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How to test ignition control mould on a - Cars & Trucks

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Posted on May 11, 2014

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Code p0496 the purge valve on 09 gmc acadia. Replaced that now have code u0100.


DTC U0100-U0299
Circuit/System Description
The serial data circuit is the means by which the control modules in the vehicle communicate with each other. Once the scan tool is connected to the serial data circuit through the DLC, the scan tool can be used to monitor each module for diagnostic purposes and to check for diagnostic trouble codes (DTCs). When the ignition switch is in RUN, each control module communicating on the serial data circuit sends a state of health (SOH) message to ensure that the control module is operating properly. When a control module stops communicating on the serial data circuit, for example if the module loses power or ground, the SOH message it normally sends on the serial data circuit disappears. Other control modules on the serial data circuit, which expect to receive that SOH message, detect its absence; those control modules in turn sets a DTC associated with the loss of SOH of the non-communicating control module. The DTC is unique to the control module which is not communicating, for example, when the inflatable restraint sensing and diagnostic module (SDM) SOH message disappears, several modules set DTC U1088. Note: a loss of serial data communications DTC does not represent a failure of the module that set it.

U0100 00
Lost Communication with Engine/Powertrain Control Module (ECM/PCM)

Circuit/System Verification
Verify that following BCM DTCs are not present:
• U1814
• U2099
• B1428
• B1370
• B1380
• B1440
• B1441
? If any listed DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle to diagnose that DTC prior to this diagnostic.

Circuit/System Testing
Note: Use the schematic to identify the following:
• Control modules the vehicle is equipped with
• Control module locations on the low and high speed GMLAN serial data circuits
• The control modules B+, ignition, ground, communication enable and serial data circuit terminals
Determine the module that is not communicating. Refer to Control Module U Code List.
Ignition OFF, disconnect the necessary harness connector of the module that is not communicating.
Test for less than 5 ? between each ground circuit terminal and ground.
? If greater than the specified range, test the ground circuit for an open/high resistance.
If equipped, verify that a test lamp illuminates between each B+ circuit terminal and ground.
? If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit fuse is open, test the control circuits of the control module for a short to ground. If the circuits test normal, replace the control module.
If equipped, ignition ON, verify that a test lamp illuminates between each ignition circuit terminal and ground.
? If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit fuse is open, test the control circuits of the control module for a short to ground. If the circuits test normal, replace the control module.
Note: Only the high speed GMLAN modules have a serial data communication enable circuit OR an accessory wakeup serial data circuit, and the BCM is the output for these circuits. Refer to the module schematics to identify which modules have these circuits.
If equipped, ignition ON, verify that a test lamp illuminates between the communication enable circuit terminal OR the accessory wakeup circuit terminal and ground.
? If the test lamp does not illuminate, test the circuit for an open/high resistance. If the circuits test normal, replace the BCM.
Ignition OFF for 60 seconds, test for less than 5 ? between the serial data circuit terminals and the DLC terminal listed below:
• Class 2 serial data circuit terminal 2
• Low speed GMLAN serial data terminal 1
• High speed GMLAN serial data terminal 6 or 14
? If greater than the specified range, test the serial data circuit for an open/high resistance between the non communicating control module and a module setting the DTC or a serial data splice pack.
If all circuits test normal, replace the control module that is not communicating.

Apr 14, 2018 | GMC Cars & Trucks

1 Answer

I have a Pontiac G6 v6 3.9 .. I have a code p2078 twice.. do I have to change the intake manifold tuning valve sensor or what?


What year is it ?
DTC P2078: Intake Manifold Tuning (IMT) Valve Position Sensor Circuit High Voltage
Associated with this code or any coded is a diagnostic flow chart ,for testing of the electrical circuit's for the position sensor . If you don't know that ,an know how to test electrical circuit's ,your best bet , take it to a qualified repair . Rather then guessing an just replacing parts .

Circuit/System Description
An intake manifold tuning (IMT) valve is used to change the intake manifold plenum configuration. When the IMT valve is open, the intake manifold is configured to one large plenum. When the IMT valve is closed, the intake manifold is configured to 2 smaller plenums. The IMT valve improves engine performance at low and high engine speeds depending on the engine load. The IMT valve assembly consists of the following:
• A tuning valve
• A microprocessor
• An electric motor
• A hall-effect sensor
• An ignition voltage circuit
• A ground circuit
• An IMT valve control circuit
• An IMT valve signal circuit

P2078
The engine control module detects an open in the IMT valve ground or a continuous short to voltage in either the IMT valve signal circuit or the sensor. This diagnostic runs continuous when the conditions for running are met.
Test the electrical circuit's !!!!!!! you would need a wiring diagram

