procedures.
- Inspect the knock sensor for proper installation. A knock sensor that is loose or over torqued may cause the DTC P0327 to set.
- Using the Freeze Frame and/or Failure Records data may aid in locating an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can also help determine how many ignition cycles the diagnostic reported a pass and/or a fail. Operate the vehicle within the same freeze frame conditions (RPM, load, vehicle speed, temperature etc.) that you observed. This will isolate when the DTC failed.
- For an intermittent, refer to Symptoms .
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2) This verifies the malfunction is present. The scan tool will display DTC Ran=Yes and Pass=Int if the failure is intermittent. This indicates the diagnostic passed this ignition cycle and failed this ignition cycle. At this point the resistance of the knock sensors should be verified to be in the correct range. If the knock sensor resistances are correct, inspect the KS system wiring connections. When testing the KS system connections, start at the KS system jumper harness connector located behind the intake manifold. Then inspect the connections at the PCM. Refer to the wiring schematic for the correct connector and terminal. Then inspect the connections at the appropriate knock sensor. Failure Records data does not include the parameter KS Activity, however other parameters may aid in locating the conditions under which an intermittent occurred.
3) This test isolates the Knock Sensor from the rest of the circuit.
4) Tap on the engine block near the appropriate knock sensor. Do not tap on plastic engine components.
Step 1
Did you perform the Powertrain On-Board Diagnostic (OBD) System Check?
--
Yes: Go to Step 2
No: Go to Powertrain On Board Diagnostic (OBD) System Check
Step 2
Important
If an engine knock can be heard, repair the engine mechanical condition before proceeding with this diagnostic. Refer to Engine Noise Diagnosis in Engine Mechanical.
1) Turn ON the ignition leaving the engine OFF.
2) Review the Freeze Frame and/or Failure Records data for this DTC and observe the parameters.
3) Turn OFF the ignition for 15 seconds.
4) Start the engine.
5) Operate the vehicle within the conditions required for this diagnostic to run, and as close to the conditions recorded in Freeze Frame and/or Failure Records as possible. Special operating conditions that you need to meet before the PCM will run this diagnostic, where applicable, are listed in Conditions for Running the DTC.
6) Monitor the Diagnostic Trouble Code (DTC) information using a scan tool.
Does the scan tool indicate that this diagnostic failed this ignition?
--
Yes: Go to Step 3
No: Go to Diagnostic Aids
Step 3
1) Disconnect the knock sensor electrical connector located behind the intake manifold.
2) Measure the resistance between the appropriate knock sensor signal circuit (sensor side of harness) and the battery ground using the DMM J 39200 .
3) Set the DMM to the 400K ohm scale.
Is the resistance of the knock sensor within the specified range?
Specified Range = 93-107Kohms
--
Yes: Go to Step 4
No: Go to Step 6
Step 4
1) Connect the DMM between the appropriate knock sensor signal circuit (sensor side of harness) and the engine block.
2) Set the DMM to the AC voltage scale.
Important
Do not tap on plastic engine components.
3) Tap on the engine near the appropriate knock sensor while observing the signal indicated on the DMM.
Is any signal indicated on the DMM while tapping on the engine near the appropriate Knock Sensor?
--
Yes: Go to Step 5
No: Go to Step 7
Step 5
1) Disconnect the PCM connector C1 located on the same side as the manufacturer's logo. Refer to PCM Replacement/Programming .
2) Test the KS signal circuit between the PCM and the knock sensor connector for the following:
- An open
- A short to voltage
- A short to ground
3) If you find a condition repair the condition as necessary.
Did you find and correct the condition?
--
Yes: Go to Step 10
No: Go to Step 8
Step 6
1) Remove the intake manifold. Refer to Intake Manifold Replacement .
2) Test for an open or a short to ground in the signal circuit between the knock sensor jumper harness connector, located at the back of the intake manifold, and the knock sensor connector.
Did you find and correct the condition?
--
Yes: Go to Step 10
No: Go to Step 7
Step 7
Replace the appropriate Knock Sensor. Refer to Knock Sensor (KS) Replacement .
Is the action complete?
--
Yes: Go to Step 10
--
Step 8
1) Inspect for a poor connection at the PCM. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.
2) If you find a poor connection repair as necessary. Refer to Repairing Connector Terminals in Wiring Systems.
