J.P. Instruments EDM 700 800 Archives

We have button extensions available. Size: 7/16″ long. Be sure the hole through the panel is large enough so that the buttons do not bind. Contact JPI at: 800-345-4574

EDM-700 Pin assignments
yel 1, red 2, OIL
yel 3, red 4, IAT

yel 5, red 6, CARB (or CDT **Note: will not display CDT unless IAT probe also installed.)
yel 14, red 15, OAT
yel 16, red 17, TIT
yel 18, red 19, TIT-2 (2nd TIT)
gry 12, Remote alarm
red 13, + Power(+14/28 v 5 A resettable circuit breaker)
wht 24 , RS-232 data port
blk 25, Engine ground

To add Oil Pressure to your existing EDM-700 or 800, you must have these two things:

#1) The 9-pin middle connector on the back of the EDM between the top and bottom 25 pin connectors.

#2) The EDM must also have updated software that has ‘OIL P? N’ in the FAC LIM list. Even if your EDM does have this middle connector, please follow the five steps below to see if your EDM has the upgraded software. (If you do not see ‘OIL P? N’ in the Factory Limits list, then the EDM will need to come into JPI for an Oil Pressure software upgrade.)

If you need to add wire for Oil pressure to an already installed RPM/MP harness on the EDM-700/800, you will need to pin the black and white wires that come with the Oil Pressure sensor (p/n #306018) to the middle EDM 9-pin connector – pins#6 and #7. [Designated P3 in the EDM install manual Rpt #103. In this manual pins 6 & 7 of the P3 connector are labeled ‘SPARE’.] This DB-9 black connector opens like a clam shell and you will pin it:

White wire – pin# 6

Black wire – pin# 7

After installing the Oil pressure sensor, you will need to go into FAC LIM of the EDM to change ‘OIL P? N’ to ‘Y’ for yes. To do this, follow the five steps below:

1) Turn on EDM. After the self test, tap the ‘Step’ button to get past the ‘FILL? N” prompt. (If your EDM has fuel flow.)

2) Now press both buttons down for until you see ‘PROGRAM’ and then take your fingers off.

3) Now you will see ‘FUEL? N’. (If your EDM has fuel flow, otherwise you will see ‘RATE’) Tap the ‘Step’ button until you see ‘END Y’. Now hold both buttons down again until you see ‘FAC LIM’. Then take your fingers off.

4) Now you will see ‘FAC? N’. Now tap the ‘Step’ button until you see ‘OIL P? N’. Now tap the LF button on the left to change the ‘N’ to a ‘Y’.

5) Now tap the ‘Step’ button until you see ‘END Y’. Now tap the ‘Step’ button one more time to get out of FAC LIM mode completely. You can now power off the EDM.

Mount the Oil pressure sensor using an aluminum clamp MS21919. (Not included.) Mount to firewall. Mount the pressure sensor to the pressure line using a flexible hose and fittings. Do not mount sensor directly to the engine. Connect the other end of the hose to the engine manufactures recommended location for engine oil pressure.

After install, you will see ‘O – P’ on digital part of display.

1. Go to pilot program mode (Hold both buttons to see PROGRAM).
2.Tap STEP until you see DUMP? N.
3. Hold both buttons until you see RCRD TIME 6. Tap the LF to change recording rate.
4. Tap STEP and you will see MNTH. Use the LF button to change.
5. Tap STEP to set DAY, LF to change.
6. Repeat for YEAR, HOUR, MIN.
7. Tap STEP and see aircraft N number, or EDM serial number.
8. To change or add N number, hold both buttons until the first character flashes, use LF to change. Tap STEP to move to the next character. LF to change. To exit, hold both buttons down until you see END Y.
9. Tap STEP to exit.

** If your EDM is 5+ years old, and while doing the above you see the word “FAST? N”, change the “N” to “Y” for yes. This will change your EDM’s buad rate to 19,200. This is needed with the newer downloading software – EzTrends.

If the columns are missing during self test then return for repair.[support@jpitech.com for RMA number]

Otherwise:

Swap the ‘faulty’ probes wire to the next cylinders ‘good’ probe. Now since that ‘good’ probes wire is now off, fasten it to the ‘faulty’ probe. You just swap the wire, not the probes. Now turn on the EDM and get up to operating temperature. Does the other ‘good’ EDM cylinder channel now behave in the same way? Then it’s the probe. If not and the original ‘faulty’ cylinder is still behaving in the same way, (no change)- then it could be a bad crimp or connection or instrument is faulty.
Check that the EDM is grounded at the engine (not in the instrument panel).
Check for a bent or recessed pin on the rear P2 connector.
Check crimps between probe and harness.
Check that leads are not shorted together on the harness or where the probes connect to the harness.

