How do you check an automobile Ignition Coil on a 1973 Datsun 240 Z when the ignition coil is't connected to the automobile electrical system? Can this be done? If so please tell me How!!!!!!! THANK YOU VERY MUCH.

possible causes for code P0300
you've already change coil and plug....

P0300 could be bad #3 plug or coil... switch those also and see if code change..

if it persist try the next thing..

I would try trading fuel injector 4 to 5 and putting 5 into 4 and see which code you get.....

• Faulty spark plug (s)
• Faulty ignition coil (s)
• Clogged or faulty fuel injector (s)
• Intake air leak
• Fuel injectors harness is open or shorted
• Fuel Injectors circuit poor electrical connection
• Ignition coils harness is open or shorted
• Ignition coils circuit poor electrical connection
• Insufficient cylinders compression
• Incorrect fuel pressure

code P0305 is simmilar....

• Faulty spark plug 5
• Clogged or faulty fuel injector 5
• Faulty ignition coil 5
• Fuel injector 5 harness is open or shorted
• Fuel injector 5 circuit poor electrical connection
• Ignition coil 5 harness is open or shorted
• Ignition coil 5 circuit poor electrical connection
• Insufficient cylinder 5 compression
• Incorrect fuel pressure
• Intake air leak

Direct Ignition cylinder ignition system that ignites one cylinder with one coil.
Possible causes.
Ignition Coil No. 3
Ignition Coil No. 3 harness is open or shorted
Ignition Coil No. 3 circuit poor electrical connection
Possible bad ECM, Electronic Control Module

To Remove......
1. Remove the spark plug wire from the ignition coil.
2. Disconnect the ignition coil electrical connector.
3. Remove ignition coil bolts.
4. Remove ignition coil.

To Install.....
1. Install ignition coil.
2. Install ignition coil bolts.
3. Tighten ignition coil bolts to 8 Nm the same as 71 inch pounds.
4. Connect ignition coil electrical connector.
5. And finally, install spark plug wire to ignition coil.

Vehicles: Escalade, Suburban, Tahoe, Yukon, Denali, DenaliXL, YukonXL 1999-2005 with Distributorless Ignition System

Normally I'd recommend that you check your ICM (Ignition Coil Module), but the ICM in this vehicle is an integral component of the PCM (Powertrain Control Module), and is not separately serviceable.

In the US, one can go to Advance Auto Parts/AutoZone/Pep Boys, and get a free "ignition system check" which will tell you whether your alternator/voltage regulator may be failing/marginal. Also, by disassembling your battery and carrying it into the store, you can get a free battery load test on their in-store tester.

Also, you'll want to get a free "Check Engine Light" test from Advance/AutoZone/Pep Boys, since that'll give any DTC (Diagnostic Trouble Codes) that the car's PCM may have stored. Once you have any DTC's stored by you car's computer, check the chart at the end of this solution for their interpretation - codes whose numbers exceed 1000 are Cadillac-specific codes. All of the included codes are stored in response to ignition coil faults.

These instructions apply whether your Escalade has a 5.3L or 6.0L engine.

Table of Contents:
Sec 1 - Adjustments - Ignition Timing
Sec 2 - Distributorless Ignition System - Description
Sec 3 - Ignition Coils - Removal and Installation
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SEC 1
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Adjustments - Ignition Timing

Ignition timing is preset and cannot be adjusted. Ignition timing is controlled by the Powertrain Control Module (PCM).

On V6 motors the distributor is located in a fixed, non-adjustable position. DO NOT attempt to rotate the distributor otherwise damage may result.

On V8 engines the distributor can be rotated for proper alignment of the rotor to the cap. The engine base timing is not adjustable by rotating the distributor.

The 4.3L, 5.0L, 5.7L and 7.4L engines use a distributor ignition system.

The 4.8L, 5.3L, 6.0L and 8.1L engines use a distributorless ignition system.
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SEC 2
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Distributorless Ignition System - Description


The 4.8L, 5.3L, 6.0L and 8.1L engines do not incorporate a distributor to deliver energy from a common coil to the individual spark plugs. The electronic ignition (EI) system is responsible for producing and controlling a high energy secondary spark. This spark is used to ignite the compressed air/fuel mixture at precisely the correct time. This provides optimal performance, fuel economy, and control of exhaust emissions.

This ignition system consists of a separate ignition coil connected to each spark plug by a short secondary wire. The driver modules within each coil assembly are commanded ON/OFF by the powertrain control module (PCM). The PCM primarily uses engine speed and position information from the crankshaft and camshaft position (CMP) sensors to control the sequence, dwell, and timing of the spark.

