FAULT CODE 2636 VGT Actuator Driver Circuit - …

1 View Related TopicOverviewCircuit DescriptionThe variable geometry turbocharger (VGT) is electronically activated by the VGT Actuator . TheVGT Actuator is a smart device that receives information via the j1939 data link from theprimary engine electronic control module (ECM). The VGT Actuator performs its owndiagnostics and reports failures back to the primary engine ECM, using the j1939 data LocationThe VGT Actuator is located on the turbocharger bearing to Procedure 100-002in Section diagnostic runs continuously when the keyswitch is in the ON position or when the engineis CODE 2636 vgt actuator driver circuit -Abnormal Update RateCODEREASONEFFECTF ault Code:2636 PID: S027 SPN:641 FMI: 9/9 LAMP: RedSRT:VGT Actuator Driver Circuit -Abnormal UpdateRate.

2 No communications on the j1939 data linkbetween the engine ECM and the smart VGT will moveto the default , ISC, and ISL-VGT Actuator CircuitPage1of22 VGT Actuator Driver Circuit -Abnormal Update Rate2/9/201210:46:45 PMThe primary engine ECM doesnotreceive a valid j1939 message from the VGT Actuator formore than 1 second. The ECM illuminates the red STOP ENGINE light immediately when the diagnostic runsand fails. The VGT will move to the default open ECM will turn off the red STOP ENGINE light and enable VGT operation immediately aftera valid j1939 message is received from the VGT TalkVerify the electronic control module (ECM) calibration is correct. Check the calibration revisionhistory found on QuickServe Online for applicable fixes to the calibration stored in the necessary, calibrate the ECM to Procedure 019-032 in Section FAULT code is logged when the primary engine ECM doesnotreceive valid J1939information from the VGT high inactive counts of FAULT Code 2636 as an active FAULT causes of this FAULT code include: The VGT Actuator isnotreceiving power from the ECM.

3 This could be caused by anopen Circuit in the power supply wire or low voltage supplied by the primary engine ECM An open return Circuit on the VGT Actuator Circuit An open or short Circuit on the j1939 data link Circuit between the ECM and VGTactuator Intermittent communications between the VGT Actuator and the primary engine ECM onthe j1939 data link Rapid cycling of the keyswitch Connector pins arenotinstalled in the appropriate locations specified by the wiringdiagram. A damaged termination resistor in the engine data link harness A damaged engine aftertreatment systemmustbe inspected after making the appropriate repair outlined inthis FAULT code troubleshooting tree. Progressive damage to the aftertreatment system mayhave occurred.

4 Perform the aftertreatment initial check procedure to test for a damaged dieselparticulate to Procedure 014-013 in Section procedure is found in the ISBCM2150 Service Manual, Bulletin to Procedure 014-013 in Section 14 Thisprocedure is found in the ISC and ISL CM2150 Service Manual, Bulletin and WarningsCAUTIONPage2of22 VGT Actuator Driver Circuit -Abnormal Update Rate2/9/201210:46:45 PMTroubleshooting StepsTo reduce the possibility of damaging a new ECM, all other active faultcodes must be investigated prior to replacing the reduce the possibility of pin and harness damage, use the followingtest lead when taking a measurement: Part Number 3822758-maleDeutsch /AMP /Metri-Pack test the FAULT for inactive Code 2636 inactive?

5 STEP the VGT Actuator the VGT actuatorand connector or damaged pins?STEP the J1939datalink resistor termination resistanceinside the VGT between 110 and 130ohms?STEP the voltage to theVGT is within 1-VDC of batteryvoltage?STEP the ECM and the ECM andengine harness connector or damaged pins?STEP the VGTactuator voltage at the the batterysupply voltage to the the ECM andengine harness connector or damaged pins?STEP the j1939 datalink termination for an open inPage3of22 VGT Actuator Driver Circuit -Abnormal Update Rate2/9/201210:46:45 PMGuided Step 1-Check the FAULT Step 1A-Check for inactive FAULT j1939 data link for a shortcircuit in the j1939 data for a shortcircuit to ground in the j1939 datalink the FAULT the FAULT for progressivedamage to the damage to theaftertreatment system found during theSnap Acceleration Test?

