Question about 1990 Volvo 740

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Fault test shows no knock enrichment signal from ignition system

1990 740 auto, estate.

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  • bernard_bart Feb 14, 2009

    on terminal 2 the only fault code is 3-1-2 , no faults on terminal 6. will check again in the morning & thanks for the response.

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Is that the only code? Make sure you check terminal #2 and #6 when checking codes. I don't think the code for knock enrichment should cause the light to come on.

Posted on Feb 13, 2009

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Valves clacking changed the oil pump and lifters but still clacking what could be the problem


Do you know what a knock sensor is ?
The knock sensor (KS) system enables the control module to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The control module uses the KS system to test for abnormal engine noise that may indicate detonation, also known as spark knock.
If the control module has determined that knock is present, it will retard the ignition timing to attempt to eliminate the knock. The control module will always try to work back to a zero compensation level, or no spark retard. An abnormal KS signal will stay outside of the noise channel or will not be present. KS diagnostics are calibrated to detect faults with the KS circuitry inside the control module, the KS wiring, or the KS voltage output. Some diagnostics are also calibrated to detect constant noise from an outside influence such as a loose/damaged component or excessive engine mechanical noise
Do you know what spark knock is or pinging ? EGR valve problem ! Is your oil pressure low ? do you have a gauge or a oil light ! If it where an oil pump problem the light would be lit ! Is your check engine light lit ? How many miles on the vehicle ? Timing chain an gears , jumped time !

Aug 22, 2015 | 2006 Pontiac Torrent

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41 thrt val sol


P0041 Oxygen Sensor Signals Swapped Bank 1 Sensor 2/Bank 2 Sensor 2
looks like your wires and melted together or a rodent has chewed them

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1 Answer

While driving the car runs fine, but when stoping at a stop it idles rough and try to cut off. pulled code gave code p0325. I changed the knock sensor but still gets code p0325, and car still misses at...


Hi Thomas,
We have a couple different issues here.
First, your Maxima is either NOT a 1995 model, or it is a very late 1995 model that "thinks" it's a 1996. The reason I say this is because a 1995 model Maxima is NOT OBD compatible and is not capable of outputting "P-codes" to a generic OBD scanner.
Those Nissans that were claimed to be OBD compatible in the late 1995 model year only output certain codes. To find out the rest of the story, you still need a scanner that has software capable of accessing the engine computer through the Nissan-2 connector (usually in the fuse block area).
Then you need to understand about Diagnostic Trouble Code (DTC) P0325.
This code does not necessarily mean that you need a new knock sensor. I think you will be a little less confused if you know the facts. What you need to know about ALL fault codes is that they NEVER tell you what parts to replace. Fault codes only tell you that the computer has a problem with one of the many circuits and systems that it monitors. The fault code will tell you which system is failing or which circuit is failing. They DO NOT tell you what is wrong with the circuit or system that it is reporting. The person diagnosing the vehicle is supposed to figure that one out.
Most people think that "diagnostics" means plug in the "magic box" and replace everything the computer tells you to replace. I WISH it was that easy!
Now that you know all of this, we can examine the code itself. What causes this code to set? ...I'm glad you asked. The computer controls the ignition timing in your car. The trick is to advance the timing as far as possible (for more power and efficiency) while not advancing it too far, which will cause pre-detonation (also known as "ignition ping"). Pre-detonation can cause serious engine damage, including burning holes through a piston.
Here is where the knock sensor comes in.
SCENARIO 1: The computer advances the ignition until the knock sensor "hears" an ignition ping. When this happens, the knock sensor sends a signal to the PCM to let it know that the engine is "knocking". So the computer responds by retarding the timing a little to stop the knock. When the knock stops, the knock sensor will stop sending a knock signal to the computer.
DTC P0325 sets when the computer has ******** the ignition timing as far as it possibly can and the knock sensor is STILL sending a knock signal.
SCENARIO 2: The computer also tests the knock sensor by deliberately advancing the timing too far for a few seconds to see if it gets a signal from the knock sensor.
So, P0325 can also set if there is NO signal from the knock sensor when the computer is EXPECTING a signal.
For scenario 1, the cause is usually a mechanical knock in the engine. Loose timing belts, worn/loose timing chains worn distributor shafts, bad pulley bearings, etc. The knock sensor does not know the difference between a knock caused by pre-detonation and a knock caused by a loose valve lifter (or other mechanical reason). The knock does not go away when the timing is ******** because the knock is not CAUSED by timing....code P0325 sets.
For scenario 2, the cause is usually either the knock sensor itself or a problem with the wire between the knock sensor and the computer or the knock sensor is not grounded properly. These things will cause the knock sensor to not be able to get a message through to the computer....code P0325 sets.
Now, the misfire at idle is a whole other issue. The computer will default to base ignition timing settings if there is a knock sensor fault. You may notice a little loss of performance, particularly during heavy acceleration, but there is NO WAY that your knock sensor is the CAUSE of ANY misfire - especially not at idle. However, it is VERY possible that whatever is causing the misfire could also be the cause of the knock sensor code.
Basically what I am saying here is that you need to put the knock sensor problem "on the back burner" until you find out what is causing your misfire. Unfortunately, misfires can be cause by a LOT of different things ranging from a bad spark plug to a cracked cylinder head or worn-out piston rings. The misfire simply has to be diagnosed using the proper procedures to avoid replacing a bunch of things that will not fix the problem.
With all that said, WHEW! I hope you got through all that!
The older Nissans are notorious for the distributor shaft bushing going bad and causing a loud "rattling" noise. The movement of the shaft can cause a cylinder misfire, and the rattling can cause a knock sensor code to set. I have fixed many of the Nissan V-6 engines with this same problem by replacing the distributor. This is the FIRST place I would look. If your distributor is not rattling, try revving the motor just a little and see if it rattles. If it does, replace it. If it does not, let me know and we will look elsewhere for the cause of your problem.
-Dave (dttech)