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SEC 3
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Ignition Coils - Removal & Installation


The ignition coil module is integrated in the Powertrain Control Module (PCM). Individual replacement is not possible, the entire PCM would need to be replaced.

Ignition Coils - Removal & Installation

If equipped with Regular Production Option (RPO) HP2, disconnect the Energy Storage Box (ESB).

Remove the spark plug wire from the ignition coil.

Disconnect the ignition coil electrical connector.

If equipped with regular production option (RPO) HP2, remove the auxiliary heater water pump bracket bolts.



Fig. 1 Removing the auxiliary heater water pump

Remove the auxiliary heater water pump from the studs, and reposition out of the way.

If equipped with RPO HP2, remove the starter/alternator control module (SGCM) cover bolts, and cover.

Remove the 3-phase cable nuts to the SGCM.

Remove the 3-phase cable from the SGCM.

Remove the 3-phase cable bracket nuts.

Remove the 3-phase cable bracket from the studs, and reposition the cable and bracket out of the way.




Fig. 2 Starter/Alternator Control Module Electrical Connections

Remove the ignition coil bolts. (see image below)





Fig. 3 Removing the ignition coil bolts

Remove the ignition coil.

To install:

Install the ignition coil.

Install the ignition coil bolts.
Tighten the bolts to 71 inch lbs. (8 Nm).

If equipped with RPO HP2, position the cable (w/bracket) and install the 3-phase cable bracket to the studs.
Install the 3-phase cable bracket nuts and tighten the nuts to 133 inch lbs. (15 Nm).

Install the 3-phase cable to the SGCM.

Install the 3-phase cable nuts to the SGCM and tighten the nuts to 80 inch lbs. (9 Nm).

Install the SGCM cover and bolts.

Tighten the bolts to 80 inch lbs. (9 Nm).



Fig. 4 Starter/alternator control module electrical connections (again)

If equipped with RPO HP2, position the auxiliary heater water pump and install it onto the studs.
Install the auxiliary heater water pump bracket bolts and tighten the bolts to 133 inch lbs. (15 Nm).




Fig 5 Removing the Auxiliary Heater Water Pump

Connect the ignition coil electrical connector.

Install the spark plug wire to the ignition coil.

If equipped with RPO HP2, connect the ESB

Testing

Connect scan tool to vehicle's Data Link Connector and follow scan tool instructions to download diagnostic Trouble Codes (DTCs) to the scan tool.

Diagnostic Trouble Code (DTC) list:

DTC P0351: Ignition Coil 1 Control Circuit
DTC P0352: Ignition Coil 2 Control Circuit
DTC P0353: Ignition Coil 3 Control Circuit
DTC P0354: Ignition Coil 4 Control Circuit
DTC P0355: Ignition Coil 5 Control Circuit
DTC P0356: Ignition Coil 6 Control Circuit
DTC P0357: Ignition Coil 7 Control Circuit
DTC P0358: Ignition Coil 8 Control Circuit
DTC P1351: Ignition Coil Control Circuit High Voltage
DTC P1361: Ignition Coil Control Circuit Low Voltage

If a DTC indicates an ignition coil is faulty before replacing the ignition coil check wiring for short circuits, broken or chafed wires, loose connections and corroded terminals.

Positive Crankcase Ventilation (PVC) Valve Removal & Installation 5.7L Engine To Remove:

1.The PCV valve is mounted into the top/right side of the intake manifold.

2.The PCV valve is sealed to the intake manifold with two O-rings.

3.Free the PCV valve by rotating counter-clockwise 90 degrees until the locating tabs align with the openings on the manifold.

4.Remove the PCV valve by pulling straight up from intake manifold and clearing the tabs.

5.Check the condition of two valve O-rings.

To Install:

1. Clean the PCV valve opening on the intake manifold.
2. Inspect the PCV valve O-rings. Replace if suspect.
3. Apply engine oil to the two O-rings.
4. Place the PCV valve into intake manifold.
5. Rotate the valve 90 degrees clockwise for installation.

6.1L Engine To Remove:

1. The PCV valve is threaded into the right-front corner of the intake manifold.
   
2. Remove the rubber hose from the PCV valve.
   
3. Unscrew the PCV valve from the intake manifold.
   

To Install:

1. Clean the PCV valve opening on the intake manifold.
   
2. Check the condition of the PCV valve O-ring. Replace if suspect.
   
3. Check the condition of the PCV valve threads and clean if necessary.
   
4. Apply engine oil to the O-ring.
   
5. Install the PCV valve into intake manifold.
   
6. Install the rubber hose to the PCV valve.
   

The spark plugs should lead to the coil pack via a spark plug wire but may be hidden by a plastic cover.

