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Discussion Starter · #1 ·
hi. this atv will start after cranking for a bit then run for a minute then die. it will start again after cranking for a bit then stall out again. i dont see any efi code on the pod. how do i get my hands on a jumper plug so i can get the codes out. also what is the steps to get the codes. i can hear the pump whirring when i turn on the ign. but it will not stay running. do these atvs have fuel filters at all? i cant find it if they do. when it was running ok it would always stall after starting but would fire up and run with no problems. id like to get a pressure reading from the pump but not sure what everyone does to get the reading. tia.
 

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All you need is a paperclip to pull the codes. You either have a fuel pressure regulator issue or the TPS needs adjusting.
 

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Discussion Starter · #3 ·
this is what i found. will try it tomorrow.

ECU Error Codes
(EFI)
If a sensor fails or an out-of-tolerance signal is sensed
by the ECU, an error code will be generated by the
ECU. This will result in the analog needle swinging
full scale (if equipped) or the LCD gauge going blank
(if equipped). The EFI icon will flash.
To read the error code(s), use the following procedure.
1. Make sure the ignition switch is in the OFF position;
then remove the seat.
2. Locate the diagnostic plug next to the PDM; then
remove the black rubber cap.
3. Connect the Diagnostic Harness to the diagnostic
plug.
4. Turn the ignition switch to the ON position and
read the error code on the LCD. Refer to the following
ECU Error Code List to identify the specific
problem area.
ECU Error Code List
NOTE: Each of the following numerical codes will
have a two-letter prefix. A prefix of AC (Active
Code) or SC (Stored Code) will be displayed.
Always correct and clear Active Codes before
clearing Stored Codes.
• 00 = No Fault Detected (active code only)
• 12 = CKP (Crankshaft Position) Sensor*
• 13 = APS (Air Pressure Sensor) - H1
• 13 = MAP (Manifold Absolute Pressure) Sensor - H2
• 14 = TPS (Throttle Position Sensor)
• 15 = ECT (Engine Coolant Temperature) Sensor
• 16 = Speed Sensor
• 21 = IAT (Inlet Air Temperature) Sensor
• 23 = Tilt Sensor*
• 24 = Ignition Coil #1*
• 26 = Ignition Coil #2* - H2
• 32 = Fuel Injector #1*
• 34 = Fuel Injector #2* - H2
• 40 = ISC (Idle Speed Control) Valve
• 41 = Fuel Pump Relay*
• 60 = Cooling Fan Relay
• 95 = Sensor Power
• 96 = Incorrect ECU*
• 97 = ECU Memory Power (constant battery power)
• 98 = ECU to Gauge Comm Link - H2
• 99 = Start/Run Not Possible (active code only)
*Will initiate code 99.
After all active error codes are cleared, clear stored
error code(s) using the following procedure.
NOTE: The ignition switch should be in the OFF
position.
1. With the diagnostic harness connected to the diagnostic
plug and the drive select switch in the 4WD
position, hold the reverse override switch down
and turn the ignition switch to the ON position.
2. After ten seconds, release the reverse override
switch and turn the ignition switch to the OFF position;
then turn the ignition switch to the ON position.
The display should read AC00 (no fault detected).
NOTE: If the LCD still displays an error code, continue
troubleshooting the appropriate component.
3. Disconnect the diagnostic harness; then install the
black rubber cap.
4. Install the seat making sure it locks securely in place.

TPS INSTALLING/ADJUSTING
1. Place the TPS into position on the throttle body and
secure with the two screws. Do not tighten at this time.
2. Connect the main harness to the TPS.
3. Locate the diagnostic connector under the seat
next to the PDM; then install the test plug from
Test Plug/Error Code List kit onto the connector.
4. Turn the ignition switch to the ON position and
note the position of the TPS indicator icon (A, B,
or C); then adjust the TPS until the TPS icon
appears in the center position (B).
5. Tighten the mounting screws securely; then verify
the TPS icon appears in the center position (throttle
in idle position).
6. Cycle the throttle lever from idle to approximately
half throttle position several times; then return the
throttle to idle. The display should return to (B)
position.
7. Remove the test plug; then install the left-side
engine cover.
 

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Discussion Starter · #4 ·
ok...i adjusted the tps to spec. i put new fuel in after draining the old gas. i made sure the batt is charged right up at 13 volts. i didnt get any error codes as it was clear. it will start and run for about 20 seconds then dies. its like its out of gas. do you think its the pump ? i havent been able to check pressure on the pump yet. still trying to figure out how to seperate the rail from the hose. is the regulator a servicable part or is it part of the pump assy ? tia.
 

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Read this.
 

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Discussion Starter · #6 ·
ok. im going to update the pump to the aftermarket one. in your opinion where is the best place to get one in canada? i see lots of knock offs from china. this bike only has about 5-700 kms on it. it sits more than it gets used. can i use my old regulator or should i update that too ?
 

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Check fuel pressure first to confirm that is the issue.
 

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It’s low. 43 psi constant is a good pump. It may be the pressure regulator. I would also check / clean your injector before spending the money on a new pump. I’m cheap though lol
 

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Discussion Starter · #10 ·
im going to change the pump. it seems to operate the injector but not at all times. i will clean the injector just to be sure but i dont think this pump is up to snuff. is the regulator servicable with new o rings? if not what reg does everyone use to update?
 

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Discussion Starter · #12 ·
yup it was the pump. i pulled it all apart and checked the regulator. it was still good....rubbers were still soft and went back together tight. bought a legit walbro pump and got it to fit back with new plug. had to shave off just a bit of the locking lugs and dremel out the very bottom of the locking ring so i could use the fuel float again. pressured up and held at 43 psi. started and ran good so i think its all good again. thanks doorfx !!!

if i was going to do this again i would choose the walbro pump gss340 as the pickup is bigger and the filter sock is easy to extend if you need to. same pump but just different pickups.
 

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Thanks for the update!
 
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