What's the odometer reading?
Is there a third party alarm install?
Is there any spark to the plug?
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Test #1
Test the neutral safety switch by pressing on the brake,move gear lever to neutral "N" then start the engine.
Check for excess free play on the linkage.
(moving parts between gear lever to transmission)
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Test #2
Have a helper for view the reverse lights.
Shift the gear lever to reverse and check the reverse lights.
If the light does no come on then the neutral safety switch is bad.
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For vehicle with over 140,000 miles,it's wise to inspect the engine and transmission mounts.
A loose transmission mounts will have more free play and wear out the transmission linkage.
Please do these test and let me know the result on reply.
Check the CAS wiring for short or grounded to metal part.
Recheck for any OBDII code(s).
Can you scanner do live data capture?
Please post the make and model.
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Yes,please check for spark on one cyc.
When you has the key on the ignition,can you hear the fuel pump energize.
The electric fuel pump is a in tank pump.
Position near the fuel tank to listen for the fuel pump.
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It you can not hear the pump to prime then check the fuel pump relay.
Check for burn relay(s)
Re-sit all relays.
Sometime it's necessary to step backward and recreate the problem.
Disconnect the Crank Angle Sensor connect and crack the engine for 8+ second.
The P0340 should be store in the ECU.
Use the reader to pull the code.
reconnect the CAS.
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Mass Air Flow (MAF) sensor (next to air filter hosing) is also easy to access.
Pull the connector,crack the engine and pull the code.
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This is the only method to rule out failing ECU without going to the dealer.
Please post the test result on reply.
Do you has the original window sticker or invoice for your 2003 Jeep?
Look for word like Transponder key and transponder system.
Plain metal only key is not transponder type key......that's mean you do not has this system.
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Did the battery cable got remove for extend period of time.
Did the battery got run down?
Reference only:
Topic: no PCM communication.
http://www.youtube.com/user/realfixesrea...
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Has 95,000 miles. turns over in nuetral but will not start has no reverse lights.
no alarm system how should I check for spark
I just got the coil cover off and checked spark plugs. I tried starting with coil cover off and sounds the same as when it's on so I would guess I'm getting no stark
no shorts and no spark. I have a Actron Pocketscan Plus. When I replaced the camshaft sensor I erased the codes and have no new ones
I can hear the fuel pump start.
yes the fuel pump hums
yes I can hear the fuel pump
didn't work, i pulled both plugs no codes. Thank you for trying to help out
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