92 3.9 no crank, no CEL - Dakota Durango Forum
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post #1 of 23 Old 02-07-2019, 06:06 AM Thread Starter
Tim Keith
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92 3.9 no crank, no CEL

1992 Dakota 3.9 auto stalled while driving, towed it home. Won't crank, no CEL. I replaced the ignition switch with no resolution. Lights on dash instruments work when key is on. Battery is strong.

Before this occurred I had been jumpering the starter relay to start the truck, which is why I thought the ignition switch was the defective.
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post #2 of 23 Old 02-07-2019, 12:34 PM
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If you jump the starter relay, does it now crank? Or not?

If it doesn't, then you've got the wiring to the starter, and the starter itself. Or possibly battery wiring (battery connectors or the connections at the other end of both wires), but a quick test is to turn the headlights on and see how much, if any, they dim when you jump the starter relay.

Check the wiring on the factory service manual, page 8W-44 .

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post #3 of 23 Old 02-07-2019, 06:10 PM Thread Starter
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Isn't the CEL supposed to briefly flash when the key is first turned on? It doesn't do that. That means the ECM isn't getting power.
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post #4 of 23 Old 02-07-2019, 07:59 PM
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Quote:
Originally Posted by Tim Keith View Post
Isn't the CEL supposed to briefly flash when the key is first turned on? It doesn't do that. That means the ECM isn't getting power.
OR that the bulb is burned out.

But it'll crank beautifully with the ECM out ... won't start, but it'll CRANK.

(BTW - Crank == Turns over, Runs <> Cranks, but it has to crank until it can catch and run.)

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post #5 of 23 Old 02-07-2019, 08:10 PM Thread Starter
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I recently read the codes using the CEL.
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post #6 of 23 Old 02-08-2019, 02:08 AM
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Quote:
Originally Posted by Tim Keith View Post
I recently read the codes using the CEL.
And of course that means it could never have burned out since the last time you tried it.

You can try a meter on the proper pins on the OBD1 connector under the hood, see if it bounces when the CEL should be blinking.

Also, it'd be worth it to triple check the fuses both in the PDU and under the dash.

Last but not least, working off the FSM's wiring diagrams, check and make sure you didn't have an ignition switch fail.

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post #7 of 23 Old 02-08-2019, 06:56 AM Thread Starter
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I can hear the fuel pump when I turn the key to the 'on' position.

The truck had died while driving on the highway, hasn't cranked since. The day before I had left the lights on and fully discharged the battery, a tow truck driver gave it a jump start. The only active light on the dash is the oil pressure warning light, and the warning buzzer. I'll diagnose using the FSM.
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post #8 of 23 Old 02-08-2019, 12:41 PM
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Ah.

Step 0 - Charge the battery.

You may be pleasantly surprised - Dodge ECUs are more than slightly twitchy; you may be high enough to run the fuel pump, but not high enough for the ECU to wake up fully.

That would also match the "Won't Crank".

Also, check battery cables, BOTH ENDS, to make sure some oxidation hasn't crept in.

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post #9 of 23 Old 02-14-2019, 12:41 AM
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Try replacing the coil pack. Did the trick with mine.
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post #10 of 23 Old 02-14-2019, 05:49 AM
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Quote:
Originally Posted by Thomasharrell81 View Post
Try replacing the coil pack. Did the trick with mine.
Thing is, a bad coil pack won't keep it from CRANKING. But it'll keep it from RUNNING.

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post #11 of 23 Old 02-14-2019, 07:41 AM
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Hmmm ok. Idle control valve. Throttle postion sensor. Map sensor. Or camshaft postion sensor.
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post #12 of 23 Old 02-24-2019, 07:36 AM Thread Starter
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When I turn the ignition switch to start I can hear the starter relay click.
I replaced the relay with another because sometimes they click, but the
contacts are too worn. Anyway, that would only affect the starter, not
the ignition circuit to the PCM.

Again, the truck stalled driving down the highway. There is no CEL when
the ignition is switched to 'on'. The CEL is supposed to briefly flash once.

Tim
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post #13 of 23 Old 02-24-2019, 10:00 PM
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You know, it's not IMPOSSIBLE that you have two problems.

But with the pair, I would be carefully checking ALL grounds, ALL battery connections (note: There's a connection at the battery, and one at the other end of the cable; check BOTH ends).

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post #14 of 23 Old 02-25-2019, 03:33 AM Thread Starter
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I needed a flasher relay for my Honda, went to Autozone,
decided to get relays for the truck too. I replaced them and
the truck started like it had been parked yesterday. Looks
like there is a dummy slot for a spare relay - I'll get another
relay for that.
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post #15 of 23 Old 03-02-2019, 06:46 AM
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I once had a smog technician rip my tuner out of the obd2 connection during programming and it essentially caused the same issue you describe. I would lean towards ECU issues. Could be faulty ECU connection or corrupted.
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