frustration

[Airgetcha]

88 CRX Si with B16A P30 ecu. I am a poor man, so I spliced wires to the ecu. I used 3 different references to confirm ecu pin outs. So, the motor will turn-over and the fuel pump will buzz but no spark. Here's some trouble shooting I have performed up till this point.

1. replaced ignitor with known working ignitor.
2. checked #32 fuse and is good.
3. checked for battery voltage between black/yellow wire and ground. ok.
4. checked for battery voltage between white/blue wire and ground. ok.
7. checked for continuity between ignitor body and distributor housing. ok.


any help will be appreciated.
Thanks airgetcha

 

[RSBAD454]

back up here Turbo.......i read you are using a P30 OBD-1 ECU in your 88 Si? did you do a non OBD to OBD-1 conversion?

 

[Airgetcha]

I converted to OBD-1 by splicing wires as best I could. I realize this is most likely the problem, but I followed reference material closely.

ECU Pinouts


p30_obd1
A1 BRN INJ1 INJ1
A2 YEL INJ4 INJ4
A3 RED INJ2 INJ2
A4 ORN/WHT VTS VTEC solenoid
A5 LT BLU INJ3 INJ3
A6 ORN/BLK PO2SHTC O2 sensor (heating element)
A7 GRN/YEL FLR1 fuel pump
A8 (empty)
A9 GRN/WHT IACV IAC valve
A10 (empty)
A11 (empty)
A12 YEL/GRN FANC Fan Output
A13 GRN/ORN MIL MIL (check engine light)
A14 (empty)
A15 BLK/RED ACC (a/c compressor clutch)
A16 WHT/YEL ALT C alternator
A17
A18 (empty)
A19 (a/t trans only)
A20 RED PCS EVAP purge control solenoid
A21 RED/GRN ICM ICM
A22 (empty)
A23 BLK PG1 ground
A24 BLK PG2 ground
A25 YEL/BLK IGP2 to main relay and to gound for o
A26 BRN/BLK LG1 gound
B1 YEL/BLK IGP2 to pin A25
B2 BRN/BLK LG2 ground to shields for CYP & TDC
B3 (a/t trans only)
B4 (a/t trans only)
B5 BLU/RED ACS a/c switch
B6 (empty)
B7 (a/t trans only)
B8 BRN/RED PSPSW PSP switch
B9 BLU/WHT clutch interlock switch
B10 YEL/BLU VSS vehicle speed sensor
B11 ORN CYP P CYP -P
B12 WHT CYP M CYP -M
B13 ORN/BLU TDC P TDC -P
B14 WHT/BLU TDC M TDC -M
B15 BLU/GRN CKP P CKP -P
B16 BLU/YEL CKP M CKP -M
D1 WHT/BLU VBU Back Up Power
D2 GRN/WHT BKSW brake switch
D3 KS Knock Sensor
D4 BRN SCS service check connector
D5 (empty)
D6 ORN/BLU VTM VTEC pressure switch
D7 LT BLU TXD/RXD (data link connector)
D8 (empty)
D9 PNK ALT F alternator
D10 GRN/RED ELD electric load detector
D11 RED/BLU TPS TPS Signal
D12 YEL/GRN
D13 RED/WHT ECT ECT sensor
D14 WHT PHO2S O2 sensor
D15 RED/YEL IAT IAT sensor
D16 WHT/YEL VREF VREF
D17 WHT MAP Map Signal
D18 (a/t trans only)
D19 YEL/GRN VCC1 MAP 5V
D20 YEL/WHT VCC2 TPS 5V
D21 GRN/BLU SG1 MAP GND
D22 GRN/WHT SG2 TPS GND


ECU Pinouts
pr3_a
A1 BRN INJ1 fuel injector control # 1
A02 BLK PG1 Ground
A03 RED INJ2 fuel injector control # 2
A04 BLK PG2 Ground
A05 LT BLU INJ3 fuel injector control # 3
A06 GRN purge cut-off solinoid valve
A07 YEL INJ4 fuel injector control # 4
A08 VTS VTEC solenoid
A09
A10 Pressure Regulator Cutoff Soleno
A11 BLU/YEL IACV from electronic air control valv
A12 GRN/BLK FLR1 fuel pump control
A13 YEL/BLK IGP1 power Input
A14 GRN/BLK FLR2 fuel pump control
A15 YEL/BLK IGP2 power Input
A16 BRN/BLK ground
A17
A18 BLK/RED ground
B01 WHT/GRN VBP Battery Backup
B02
B03 YEL ACC a/c compressor clutch relay cont
B04 FANC
B05 WHT/YEL VTM VTEC pressure switch
B06 GRN/ORN MIL check engine warning light
B07
B08 YEL/GRN ACS a/c on input
B09
B10 ORN CYP P crank sensor (1)
B11 Fuse Box
B12 WHT ? CYP M crank sensor (2)
B13 BLU/WHT starting input
B14 BLU ALT alternator output signal
B15 WHT ? ignition output signal
B16 YEL/RED VSS VSS
B17 WHT ? ignition output signal
B18
B19 KS Knock sensor
B20 BRN SCS ignition timing adjusting connec
C01 BLU/GRN CKP P CYL sensor (1)
C02 BLU/YEL CKP M CYL sensor (2)
C03 ORN/BLU TDC P TDC sensor (1)
C04 WHT/BLU TDC M TDC sensor (2)
C05 RED/YEL IAT intake air temperature sensor
C06 RED/WHT ? ECT coolant temperature sensor
C07 RED/BLU TPS throttle angle sensor
C08 O2S Dual O2 Sensor (JDM)
C09 RED/WHT ? PA atomosphere pressure sensor inpu
C10 GRN/WHT ? BKSW brake light switch
C11 GRN/WHT ? MIL ground
C12 GRN/WHT ? SG2 TPS GND
C13 YEL/WHT VCC1 TPS 5V
C14 SG1 MAP GND
C15 YEL/RED VCC2 MAP 5V
C16 WHT O2S oxygen sensor

if this reference material is incorrect please let me know.

also, I can crank the engine over without the ECU connected. should I be able to do this?

Thanks Airgetcha

 

[RSBAD454]

i have yet to do this swap.....but did you use a jumper harness between ECU and Carside harness? did you wire Dizzy connector correctly?

 

[4gCRX]

Check all of your grounds, plug gap (.039-.043)...

 

[Airgetcha]

Jumper harness?.....not sure what that is, but what I did do was use my old harness from the 88 Si. Spliced it to the distributor plugs that came with the new engine. Did I connect the wires correctly, problably not. I just spliced the same colored wires to the distributor plugs. If anyone has any idea's on this please let me know. I have not been able to fined a list of color coded wires for a PM6 ECU.
I realize its obdo, but are all obdo ECU colored wires the same? Also, I inadvertently shifted the distributor when I took it apart. I understand this will advanced or retard the timing, but will it prevent spark?

while troubleshooting a coolant leak I found the ground to thermostate housing disconnected. I connected it and still nothing. The next thing I will try is checking for voltage to the ecu pin#a25, I believe this is the ignition power.

symptoms: every time I crank the engine over I can smell fuel, but no obvious leaks that I can see. I pulled a plug and grounded it and had the engine turned over. I saw spark twice but could not consistently reproduce it suggesting this was static buildup?

Thanks

Airgetcha