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I recently replaced the coils the icm cam sensor and crank sensor and still getting a p1350 code on my 94 lesabre . how can i fix this please?.?


DTC P1350 Bypass Line Monitor
Refer to Ignition Control, Knock Sensors .

Circuit Description
The Ignition Control Module (ICM) sends signals that the PCM requires for fuel control and spark advance calculations. At the start of engine crank, the ICM controls spark advance (Bypass mode.) When the second 3X reference pulse is recognized by the PCM, the PCM applies 5 volts to the Bypass circuit, commanding the ICM to switch spark advance to PCM control (IC mode). An open in the IC circuit or a short to voltage in the Bypass circuit at startup will cause the PCM to monitor IC pulses during crank, when the ICM should be grounding the IC circuit. This condition will set DTC P1350. The engine may be started but will run on Bypass mode timing.

Conditions for Setting the DTC
The PCM monitors IC pulses during crank while Bypass mode spark advance is commanded

Action Taken When the DTC Sets
The PCM will illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the diagnostic test has been run and failed.
The PCM will store conditions which were present when the DTC set as Freeze Frame and Failure Records data.
Conditions for Clearing the MIL/DTC
The PCM will turn OFF the MIL during the third consecutive trip in which the diagnostic has been run and passed.
The History DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
The DTC can be cleared by using the scan tool.
Diagnostic Aids
Check for the following conditions:

Poor connection at the PCM. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
Damaged harness. Inspect the wiring harness for damage. If the harness appears to be OK, disconnect the ICM, turn the ignition ON and observe a digital multimeter connected between the IC circuit and B+ while moving connectors and wiring harnesses related to the ICM. A change in voltage will indicate the location of the malfunction.
Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.

Test Description
Number(s) below refer to the step number(s) on the Diagnostic Table.

This vehicle is equipped with a PCM which utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). When the PCM is being replaced, the new PCM must be programmed.

Oct 14, 2016 | Cars & Trucks

1 Answer

1993 f150 no power to icm. Shut truck off to get fuel will not restart


The coil and the ICM both get power from a 30amp fuse which is powered from the key switch. Have you checked that circuit ? The wires are red and lite green.

Jun 02, 2013 | Cars & Trucks

2 Answers

98 toy sienna no spark no injector pulse coil and injectors have b+ but they have no ground signal


Dont worry about injection the rule of the is the same, correct for spark and establish it and fuel will come for spark you will need to trouble shoot CKP(cranksensor) and your ICM . The crank sensor is a alernating wave form and the ECM will only see its tope voltage and frequency or RPM, If the signal doesnt generate a good healthy signal ,your ECM will not give fuel injection pulse. The second problem you may be faced with ICM ,this include the Ignitor, its at the left strut tower, for now no spark I would start he trouble shoot at the cranksensor this include the terminalonnection and the toner wheel itself

May 04, 2011 | Toyota Sienna Cars & Trucks

1 Answer

I have a 92 corsica 3.1 all of a sudden it wont start. im getting a small spark from 4 and 6 but nothing from 2. any ideas? abot 2 years ago had to chg coil packs and icm. could either have fouled out...


if the battery voltage is not at full voltage this can cause a poor spark.this needs to be checked first as without proper voltage all testing is not accurate,i`m guessing that you have no check engine light on the dash when it was running so this eliminates a possible code set in the computer.if you check the connections at the icm and make sure they are clean as they get alot of debris thrown at them aver the year because of were they are mounted.were these new components when you changed them or used,this is a common problem with this system.you don`t say if cylinders 1-3-5 have any spark of any kind.it sounds like you may have a bad icm as you say cylinders 4-6 are weak spark and nothing from #2.without checking this out it sounds as the crank and cam sensor is working or you wouldn`t have any kind of spark.this narrows it down to icm or poor coils however it is very rare that 3 coils would all of a sudden go bad,again this indicates a bad icm

Mar 09, 2011 | 1992 Chevrolet Corsica

1 Answer

1996 FORD EXPLORER , MISS FIRE ON CYL # 2, 1ST REPLACED PLUGS AND WIRES, THEN THE COIL PACK AND LAST THE FUEL INJECTOR BUT PROBLEM STILL THERE, ANY HELP WOULD BE GREAT


OK,
Have you tried the following:


Ignition Control Module (ICM) REMOVAL & INSTALLATION NOTE: Only the EEC-IV ignition systems use an external ICM. EEC-V systems have incorperated the ICM into the Power Control Module (PCM).
  1. Disconnect the negative battery cable.
  2. Detach the wiring harness connector(s) from the ICM.
  3. Remove the mounting bolts, then remove the ICM. To install:
  4. Position the ICM onto the inner fender apron and install the mounting bolts. Tighten the bolts to 22–31 inch lbs (2.5–3.5 Nm).
  5. Attach the wiring harness connector(s) to the ICM.
  6. Connect the negative battery cable. Fig. 1: Ignition control module and mounting location on the 2.3L, 2.5L engine 89682g32.gif
    Fig. 2: Ignition control module used on all EEC-IV systems except the 2.3L engine 89682g33.gif
    Fig. 3: Ignition control module mounting on all EEC-IV systems except the 2.3L engine 89682g34.gif
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Jul 11, 2010 | 1996 Ford Explorer

2 Answers

I have a 1996 c1500 with a 305 it will start and run for about 3 mins than start running rough and then shut off.you have to wait about an hour before it will start again


Replace the fuel filter first and inspect your ICM (Ignition Control Module). Faulty ICM will fail when it starts to heat up and the engine will do what you have described.
Start with the simple and replace the fuel filter and have the ICM tested and replaced if it's bad. The wire leads to the ICM is also know to go bad from corrosion due to condensation that forms under the distributor cap.
Thank you for using fixya and keep us posted.