The following details the ignition coil changing on the Chrysler 300:

2.7L Engine To Remove:

1. Disconnect the negative battery cable.
2. Remove the intake manifold.
3. Use compressed air to clear the area around the ignition coil and spark plug.
4. Disconnect the electrical connector from the ignition coil.
5. Remove the two fasteners securing the ignition coil.
6. Remove the ignition coil.

To Install:

1. Install the ignition coil.
2. Tighten the fasteners to 55 in-lb (6.2 Nm).
3. Connect the electrical connector to the ignition coil.
4. Install the intake manifold.
5. Connect the negative battery cable.

3.5L Engine To Remove:

1. Disconnect the negative battery cable.
2. Remove the intake manifold.
3. Use compressed air to clear the area around the ignition coil and spark plug.
4. Disconnect the electrical connector from the ignition coil. NOTE: Loosen the ignition coil fasteners by alternating back and forth. Do not lose the spacers under the coil when loosening the fasteners.
   
5. Remove the two fasteners securing the ignition coil.
6. Remove the ignition coil.

To Install:
NOTE: Tighten the ignition coil fasteners by alternating back and forth. Do not lose the spacers under the coil when installing the coil.

1. Install the ignition coil.
2. Tighten the fasteners to 60 in-lb (6.7 Nm).
3. Connect the electrical connector to the ignition coil.
4. Install the intake manifold.
5. Connect the negative battery cable.

5.7L Engine (2005) To Remove:
NOTE: Carefully note the position of each spark plug cable before disconnecting them so they can be installed in their original positions to prevent misfire.
NOTE: The throttle body intake air duct or intake air box may need to be removed to gain access to certain ignition coils.

1. Disconnect the electrical connector from the ignition coil.
2. Remove the secondary ignition cable from the coil.
3. Use compressed air to clear the area around the ignition coil.
4. Remove the two fasteners securing the ignition coil. Bolts are retained to coil.
5. Remove the ignition coil. Pull with a slight twisting motion to help release the boot seal with the spark plugs.

To Install:
NOTE: Apply a light film of dielectric grease to the inside of the coil boots before installation.

1. Clean area around spark plug and coil mounting area with compressed air.
2. Install the ignition coil.
3. Tighten the fasteners to 105 in-lb (12 Nm).
4. Connect the electrical connector to the ignition coil.
5. Connect the secondary ignition cable to the coil.
6. Install the air duct or air box if removed.

Ignition coil mounting bolts (5.7L & 6.1L engines)

5.7L (2006) & 6.1L Engine To Remove:
NOTE: Each ignition coil, mounted on the valve cover, fires two spark plugs at each cylinder.

1. Disconnect the negative battery cable.
2. Use compressed air to clear the area around the ignition coil and spark plug.
3. Disconnect the electrical connector from the ignition coil.
4. Remove the two fasteners securing the ignition coil.
5. Remove the ignition coil. Pull with a slight twisting motion to help release the boot seal with the spark plugs.

To Install:
NOTE: Apply a light film of dielectric grease to the inside of the coil boots before installation.

1. Install the ignition coil.
2. Tighten the fasteners to 105 in-lb (12 Nm).
3. Connect the electrical connector to the ignition coil.
4. Connect the negative battery cable.

Ignition Coil Removal & Installation To Remove:

1. Before servicing the vehicle, refer to the precautions at the beginning of this section.
2. Remove or disconnect the following:
   • The spark plug cables from coil pack
   • The electrical connector Coil Pack
     
     
   • The ignition coil fasteners

To Install:

1. Install or connect the following:
   • Ignition coil fasteners
     1. Torque to: 105 inch lbs. (12 Nm)
   • The electrical connector Ignition Wire I.D.
     
     
   • The spark plug cables to coil pack

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Ignition Coil-On-Plug Removal & Installation To Remove:

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2. Remove or disconnect the following:
   • Electrical connector from ignition coil. NOTE: On 3.5L engines, it is necessary to loosen the screws by alternating back and forth. Do not lose the spacers under the coil when loosening the screws.
     
   • 2 fasteners from ignition coil assembly
   • Ignition coil assembly.

To Install:

1. Install or connect the following:
   • Ignition coil assembly
   • Screws
     1. 2.7L engine - 55 inch. lbs. (6.2 Nm)
     2. 3.2L engine - 60 inch. lbs. (6.7 Nm)
     3. 3.5L engine - 60 inch. lbs. (6.7 Nm)
2. Connect the electrical connector.

Ignition Coil Removal & Installation 4.2L Engine To Remove:

1. Before servicing the vehicle refer to the precautions at the beginning of this section.
2. Remove or disconnect the following:
   • The ignition coil electrical connector
   • The spark plug wires (marking for reinstallation) CAUTION
     Each sparkplug wire must be connected to its correct ignition coil terminal.
     