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1 Answer

Is there a list for computer codes for 1980-1990's Chrysler Le Baron


Yes here is that list.
Chrysler products COMMON CODES OBD1 (vehicles made before 1995)
Part 1: Chrysler Domestic vehicles
CODES/Meaning
88 display used for start or test
11 camshaft signal or ignition signal, no reference signal during cranking
12 memory to controller has been cleared within 50-100 engine starts
13 map sensor not detecting any change during test
14 map voltage too high or too low
15 vehicle speed sensor, no signal detected
16 knock sensor circuit. open or short detected
17 low engine temperature, possible thermostat fault
21 oxygen sensor signal, neither rich or lean detected
22 coolant sensor voltage low
23 air charge voltage high/low detected
24 throttle positioner sensor voltage high/low
25 automatic idle speed motor driver circuit, short or open detected
26 injectors 1,2,3 peak current not reached
27 injector control circuit does not respond to control signal
31 purge solenoid circuit, open or short detected
32 egr solenoid circuit, open or short detected
33 a/c clutch relay circuit, open or short detected
34 speed control servo solenoid, open or short detected
35 radiator fan control relay circuit, open or short detected
36 wastegate solenoid, open or short detected
37 part throttle unlock(PTU) circuit, open or short detected
41 charging system circuit not responding to control signal
42 fuel pump or auto shutdown (ASD) relay voltage sensed at controller
43 ignition control circuit not responding
44 battery temperature voltage circuit problem
45 turbo boost limit exceeded-map sensor detects overboost
46 battery voltage too high
47 battery voltage too low
51 air/fuel at limit
52 logic module fault
53 internal controller failure
54 camshaft reference circuit not detected
55 end of message
61 baro read solenoid, open or short detected
62 emr mileage not stored
63 eeprom write denied
64 flex fuel sensor signal out of range
65 manifold tuning valve, open or short detected
66 no ccd messages
76 ballast bypass relay, open or short detected
77 speed control relay, open or short detected

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1 Answer

WHERE IS THE KNOCK SENSOR ON A 2006 CHEVY COBALT TO REPLACE IT.


Not related to the O2 sensor. Located on the front of the engine just above the starter KNOCK SENSOR (KS) SYSTEM DESCRIPTION

PURPOSE
The knock sensor (KS) system enables the engine control module (ECM) to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The ECM uses the KS system to test for abnormal engine noise that may indicate detonation, also known as spark knock.

SENSOR DESCRIPTION
The knock sensor (KS) system uses a flat response 2-wire sensor. The sensor uses piezo-electric crystal technology that produces an AC voltage signal of varying amplitude and frequency based on the engine vibration, or noise, level. The amplitude and frequency are dependant upon the level of knock that the KS detects. The engine control module (ECM) receives the KS signal through a signal circuit. The KS ground is supplied by the ECM through a low reference circuit.

The ECM learns a minimum noise level, or background noise, at idle from the KS and uses calibrated values for the rest of the RPM range. The ECM uses the minimum noise level to calculate a noise channel. A normal KS signal will ride within the noise channel. As engine speed and load change, the noise channel upper and lower parameters will change to accommodate the KS signal, keeping the signal within the channel. In order to determine which cylinders are knocking, the ECM only uses KS signal information when each cylinder is near top dead center (TDC) of the firing stroke. If knock is present, the signal will range outside of the noise channel.

If the ECM has determined that knock is present, it will ****** the ignition timing to attempt to eliminate the knock. The ECM will always try to work back to a zero compensation level, or no spark ******. An abnormal KS signal will stay outside of the noise channel or will not be present. KS diagnostics are calibrated to detect faults with the KS circuitry inside the ECM, the KS wiring, the KS voltage output, or constant noise from an outside influence such as a loose/damaged component or excessive engine mechanical noise.