Circuit/System Testing
Ignition OFF, disconnect the IMT valve harness connector at the IMT valve.
Test for less than 1 ohm of resistance between the IMT valve ground circuit terminal B and ground.
? If greater than the specified value, test the ground circuit for an open/high resistance.
Ignition ON, verify that a test lamp illuminates between the IMT valve ignition 1 voltage circuit terminal A and ground.
? If the test lamp does not illuminate, test the IMT valve ignition 1 voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the fuse for the IMT valve ignition 1 voltage circuit is open, test or replace the IMT valve.
Connect a test lamp between the IMT valve control circuit terminal C and the IMT valve ignition 1 voltage circuit terminal A.
Command the IMT valve ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
? If the test lamp is always ON, test the IMT valve control circuit for a short to ground. If the circuit tests normal, replace the engine control module.
? If the test lamp is always OFF, test the IMT valve control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the engine control module.
Ignition ON, test for 4-6 volts between the IMT valve signal circuit terminal D and ground.
? If less than the specified range, test the IMT valve signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the engine control module.
? If greater than the specified range, test the IMT valve signal circuit for a short to voltage. If the circuit tests normal, replace the engine control module.
Install a 3A fused jumper wire between the IMT valve signal circuit terminal D and ground. Verify the scan tool IMT valve Feedback parameter transitions from 0-100 percent.
? If parameter does not change, test the IMT valve signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the engine control module.
If all circuits test normal, test or replace the IMT valve.

Apr 01, 2018 | Pontiac Cars & Trucks

1 Answer

2001 s10 no spark no power to fuel pumpe eng cranks over


Hello Gary,

Lets start with the no spark...


Diagnosis & Testing

http://www.autozone.com/repairinfo/repairguide/repairGuideContent.jsp?pageId=0996b43f803714e1


The Distributor Ignition (DI) system is controlled by the Powertrain Control Module (PCM).

The Distributorless Ignition System (DIS) is controlled by the Powertrain Control Module (PCM).

Testing The Ignition Coil

  1. Remove the ignition coil(s).
  2. Using an ohmmeter, check the resistance between the primary terminals on the underside of the coil. The resistance should be 0.50-0.90 ohms.
  3. Check the resistance between the secondary terminals. It should be 5000-10,000 ohms.
  4. If the coil failed either test, replace the coil.
If the coils(s) are good check the ignitions leads by measuring their resistance. (Multi Meter required.) If the coil(s) and leads are good

Secondary Spark Test
http://www.autozone.com/repairinfo/repairguide/repairGuideContent.jsp?pageId=0996b43f80371564


Please provide some details on your engine option 4 cylinder/6cylinder 2 WD 4 WD. Mileage...

Jul 24, 2016 | 2001 Chevrolet S-10

1 Answer

2012 Chevy Silverado low beam light not working.


Regular headlamps or HID ? Check the HDLP LO/HID relay in the under hood fuse / relay box . Will be marked on the inside of the lid . Do you know what a BCM is ? body control module. Could have DTC'S - diagnostic trouble codes stored .
DTC 2575 00: Headlamp Low Beam Control Circuit
  1. Ignition OFF, disconnect the low beam relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground.
  3. ?‡'
    If the test lamp illuminates, test the control circuit for a short to voltage.

  4. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.
  5. ?‡'
    If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

  6. Verify that a test lamp illuminates between the B+ circuit terminal 86 and ground.
  7. ?‡'
    If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.

  8. Ignition OFF, disconnect the harness connector at the inoperative low beam headlamp.
  9. Ignition OFF, scan tool OFF, exterior lamps OFF, test for less than 5.0 ohms between the ground circuit terminal B and ground.
  10. ?‡'
    If greater than the specified range, test the ground circuit for an open/high resistance.

  11. Connect the harness connector at the inoperative low beam headlamp.
  12. Connect a 40A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the low beam headlamps are activated.
  13. ?‡'
    If the low beam headlamps do not activate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the inoperative low beam headlamp.

  14. Connect a test lamp between the B+ circuit terminal 86 and the control circuit terminal 85.
  15. Command the Low Beams ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
  16. ?‡'
    If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.


    ?‡'
    If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.

  17. If all circuits test normal, test or replace the low beam relay.

May 25, 2016 | Cars & Trucks

1 Answer

Code p025a fuel pump module tested relay it is good why is there power on # 85 with key off


DTC P025A: Fuel Pump Flow Control Module Enable Circuit
The engine control module (ECM) supplies voltage to the fuel pump flow control module (FPCM) when the ECM detects that the ignition is on. The voltage from the ECM to the FPCM remains active for 2 seconds, unless the engine is in crank or run. While this voltage is being received, the FPCM closes the ground switch of the fuel pump and also supplies a varying voltage to the fuel tank pump module in order to maintain the desired fuel rail pressure.
Circuit/System Testing
  1. Ignition OFF, disconnect the harness connector at the FPCM.
  2. Ignition OFF, install a test lamp between the control circuit terminal 13 and ground.
  3. Ignition ON, verify that a test lamp illuminates for 2 seconds.
  4. ?‡'
    If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.

