Starting problem

Tiny
ASEMASTER6371
  • EXPERT
Again, are we talking about the same truck?

Did you clear the codes since the last information? The picture said 1 of 8?

Roy
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Monday, September 30th, 2019 AT 2:18 AM
Tiny
RONALDHEADRICK
  • MEMBER
Yes, it is plugged into a 2003 Chevrolet Astro van. The pages start at the top left and read normally left to right.
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Monday, September 30th, 2019 AT 7:59 AM
Tiny
ASEMASTER6371
  • EXPERT
Okay, I found some information on the code. The information is below and the flow chart is attached for the code.

Roy

CIRCUIT DESCRIPTION
The enhanced ignition system uses the crankshaft position (CKP) sensor to provide a timing input to the control module. Ignition control (IC) spark timing for each cylinder is based on this input. The control module provides the ignition timing signal to the ignition control module (ICM) to control the ignition coil. Each timing pulse detected by the ICM allows the ICM to energize the ignition coil. A large secondary ignition voltage is induced in the secondary coil winding by the primary coil winding. This high voltage is switched to the correct spark plug by the distributor. If the power-train control module (PCM) detects an unusually high or low voltage on the ignition signal circuit, DTC P0351 sets.

CONDITIONS FOR RUNNING THE DTC
The engine is cranking.

CONDITIONS FOR SETTING THE DTC
The ignition control voltage is not between 0.04-4.9 volts.

ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
- The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.
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Monday, September 30th, 2019 AT 12:38 PM
Tiny
RONALDHEADRICK
  • MEMBER
On the first picture in box 3 it refers to a DMM. Does that mean digital multi meter if not what is a DMM? Am I understanding that a crankshaft positioning sensor and or a throttle positioning sensor can cause the problem I am having with the van not staying running?
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Saturday, October 5th, 2019 AT 5:14 PM
Tiny
ASEMASTER6371
  • EXPERT
Yes, DMM is a digital volt meter.

Possible with the crank sensor but no to the TPS.

Roy
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Sunday, October 6th, 2019 AT 5:03 AM
Tiny
RONALDHEADRICK
  • MEMBER
Would the computer throw a code if the injectors faulted or are not working properly? If not could the injectors be the problem?
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Sunday, October 6th, 2019 AT 2:06 PM
Tiny
RONALDHEADRICK
  • MEMBER
I checked everything on the last bit of information you sent me and everything was like it should be. If I was able to understand what you sent me properly. It's all good.
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Sunday, October 6th, 2019 AT 2:09 PM
Tiny
ASEMASTER6371
  • EXPERT
If you followed the flow chart and had no conclusion for the failure, you missed something.

If the injectors were an issue, they would code.

Roy
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Sunday, October 6th, 2019 AT 2:16 PM
Tiny
RONALDHEADRICK
  • MEMBER
Okay, I will try again. I must not be understanding the flow chart all the way. Is there anyway you can translate the chart into dummy terms more less?
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Sunday, October 6th, 2019 AT 4:02 PM
Tiny
RONALDHEADRICK
  • MEMBER
Is PCM referring to the power-train control module?
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Sunday, October 6th, 2019 AT 4:17 PM
Tiny
ASEMASTER6371
  • EXPERT
Tell me where you were confused.

Roy
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Sunday, October 6th, 2019 AT 4:19 PM
Tiny
RONALDHEADRICK
  • MEMBER
12 repair the short to ground in the ic timing control circuit and then does 11 mean repair the ground from battery to chassis or from the engine block to chassis or is it somewhere else?
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Sunday, October 6th, 2019 AT 4:47 PM
Tiny
RONALDHEADRICK
  • MEMBER
Here are a few other steps on the flowchart that I have trouble understanding:

Probe the ignition 1 voltage Circuit of the ICM harness connector.

Test for an open in the IC timing control circuit between the PCM and ICM is the timing control circuit the wire that pulsates when you crank the motor.

What does the flow chart mean when it says go to intermittent?
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Monday, October 7th, 2019 AT 4:51 AM
Tiny
ASEMASTER6371
  • EXPERT
The purple wire on the connector for the module. You back probe it when cranking with q test light and see if it is flashing. That will tell you if the module is working.

Roy
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Monday, October 7th, 2019 AT 7:13 AM
Tiny
RONALDHEADRICK
  • MEMBER
On my ignition control harness that you said back probe the purple wire I have red, black, white, white with black stripe.
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Monday, October 7th, 2019 AT 8:01 AM
Tiny
ASEMASTER6371
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Okay, even easier. Go to the negative side of the coil. Set your test light on that terminal. Crank the engine and see if the light flashes. That will tell you if the module is working.

Roy
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Monday, October 7th, 2019 AT 8:04 AM
Tiny
RONALDHEADRICK
  • MEMBER
The answer to your question, yes my my light flashes while cranking the engine. I started the flowchart over again one two and three are all yes and the voltage going into the control module from the white wire is 2.41 AC volts while you're cranking the engine here is what the scanner showed after disconnecting the injector and cranking and for 15 seconds
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Monday, October 7th, 2019 AT 9:01 AM
Tiny
ASEMASTER6371
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Okay, 2 and 3 are good.

Go to 4 and do the test with the test light.

Roy
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Monday, October 7th, 2019 AT 9:04 AM
Tiny
RONALDHEADRICK
  • MEMBER
I noticed that a ground could be a problem. Would it help if I ran a new ground from the engine block to chassis and from battery to chassis and body to chassis?
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Monday, October 7th, 2019 AT 9:10 AM
Tiny
ASEMASTER6371
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Did you do the check? You need to do the check.

Roy
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Monday, October 7th, 2019 AT 9:12 AM

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