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1 Answer

I need a honda car code , i can't turn on my radio


service manual.
Code Description Possible Cause
0 ECU / ECU signal No signal to ECU
1 Oxygen sensor circuit Oxygen sensor or circuit, ECU
2 Oxygen sensor circuit Oxygen sensor or circuit, ECU
3 MAP sensor circuit Map sensor circuit
4 CKP sensor / engine speed (RPM) Crank angle sensor or circuit, ECU
sensor
5 MAP sensor circuit MAP sensor or circuit, mechanical
problem
6 ECT sensor circuit ECT sensor or circuit, automatic
transaxle control unit
7 TPS / Angle Sensor TPS sensor or circuit, automatic
transaxle control unit
8 CKP sensor / engine speed (RPM) Crank angle sensor or circuit, ECU
sensor
9 CMP sensor CMP sensor or circuit
10 IAT sensor IAT sensor or circuit
11 Idle Mixture Adjuster Sensor Idle mixture adjuster sensor or
circuit
12 EGR system fault No EGR action, faulty EGR valve
13 BARO sensor circuit BARO sensor or circuit
14 Idle Air Control valve circuit / ECU Open or shorted out ignition signal
circuit / No signal to ECU
15 Ignition Output signal Open or shorted ignition output
signal circuit
16 Fuel Injector Circuit Open or shorted fuel injector
circuit
17 VSS circuit VSS sensor or circuit
18 Ignition Timing Adjuster Open or shorted signal circuit
19 A/T Lock-up control solenoid Open or shorted signal circuit,
Lock-up control solenoid lock-up solenoid
20 Electrical Load Detector / Sensor Electrical load detector or circuit
Honda/Acura
Fault Code Definitions (21 - 59)
Chapter 3 22
Code Description Possible Cause
21 Spool Solenoid Valve Open or shorted signal circuit,
spool solenoid valve
22 Valve Timing Electronic Oil Open or shorted signal circuit,
pressure switch valve timing oil pressure switch
23 Knock sensor circuit Knock sensor or circuit
30 AT / ECU communication signal A AT control unit, ECU
31 AT / ECU communication signal B AT control unit, ECU
35 Traction control / ECU / signal Traction control module, ECU
36 Traction control / ECU / signal Traction control module, ECU
41 Oxygen sensor heater - left side Oxygen sensor / heater or circuit
42 Oxygen sensor heater - right side Oxygen sensor / heater or circuit
43 Fuel Supply system - left side Oxygen sensor or circuit, fuel
system
44 Fuel Supply system - right side Oxygen sensor or circuit, fuel
system
45 Fuel metering - left side Injector control circuit, incorrect
fuel metering
46 Fuel metering - right side Injector control circuit, incorrect
fuel metering
48 Heated oxygen sensor Oxygen sensor or circuit
53 Right Knock Sensor Right knock sensor or circuit
54 CKP sensor 2 CKP sensor 2 or circuit
59 CMP sensor 2 CMP sensor 2 or circuit

Dec 28, 2010 | 1994 Honda Accord

1 Answer

The engine management light keeps going on and off in my Nissan Primera Estate. The car chudders when going through the gears and I've noticed the Revs per minute gage flickering all the time, mostly...


you have a fuel enrichment problem and will ruin your catalytic converter very soon. get diagnostic test 7 find fault codes so you know what's causing rich fuel mixture.

Dec 12, 2009 | 1997 Nissan Maxima

2 Answers

Checking the fault codes


Yes.  Next to the ash tray there is a black slide off plate that reveals the OBD I plug.  {1996 and newer can be read with an OBD II reader (read for free at Advance auto or Auto Zone)}  Once you reveal this plug on the 1995, you can plug in a single jumper wire (or even a paper clip) in the #4 and #15 pin hole.  There are two rows of pin holes, count from the upper right to the #4, then on to #15 (which will be the second to last pin hole).  Turn the ignition switch on (motor not running), insert the jumper wire for about 3 to 5 seconds, then remove the wire.  The ENGINE LIGHT will flash a hold, then the code, which will go something like this, flash, flash, PAUSE, flash, flash, PAUSE, flash, PAUSE, flash, flash, flash, flash.  Then it will repeat the codes if you just sit there and observe it.  The code in my example would be a 2214 code.
Below are some code I found on a website.  I hope this helps.  Now I ask that you take the time to answer someone elses question.  Lets all share.  Good luck, "Peace through power and knowledge"