Make sure power and ground connections are good and you see at least 12V. If you do, then return for repair. Go to https://www.jpinstruments.com/jpirma/ for a RMA number before sending in the EDM for repair

If there is a light in each upper corner then the CPU has failed – return for repair.
If no light, then the display is cracked – return for repair. Visit: https://www.jpinstruments.com/jpirma/ for a RMA number before sending it in.

Check RPM sensor if applicable – if shorted together will kill EDM display.

Check for tripped circuit breaker or fuse.
Verify power is reaching the EDM through the P1 connector on the rear of the instrument – must be above 11.5v.
Display glass cracked do to not following install instructions- $150.00 to replace display.
Otherwise, return for repair: https://www.jpinstruments.com/jpirma/ for a RMA number before sending in the EDM.

Press each button. Does each button depress with a definite click feel?
If one or both buttons do not have a click feel, then a button may be binding on the instrument panel. Loosen the four mounting screws and reposition the instrument slightly.
Power down and up and do factory reset. If that doesn’t remedy the problem, return for repair. https://www.jpinstruments.com/jpirma/ for a RMA number before sending in for repair.

Make sure nothing installed in P1 connector for those Options.
Check that P2 connector is attached to the EDM.
Perform factory limit reset (FAC LIM; FAC? Y). [ Flight data and K factor wil be lost.]

TSO’d EDMs can replace non-primary factory gauges – IF – it is not a required instrument per the POH and does not have redline.

STC’d ‘Primary’ EDM’s – EDM-711 can replace the CHT, OIL, and TIT factory guages on specified aircraft. The EDM-900/930’s can replace all factory gauges for the specified aircraft.

See: http://jpitech.com/pilotguide.php4 for our current EDM900/930 STC approved model list.

6-32 X 0.15″ (3/16″)screws. Screws must not penetrate the bezel more than 1/8″ or .120″ ( 3mm ) — on the EDM-700/800/760.

** Note: Longer screws may damage plasma display – this is not covered under warranty

You must tap LF then tap STEP & LF together quickly.

Be sure the light return lead is connected to a positive power source (through a circuit breaker or fuse), and not to ground.
Alarm light signal is an open collector(sinks to ground) capable of sinking 150 ma. Connect one side of the light to +V (protected by fuse or CB) and the other to the alarm light wire. May be paralleled with other similar operating alarm signals.

Check power, ground, and rear connectors. Visit: https://www.jpinstruments.com/jpirma/ for a RMA number before sending in the EDM.

Unit has CDT & IAT probes and will read CDT – IAT differential

All EDMs have internal capacitors that attempt to provide power during short drops in bus voltage. Check ground and power lead points of contact for potential problems. The EDM needs around 11+V to stay alive. If the voltage drops to that level it will reset.

EDM is still in the demo mode. Must do a FAC LIM reset.

At sea level – 70F ambient air temp, at 10 ft. down the runway at full throttle the horsepower would be at 100%. Adjust the EDM accordingly.

Engine ground only – the same ground that the EGT probes are using – which is engine ground. Have them attach the black ground wire directly to the engine case. NOT panel ground, battery ground or airframe ground. These can vary from engine ground by 1/4v.This small voltage is can cause issues such as all EGT or CHT readings seem High, or Low, or Unsteady(erratic).

The EDM-700/800 have automatic dimming – no way to adjust. Visit:https://www.jpinstruments.com/jpirma/ for a RMA number and shipping instructions before sending in the EDM for repair.

Check that if a bayonet or threaded adapter probe is installed, that it is screwed in tightly and the threads are clean in order to ground the factory probe. If adapter is not grounded well to engine, voltage will be applied to the adapter thermocouple junction and disrupt the EDM instrument.

• Check crimps between probe and harness.

• Check connection on the rear P2 connector.

• Swap the ‘faulty’ probes wire to the next cylinders ‘good’ probe. Now since that ‘good’ probes wire is now off, fasten it to the ‘faulty’ probe. You just swap the wire, not the probes. Now turn on the EDM and get up to operating temperature. Does the other ‘good’ EDM cylinder channel now behave in the same way – erratic? Then it’s the probe. If not and the original ‘faulty’ cylinder is still behaving in the same way, (no change)- then it could be a bad crimp or connection or instrument is faulty.

• Check that the EDM is grounded at the engine case(not in the instrument panel). Do not use panel ground, battery ground, or airframe ground. Airframe ground can vary from engine ground by 1/4v. This could cause the EDM to show too ‘High’ or ‘Low’, EGT, CHT temps. Or show ‘Unsteady’ readings. If grounded to the panel, to check if this ground is OK, use a digital voltmeter to measure the difference between the EDM ground and the engine block ground. If the difference is greater than 0.5 volts with the alternator charging, then remove the EDM ground (black wire) from instrument panel and connect it directly to the engine block ground.