  5. If all circuits test normal, replace the FPCM.
Relay for what ? Which engine do you have LY6 or non LY6

Aug 24, 2015 | 2009 Chevrolet Silverado 1500

1 Answer

I have a saturn ion 06 coupe, neither of my windows are working! I have checked the fuse replaced both motord\regulators and the switches. They're still not working!! Plz help


Please do these check and let me know.

Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Circuit/System Description

The power window system will operate any time the ignition is the ACC or RUN position. The power window system will also operate whenever the body control module (BCM) is in retained accessory power (RAP) mode. The driver power window switch contains individual window switches for each of power windows. All windows may be controlled up and down from the driver power window switch. The individual passenger power window switches will only control the up and down operation of their respective power window.
Each power window contains a reversible power window motor. The direction the window travels is dependent upon the polarity of the supply voltage. By reversing polarity of the supply voltage the window motor will move up or down. Each power window motor is internally circuit breaker protected.
Battery voltage is supplied to the power window switch through the accessory voltage supply circuit. The power window switch also receives a constant ground source. The power window motor control circuits are connected to ground through the normally closed up and down contacts of the power window switch. When the power switch is placed in the down position, the power window motor down control circuit is switched to 12 volts and is applied to the down side of the power window motor. Since the other side of the power motor is connected to ground through the normally closed contacts of the up switch, the window travels down. By placing the power window switch in the up position, the polarity of the power window motor is reversed and the window travels up.

Reference Information

Schematic Reference Power Window Schematics
Connector End View Reference Power Door Systems Connector End Views
Description and Operation Power Windows Description and Operation
Electrical Information Reference

Circuit/System Verification

Ignition ON, command the appropriate door window UP and DOWN by pressing the appropriate Window switch. Observe the operation of the appropriate door window.

Circuit/System Testing

  1. Ignition OFF, disconnect the B+ harness connector at the Driver Window Switch.
  2. Ignition OFF, test for less than 1.0 ohm of resistance between the ground circuit terminal D and ground.
  3. ?X If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal E and ground.
  5. If the test lamp does not illuminate, test the B+ circuit for an open/high resistance. If the PWR WNDW fuse is open, test the circuit terminal C for a short to ground.
  6. If all circuits test normal, test or replace the Driver Window Switch.
  7. Ignition OFF, connect the harness connector at the Driver Window Switch.
  8. Ignition OFF, disconnect the Passenger Window Switch.
  9. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal and ground.
  10. ?X If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
  11. Ignition OFF, test for less than 1.0 ohm of resistance between the control circuit terminal H and ground.
  12. ?X If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the Driver Window Switch
  13. Ignition OFF, test for less than 1.0 ohm of resistance between the control circuit terminal D and ground.
  14. ?X If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the Driver Window switch
  15. Connect a test lamp between control circuit terminal H and control circuit terminal D.
  16. Ignition ON, command the passenger door window UP and DOWN by pressing the passenger window control on the Driver Window Switch. The test lamp should illuminate during either of the commands.
  17. ?X If the test lamp remains OFF, test for a short to ground or open/high resistance on either control circuit. If all circuits test normal, test or replace the Driver Window Switch.
  18. Ignition OFF, reconnect the Passenger Window Switch.
  19. Ignition OFF, disconnect the harness connector at the appropriate Window Motor.
  20. Ignition OFF, test for less than 1.0 ohm of resistance between the control circuit terminal A and ground.
  21. ?X If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the appropriate window switch.
  22. Ignition OFF, test for less than 1.0 ohm of resistance between the control circuit terminal B and ground.
  23. ?X If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the appropriate window switch.
  24. Connect a test lamp between control circuit terminal A and control circuit terminal B.
  25. Ignition ON, command the appropriate window UP and DOWN by pressing the appropriate Window Switch. The test lamp should turn ON when commanding the UP and DOWN states.
  26. ?X If the test lamp remains OFF during either of the commands, test for a short to ground on either control circuit. If all circuits test normal, test or replace the appropriate Window Switch
  27. If all circuits test normal, test or replace the appropriate Window Motor.

