CODE 77 and COD 57 engine warning light on and off rarelyCODE

[Xtreme]

Hi Everyone,

I know these questions are asked alot and I have done as much searching through the forum as possible to see if anything could answer my questions but am still unsure.

I have a 2000 GU patrol 3.0, Automatic 260k original motor, Roo systems chip, 3 inch exhaust NADS (except the oil catch can) and am towing a 2700kg van.

I began the trip in March, before leaving I changed the engine oil and filter, transmission oil, both diff oils etc.

I bought the car in January for the purpose of the trip (Round oz)

About 3 weeks ago I had the engine warning light come on, I checked the fuel in the filter and found no water. Had RACQ come out as the light remained on and he took the filter off and drained it upside down, had alot of dirty fuel/gunk come out. Light went out and I continued on my way. 20 mins later and light came on, called RACQ again to read fault code - his computer did not read it. Advised to contact NISSAN.

Drove fine for 3 weeks no light and it recently came on, got fault code read at a mechanics and advised it was probable the injector pump but not certain.
Error code was cleared but came on next day for 20mins.
Got the car read again by injector pump specialist who said they connect to the pump itself to take reading from there.

2 codes
CODE 77 Start of injection control signal improbable
CODE 57 Timing device control steady state deviation

I think the code 57 was from the pump.

The specialist assures me it is the pump but not sure what - could be wires worn and touching, or worn parts mechanically throwing out timing etc.

Quote 4500 for rebuild and install of pump. Had another patrol in there same problem showed me how far he pulled down the motor to get to the pump - alot of work.

I could not find anything on the CODE 57 just wanted to hear any opinions?

After reading on here I got him to attach the clear line to check for any air while I was there - no air.

Could ruin the holiday at 5k. Any help appreciated.

Thanks

[Col.T]

G'day mate.
Not getting far are you?
Suspect it's because finding any info on those codes is next to impossible. Codes SUCK!!!!!.
Only ref. I can find in the Patrol manual is for 057 and that's listed as a code for/under the TB48 engine. It's to do with the 'Heated oxygen sensor2 control circuit'
There's a site on the web 'OBD CODES.COM' which seems to be pretty comprehensive and I'll try to get their info/fixes across to here.

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P0057 HO2S Heater Control Circuit Low B2S2

OBD-II Trouble Code Technical Description

Article by

Dale Toalston
ASE Certified Technician

HO2S Heater Control Circuit Low (Bank 2 Sensor 2)

What does that mean?

This code is a generic powertrain code. It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may be slightly different depending on the model. For Nissan vehicles, the description is just slightly different, it's listed as Heated oxygen sensor (HO2S) 2 Bank 2 - heater voltage low.



Heated Oxygen sensors (HO2S) are inputs used by the PCM (Powertrain Control Module) to determine oxygen content in the exhaust system. Bank 2, sensor 2 refers to the second sensor back on Bank 2. The PCM uses the information gained from the Bank 2,2 HO2S mainly to monitor the efficiency of the catalytic converter. Integral to this sensor is a heater element

The PCM controls this heater to warm up the sensor to operating temperature. This allows the engine to enter closed loop faster and reduces emissions on cold startup. The PCM continuously monitors the heater circuits for abnormal voltages or in some cases, even amperages. Depending on the make of vehicle, the Oxygen sensor heater is controlled one of two ways. One way is that the PCM directly controls the voltage feed to the heater either directly or via a HO2S relay and a ground is supplied from the vehicle's common ground. The other way would be a fused 12 volt Battery feed (B+) that feeds 12 volts to the heater element anytime the ignition is on and the control of the heater is done by a driver in the PCM which controls the ground side of the heater circuit.

Finding out which one you have is important because the PCM activates the heater under various circumstances. If the PCM detects an abnormally low voltage condition on the heater circuit, P0057 may set. Bank 2 is the side of the engine that does not contain cylinder #1.

Symptoms

Symptoms of a P0057 DTC may include:
•Malfunction indicator lamp (MIL) illumination
•There will likely be no other symptoms

Causes

Potential causes of a P0057 trouble code may include:
•Bank 2,2 oxygen sensor heater element has failed
•Physical damage to heated oxygen sensor has occurred
•Control circuit (or voltage feed, depending on system) is shorted to ground
•PCM Oxygen sensor heater driver has failed

Possible Solutions

Do a visual inspection of the Bank 2,2 HO2S and wiring harness. If there is any damage to the sensor or any damage to the wiring, repair/replace as needed. Make sure wiring is routed away from exhaust. If all appears okay, unplug the Bank 2,2 HO2S and verify that there is 12 volts B+ present with the key on engine off, (or ground is present, depending on the system).

Verify the heater control (ground) circuit is intact. If so, remove the o2 sensor and inspect for damage. If you have access to resistance specifications you can use a Ohmmeter to perform a resistance test of the heater element. Infinite resistance indicates an open in the heater. Replace the o2 sensor as necessary.

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P0057 HO2S Heater Control Circuit Low B2S2

OBD-II Trouble Code Technical Description

Article by

Dale Toalston
ASE Certified Technician

HO2S Heater Control Circuit Low (Bank 2 Sensor 2)

What does that mean?

This code is a generic powertrain code. It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may be slightly different depending on the model. For Nissan vehicles, the description is just slightly different, it's listed as Heated oxygen sensor (HO2S) 2 Bank 2 - heater voltage low.