Did you find and repair the condition?
--
Yes: Go to Step 10
No: Go to Step 9
Step 9
Important:
Program the replacement PCM. Refer to PCM Replacement/Programming .
Replace the PCM.
Is the action complete?
--
Yes: Go to Step 10
--
Step 10
1) Select the Diagnostic Trouble Code (DTC) option and the Clear DTC Information option using the scan tool.
2) Idle the engine at the normal operating temperature.
3) Select the Diagnostic Trouble Code (DTC) option and the Specific DTC option, then enter the DTC number using the scan tool.
4) Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text, if applicable.
Does the scan tool indicate that this test ran and passed?
--
Yes: Go to Step 11
No: Go to Step 2
Step 11
Select the Capture Info option and the Review Info option using the scan tool.
Does the scan tool display any DTCs that you have not diagnosed?
--
Yes: Go to the applicable DTC table
No: System OK</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">
</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">DTC P0327 Knock Sensor (KS) 1 Circuit
Circuit Description
The Knock Sensor (KS) system detects engine pre-detonation. The PCM retards the spark timing based on the signals from the knock sensors. The knock sensors produce an AC voltage when specific frequencies are detected. The knock sensor voltages are an input to the PCM. The amount of AC voltage produced is proportional to the intensity of the knock.
An operating engine produces a normal amount of engine mechanical vibration (noise). The knock sensors produce an AC voltage signal from this noise. When an engine operates, the PCM learns the minimum and maximum frequency of the noise the engine produces. When the PCM determines that this frequency is less than or greater than the expected amount, a knock sensor DTC will set.
Conditions for Running the DTC
- The engine speed is between 1,650 RPM and 3,000 RPM.
- The MAP is greater than 49 kPa.
- The engine coolant temperature is greater than 60°C (135°F).
- The throttle angle is greater than 0.5%.
- The engine run time is greater than 20 seconds.
Conditions for Setting the DTC
The PCM determines that this frequency is less than or greater than the expected amount for less than 3 seconds.
Action Taken When the DTC Sets
- The PCM illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
- The PCM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the PCM stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the PCM records the operating conditions at the time of the failure. The PCM writes the conditions to the Freeze Frame and updates the Failure Records.
Conditions for Clearing the MIL/DTC
- The PCM turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A last test failed, or current DTC, clears when the diagnostic runs and does not fail.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Use a scan tool in order to clear the MIL and the DTC.
Diagnostic Aids
Important
- Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM connector gaskets when diagnosing/replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the PCM.
- For any test that requires probing the PCM or component harness connectors, use the Connector Test Adapter Kit J 35616-A . Using this kit prevents any damage to the harness connector terminals. Refer to Using Connector Test Adapters in Wiring Systems for procedures.
- Inspect the knock sensor for proper installation. A knock sensor that is loose or over torqued may cause the DTC P0327 to set.
- Using the Freeze Frame and/or Failure Records data may aid in locating an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can also help determine how many ignition cycles the diagnostic reported a pass and/or a fail. Operate the vehicle within the same freeze frame conditions (RPM, load, vehicle speed, temperature etc.) that you observed. This will isolate when the DTC failed.
- For an intermittent, refer to Symptoms .
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2) This verifies the malfunction is present. The scan tool will display DTC Ran=Yes and Pass=Int if the failure is intermittent. This indicates the diagnostic passed this ignition cycle and failed this ignition cycle. At this point the resistance of the knock sensors should be verified to be in the correct range. If the knock sensor resistances are correct, inspect the KS system wiring connections. When testing the KS system connections, start at the KS system jumper harness connector located behind the intake manifold. Then inspect the connections at the PCM. Refer to the wiring schematic for the correct connector and terminal. Then inspect the connections at the appropriate knock sensor. Failure Records data does not include the parameter KS Activity, however other parameters may aid in locating the conditions under which an intermittent occurred.
3) This test isolates the Knock Sensor from the rest of the circuit.
4) Tap on the engine block near the appropriate knock sensor. Do not tap on plastic engine components.
Step 1
Did you perform the Powertrain On-Board Diagnostic (OBD) System Check?
--
Yes: Go to Step 2
No: Go to Powertrain On Board Diagnostic (OBD) System Check
Step 2
Important
If an engine knock can be heard, repair the engine mechanical condition before proceeding with this diagnostic. Refer to Engine Noise Diagnosis in Engine Mechanical.
