Question about 1994 Chevrolet C3500

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How do you erase obd 1 codes?

Must you erase codes before setting ignition timing

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Disconnect battery for more than 20 secs.

Posted on May 18, 2016

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Posted on Jan 02, 2017

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How do I clear default codes


If built after 1996, use a scanner or code reader to erase codes. If built before 1996, to erase codes just take off the negative battery terminal for a few minutes. All before 1996 use OBD-1 (On Board Diagnostics, first generation). After 1996, all management systems are called OBD-2. It's a federal requirement for all vehicles sold in the US, using a common plug to hook any scanner to the engine for diagnostics.

Feb 17, 2016 | Cars & Trucks

2 Answers

Cylinder 1 misfire detectedrich or lean air/fuel mixture fuel injecter fault and faulty crank shaft sensor


Wow... Thats a lot of diagnostic codes. First... The cyl #1 misfire will cause the Engine to run rich giving you a rich running engine. Therefore the rich lean code. This misfire on cyl #1 can also throw a crankshaft sensor code as it will slow down engine rpm. I would change the spark plug and ignition coil to cyl#1 and have the codes erased and see if that solves the problem. If not, you then need to persue any codes that may reappear.

Jun 06, 2015 | 1999 Kia Sephia

1 Answer

What causes obd code u110c


U110C-NO FUEL LEVEL BUS MESSAGE
When Monitored and Set Condition:
U110C-NO FUEL LEVEL BUS MESSAGE
When Monitored: Ignition on.
Set Condition: No fuel level BUS messages received by the PCM for 20 seconds.
POSSIBLE CAUSES
DTC RESET
COMMUNICATE WITH BCM
FUEL LEVEL BUS MESSAGE
PCI BUS CIRCUIT OPEN FROM PCM TO BCM
BCM
TEST ACTION APPLICABILITY
1 NOTE: If a fuel level circuit or performance DTC is set along with P1681,
diagnose the circuit/performance DTC before continuing.
Turn the ignition on.
With the DRBIIIt, erase DTCs.
Start the engine on and off several times. Leave the engine running for at least 20
second each time.
With the DRBIIIt, read DTCs.
Does the DTC reset?
All
Yes ! Go To 2
No ! Refer to the INTERMITTENT CONDITION symptom in the
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER - 1 - NGC.
2 Ignition on, engine not running.
With the DRBIIIt, attempt to communicate with the BCM.
Can communication be established with the BCM?
All
Yes ! Go To 3
No ! Refer to the Communication Category and perform the appropriate
symptom related to no communication with BCM.
Perform POWERTRAIN VERIFICATION TEST VER - 1 - NGC.
3 Turn the ignition on.
Using the DRBIIIt, read the Fuel Level parameter in the PCM.
Does the DRBIIIt display a fuel level value?
All
Yes ! Replace and program the Powertrain Control Module in accordance
with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 1 - NGC.
No ! Go To 4
287
DRIVEABILITY - NGC
TEST ACTION APPLICABILITY
4 Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the BCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS
RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the PCI Bus circuit from the BCM harness connector to the
appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes ! Replace BCM in accordance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 1 - NGC.
No ! Repair the PCI Bus circuit between the PCM and the BCM for an
open.
Perform POWERTRAIN VERIFICATION TEST VER - 1 - NGC
__________________

Jan 13, 2013 | 2006 Dodge Caravan

1 Answer

I had a check engine light come on when the vehicle was running bad. The OBD code read P0421. I pulled the plugs cleaned and gapped the, checked wires and started the car. It is running great now, but I...


When the codes were read the first time, did the person doing the scanning then erase the codes? The codes are not erased until the scanner performs that function. Or did the light come back on?
If the code was set again, you will find loads of information here on that code and what it means. Warm Up Catalyst Below Threshold -Bank 1. The front catalytic converter is not showing effective performance as measured by the oxygen sensor on bank 1 (bank 1 is the side where your number 1 cylinder is on). This happened from it running bad. But now great, so...question is how long did it run bad? You may already have a bad converter or oxygen sensor. Pay for diagnosing or try a new o2 sensor, good luck.

Jun 19, 2012 | 2000 Mazda MX-5 Miata

1 Answer

Fault code p1406


Codes

Print
Stored fault codes may be erased from memory at any time by removing power from the VCM for at least 30 seconds. It may be necessary to clear stored codes during diagnosis to check for any recurrence during a test drive, but the stored codes must be written down when retrieved. The codes may still be required for subsequent troubleshooting. Whenever a repair is complete, the stored codes must be erased and the vehicle test driven to confirm correct operation and repair.

