Code 654

[Heavymetal21192]

I have a 94 bronco 351w with the E4OD. Ran a code reader and popped up with the 654 code. The truck runs well, except for stalling in reverse and 1. And very rarely going up a grade on the highway, it will downshift and the rpms would spike. So before I change out the mlps, I went ahead and shot the pins on the connector. Through all positions, it reads 5.05 volts. with the resistance check for the signal return, In park it's showing just fine, in reverse it's showing about 1650ohms... as well for N,D,2, and 1. I am not really sure where to go from from here. Is that normal if my mlps is bad?

 

[miesk5]

yo HM,

yo D,

WELCOME!

Manual Lever Position Sensor (MLPS) Adjustment Info; "...back-probe the MLP line with a volt meter while in Park, and set it to between 4.277 and 4.736 volts (ideally at 4.5065V, right in the middle of the two limits). As a "double-check" afterward, pull the lever down to 1st gear, and again test the MLP voltage; it should be between 0.293 and 1.167 volts, ideally in the middle at 0.73V..."

Source: by SigEpBlue (Steve) at http://www.fullsizebronco.com/forum/21-noobie-bronco-tech-questions-flame-free-zone/40055-e4od-mlp-adjustment.html

in Same thread see bigric's pic of alignment markings from Steve83; Ric wrote "You don't need a tool. Just put it in neutral, loosen the bolts, and line up the marks"

Read Steve's Post #19 info in same thread;

"You shouldn't be measuring from either wire to ground - measure voltage from one wire to the other... And;

Sensor & Actuator Testing Values ... MLPS measure between Gy/R (SigRet) & LB/Y (TR SIgnal) ... "

http://www.supermotors.net/registry/media/485085

Manual Lever Position Sensor (MLPS) Connector Re-Pining; "...comes with a matching vehicle harness connector. The problem is that you have to remove the pins and their wires from the old vehicle harness connector. What ever you do don't pull all the pins out at the same time because you will never figure out were they go. Easiest thing to do is remove one pin at a time and re-install it into the new connector..."

Source: by miesk5

Manual Lever Position Sensor (MLPS) Installation in a 92

Source: by Jeremy M (Big 92, jermil01) at http://www.fullsizebronco.com/forum/7-1980-96-bronco-tech/123379-mlps-question.html

==

FORD 1994 PCED OBDI-A

SECTION 6A: EEC-IV Pinpoint Test

Procedures

TD: Manual Lever Position (MLP) Sensor

TD: Introduction

TD1 KEY ON ENGINE OFF DIAGNOSTIC TROUBLE CODES (DTCS) 67/634, 522 AND 654:

CHECK MANUAL LEVER POSITION (MLP) SENSOR ALIGNMENT

DTCs 67 and 634 indicate the MLP sensor is out of Self-Test range when the gear selector is in PARK.

DTCs 522 and 654 indicate the gear selector was not in Park during Self-Test.

Possible causes:

Misadjusted linkage.

Open or short in harness circuits.

Damaged MLP sensor.

Damaged PCM.

•Key off.

•Apply parking brake.

•Place transmission in NEUTRAL.

•Verify that Manual Lever Position (MLP) Sensor

READ MORE

But this set of tests includes use of Ford's old break-out Box; so, as I mentioned in another thread here; In place of the breakout box, go to the EEC connector pin instead; Substitute EEC connector pin Number for breakout box number

EEC Connector Pin Diagram

Source: by Fireguy50 (Ryan M) at http://web.archive.org/web/20131229163930/http://oldfuelinjection.com/images/eec04.gif\

EEC Connector Pin LEGEND Bronco & Ford Truck & Van: 4.9, 460, 5.0, 5.8; miesk5 Note, see his Connector Pin Diagram Link above)

Source: by Ryan M (Fireguy50) at http://web.archive.org/web/20131029020805/http://oldfuelinjection.com/truckpinouts.html

Manual Lever Position Sensor (MLPS) Adjustment Info; "...back-probe the MLP line with a volt meter while in Park, and set it to between 4.277 and 4.736 volts (ideally at 4.5065V, right in the middle of the two limits). As a "double-check" afterward, pull the lever down to 1st gear, and again test the MLP voltage; it should be between 0.293 and 1.167 volts, ideally in the middle at 0.73V..."

Source: by SigEpBlue (Steve)

"You shouldn't be measuring from either wire to ground - measure voltage from one wire to the other... And;

Sensor & Actuator Testing Values ... MLPS measure between Gy/R (SigRet) & LB/Y (TR SIgnal) ... "

http://www.supermotors.net/registry/media/485085

Manual Lever Position Sensor (MLPS) Connector Re-Pining; "...comes with a matching vehicle harness connector. The problem is that you have to remove the pins and their wires from the old vehicle harness connector. What ever you do don't pull all the pins out at the same time because you will never figure out were they go. Easiest thing to do is remove one pin at a time and re-install it into the new connector..."

Source: by miesk5

Manual Lever Position Sensor (MLPS) Installation in a 92

Source: by Jeremy M (Big 92, jermil01) http://www.supermotors.net/registry/2896/72098

 

[miesk5]

yo, Had to take a break and left this out;

Manual Lever Position Sensor (MLPS) Testing w/ Resistance Values in 84-96

Source: by Steve http://www.supermotors.net/registry/media/485085_1

Manual Lever Position Sensor (MLPS) pic & Failure Causes; "...Time and usage - Prolonged use in extreme temperatures; If the electronic circuits to and from the sensor and to and from the engine control computer module are malfunctioning..." .

Source: by motorcraft.com

Manual Lever Position Sensor (MLPS) Connector Re-Pining; "...comes with a matching vehicle harness connector. The problem is that you have to remove the pins and their wires from the old vehicle harness connector. What ever you do don't pull all the pins out at the same time because you will never figure out were they go. Easiest thing to do is remove one pin at a time and re-install it into the new connector..."

Source: by miesk5 at Ford Bronco Zone Forums

Manual Lever Position Sensor (MLPS) Water Intrusion TSB 95-2-12 for 89-94

Source: by Ford via miesk5 http://web.archive.org/web/20111118012415/http://home.comcast.net/~miesk5/technical_service_bulletins.htm#technical_service_bulletins.htm