May 10, 2010 | 1996 Chevrolet C1500

1 Answer

How do you remove the ignition coil


Each ignition control module (ICM) has the following circuits:
An ignition 1 voltage circuit A chassis ground An ignition control circuit for each cylinder A low reference circuit
The PCM controls spark by pulsing the ignition control circuits to the ICM to trigger the coils and fire the spark plugs. The PCM and ICM are internally protected against shorts to power and ground on the ignition control circuits.

The spark plugs are connected to each coil by a short boot. The boot contains a spring that conducts the spark energy from the coil to the spark plug. The spark plugs are tipped with platinum for long wear and higher efficiency.


Ignition Control Module (ICM) Connectors

248af41.jpg

Fig. Ignition coil locations 2001-2004 4.8L, 5.3L, 6.0L Engines



Removal & Installation
2.2L (L61) Engine
  1. Turn OFF the ignition.
  2. Remove the accelerator cable from the bracket.
  3. Remove the accelerator cable bracket bolt.
  4. Remove the accelerator cable bracket.
  5. Disconnect the ignition control module (ICM) harness connector.
  6. Remove the ICM retaining screws.
  7. Remove the ICM from the ignition coil housing.

To install:
  1. Install the ignition control module in the ignition coil housing.
  2. Install the ICM retaining screws. Tighten the retaining screws.
  3. Connect the ICM harness connector.
  4. Install the accelerator cable bracket.
  5. Install the accelerator cable bracket bolt. Tighten the retaining screws.
  6. Install the accelerator cable to the bracket.

2.2L (Ln2) Engine
  1. Remove the air cleaner outlet from the air cleaner.
  2. Remove the ICM electrical connectors (1) and spark plug wires (2).
  3. Remove the ignition coils bolts (3).
  4. Remove the ignition coils and ICM assembly.
  5. Installation is the reverse of the removal procedure.

2.4L Engine
  1. Disconnect the negative battery cable.
  2. Remove the accelerator cable from the hold down clip.
  3. Remove the cruise control cable, if applicable.
  4. Remove the bolt from the fuel line retaining clip.
  5. Disconnect the 11-pin harness connector for the ignition control module (ICM).
  6. Remove the bolts from the ignition coil and the ICM assembly-to-camshaft housing.
  7. Remove the ignition coil and ICM assembly from the engine.
  8. Remove the screws that retain the housing to the cover.
  9. Disconnect the coil harness connector from the ICM.
    CAUTION When removing the housing from the cover, make sure the ground strap stays in place.
  10. Remove the housing from the cover.
  11. Remove the screws that retain the ICM to the cover.
  12. Remove the ICM from the cover.

    9f8592c.jpg
    Fig. Removing the ICM from the camshaft cover

To install:

CAUTION DO NOT wipe grease from the module or coil if the same module is to be replaced. If a new module is to be installed, a package of silicone grease will be included with the module. Spread the grease on the metal face of the module and on the cover where the module seats. This grease is necessary for module cooling.
  1. Install the ICM to the cover.
  2. Install the screws that retain the ICM to the cover.
  3. Install the ground strap, if necessary.
  4. Connect the ignition coils connector to the ICM.
    CAUTION When installing the housing to the cover, make sure the ground strap stays in place.
  5. Install the housing to the cover.
  6. Install the screws that retain the housing to the cover.
  7. Install the spark plug boots and the retainers to the housing, if necessary.
  8. Install the ICM assembly to the engine while carefully aligning the spark boots to the spark plug terminals.
    CAUTION The ICM cover bolts must be installed using isolator washers with the rubber side facing down.
  9. Install the bolts that retain the ICM assembly to the camshaft housing after coating the bolt threads with LOCTITE, or equivalent. Tighten the bolts to 16 ft. lbs. (22 Nm).
  10. Connect the ICM 11 pin harness connector.
  11. Install the bolt to the fuel line retainer clip.
  12. Install the accelerator cable into the hold down clip.
  13. Install the cruise control cable, if applicable. Connect the negative battery cable.

Hope this help (remember comment and rated this).

Apr 05, 2010 | 2000 Chevrolet Blazer

1 Answer

My 1998 gmc safari stopped working.when i turn the key on i dont here the pump turning on.could it be the fuel pump module?


Good chance your fuel sending unit has gone bad. Check all your fuses first and also common for the ground wire to corrode off the frame where the sending unit ground wire leads are connected. Start with the simple before you try to replace the fuel sending unit.
You can try spraying a little starter fluid through the air intake and see if the engine starts, if it does. Then you have a fuel issue, and if it doesn't start. The you have an ignition issue.
Ignition issue, check the wire lead to the coil and also check the ICM (ignition control module) which is located under the rotor in the distributor cap. Common for condensation to form there, promoting corrosion to the wire leads to the ICM.
Good luck and hope this help. Thank you for using Fixa

Mar 16, 2010 | 2001 Oldsmobile Alero

2 Answers

Installed new distributor in 97 Chevy Vortec V6


Check the wire harness to the Ignition control module (ICM) or replace it. It cost around $40,00 from Auto Zone and it's common for the ICM to fail, or it may just be starting to fail and it's also know that the OEM distributor had a screen vent at the bottom of the distributor for ventilation to prevent condensation from forming in the distributor. Check to make sure your new distributor has a vent and that it's not plugged up with shipping plastic. Condensation may be forming causing the misfire in the distributor. Good luck and keep me posted. 

Jul 16, 2009 | 1994 Chevrolet K1500

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