Where is the pcm or obm fuse located? - 1996 Dodge Dakota

What do you think a EEC relay is ?
Electronic
Engine
Control

It is the relay that sends power to the PCM (computer). Try swapping the relay with another one in the fuse box and go from there.

But on your vehicle it's not called that , it's PCM power relay . It's located in the under hood fuse / relay box .


right side big square ,second row down. PCM power relay .

location - under hood fuse / relay box. PCM 1 fuse 15 amp , PCM B fuse 20 amp. Plus instrument panel fuse block , IGN O fuse 10 amp . Fuse Block - I/P
At the left side of the I/P behind the access panel

two fuses one on instrument panel fuse box the other on engine comparment fuse box

you need to drive it about a week of normal driving or two days of driving as close to 50mph for 10 miles straight

this fuse is located in the engine compartment fuse box and will be labeled ecm, i would check all the fuses, as far as a fuse inside the pcm there is not one,

Hi, if you have the 4-cylinder, only the PCM and the ignition is on this fuse. If you have the V-6, the camshaft and crankshaft sensors are also on it. What I recommend is to disconnect everything on the fuse except the PCM, and then turn the key on. If the fuse blows, you know your PCM is shorted. If it doesn't blow, reconnect the ignition module and turn the key on again. If the fuse blows, you know the ignition is bad. If not, plug in the sensors one at a time to see which one is shorted. The location of the sensors are shown below, but there are 2 possible locations for the crankshaft sensor. The ignition module is under the coil pack. Please let me know if you have any questions, and thanks for using FixYa.









Ignition module

DTC P1166: A/F Sensor (Sensor 1) Heater Circuit Malfunction

1. Reset the ECM/PCM.
2. Start the engine.

Is DTC P1166 indicated?

YES - Go to step 3.

NO - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at C101 (located under the right side of the dash), C401 (located under the left side of the dash), C402 (located under under the left side of the dash) the A/F Sensor relay, the A/F Sensor (Sensor 1) and the ECM/PCM.

1. Check the following fuse:

• No.14 OPTION (30A) fuse in under-hood fuse/relay box.
• No.2+B LAF HEATER (20A) fuse in under-dash fuse/relay box.
• No. 4ACG (10A) in under-dash fuse/relay box.

Are any of the fuses blown?

YES - Repair short in the wire between the A/F Sensor relay and the fuses.

NO - Go to step 4.

1. Measure voltage between ECM/PCM connector terminals A1 and A24, 30 seconds after the ignition switch is turned ON (II).

Is there battery voltage?

YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.

NO - Go to step 5.

1. Measure voltage between ECM/PCM connector terminals A22 and A24.

Is there battery voltage?

YES - Go to step 6.

NO - Go to step 10.

1. Turn the ignition switch OFF.
2. Disconnect ECM/PCM connector E (31P).
3. Turn the ignition switch ON (II).

1. Connect ECM/PCM connector terminal E8 to body ground with a jumper wire, then measure voltage between ECM/PCM connector terminals A1 and A24.

Is there battery voltage?

YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.

NO - Repair open or short in the wire between the A/F Sensor (Sensor 1) and ECM/PCM (A1).

1. Turn the ignition switch OFF.
2. Disconnect the ECM/PCM connector A (31P) and the A/F Sensor (Sensor 1) 4P connector.

1. Check for continuity between the A/F Sensor (Sensor 1) 4P connector terminal No.3 and body ground.

Is there continuity?

YES - Repair short in the wire between the A/F Sensor relay, A/F Sensor (Sensor 1) and ECM/PCM (A22).

NO - Go to step 13.

1. Turn the ignition switch ON (II).

1. Measure voltage between ECM/PCM connector terminals E8 and A24.

Is there battery voltage?

YES - Repair open in the wire between the ECM/PCM (A22) and the A/F Sensor (Sensor 1).

NO - Go to step 15.

1. Check for continuity in the wires between the A/F Sensor and the fuses.

Is there continuity?

YES - The wires are OK. Replace the A/F Sensor relay.

NO Repair open in the wire between the A/F Sensor relay and the fuses.

The pcm is located on the drivers side in behind the fuse/relay panel against the fenderwell. You will have to remove the screws holding the fuse/relay panel, and move it out of the way to get to the pcm if you decide to remove it. Make sure to disconnect the negative cable from the battery first before you do any type of work. Also make sure to ground yourself to the van body before you handle it. Without doing this will damage the pcm, (static electricity). hope this will help you.

It should be in the under hood fuse box with a PCM protection diode and PCM relay. Is your truck light duty, super duty, gas or diesel?