Component Testing

    Driver Window Switch
  1. Ignition OFF, disconnect the harness connector at the Driver Window switch.
  2. Test for infinite resistance between the signal terminals A and B and the B+ circuit terminal E with the passenger window switch in the INACTIVE position.
  3. ?X If less than infinite resistance, replace the Driver Window switch.
  4. Test for less than 2 ohms of resistance between the signal terminal A and the B+ circuit terminal E with the passenger window switch in the UP position.
  5. ?X If greater than 2 ohms, replace the Driver Window switch.
  6. Test for less than 2 ohms of resistance between the signal terminal B and the B+ circuit terminal E with the passenger window switch in the DOWN position.
  7. ?X If greater than 2 ohms, replace the Driver Window switch.
  8. Test for infinite resistance between the signal terminals F and H and the B+ circuit terminal E with the driver window switch in the INACTIVE position.
  9. ?X If less than infinite resistance, replace the Driver Window switch.
  10. Test for less than 2 ohms of resistance between the signal terminal F and the B+ circuit terminal E with the driver window switch in the UP position.
  11. ?X If greater than 2 ohms, replace the Driver Window switch.
  12. Test for less than 2 ohms of resistance between the signal terminal H and the B+ circuit terminal E with the driver window switch in the DOWN position.
  13. If greater than 2 ohms, replace the Driver Window switch
    Passenger Window Switch
  1. Ignition OFF, disconnect the harness connector at the Passenger Window switch.
  2. Test for infinite resistance between the signal terminals G and F and the B+ circuit terminal with the switch in the INACTIVE position.
  3. ?X If less than infinite resistance, replace the appropriate passenger Window switch.
  4. Test for less than 2 ohms of resistance between the signal terminal G and the B+ circuit terminal with the switch in the UP position.
  5. ?X If greater than 2 ohms, replace the appropriate passenger Window switch.
  6. Test for less than 2 ohms of resistance between the signal terminal F and the B+ circuit terminal with the switch in the DOWN position.
  7. ?X If greater than 2 ohms, replace the appropriate passenger Window switch.
      Window Motor
    1. Install a 30-amp fused jumper wire between the control terminal A and 12 volts. Momentarily install a jumper wire between the control terminal B and ground. The appropriate Window Motor should perform the UP or DOWN function.
    2. ?X If the function does not perform as specified, replace the appropriate Window Motor.
    3. Reverse the jumper wires; the appropriate Window Motor should perform the DOWN or UP function.
    4. ?X If the function does not perform as specified, replace the appropriate Window Motor

Mar 25, 2015 | 2006 Saturn ION

2 Answers

Changed everything for tune up still no spark


What make , model an year vehicle ? Is it coil on plug ignition system or dis ignition . Did you test for battery voltage at the coil or coils ? Is the powertrain control module controlling the coils ? Does it have a ignition control module ? Automotive Engine Ignition Coil Testing Repair How to test an ignition coil and ignition module with test light

Mar 17, 2015 | Cars & Trucks

1 Answer

I HAVE A 88 DOG DYNASTY THAT WILL NOT START I PUT A NEW BATT AND AN IGN CONTROL MOULD IN IT. HITLL NO TURN OVER I HAVE POWER BIY NO TURM OVER. MY NAME IS ERNEST THANK YOU


check for power to the small terminal on the starter motor solonoid when key is in the crank position ,get assistant to turn key and use a test light on the this small terminal feed wire then answer post and go from their

Sep 19, 2011 | 1988 Dodge Dynasty

1 Answer

1998 Ford Explorer XLT 4Lt 4x4 (Right hand Drive) Vin Nr 1FMDU34E1VZB76373 Our vehicle was in a hailstorm. All the moulds around the windows/glass are damage (doors frame moulds, fender glass mould,...


Call a junkyard, if they do not have the car, they can put it on the hotline and find it for you.

Since you are in S Africa, I have proviided a few #;s for you.

800-918-3704
877-259-4015
336-788-9122
336-499-5663

Oct 06, 2009 | 1998 Ford Explorer

1 Answer

SPLASHED WATER FROM CUP HOLDER INTO AC CONTROL MODULE PANEL IT FLASHED IUNTERMITTANTLY THEN WENT DARK. NO LIGHTS ARE ON NONE OF THE FUNCTIUON BUTTONS RESPOND. PLEASE ADVISE


go to car-part.com and buy a used one. Look on page with asterisk for lowest price.

Electronic or manual a/c?
Climate Control Assembly Removal
  1. Remove battery ground cable (14301). Refer to Section 14-01 .
  1. NOTE: The instrument panel upper moulding (04268) is retained by snap-in tabs.

    Remove the instrument panel upper moulding.
  1. Remove four screws from the A/C control (19980) and pull the control out of the instrument panel (04320).
  1. Remove the three electrical connectors and the vacuum hose harness (19C827) from the A/C control.


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Jun 27, 2009 | 1996 Lincoln Town Car

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