1) Turn ON the ignition leaving the engine OFF.
2) Review the Freeze Frame and/or Failure Records data for this DTC and observe the parameters.
3) Turn OFF the ignition for 15 seconds.
4) Start the engine.
5) Operate the vehicle within the conditions required for this diagnostic to run, and as close to the conditions recorded in Freeze Frame and/or Failure Records as possible. Special operating conditions that you need to meet before the PCM will run this diagnostic, where applicable, are listed in Conditions for Running the DTC.
6) Monitor the Diagnostic Trouble Code (DTC) information using a scan tool.
Does the scan tool indicate that this diagnostic failed this ignition?
--
Yes: Go to Step 3
No: Go to Diagnostic Aids
Step 3
1) Disconnect the knock sensor electrical connector located behind the intake manifold.
2) Measure the resistance between the appropriate knock sensor signal circuit (sensor side of harness) and the battery ground using the DMM J 39200 .
3) Set the DMM to the 400K ohm scale.
Is the resistance of the knock sensor within the specified range?
Specified Range = 93-107Kohms
--
Yes: Go to Step 4
No: Go to Step 6
Step 4
1) Connect the DMM between the appropriate knock sensor signal circuit (sensor side of harness) and the engine block.
2) Set the DMM to the AC voltage scale.
Important
Do not tap on plastic engine components.
3) Tap on the engine near the appropriate knock sensor while observing the signal indicated on the DMM.
Is any signal indicated on the DMM while tapping on the engine near the appropriate Knock Sensor?
--
Yes: Go to Step 5
No: Go to Step 7
Step 5
1) Disconnect the PCM connector C1 located on the same side as the manufacturer's logo. Refer to PCM Replacement/Programming .
2) Test the KS signal circuit between the PCM and the knock sensor connector for the following:
- An open
- A short to voltage
- A short to ground
3) If you find a condition repair the condition as necessary.
Did you find and correct the condition?
--
Yes: Go to Step 10
No: Go to Step 8
Step 6
1) Remove the intake manifold. Refer to Intake Manifold Replacement .
2) Test for an open or a short to ground in the signal circuit between the knock sensor jumper harness connector, located at the back of the intake manifold, and the knock sensor connector.
Did you find and correct the condition?
--
Yes: Go to Step 10
No: Go to Step 7
Step 7
Replace the appropriate Knock Sensor. Refer to Knock Sensor (KS) Replacement .
Is the action complete?
--
Yes: Go to Step 10
--
Step 8
1) Inspect for a poor connection at the PCM. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.
2) If you find a poor connection repair as necessary. Refer to Repairing Connector Terminals in Wiring Systems.
Did you find and repair the condition?
--
Yes: Go to Step 10
No: Go to Step 9
Step 9
Important:
Program the replacement PCM. Refer to PCM Replacement/Programming .
Replace the PCM.
Is the action complete?
--
Yes: Go to Step 10
--
Step 10
1) Select the Diagnostic Trouble Code (DTC) option and the Clear DTC Information option using the scan tool.
2) Idle the engine at the normal operating temperature.
3) Select the Diagnostic Trouble Code (DTC) option and the Specific DTC option, then enter the DTC number using the scan tool.
4) Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text, if applicable.
Does the scan tool indicate that this test ran and passed?
--
Yes: Go to Step 11
No: Go to Step 2
Step 11
Select the Capture Info option and the Review Info option using the scan tool.
Does the scan tool display any DTCs that you have not diagnosed?
--
Yes: Go to the applicable DTC table
No: System OK</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">
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03-01-2003, 02:46 PM
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Re: What do these sensor readings mean? HOLY **** <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> an answer like that is what makes this board awesome!!! yo the man CMNTMXR57
03-02-2003, 02:14 PM
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Re: What do these sensor readings mean? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by 2002snortbird:
<strong> HOLY **** <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> an answer like that is what makes this board awesome!!! yo the man CMNTMXR57 </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">No Problem, you guys get the codes, I gotz mad access to GM's SI2000 system. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
<strong> HOLY **** <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> an answer like that is what makes this board awesome!!! yo the man CMNTMXR57 </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">No Problem, you guys get the codes, I gotz mad access to GM's SI2000 system. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