6 STEP the FAULT Code 2636 inactive?STEP the inactive FAULT codes cleared?Conditions Turn keyswitch ON. Connect INSITE electronic for inactive FAULT codes. Use INSITE electronic service toolto read the FAULT Code 2636 inactive? FAULT Code 2636 inactive?YESNOPage4of22 VGT Actuator Driver Circuit -Abnormal Update Rate2/9/201210:46:45 PMGuided Step 2-Check the VGT Actuator Step 2A-Inspect the VGT Actuator and connector RepairNo RepairRefer to Procedure 019-362 in Section to 2 AConditions Turn keyswitch OFF. Disconnect the VGT Actuator fromthe engine the engine harness and VGTactuator connector pins for the following: Loose connector Corroded pins Bent or broken pins Pushed back or expanded pins Moisture in or on the connector Missing or damaged connector seals Dirt or debris on or in the connectorpins Connector shell broken W ire insulation damage Damaged connector locking the following procedure for generalinspection to Procedure019-361 in Section or damaged pins?

7 Dirty or damaged pins?YESNOA damaged connection has been detected inthe harness or VGT Actuator RepairPage5of22 VGT Actuator Driver Circuit -Abnormal Update Rate2/9/201210:46:45 PMGuided Step 2B-Check the j1939 data link resistor termination resistanceinside the VGT Actuator . Clean the connector and pins. Repair the damaged harness,connector, or pins, if possible. Refer to Procedure 019-043 in the VGT Actuator . Refer to Procedure 010-134 in procedure is found in the ISBCM2100 and CM2150 Service Manual,Bulletin 4021578. Refer to Procedure 010-134 in procedure is found in the ISCand ISL CM2150 Service Manual,Bulletin to 4 AGo to 2 BConditions Turn keyswitch OFF. Disconnect the VGT Actuator fromthe engine the j1939 data link resistance.

8 Measure the resistance between theSAE j1939 data link (+) wire and theSAE j1939 data link (-) wire at theVGT Actuator the following procedure for generalresistance measurement to Procedure 019-360 in Section between 110 and 130 ohms?Resistance between 110 and 130 ohms?YESNOPage6of22 VGT Actuator Driver Circuit -Abnormal Update Rate2/9/201210:46:45 PMGuided Step 2C-Check the voltage to the VGT RepairThe j1939 data link termination resistor isdamaged in the VGT Actuator . Replace the VGT Actuator . Refer to Procedure 010-134 in procedure is found in the ISBCM2100 and CM2150 Service Manual,Bulletin 4021578. Refer to Procedure 010-134 in procedure is found in the ISCand ISL CM2150 Service Manual,Bulletin to 2 CGo to 4 AConditions Turn keyswitch OFF.

9 Disconnect the VGT actuatorfrom the engine harness. Turn keyswitch the power supply and returncircuit to the VGT the voltage between theVGT Actuator power SUPPLY circuitand the VGT Actuator RETURN Circuit at the engine harnessNOTE: Check the voltage at key-ONand while cranking the to the Circuit diagram or thewiring diagram for connector is within 1-VDC of batteryvoltage?Voltage is within 1-VDC of battery voltage?Page7of22 VGT Actuator Driver Circuit -Abnormal Update Rate2/9/201210:46:45 PMGuided Step 3-Check the ECM and engine Step 3A-Inspect the ECM and engine harness connector RepairNo RepairGo to 3 BGo to 3 AConditions Turn keyswitch OFF. Disconnect the engine harness fromthe ECM the engine harness and ECMconnector pins for the following: Loose connector Corroded pins Bent or broken pins Pushed back or expanded pins Moisture in or on the connector Missing or damaged connector seals Dirt or debris on or in the connectorpins Connector shell broken W ire insulation damage Damaged connector locking the following procedure for generalinspection to Procedure019-361 in Section or damaged pins?

10 Dirty or damaged pins?YESNOR epair the damaged pins. Repair or replaceNo RepairPage8of22 VGT Actuator Driver Circuit -Abnormal Update Rate2/9/201210:46:45 PMGuided Step 3A-1-Check the VGT Actuator voltage at the engine harness, OEM harness, orreplace the ECM, whichever has thedamaged pins. Flush the dirt, debris or moisture fromthe connector pins. Use electroniccontact cleaner, Part Number 3824510 Install the appropriate connector seal ifit is damaged or missing Repair the engine toProcedure 019-220 in Section 19. Replace the engine toProcedure 019-043 in Section 19. Repair the OEM toProcedure 019-208 in Section 19. Replace the OEM harness. Refer tothe OEM service manual. Call for pre-authorization to replace theECM.