   • The ignition coil
   • The bolts
3. Inspect the ignition coil for carbon tracks or damage.

To Install:

1. Inspect the ignition coil for carbon tracks or damage.
2. Install or connect the following:
   • The bolts
     1. Torque To: 53 inch-lbs (6 Nm) (2005-2006)
     2. Torque to: 62 inch-lbs (7 Nm) (2007)
     CAUTION
     Each sparkplug wire must be connected to its correct ignition coil terminal.
     
   • The spark plug wires (marking for reinstallation)
   • The ignition coil electrical connector
   • The ignition coil

4.6L and 5.4L Engines To Remove:

1. Before servicing the vehicle refer to the precautions at the beginning of this section.
2. Remove or disconnect the following:
   • The negative battery cable
   • The ignition coil electrical connector
   • The ignition coil retaining bolt
3. Rotate the ignition coil clockwise 30-40 degrees to clear the fuel injection supply manifold.
4. Remove the ignition coil with a twisting motion while pulling up.

To Install:

1. Install or connect the following:
   • Dielectric compound to the inside of the coil boots
   • The ignition coil with a twisting motion while pushing down
   • The ignition coil retaining bolt
     1. Torque to 53 inch-lbs (6 Nm) for (4.6L 2004 and 5.4L 2004-2007)
     2. Torque to 89 inch-lbs (10 Nm) for (4.6L 2005-2007)
   • The ignition coil electrical connector
   • The battery ground cable

NOTE: Ensure that the ignition coil spring is correctly located inside the ignition coil boot and that there is no damage to the tip of the boot.

On older types 240 there was some kind of antitheft system connected with the steering lock. Try to route a lead from the battery to the ignition coil and se if it starts.
I drove a 240 with a separate ignition switch all through high school.

　
　
Ignition Coil
Removal & Installation
4.2L Engine
1997-2000
To Remove:
Before servicing the vehicle refer to the precautions at the beginning of this section.
Remove or disconnect the following:
The ignition coil electrical connector
The radio ignition interference capacitor connector
The locking tabs
The six ignition wires, marking for reinstallation
The brackets
The spark plug wire set
CAUTION
Spark plug wires must be connected to the proper ignition coil terminal. Mark spark plug wire locations before removing them.
The accelerator cable bracket nut
The accelerator cable bracket bolt
The accelerator cable bracket and position it aside.
The two ignition coil nuts
The ignition coil stud bolt
The ignition coil
To Install:
Install or connect the following:
The ignition coil
The two ignition coil nuts
The ignition coil stud bolt
Torque to: 71-98 inch-lbs (8-11 Nm)
The accelerator cable bracket
The accelerator cable bracket nut
The accelerator cable bracket bolt
Torque to: 71-98 inch-lbs (8-11 Nm)
The ignition coil electrical connector
The radio capacitor connector


CAUTION
The Spark plug wires must be connected to the proper ignition coil terminal.
Squeeze the locking tabs and connect the six ignition cables.
2001-2003
To Remove:
Before servicing the vehicle refer to the precautions at the beginning of this section.
Remove or disconnect the following:
The ignition coil electrical connector
The spark plug wires, marking for reinstallation
CAUTION
The sparkplug wires must be connected to their correct ignition coil terminal.
The ignition coil
The bolts
Inspect the ignition coil for carbon tracks or damage.
To Install:
Inspect the ignition coil for carbon tracks or damage.
Install or connect the following:
The ignition coil
The bolts
Torque to: 53 inch-lbs (6 Nm)
The ignition coil electrical connector
The spark plug wires, in their original positions
4.6L Engine
1997-1999
To Remove:
NOTE: This procedure is for either RH or LH ignition coil.
Before servicing the vehicle refer to the precautions at the beginning of this section.
Remove or disconnect the following:
The ignition coil electrical connector
The radio capacitor electrical connector
The spark plug wires by squeezing the locking tabs (four each side)
CAUTION
The spark plug wires must be connected to their proper ignition coil terminal. Mark spark plug wire locations.
The bolts
The ignition coil
To Install:
NOTE: The procedure is for either LH or RH ignition coil
Install or connect the following:
The ignition coil
The bolts
Torque to: 44-62 inch-lbs (5-7 Nm)
The ignition coil electrical connector
The radio capacitor electrical connector
The spark plug wires (four each side), into their original positions by squeezing the tabs


CAUTION
The spark plug wires must be connected to their proper ignition coil terminal.

　
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Bottom of Form 1

Check ignition coil, they are known to short circuit after a wash.
Try starting engine at night or in the dark and look around coil and leads for hi voltage sparks.