WARNING The ignition switch must be OFF any time power is disconnected or restored to the VCM. Severe damage may result if this precaution is not observed.
Depending on the electrical distribution of the particular vehicle, power to the VCM may be disconnected by removing the VCM fuse in the fusebox, disconnecting the in-line fuse holder near the positive battery terminal or disconnecting the VCM power lead at the battery terminal. Disconnecting the negative battery cable to clear codes is not recommended as this will also clear other memory data in the vehicle such as radio presets.
The following are the codes for the 1994-95 models with the OBD I and OBD II systems.
See Figure 1 through 6


0996b43f8021e116.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 1: DTC chart for 1994 ECM models


0996b43f8021e117.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 2: DTC chart for 1994 PCM models


0996b43f8021e118.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 3: DTC chart for 1994-95 VCM models


0996b43f8021e119.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 4: DTC chart for 1995 PCM models


0996b43f8021e11a.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 5: DTC chart for 1995 VCM-A models


0996b43f8021e11b.jpg

May 27, 2012 | 1995 GMC Jimmy

3 Answers

Can't get my 96 chev s-10 to pass inspection due to Not ready codes. I recently change the battery and have driven the veh about 200 miles. Autozone checked and said it was all good but the state...


Here is the drive cycle procedure for that vehicle, and let me know if you require any further assistance.


Running an OBD-II Drive Cycle

The purpose of the OBD-II drive cycle is to run all of the onboard diagnostics. The drive cycle should be perfomed when any trouble codes are erased from the PCM or if the battery was dis-connected. Performing the drive cycle will reset the monitors so that any further trouble codes can be detected.

The OBD-II system drive cycle begins with a cold start with the coolant temperature below 120 degrees F. and the coolant and the air temperature sensors within 10 degrees of each other. (The ignition key must not be "on" or in the "Run" position until the cold start or the heated O2 sensor diagnostic might not start)

1. As soon as the vehicle starts up, idle the engine in drive for two and a half minutes with the AC and the rear defrost on if equipped with a rear window defroster. The OBD-II will check the O2 sensor circuits, the air pump, and the EVAP purge.

2. After the two and a half minutes turn off the AC and the rear window defrost, and then accelerate to 55 mph at half throttle. OBD-II checks for any ignition mis-fires, fuel trim, and canister purge.

3. Hold steady at 55 mph for three minutes. OBD-II monitors the EGR system, the air pump, the O2 sensors and the canister purge.

4. After the three minutes decelerate down to 20 mph without using the brakes or the clutch. OBD-II checks the EGR and the purge functions.

5. Accelerate back up to 55 mph at half throttle. OBD-II checks for mis-fires, fuel trim, and purge functions again.

6. Hold steady at 55 mph for five minutes. OBD-II will monitor catalytic converter efficiency, for any mis-fires, EGR function, fuel trim, O2 sensor operation, and purge functions.

7. Decelerate to a stiop without using the brakes or the clutch. OBD-II makes a final check of the EGR system and the canister purge functions.

Sep 12, 2010 | 1996 Chevrolet S-10 Pickup

2 Answers

Honda crv 2000 Real time awd have a white smoke on


When the engine is cold place a piece of paper in front of exhaust pipe and see if that white smoke contains oil in it.
If it is oil it means a cracked block or worn rings in engine which means very expensive repair or replacement of engine.

If steam is coming out exhaust then water is escaping from the head gasket into the fuel chamber of the piston and is being ignited and turned into steam. A blown head gasket or worse a warped engine head may be the cause. A engine compression test would rule this out as a cause .

Mar 30, 2017 | Cars & Trucks

1 Answer

After changing an o2 sencer on a 2002 yukon how do you reset the computer


YOU NEED A SCANNER ERASE CODE ON THE OBD 2 COMPUTER CONTROL CARS. THE CARS WITH OBD 1 COMPUTERS YOU COULD REMOVE THE NEGATIVE BATTERY CABLE FOR A MINUTE TO ERASE CODE.

Apr 28, 2010 | GMC Yukon XL Cars & Trucks

1 Answer

After replacing an oxygen sensor, how can i reset


U can reset the light with a OBD 2 code reader (prefered method) or u can disconnect the battery NEGATIVE cable for 5 minutes, this erases everything including radio stations and time settings, so if u klnow anyone with a OBD 2 code reader do it that way.

Apr 15, 2010 | 2000 Nissan Maxima

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