My car won't start... wait a minute and I haven't got any spark... Bummer.

"The lack of spark", well this is probably the most common no start condition found today. Ignition components go through a lot of wear and tear, so naturally these components are a huge source of trouble. Find the scoop for a no spark condition, right here ...

 

THEORY OF OPERATION

The following procedures should be used to diagnose a no start-no spark condition. First the no start-no spark condition must be verified as the specific problem affecting the vehicle. A no spark and no injector pulse condition should be considered an entirely different problem, therefore, an entirely different strategy must be followed. Always verify the customer’s complaint first to ascertain the vehicle’s failure.

1. Perform a visual inspection. The importance of a visual inspection can not be overstated. Scan the vehicle for codes paying particular attention to CAM & CRK related codes. At this point in time the no spark condition could be either primary or secondary ignition related.

2. Check the secondary side of the circuit by using an ST-125 or a neon noid light. Using a screwdriver attached to the end of an ignition wire, verify that the spark can jump approximately a 1 inch gap. Perform the noid-light and screwdriver test working your way up to the coil.

3. Check the module’s ignition ground. Always crank the engine while doing any type of ground voltage drop test. By cranking the engine, the starting system is stressed to its maximum, making any ground resistance evident.

4. Check ignition power ( Battery ) feed. It is possible to have a B+ power side problem causing the no spark condition. An ignition coil relay, wiring to the coil/module or ignition switch could the culprit in some cases.

5. Check the primary side of the ignition circuit using an oscilloscope. Synch the signal to cylinder # 1 and set channel 1 to the primary coil (coil circuit) output and channel 2 to a low current amp-probe hooked around the power side of the coil. Voltage alone will not reveal the whole picture. By also getting a current waveform, it is possible to know exactly what is happening in the circuit.

NOTE: Be sure to verify that the spark can jump a 1 inch gap. Defective coils can light up a neon noid-light and cover up the problem. Always trace the spark all the way to the coil. A defective coil wire or rotor can cause a no start-no spark condition.

 

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Actuators               Fuel-Injectors            Ignition-Coil           Leak-Detection Pump  GM-Series Alternator   Idle-Control Valve      EGR-System            EVAP-System      

Repair Strategies Current-Ramping      Lack of Power           Fuel-Flow Volume     Ignition Waveform       Ignition Testing          A/F Ratio Diagnosis    Minimum Air Rate      No Fuel-Pressure       No Injector Pulse      No-Start/No-Spark     General No-Start      

ECM/PCM Modes Cranking Enrichment   Warm-up Cycle         Open-Loop            Closed-Loop            Accel. Enrichment Deceleration Leaning   Idle Control             Low-Voltage Correction Clear Flood Mode     Selective Inj. Cut-Off   Limp-In Mode           Exhaust Variable Valve

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 Code Setting Criteria

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SRS Airbag DTC

GM SRS Airbag Code   GM Truck SRS Code    Ford SRS Airbag Code  Ford Truck SRS Code   Dodge SRS Code        Dodge Truck SRS Code Acura/Honda SRS Code Isuzu SRS Codes         Mazda SRS Codes        Subaru SRS Codes Infinity/Nissan SRS       Kia SRS Codes     Hyundai SRS Codes     Mitsubishi SRS Codes Lexus/Toyota SRS

How to Get SRS Codes

Retrieving Dodge SRS   Retrieving Ford SRS     Retrieving GM SRS      Retrieving Honda SRS   Hyundai/Kia/Mitsu SRS Isuzu/Mazda/Subaru     Retrieving Toyota SRS  Nissan/Infinity SRS

SRS-Airbag Repair Guide

Deleting SRS Codes   Dodge SRS Location       Dodge SRS Operation     Ford SRS Location          Ford SRS Operation        GM SRS Location            GM SRS Operation           Honda SRS Location       Honda SRS Operation     Isuzu/Mazda/Suba Loc.   Isuzu/Mazda/Suba Ope Kia/Hyun/Mitsu Location Kia/Hyun/Mitsu Oper.       Nissan/Infinity Location   Nissan/Infinity Operation Toyota/Lexus Location    Toyota/Lexus Operation 

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