CODE FAULT
0000 End of fault sequence
1111 Bad ground to Electronic Control Unit (ECU) or ECU failure-check grounds or replace
ECU
1119 Transmission Range - Defective wiring. Check for break or short.
1213 Vehicle Speed Sensor (VSS) - Check transmission speed sender wiring and the wiring of
the instrument cluster
1231 Vehicle Speed Sensor (VSS) (G54) - Check transmission speed sender wiring and the
wiring of the instrument cluster
1232 Throttle Position Actuator - Check defective actuator or wiring for break or short.
2111 Engine speed sender. (RPM)
2112 Ignition reference sender
2113 Hall sender - No speed signal from distributor; check Hall sensor and circuits or the
Air-flow sensor plate is not moving freely; adjust potentiometer or lever.
2114 Hall sender not on reference point or distributor out of position.
2121 Idle switch - check switch & circuit.
2122 Hall sender - Check wiring for break or short.
2123 Full throttle switch; check switch & circuit.
2132 Electronic Control Module (ECM) - No ignition to injection signal.
2141 Knock sensor 1 control at maximum ****** - test compression, change octane, adjust
timing, check knock-sensor wires.
2142 Knock sensor 1 signal - Test sensor, check wiring for break or short.
2143 Knock sensor 2 control at maximum ****** - test compression, change octane, adjust
timing, check knock-sensor wires.
2144 Knock sensor 2 signal; test sensor.
2212 Throttle Potentiometer - Value out of range.
2214 RPM Signal - Idle speed to high or engine over-revved
2221 Vacuum Control - No vacuum to control unit. Check for leaks.
2222 Manifold Vacuum - Check vacuum line and wastegate for leaks.
Pressure sensor - Sensor defective
2223 Altitude Sensor - Check sensor, check wiring for break or short.
2224 Turbo/Manifold pressure - Check turbo control wiring, check for over boost, air leak,
defective wastegate valve, vacuum leak or defective pressure sensor.
2231 Idle-speed stabilizer adjustment limits exceeded; too-fast idle. Adjust throttle for full
closing, check for vacuum leak, check ignition timing.
Or
Air Mass Sensor - Check sensor and wiring.
2232 Air mass/flow sensor - No signal. Check wiring for break or short.
2233 Air mass/flow sensor reference voltage open or short circuit
2234 ECM Supply voltage low.
2242 CO-potentiometer voltage low
2312 Coolant temperature sensor - Check wiring, check resistance.
2314 Transmission to Engine control module circuit. - Check wires for breaks or shorts.
2322 Intake Air Temperature Sensor - Check sensor and wiring.
2323 Mass Airflow Sensor - Check sensor and wiring for breaks.
2324 Mass Airflow Sensor - Check sensor and wiring for breaks or shorts to B+ or ground or
check for air leak.
2331 Oxygen Sensor Control - Out of range. - Check ignition, air intake for leaks and injectors.
2332 Oxygen Sensor - Bank 2 - Check wiring for breaks or shorts.
2341 Oxygen sensor (O2) at control limit; check CO, lambda-sensor wire, lambda-sensor
control, start valve, evaporative system and check for vacuum leaks.
2342 Oxygen Sensor Control - no signal - Check wiring, sensor.
2343 Rich limit; the pressure regulator has exceeded +10 mA for more than 5 minutes,
closed-loop; check for vacuum leaks.
2344 Lean limit; the pressure actuator has exceeded -5mA for more than 5 minutes, closed
loop; check idle.
2411 EGR System Malfunction
2412 Intake Air Temperature Sensor - Check sensor and wiring for breaks or shorts
2413 Mixture Control - Running rich
Fuel pressure too low
3424 Malfunction Indicator Lamp (MIL) failure - Check lamp and wiring.
4311 Secondary Air Injection Pump Relay - Check relay and wiring.
4312 EGR Frequency Valve
4313 Secondary Air Injection Solenoid Valve - Check valve and wiring.
4331 EVAP Carbon Canister Solenoid Purge Valve 2
4332 Ignition Circuit Final Stage - Check for break or short to ground or B+ or bad ECM.
4343 EVAP Carbon Canister Solenoid Purge Valve 1
4411 Fuel Injector Cylinder 1 or 1 & 5
4412 Fuel Injector Cylinder 2 or 2 & 7
4413 Fuel Injector Cylinder 3 or 3 & 6
4414 Fuel Injector Cylinder 4 or 4 & 8
4421 Fuel Injector Cylinder 5
4422 Fuel Injector Cylinder 6
4423 Fuel Injector Cylinder 7
4424 Fuel Injector Cylinder 8
4431 Idle Air Control Valve / Idle Stabilizer - Check valve and wiring.
4433 Fuel Pump Relay
4442 Wastegate - Defective frequency valve or wiring.
Boost pressure circuit - Check for short.
4443 EVAP Canister purge valve.
4444 No fault in system.

Oct 17, 2008 | 1995 Volkswagen Jetta

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