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The Terminator
Engine/Tuning
No pulse on injectors and ignition coils. Help!!
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<blockquote data-quote="MalcolmV8" data-source="post: 15566784" data-attributes="member: 8854"><p>Well that's a little more tricky because the injectors and coils don't go straight to ground. They go directly to the ECU which in turn grounds them when it wants to fire them. So you'd have to verify continuity all the way to the ECU pin and then splice into the wire right at the ECU and check for grounding when cranking the engine over. It will pulse really quick.</p><p></p><p>This is way more work than I'm sure you'd want to do but here's something I did recently and it works fantastic.</p><p></p><p>It's a little jig I made with a stock crank trigger wheel that I just spin with a drill.</p><p></p><p><img src="https://lh3.googleusercontent.com/MPxKeGdHtPX4eB5CbAdyyj_lhQgbFYWSDFjOT_bFNte-8PvMbKLcfoz_5qpbUIUPR8kV5zBOwUPZvcVVxTZUIQedycHdJhD9w03BqiHWBFsC_YXPo3MTUT7bIfwv5pEiIwziSOeROugleMMT9yGCdWwuge9fBERmi_IaDQD7dwnJD2C064KVWwDiQD6Ww-D261fRBqksbNqaG6Onx0VOXjpHN0hicWibqqG2dHjldfQxz9qH8VcWh3OClzdzPRuRm_x7BViNoGz9EYbgDNtXp72gG5iWRUCAIrdybS6x3IFWnVkdohxdNYQtvsjRmFAqF6gwhuF8BHeb7MJLxqW5d5QfK8KfgtWbQJN0FLvVe7lMGKauZQZrYIBzRemS14I2nn6k13f1YqKjCBpE7ku65h_IimRCk6W5NbprutwniS9MvYe9103Vh0N6aSTiMP5_ii4iDjmewYYDAc6z_T5geZkHWxTLP9_6H_xCkMO2VglrZb1B1p3wFkM5holiCbuwHgGR3peQdTryGfvwpNFGw0XkSXInPCD9p6ivnnYJmGZoopjMLwLOzIOIc15CyPfw5bcmIZMEayh6cbj2bNMbbadRbwDj4Bim09Czd_xiR4r9YntEYzbam5mQbiGdlb0IMQYecHCR43nKeBDB8y4pudobO9ybtnPw8hVoP3NYVg=w800-h600-no" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p>You can then scope the crank sensor's output but even better you can feed the signal to the ECU and now its receiving a high RPM crank input, about 3k RPM on my drill. This allowed all the coils and injectors to be firing continuously giving me time to check them.</p><p></p><p>Here you can see a reading of the crank sensor itself. The spikes are the missing tooth.</p><p></p><p><img src="https://lh3.googleusercontent.com/8hsw9Mh_SMqrCTOtj1GSb97sQ4BC14pqWUVcPKM3Ql8Uv-6LKoD71XSHV6ZArPP16SIcgDpVH8g3sQsHJfl_dTjJkhIM_vcBExvofgXtLXCCssAWSz46Sg7stQLxTHEkbN1XKtniAfw0TISqyXVE-mQvJQtptLZ42uS--podQxHjR8LfhdTGGQQlG1Ukf5jgn7HFNVuXXhItwqL9Dgg5-e9o5H06dJ1Os_sHLWWVpNs1MBRf4NWSkZH-7xniz_Jw9b1puJnbGIMyliQKIwM86wxPVKMxgRvoaeb0IkQJZfI06NDMrtvTAygucnjxLJjfmgVWc59BwxiExXRwrqh15WuXrrBV6V0RVGaFvDIEHYU7qzoUNzfVzdtpN2YGUXOIt6mHKC4YSDH6oqBUshTHMD7KUUU6FhQkXsv52s8WKvoOx9QSy8Kan3Swg_9B2-JcFcu6lQzOjxt2cQcJeO5JP8S3dYyMOYnpnVCOMk2wxNSdilX9l0Rani0EajL9eifJPVLLbspzJb5z6in_MFE9eECOjfhPmioD_WujH9K_qNteLLaUoaEXGF_cTpxJdGAfywUdrJEKVSsWMxBm3psowNnEZig-S01j8ey0lCqLH-LV8maB3PH1=w1356-h598-no" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p>You can then also scope the injector and coil grounds and see if they're grounding out. Because if they're not grounding obviously nothing is going to fire even if you have power to them.</p><p></p><p>Turning off PATS in the tune was going to be my next suggestion just in case something is failing there but sounds like you're already on top of that one.</p><p></p><p>If they don't check out I'd go back to looking at your crank sensor. Are you absolutely sure it's working properly? Those pulses are critical. Without them the car will never fire.</p><p>I'd tap into the crank sensor wires right by the ECU, to ensure no breaks in the wiring, and scope it while cranking and verify pulses are getting there.</p><p></p><p>The cam sensor won't stop the car from firing. It just tells the ECU which is TDC so without it the car would just crank longer till the ECU figures out which is compression stroke and fire off the engine.</p></blockquote><p></p>
