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2G 420A Fuel Pump/Relay issue

Dschultz8051

Probationary Member
5
0
Mar 25, 2020
Greenwood, Indiana
98 Eclipse RS

When I turn the key on, the relays click, no power to fuel pump, and the tach reads 1000 without hitting ignition. When I do hit ignition it just turns over with no start.

Occasionally it will do what it is supposed to and fire up for about 10-20 second before it does the above again.

Where do I start?
 

dustyboner

DSM Wiseman
1,362
618
Mar 13, 2016
abq, New_Mexico
you probably have an issue with the crank and or cam sensor.


The Powertrain Control Module (PCM) supplies 8 volts to the camshaft position sensor and crankshaft
position sensor through one circuit. If the 8 volt supply circuit shorts to 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 crankshaft position
sensor signal immediately after detecting the camshaft position sensor signal.

(1) Check battery voltage. Voltage should 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 position, 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.

(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 momentarily flashes during
cranking, the PCM is not receiving a crankshaft position
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
sensor is shorted and must be replaced. If the
light did not flash, the cause of the no-start is in
either the crankshaft position sensor/camshaft position
sensor 8 volt supply circuit, or the camshaft
position sensor output or ground circuits.
 
Last edited:

Dschultz8051

Probationary Member
5
0
Mar 25, 2020
Greenwood, Indiana
you probably have an issue with the crank and or cam sensor.


The Powertrain Control Module (PCM) supplies 8 volts to the camshaft position sensor and crankshaft
position sensor through one circuit. If the 8 volt supply circuit shorts to 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 crankshaft position
sensor signal immediately after detecting the camshaft position sensor signal.

(1) Check battery voltage. Voltage should 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 position, 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.

(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 momentarily flashes during
cranking, the PCM is not receiving a crankshaft position
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
sensor is shorted and must be replaced. If the
light did not flash, the cause of the no-start is in
either the crankshaft position sensor/camshaft position
sensor 8 volt supply circuit, or the camshaft
position sensor output or ground circuits.
Ok I will try this and see how it goes.
 

Dschultz8051

Probationary Member
5
0
Mar 25, 2020
Greenwood, Indiana
you probably have an issue with the crank and or cam sensor.


The Powertrain Control Module (PCM) supplies 8 volts to the camshaft position sensor and crankshaft
position sensor through one circuit. If the 8 volt supply circuit shorts to 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 crankshaft position
sensor signal immediately after detecting the camshaft position sensor signal.

(1) Check battery voltage. Voltage should 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 position, 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.

(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 momentarily flashes during
cranking, the PCM is not receiving a crankshaft position
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
sensor is shorted and must be replaced. If the
light did not flash, the cause of the no-start is in
either the crankshaft position sensor/camshaft position
sensor 8 volt supply circuit, or the camshaft
position sensor output or ground circuits.
The light did not flash when I tested the center terminal.
 

dustyboner

DSM Wiseman
1,362
618
Mar 13, 2016
abq, New_Mexico
well the fuel pump relay will only activate for 1 second if the PCM doesn't get a signal from the crank sensor that indicates the engine is rotating.

Check that the EGR tube (metal tube from the EGR valve to the back of the intake manifold) hasn't melted any of your wiring harness. If the harness is good, its most likely the crank sensor.

id recommend one of these 2 sources for a replacement sensor:
genuine mopar crank sensor
or for half the price
high quality sensor made in the U.S.A.
 

Dschultz8051

Probationary Member
5
0
Mar 25, 2020
Greenwood, Indiana
Was checking the wires and found this little gem. I am assuming that this is the ASD relay. I’m learning as I go here, but, I don’t think that this is supposed to be wired like that.

50632C1D-DF87-4892-805B-69A14AE31209.jpeg
 
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