no fuel or spark

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04-14-2007, 07:01 PM

bulldogg9279

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no fuel or spark

im not getting any spark or fuel. i pulled the plugs. there was no fuel on them. when i turn the key on with the fuel line unhooked. i get no fuel threw there. unless i jump the wires on the main relay. ive swithched out the main relay. with a good one still no start. this all started after i hooked up my vtec sylenoid & pressure switch wires. but i also put the ecu in its little cubby hole. i rechecked everything i did. it all looks good. i decided to pull the dizzy cap. and i noticed it was pretty rusty under there. a under statement. also a crack.. i replaced the dizzy. still nothing.

but when ever i unplug conector D on the ECU the car will run. the main relay will click and the fuel pump will prime as soon as its unpluged. so what in conector D would cause this? it will idle & rev just like theres nothing wrong.

04-14-2007, 07:49 PM

HMTdmc

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Re: no fuel or spark

Well what all have you done to the car and how did you find out that it would start with the d connector unplugged? what I meen is why would you think to unplug one plug of the ecu?

04-14-2007, 08:13 PM

bulldogg9279

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Join Date: Nov 2003

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Re: no fuel or spark

i turned the ignition on. so i could move the wires around. to see if there was a short in the harness. with the ignition on. i was going to switch out the ECU with another P28. thats when i heard the pump. i unpluged IACV and the TPS to see if they had some kind of short. but stopped there. i may do some more unpluging of stuff in the engine bay. to see if i can get it to prime with the plug in. im thinking some sensor or alternator is shorted out.

04-14-2007, 08:21 PM

HMTdmc

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Re: no fuel or spark

Youve definatly got a short somewhere. pull the cover off the ecu and see if theirs any burnt spots or melted solder.

04-14-2007, 08:30 PM

bulldogg9279

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Re: no fuel or spark

Quote:

Originally Posted by Dmc1

Youve definatly got a short somewhere. pull the cover off the ecu and see if theirs any burnt spots or melted solder.

already did. looks perfect. it did this with 2 diffrent p28's

04-14-2007, 10:09 PM

HMTdmc

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Re: no fuel or spark

Here use this. this pinout gives you voltage and stuff so it's a little better to trouble shoot with. Ive had some weird stuff happen in the past with ecu pinouts I accindentaly hooked a wideband ground to D2 and it would pop my brakelight fuse!!

KEY:
(voltage values measured in DC Volts unless otherwise specified)
V = Volts
Wht = White
Blk = Black
Grn = Green
Yel = Yellow
Brn = Brown
Blu = Blue
Org = Orange

KOEO = Key On Engine Off
KOER = Key On Engine Running

A, B, D= Slot. Numbers are read up and down from left to right, not straight across (see diagram at end).

A1-INJ1 INJECTOR#1 Brown, Battery Voltage with KOEO
A2-INJ4 INJECTOR#4 Yellow, Battery Voltage with KOEO
A3-INJ2 INJECTOR#2 Red, Battery Voltage with KOEO
A4-VTS VTEC solenoid GRN/YEL, n/a
A5-INJ3 INJECTOR#3 Blue, Battery Voltage with KOEO
A6-PO2SHTC O2 sensor heating element Org/Wht, Battery Voltage with KOEO
A7-FLR1 fuel pump Grn/BLK, Battery Voltage with KOEO
A8-empty A7 and A8 have the same circurt, so they can be the same
A9-IACV IAC valve Blk/Blu, About 10v KOEO on Warm engine
A10-empty
A11-EGR Control Solenoid Valve (if the ECU has it) Red, n/a
A12-FANC engine coolant temp switch Blu/red, n/a
A13-MIL MIL (check engine light) Blu/wht, n/a
A14-empty
A15-ACC (a/c compressor clutch) Red/Blu, n/a
A16-ALT C alternator Wht/Grn, n/a
A17-IAB IAB Solenoid Pink, n/a
A18-Org/Red, Transmission Control Module (A/T), n/a
A19-White, Intake control solenoid, Battery Voltage with KOEO
A20-PCS EVAP purge control solenoid Red/Grn, n/a
A21-ICM Yel/Grn, Ignition Control Module output signal, About 10V KOEO
A22-Igniter, same as A21
A23-PG1 ground Black, Power ground, less than 1V
A24-PG2 ground same as A23
A25-IGP2 to main relay and to ground Yel/blk, Battery positive from Main relay, Battery Voltage with KOEO
A26-LG1 gound Blk/red, less than 1V

