Beating My Head Against the Wall, Input Needed
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Joined: Dec 2010
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Beating My Head Against the Wall, Input Needed
(98 Neon, DOHC )
Story: Was driving home on the Highway and it started to over heat, pulled over and let it cooldown. Went to grab some water to top off the car and let it cool off some more. Filled up the coolant overflow tank and tried to start it. The car wouldnt start, but it would turn over.
Got it home; Started to read forums and do some research. I have no engine codes.Puledl the plugs and found that i had no spark.
Found this could be from but not limited to;
PCM
Relay (ASD)
Crank Sensor
Cam Sensor
Coil Pack (and assoicated wiring / plugs)
I have replaced all of the above and now have spark on all plugs. But this beast still will not start
I have flopped out relays (Horn) around and verfied each time what relay i plugging in does work with the horn.
I have checked Continuity on the fuses (Toned them out, completing the circuit) just to make sure my eyes are not betraying me and they all test good.
I have pull the Fuel line at the Injector rail and turned it over and watched the fuel gush out.
What am i missing?
I still do not have any error codes and I am at my wits end before i push it out to cub, grab a six pack and light it on fire.
Story: Was driving home on the Highway and it started to over heat, pulled over and let it cooldown. Went to grab some water to top off the car and let it cool off some more. Filled up the coolant overflow tank and tried to start it. The car wouldnt start, but it would turn over.
Got it home; Started to read forums and do some research. I have no engine codes.Puledl the plugs and found that i had no spark.
Found this could be from but not limited to;
PCM
Relay (ASD)
Crank Sensor
Cam Sensor
Coil Pack (and assoicated wiring / plugs)
I have replaced all of the above and now have spark on all plugs. But this beast still will not start
I have flopped out relays (Horn) around and verfied each time what relay i plugging in does work with the horn.
I have checked Continuity on the fuses (Toned them out, completing the circuit) just to make sure my eyes are not betraying me and they all test good.
I have pull the Fuel line at the Injector rail and turned it over and watched the fuel gush out.
What am i missing?
I still do not have any error codes and I am at my wits end before i push it out to cub, grab a six pack and light it on fire.
Record Breaker
Joined: Dec 2006
Posts: 1,216
Likes: 0
From: Baltimore, Maryland
Howdy. You really should check ebay for a factory service manual for your neon. Great tools in times like these.
1997 FSM - Failure To Start Test - 2.0L/2.4L
This no start test check the camshaft position sensor and the crank position sensor.
The powertrain control module (PCM) supplies 8 volts to the camshaft sensor and the crank position sensor through one circuit. If the 8 volts supplied shorts to a ground, neither sensor will produce a signal (output voltage to the PCM).
When the ignition key is turned and left in the On position, the PCM automatically energizes the Auto Shutdown (ASD) relay. However, the controller de-energizes the relay within one second because it has not received a camshaft position sensor signal indicating engine rotation.
During cranking, the ASD relay will not energize until the PCM receives a camshaft position sensor signal. Secondly, the ASD relay remains energized only if the controller senses a camshaft position sensor signal immediately after detecting the camshaft position sensor signal.
(1) Check battery voltage. Voltage should be approximately 12.66 volts or higher to perform failure to start test.
(2) Disconnect the harness connector from the coil pack
(3)Connect a test light to the +B (battery voltage) terminal of the coil electrical connector and ground. The +B wire for the DIS coil is the center terminal. Do not spread the terminal with the test light probe.
(4) Turn the ignition key to the ON position. The test light should flash On and then Off. Do not turn the Key to off, leave it in the On position.
(a) If the test light flashes momentarily, the PCM grounded the ASD relay. Proceed to step 5.
(b) If the test light did not flash, the ASD relay did not energize. The cause is either the relay or one of the relay circuits. Use the DRB scan tool to test the ASD relay and circuits. Refer to the appropriate Powertrain Diagnostics Manual. Refer to the wiring diagrams section for circuit information.
(5) Crank the engine. (If the key was placed in the off position after step 4, place the key in the On position before cranking. Wait for the test light to flash once, then crank the engine.)
(6)If the test light flashes momentarily during cranking, the PCM is not receiving a crankshaft sensor signal.
(7) If the test light did not flash during cranking, unplug the crankshaft position sensor connector. Turn the ignition key to the off position. Turn the key to the On position, wait for the test light to momentarily flash once, then crank the engine. If the test light momentarily flashes, the crankshaft position is shorted and must be replaced. If the light did not flash, the cause of the no-start is either in the crankshaft position sensor/camshaft position sensor 8 volts supply circuits, or the camshaft position sensor output or ground circuits.
If this yields no help. Try your pcm in a friends' neon to see if it works.
1997 FSM - Failure To Start Test - 2.0L/2.4L
This no start test check the camshaft position sensor and the crank position sensor.
The powertrain control module (PCM) supplies 8 volts to the camshaft sensor and the crank position sensor through one circuit. If the 8 volts supplied shorts to a ground, neither sensor will produce a signal (output voltage to the PCM).
When the ignition key is turned and left in the On position, the PCM automatically energizes the Auto Shutdown (ASD) relay. However, the controller de-energizes the relay within one second because it has not received a camshaft position sensor signal indicating engine rotation.
During cranking, the ASD relay will not energize until the PCM receives a camshaft position sensor signal. Secondly, the ASD relay remains energized only if the controller senses a camshaft position sensor signal immediately after detecting the camshaft position sensor signal.
(1) Check battery voltage. Voltage should be approximately 12.66 volts or higher to perform failure to start test.
(2) Disconnect the harness connector from the coil pack
(3)Connect a test light to the +B (battery voltage) terminal of the coil electrical connector and ground. The +B wire for the DIS coil is the center terminal. Do not spread the terminal with the test light probe.
(4) Turn the ignition key to the ON position. The test light should flash On and then Off. Do not turn the Key to off, leave it in the On position.
(a) If the test light flashes momentarily, the PCM grounded the ASD relay. Proceed to step 5.
(b) If the test light did not flash, the ASD relay did not energize. The cause is either the relay or one of the relay circuits. Use the DRB scan tool to test the ASD relay and circuits. Refer to the appropriate Powertrain Diagnostics Manual. Refer to the wiring diagrams section for circuit information.
(5) Crank the engine. (If the key was placed in the off position after step 4, place the key in the On position before cranking. Wait for the test light to flash once, then crank the engine.)
(6)If the test light flashes momentarily during cranking, the PCM is not receiving a crankshaft sensor signal.
(7) If the test light did not flash during cranking, unplug the crankshaft position sensor connector. Turn the ignition key to the off position. Turn the key to the On position, wait for the test light to momentarily flash once, then crank the engine. If the test light momentarily flashes, the crankshaft position is shorted and must be replaced. If the light did not flash, the cause of the no-start is either in the crankshaft position sensor/camshaft position sensor 8 volts supply circuits, or the camshaft position sensor output or ground circuits.
If this yields no help. Try your pcm in a friends' neon to see if it works.
