Possible faulty elite 1000 ecu?

[MeAndMyPenguin]

Hello, here is a breakdown of parts:

Car: 2002 Mazda Protege5
Engine: 2.0L FS-DE with cherry hall effect sensor for cam and crank
ECU: Elite 1000 w/ premium harness
Wiring: OEM engine harness has been removed and all sensors wired in with supplied haltech harness.

- 13.8v GY/R wire is giving off around 5.9v when the car is off. Checked pin A13 12v ignition input with ignition off and it is at 0v.
- R/G, R, and R/W wires from the haltech fuse block are going directly to battery (+). Black A10 and A11 are going directly to battery (-).
- The +5v and +8v sensor supply wires are reading 0v with ignition off.
- Power to OEM engine bay fuse box has been removed and that made no change.

Took the battery, haltech ECU and haltech harness out of the car and put it on a bench to test more. Wired the R/G, R, and R/W wires to battery (+) and A10 and A11 to battery (-). All other plugs/wires are disconnected. Checking the 13.8v GY/R wires, they are still reading 5.9v.

Removing relays one at a time from the haltech fuse box:

- removing ECU relay does nothing.
- removing injector relay does nothing.
- removing ignition relay does nothing.
- removing fuel pump relay will drop the voltage down from 5.9v to 4.4v.
- removing all relays and leaving fuel pump relay drops voltage from 5.9v to 4.4v
- removing all relays drops voltage down to 0v.

What would cause this to happen? Bad wiring on my part? Something faulty with the ECU? Any insight would be appreciated!

[JimKden]

I think you meant to say ground pins A10/A11 to battery, not B10/B11.

The attached fuse box schematic may help. +12V to A13 to the ECU sends +12v out pin A25 to the harness ECU relay coil to close the relay. Battery +12v to the ECU relay pin 30 with the relay closed will direct+12V out of the relay to pin B11 to power up the ECU.

ECU circuitry between pins A13 and A25 shown on the attached diagram is used to drop voltage out of pin A25, open the ECU relay and shut down the ECU on engine faults that you designate. (Designating shutdown conditions is not necessary to power up the ECU)

You can test and program the ECU alone on the bench with +12v to B11 pin and A10/A11 grounded.

[MeAndMyPenguin]

Yes, sorry about that. Pins A10 and A11 are grounded.

So, pin A25 and A24 are reading 12v regardless of pin A13 being connected to 12v. Are those 2 pins supposed to have 12v when ECU is shut off?

[JimKden]

Are you referring to probing the harness side of the connector?
If so, then yes, refer to the fuse box diagram. When nothing is connected to the pin it will read the supply voltage to the relay.

ECU A24 grounds the fuel pump relay to power the fuel pump and in the case of no rpm, it times out after the pump prime.

A13 on the harness connector side is direct connected to the switched input power, refer the fuse box diagram.

[MeAndMyPenguin]

Gotcha, sorry for the ignorance.

Everything on the fusebox is reading how it is supposed to be according to that diagram.

- +12v applied to A13 grounds out A25 and powers on ECU. Pin 87 on ECU relay outputs +12v.
- Fuel pump is set to prime for 3 seconds so A24 grounds out for 3 seconds then jumps back to +12v. Pin 87 on Fuel Pump relay outputs +12v for 3 seconds then back to 0v.

When +12v is removed from pin A13, pin A25 reads +12v and pin 87 on ECU relay outputs +5.9v. (This is with both the 26 and 34 pin plugs connected to ECU)

When removing either the 26 or 34 pin plugs from the ECU (leaving one plugged in), pin 87 on ECU relay outputs 0v. Removing both the 26 and 34 pin plug results in the same reading of 0v from pin 87 on ECU relay.

Does this sound like something on the harness is not correct?

[JimKden]

Maybe pull the relays and check the circuits per the fuse box diagram for continuity. There could be a wiring mistake. I found a wiring error long ago on a different model ECU/harness.

[MeAndMyPenguin]

With +12v supplied to harness and the 26/34 pin ECU plugs are connected, positive probe from multimeter on pin 87, negative probe on the others, continuity is present with pins 86, 85, and 30 on the ECU and Injection circuit. Confirmed with both relay connected, and relay disconnected. Ignition and Fuel pump circuit has no continuity except for pins 85 and 30.

When I remove the R/W wire from +12v but still leave the R/G, and R wires connected, everything drops down to 0v like it should. As soon I provide +12v to the R/W wire, that's when the 13.8v GY/R wires output 5.9v when ECU is powered off.

Also, once the R/W wire is removed from +12v, the ECU relay circuit has no continuity except for pins 85 and 30.