• Make sure the probe wires are not routed along with ignition, alternator or engine cabin heater ignition wires.

If after checking all the above it still is erratic, then send an e-mail to:support@jpitech.com for a RMA number before sending in the EDM for repair.

First make sure the OAT, RPM, FF, and the MP are all working correctly, then follow the procedure below. ** (Note: MP must be calibrated first on the ground – engine off. See your EDM Pilot’s Guide for this procedure.)

Using the aircraft flight manual- POH. At cruise – 5000′ – adjust aircrafts RPM and MP for around 70% HP and follow steps 1-6.

1. Go to pilot PROGRAM mode (Hold both buttons to see PROGRAM).

2. Tap STEP until you see HP-? N and tap the LF button to change this to HP? Y. You will see the %HP appear on top of EDM display.

3. Now hold both buttons until the display changes to HPC= xxx. (ex: HPC= 120 )

4. Set the engine to a known power level using the aircraft flight manual- POH. At cruise – 5000′ – adjust aircrafts RPM and MP for around 70% HP per POH.

5. Hold or tap the LF button until the HP reading on the EDM display matches the percent (%) horsepower of the engine per your POH.

6. Tap STEP to exit. You will see the word SET and then it will automatically kick you out of the PROGRAM mode.

7. Now go to 7500′ and follow the same procedure – 1-6 -again at that altitude.

To check to see if your EDM-700 or 800 has the ability to accept Oil Pressure, first check the back of the EDM to see if there is a 9-pin middle connector between the top and bottom 25-pin connectors. If that middle connector is there, then go into Factory Limits to see if the EDM’s software has the new ‘OIL P? N’ option. To do this, follow the steps below:

1) Turn on EDM. After the self test, tap the ‘Step’ button to get past the ‘FILL? N” prompt. (If your EDM has fuel flow.)

2) Now press both buttons down until you see ‘PROGRAM’ and then take your fingers off.

3) Now you will see ‘FUEL? N’. (If your EDM has fuel flow, otherwise you will see ‘RATE’) Tap the ‘Step’ button until you see ‘END Y’. Now hold both buttons down again until you see ‘FAC LIM’. Then take your fingers off.

4) Now you will see ‘FAC? N’. Now tap the ‘Step’ button while looking at the different options. Look for ‘OIL P? N’. If you see this AND you have that middle 9-pin connector, then you are all set to add the Oil Pressure sensor and harness. If you do not see ‘OIL P? N’ in the list then you will need to pull the EDM and send it in to JPI for the Oil Pressure Upgrade. Again you must have these two things: 1) The 9-pin middle connector on the back of the EDM, and 2) ‘OIL P? N’ in the FAC LIM list.

5) Now tap the ‘Step’ button until you see ‘END Y’. Now tap the ‘Step’ button one more time to get out of FAC LIM mode completely. You can now power off the EDM.

If your EDM does not have the 9-pin connector or ‘OIL P? N’ in the FAC LIM list and you would like to add this upgrade, please call the Sales Department at JPI for the upgrade cost. They can be reached at 800-345-4574 x 201 or x 202. We can then set up for you a RMA number to send in your EDM for this.

#1) Make sure the correct Oil pressure sender is connected. 0-150 PSI – P/N 306018. A 0-150 psi sender has the number “0-10 bar” stamped on the nut on the bottom of the sender. (If it shows the number as “0-2 bar” you have a 0-30 psi sender.)

#2) To test the sensor – use Ohm meter:

0 PSI = 7.6 OHMS;

10 PSI = 24.1;

20 PSI = 39.4;

30 PSI = 52.6;

40 PSI = 63.6;

50 PSI = 75.0;

60 PSI = 87.6;

70 PSI = 98.6;

80 PSI = 109.5.

#3) To check the EDM, take both wires off the Oil pressure sender and put in between these two wires a resistor. For example: If you put a 52 ohm resistor between these wires, you should see around 30psi (+/-) on the EDM display.– [see above line item #2 with the different ohm values. You can use different resistors with these ohm values to generate the psi readings.]

EDM-700/800 Pin assignments( 4 or 6 cylinder ):
yel 1, red 2, OIL
yel 3, red 4, IAT (or ‘CARB’ if EDM is for a 7/8/9 cylinder engine.)
yel 5, red 6, CARB (or ‘CDT’ if ‘IAT’ installed)
yel 14, red 15, OAT
yel 16, red 17, TIT
yel 18, red 19, TIT-2 (2nd TIT)
gry 12, Remote alarm (Sinks to ground)
red 13, + Power(Red)
wht 24 , RS-232 data port
blk 25, Engine ground.(Black) ** ( Pin # 11 not used -not used.)