B1-IGP2 to pin A25 Yel/Blk, Battery positive from Main relay, Battery Voltage with KOEO
B2-LG2 ground to shields for CYP & TDC Brown/Blk, <1V
B3-Orange, upshift/downshift comparative input, n/a
B4-Pink, upshift/downshift comparative input, n/a
B5-ACS a/c switch Blu/Blk, a/c input, ~5V with KOEO & A/C off; <1V KOER with A/C & blower on
B6-empty
B7-Light green, Park/Neutral switch (A/T), <1V in Park or Neutral with KOEO; 5V in Park or neutral with KOER; Battery voltage in all other positions
B8-PSPSW PSP switch Red/Green, Power steering oil pressure switch, 0V KOEO; Battery Voltage KOER While slowly turning steering wheel
B9-STARTER SIGNAL starter signal Blue/red, Battery Voltage in the START position (clutch depressed on M/T models)
B10-VSS vehicle speed sensor Orange, Pulses 0-12V while turning the left front wheel
B11-CYP P CYP(#1 piston position) -P Orange, CYP sensor input, n/a
B12-CYP M CYP -M White, CYP sensor signal, n/a
B13-TDC P TDC(top dead ceter) -P Org/Blue, TDC sensor input, n/a
B14-TDC M TDC -M Wht/Blue, TDC sensor signal, n/a
B15-CKP P CKP(crank position) -P Blu/Green, CKP Sensor input, n/a
B16-CKP M CKP -M Blu/yel, CKP Sensor signal, n/a

D1-VBU Back Up Power Wht/Yel, Battery positive From battery through Fuse Box, Battery Voltage at ALL times
D2-BKSW brake switch Grn/wht, Battery voltage at all times
D3-KS Knock Sensor Red/Blue, n/a
D4-SCS service check connector Brown/Wht, ~5V (M/T); ~11V (A/T)
D5-empty
D6-VTM VTEC pressure switch Light Blue, n/a
D7-TXD/RXD (data link connector) Light Green/Red, n/a
D8-empty
D9-ALT F alternator Wht/Red, Alternator Charging Signal, ~4.5V KOEO; Decreases under Electrical load (Headlights & rear defogger on) At warm idle
D10-ELD electric load detector input Grn/Blk, n/a
D11-TPS (throttle position sensor) Signal Red/Blk, ~0.5V KOEO with throttle fully closed; ~4.5V KOEO with throttle fully open
D12-Wht/Blk, EGR Valve Lift sensor, ~1.2V KOEO
D13-ECT (engine coolant temp) sensor input Yel/Blu, ~5V KOEO (varies with temperature)
D14-PHO2S O2 sensor White, heated 02 sensor Signal, 0.4-0.5V when ignition is turned on; drops to less than 0.1V within 2 minutes
D15-IAT Intake Air Temperature sensor signal Red/Yel, .05-4.5V KOEO(Varies with temperature)
D16-VREF (no info)
D17-MAP Map Signal Wht/Blu, ~3V KOEO (Varies with Temperature)
D18-Light Green/Blk, Transmission Control Module (A/T Only), n/a
D19-Red/Wht, Reference Voltage, ~5V KOEO
D20-Yel/Wht, Reference Voltage, ~5V KOEO
D21-Blue/Wht, Sensor ground, <1V
D22-Green/Wht, Sensor ground, <1V

__________________

04-15-2007, 03:11 PM

bulldogg9279

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Thread Starter

Join Date: Nov 2003

Posts: 424

Re: no fuel or spark

i figured it out! when i was pulling the battery tray out. i knocked off the negative battery conector. in the process of putting it back on. some of the wire splinters fell off into the engine harness plug. i did not see this. so i conected the plug. and a splinter made a connection between two terminals. and you ask why the plugs would be down there. cause i did a minor wire tuck. and relocated them under the battery tray. but she runs and the engine light is off.