Question about Chevrolet Tahoe

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12 volts at terminal A and D of the ICM plug. Has good ground and on ICM plug and led flashes when cranked when connected to whatever terminal it is on the ICM plug.

1997 Tahoe crank no spark. replaced coil & icm. 12 volts to coil plug and signal to other wire in plug when cranked. p1351 code

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Posted on Jan 02, 2017


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I have no spark on my 1999 chrysler sebring convertable

You will need at least a 12 volt test light to check the cam and crankshaft sensors. If either one is bad, the auto shut down relay will not ground the PCM. Remove the 4 pin electrical connector from the coil. one of the terminals is a 5 volt feed. Connect the light to that terminal and clip the other to ground. Turn the key to the on position. the light should flash once. If it does not flash the problem is in the ASD relay or its circuit. If it flashes once, try to start the engine. (don't worry, it can't start.) See if the light flashes during cranking or not. If not, return the key to off and then disconnect the crank sensor wire connector and try again. If it flashes as you crank the engine now, then the crank sensor is bad. If it does not flash during cranking then the cam sensor is probably bad. They are both easy to access and replace. The PCM could also be bad, but the cam/crank sensors are a more common problem. A repair manual is a cheap investment and could be helpful. Good luck.

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Hello. I have a 1989 Nissan Pickup truck. It has 6 cylindars. It died recengtly while I was driving. I put fuel in as I though I had run out of gas. It started again and made it home. the next day it...

Could be the crankshaft sensor, wiring, or the coil/ignition module. Che k to see if there is power on the black/white coil wire when the key is turned to statt. If not, you have a loose wire from the ignition. If power is there, test the crank sensor.
Your crank sensor is in the distributer. Here is a test for it:

Diagnosis and Testing

For further Diagnosis and Testing of the Engine Concentrated Control System (ECCS) refer to Chapter 4 or 5 in this guide. Additional distributor and ignition coil information can be found in Chapter 3 of this guide.
CRANK ANGLE SENSOR When the ignition is ON and the main ECCS relay is activated, 12 volts is sent to the crank angle sensor LED. When a slit uncovers the photo diode and it detects the light, a 5 volt signal is sent to the ECU. The unit is easy to test but it must be removed from the engine. Refer to to test procedure below.
  1. First test the circuit to the sensor. Unplug the sensor connector, turn the ignition ON and check for 12 volts between one of the terminals and ground. The other terminals are return signals to the ECU, do not use them for voltmeter ground.
  2. Turn the ignition OFF , remove the distributor assembly and reconnect the plug to the crank angle sensor. Peel back the insulation sufficiently to connect a voltmeter to the wires. Ground the coil high tension wire.
  3. With the voltmeter connected to a good chassis ground, turn the ignitionON and slowly rotate the distributor. One of the return signal wires should have 5 volts off and on with each degree of rotation. The other should have 5 volts off and on with each 180 degrees (4 cyl.) or 120 degrees (6 cyl.) of rotation.
  4. Visually check the rotor plate for rust or damage.

If the sensor tests good, replace the coil.

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P0386 Crank position sensor "B" circuit range./performance. This is about performance.Is the sensor secured?How about sensor/rotor.The wiring? How about the air gap. Here is how the wiring works On cranksensor B you have three wire a yellow and a yellow and a light green. one of the yellow wire is ground,the other yellow ire is signal, the light green wire is 12 vlots or ignition voltage.when the key is on this is 12 volts.The 12 volts to the cranksensor is from the PCM and NOT the ICM3_20_2012_7_31_33_am.jpg

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You are at thhe right trail what controls spark is coil pack crank sensor sparkplugs and plug wire but the most important is power . I mean 12 volt connections and ground This includes checking fuses you need a simple volt meter doesnt have to expensive or fancy just to pick up 12 volts let start with fuses in the engine juction box (there not mark to what it belongs to) make sure none are open. especially fuse 19 and 24 , next go to the crank sensor make sure the tabs are snuggly on now to the coil pack there is a red and light green wire this comes from ignition and feeds 12 volts at the coil pack measure that voltage is it 12 volts if not correct it this is from ignition switch ( you can make a tool that feed 12 volt with a wire and a fuse in series and attatch it to battery and the primary wire this is known as hot wire) next go to the ECM wiggle the wires see if that get a connection going if not go back to the ICM here are the wire you are to measure the tan light green, this is from ECM and it is pulsed it measure 5vlts to 0 volts switched then measure the tan orange the same thing 5 volts to zero,then tan white again 5vlts to zero. any one of these 5 to zero fails you fix is the ecm

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Hi, my BMW 318E46 won't start, it just clicks twice. We're getting over 12V from the battery and lights, radio etc so don't think its that. Maybe the solenoid switch, any other ideas? We want to check the...

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While cranking, the starter draws from ~120-200 amperes of current and any even mildly corroded connection in the path will drop all of the voltage. 0.1 Ohms of resistance will drop nearly all of 12 volts when trying to start.
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