Heated Oxygen sensors (HO2S) are inputs used by the PCM (Powertrain Control Module) to determine oxygen content in the exhaust system. Bank 2, sensor 2 refers to the second sensor back on Bank 2. The PCM uses the information gained from the Bank 2,2 HO2S mainly to monitor the efficiency of the catalytic converter. Integral to this sensor is a heater element

The PCM controls this heater to warm up the sensor to operating temperature. This allows the engine to enter closed loop faster and reduces emissions on cold startup. The PCM continuously monitors the heater circuits for abnormal voltages or in some cases, even amperages. Depending on the make of vehicle, the Oxygen sensor heater is controlled one of two ways. One way is that the PCM directly controls the voltage feed to the heater either directly or via a HO2S relay and a ground is supplied from the vehicle's common ground. The other way would be a fused 12 volt Battery feed (B+) that feeds 12 volts to the heater element anytime the ignition is on and the control of the heater is done by a driver in the PCM which controls the ground side of the heater circuit.

Finding out which one you have is important because the PCM activates the heater under various circumstances. If the PCM detects an abnormally low voltage condition on the heater circuit, P0057 may set. Bank 2 is the side of the engine that does not contain cylinder #1.

Symptoms

Symptoms of a P0057 DTC may include:
•Malfunction indicator lamp (MIL) illumination
•There will likely be no other symptoms

Causes

Potential causes of a P0057 trouble code may include:
•Bank 2,2 oxygen sensor heater element has failed
•Physical damage to heated oxygen sensor has occurred
•Control circuit (or voltage feed, depending on system) is shorted to ground
•PCM Oxygen sensor heater driver has failed

Possible Solutions

Do a visual inspection of the Bank 2,2 HO2S and wiring harness. If there is any damage to the sensor or any damage to the wiring, repair/replace as needed. Make sure wiring is routed away from exhaust. If all appears okay, unplug the Bank 2,2 HO2S and verify that there is 12 volts B+ present with the key on engine off, (or ground is present, depending on the system).

Verify the heater control (ground) circuit is intact. If so, remove the o2 sensor and inspect for damage. If you have access to resistance specifications you can use a Ohmmeter to perform a resistance test of the heater element. Infinite resistance indicates an open in the heater. Replace the o2 sensor as necessary.

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Dunno if this helps. Hope it does but it looks as if you'll need to be more clued up than me to get a fix yourself even though I'll have a go at most things. I must be getting old as well as......
If the man is right and these ARE generic codes, ALL makes/models this should give you an idea.
Best of luck,
Col

[Col.T]

Bloody Hell,
Old as well as....
Let's try again.

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Your OBD-II Trouble Codes Repair Site


P0077 Intake Valve Control Solenoid Circuit High B1

OBD-II Trouble Code Technical Description

Article by

Dan Weller
ASE Certified Master Technician

Intake Valve Control Solenoid Circuit High (Bank 1)

What does that mean?

This code is a generic OBD-II powertrain code, that means it applies to all makes and models of vehicles (1996-newer), although specific repair steps may vary depending on the model.



On vehicles equipped with variable valve timing (VVT), the Engine Control Module / Powertrain Control Module (ECM/PCM) controls the camshaft position by regulating the engine oil through the control solenoid to change the position of the camshaft. The control solenoid is commanded using a Pulse Width Modulated signal (PWM) from the ECM/PCM. The ECM/PCM monitors this signal and if the voltage is above specification, it will set this trouble code and illuminate the Malfunction Indicator Lamp (MIL).

Bank 1 refers to the side of the engine with cylinder #1 - be sure to verify according to manufacturers specifications. The intake valve control solenoid is usually located on the intake manifold side of the cylinder head. This code is similar to codes P0075 and P0076. This code may also be accompanied by P0026.

Symptoms

Symptoms may include:
•Check engine light illuminated (Malfunction indicator lamp)
•Vehicle may suffer from poor acceleration and decreased fuel economy.

Potential Causes

Potential causes of a P0077 diagnostic trouble code may include:
•Wire harness poor connections or disconnected
•Control solenoid open circuit
•Short to power
•Faulty ECM

Diagnostic Steps

Wire harness - Check for unplugged harness connections, look for corrosion or loose wires to connectors. Unplug harness connectors from Solenoid and PCM, using a wiring diagram locate the + and - wires to the solenoid. The solenoid can be ground side or power side controlled, depending on the application. Check with factory wiring diagrams to determine the power flow in the circuit. Using a digital volt ohm meter (DVOM) set to the ohms setting, check for resistance between each end of the wire. An over limit reading on the DVOM may be an open in the wiring, loose connection or terminal.

Control solenoid - With the electrical harness to the solenoid unplugged, using the DVOM set to ohms, check for resistance between each of the electrical terminals on the control solenoid itself. Use the factory specifications or a known good control solenoid if available to determine if there is resistance in the solenoid. If there is an over limit or very low resistance reading on the DVOM, the solenoid is likely faulty.

Short to power - Unplug the harness to the PCM/ECM and locate the wires to the control solenoid. With the DVOM set to the volts scale, connect the negative lead to ground and the positive lead to the wire(s) to the control solenoid. Check for voltage, if there voltage present there may be a short to power in the wiring harness. Locate the short to power by unplugging harness connectors and testing the wiring back to the solenoid.

PCM / ECM - If all wiring and the control solenoid checks out okay, it will be necessary to monitor the solenoid during engine operation by back probing the wires at the PCM/ECM. Using an advanced scan tool that will read the engine functions, monitor the duty cycle commanded to the control solenoid. It will be necessary to monitor the solenoid during engine operation under various engine RPM's and load. Using an oscilloscope or graphing multimeter set to the duty cycle scale, connect the negative lead to a known good ground and the positive lead to either wire terminal at the solenoid itself. The reading on the multimeter tool should match the commanded duty cycle on the scan tool. If they are opposite, the polarity may be reversed - connect the positive lead on the other wire terminal to the solenoid and re-test to verify. If the signal detected from the PCM is constantly on, there may be a fault with the PCM itself.

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Right, that looks like them both now,

Col.