[QUOTE="MalcolmV8, post: 15566784, member: 8854"] Well that's a little more tricky because the injectors and coils don't go straight to ground. They go directly to the ECU which in turn grounds them when it wants to fire them. So you'd have to verify continuity all the way to the ECU pin and then splice into the wire right at the ECU and check for grounding when cranking the engine over. It will pulse really quick. This is way more work than I'm sure you'd want to do but here's something I did recently and it works fantastic. It's a little jig I made with a stock crank trigger wheel that I just spin with a drill. [IMG]https://lh3.googleusercontent.com/MPxKeGdHtPX4eB5CbAdyyj_lhQgbFYWSDFjOT_bFNte-8PvMbKLcfoz_5qpbUIUPR8kV5zBOwUPZvcVVxTZUIQedycHdJhD9w03BqiHWBFsC_YXPo3MTUT7bIfwv5pEiIwziSOeROugleMMT9yGCdWwuge9fBERmi_IaDQD7dwnJD2C064KVWwDiQD6Ww-D261fRBqksbNqaG6Onx0VOXjpHN0hicWibqqG2dHjldfQxz9qH8VcWh3OClzdzPRuRm_x7BViNoGz9EYbgDNtXp72gG5iWRUCAIrdybS6x3IFWnVkdohxdNYQtvsjRmFAqF6gwhuF8BHeb7MJLxqW5d5QfK8KfgtWbQJN0FLvVe7lMGKauZQZrYIBzRemS14I2nn6k13f1YqKjCBpE7ku65h_IimRCk6W5NbprutwniS9MvYe9103Vh0N6aSTiMP5_ii4iDjmewYYDAc6z_T5geZkHWxTLP9_6H_xCkMO2VglrZb1B1p3wFkM5holiCbuwHgGR3peQdTryGfvwpNFGw0XkSXInPCD9p6ivnnYJmGZoopjMLwLOzIOIc15CyPfw5bcmIZMEayh6cbj2bNMbbadRbwDj4Bim09Czd_xiR4r9YntEYzbam5mQbiGdlb0IMQYecHCR43nKeBDB8y4pudobO9ybtnPw8hVoP3NYVg=w800-h600-no[/IMG] You can then scope the crank sensor's output but even better you can feed the signal to the ECU and now its receiving a high RPM crank input, about 3k RPM on my drill. This allowed all the coils and injectors to be firing continuously giving me time to check them. Here you can see a reading of the crank sensor itself. The spikes are the missing tooth. [IMG]https://lh3.googleusercontent.com/8hsw9Mh_SMqrCTOtj1GSb97sQ4BC14pqWUVcPKM3Ql8Uv-6LKoD71XSHV6ZArPP16SIcgDpVH8g3sQsHJfl_dTjJkhIM_vcBExvofgXtLXCCssAWSz46Sg7stQLxTHEkbN1XKtniAfw0TISqyXVE-mQvJQtptLZ42uS--podQxHjR8LfhdTGGQQlG1Ukf5jgn7HFNVuXXhItwqL9Dgg5-e9o5H06dJ1Os_sHLWWVpNs1MBRf4NWSkZH-7xniz_Jw9b1puJnbGIMyliQKIwM86wxPVKMxgRvoaeb0IkQJZfI06NDMrtvTAygucnjxLJjfmgVWc59BwxiExXRwrqh15WuXrrBV6V0RVGaFvDIEHYU7qzoUNzfVzdtpN2YGUXOIt6mHKC4YSDH6oqBUshTHMD7KUUU6FhQkXsv52s8WKvoOx9QSy8Kan3Swg_9B2-JcFcu6lQzOjxt2cQcJeO5JP8S3dYyMOYnpnVCOMk2wxNSdilX9l0Rani0EajL9eifJPVLLbspzJb5z6in_MFE9eECOjfhPmioD_WujH9K_qNteLLaUoaEXGF_cTpxJdGAfywUdrJEKVSsWMxBm3psowNnEZig-S01j8ey0lCqLH-LV8maB3PH1=w1356-h598-no[/IMG] You can then also scope the injector and coil grounds and see if they're grounding out. Because if they're not grounding obviously nothing is going to fire even if you have power to them. Turning off PATS in the tune was going to be my next suggestion just in case something is failing there but sounds like you're already on top of that one. If they don't check out I'd go back to looking at your crank sensor. Are you absolutely sure it's working properly? Those pulses are critical. Without them the car will never fire. I'd tap into the crank sensor wires right by the ECU, to ensure no breaks in the wiring, and scope it while cranking and verify pulses are getting there. The cam sensor won't stop the car from firing. It just tells the ECU which is TDC so without it the car would just crank longer till the ECU figures out which is compression stroke and fire off the engine. [/QUOTE]
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No pulse on injectors and ignition coils. Help!!
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