Prior to fitting the injectors engine was fine, have done compresson check and all is fine. Engine was sweet before. In all respects so its not an engine problem.

 

I have checked the actual coil pack and its OK, I have no signal from two of the pins on the coil pack connector. Its the No 2 cylinder.

 

I also have fitted 555 injectors and No 5 doesnt fire, but as its got a spark I assume its the injector, what signal should I get from the injector connector, and when?

 

I have fitted a brand new series 4 PTU, and this made no difference, so my old PTU was ok.

 

I have tried two ECU's, problem stays the same.

 

I am assuming its a broken wire, or two.

 

I have looked at the online manual and can not find any useful info on how to check the wires.

 

I have looked at the CAS wires and they look OK. what ever I do nothing changes.

 

Can anyone help please? I just dont know where and how to look further.

Tracing broken wires is a pain in the butt. If you have eliminated everything else then in my opinion you are better off just running new cables.

 

Not sure how easy it would be to run but should be easier than trying to find the break.

 

Not much help I'm afraid but good luck with it.

 

Darrell

I would agree, my prob is that I dont know where to run them from. Does anyone have a decent wiring diagram?

 

Thanks, by the way.

Think you need to look at the eccs wiring diagrame but it is about 4 sheets long and wont scan very well.

 

Have tried scanning what should possibly be the right bit.

 

Hope it helps.

 

Unfortunately it dosent have a number on so is difficult to find in the online manual.

 

Good luck.

 

Darrell

OK, I should be able to find it, thanks. :-)

plug one of the old injectors into the plug and turn the cas by hand and see if the injector clicks.its probaly a bad connection or you may have a faulty new injector.rare but possible.

Thanks Jimmer, I have done that and it does click, the injectors were second hand from a guy on here. I should have checked them before fitting I know but I just wanted to get it running again asap and now I am regrettting it.

 

The injector I am not to bnothered about, I think it just needs replacing. Its the coul pack prob thats driving me mad.

Heres the ecu pin info , may help with tracing the prob knowing the ecu pin outs for the coil pack.HTH

 

1990-1995 Nissan 300ZX Pin

1 Ignition 1 Coil #1

2 Ignition 2 Coil #2

3 Ignition 3 Coil #3

4 AAC Valve

5 A/T Control Unit PW

6 Cooling Fan Relay (300ZX Turbo Only)

7 Tachometer

8 AIV Solenoid (90-92 300ZX)

9 Air Conditioner Relay

10 ECM Ground

11 Ignition 4 Coil #1

12 Ignition 5 Coil #2

13 Ignition 6 Coil #3

14 A/T Control Unit

15 A/T Control Unit

16 ECM Self-Shutoff Power Source

17 Data Link Connector

18 Fuel Pump Relay

19 Cooling Fan Relay

20 ECM Ground

21 Diagnostics Receive Data

22 Diagnostics Transmit Data Switch

23 Knock Sensor

24

25 Wastegate Solenoids (Turbo Only)

26 Mass Air Flow Sensor Ground

27 Mass Air Flow Sensor MAF

28 Engine Coolant Temperature Sensor

29 Right Side Heated Oxygen Sensor

30 Sensor Ground

31 Diagnostics Clock EGT

32 Malfunction Indicator Lamp

33 FICD Solenoid

34 Power Steering Oil Pressure

35 Fuel Pump Voltage Control (300ZX Turbo Only)

36 Fuel Temperature Sensor

37 --- Spare Temp Input Avail, 0-5 Volt

38 Throttle Position Sensor TPS

39 EGR Temperature Sensor

40

41 Camshaft Position Reference Signal

42 Camshaft Position Signal

43 Start Signal Cranking

44 Neutral Position Switch

45 Ignition Switch +12V

46 Air Conditioner Switch

47 Diagnostics Check Signal EGT

48 Power Source For Sensors +5V

49 Power Supply For ECM

50 ECM Ground

51 Camshaft Position Reference Signal

52 Camshaft Position Signal

53 Vehicle Speed Sensor

54 Idle Position Switch Switch

55 Left Side Heated Oxygen Sensor

56 Throttle Sensor Output Signal

57 Power Source For Idle Position Switch

58 Power Supply Back-Up Permanent +12V

59 Power Supply For ECM

60 ECM Ground

101 Injector 1

102 EGR Control Solenoid Valve Idle

103 Injector 3

104 Fuel Pump Voltage Control

105 Injector 5

106

107 ECM Ground Power Ground

108 ECM Ground Power Ground

109 Power Supply For ECM

110 Injector 2

111 PRVR Control Solenoid Valve Injector

112 Injector 4

113 VTC Solenoid Valves

114 Injector 6

115 O2 Sensor Heater Injector

116 ECM Ground Power Ground

Again, thanks. Armed with the above, and I managed to find the coil pack wiring info thanks to Cooper SWB I am going to attack it again today.

let me know how you get on please bud as have the same prob but different cylinder. have also changed everything, plugs, ptu etc so down to a broken wire somewhere.

cheers

OK. I wil, but keep in touch just in case I forget. :-)

 

TBH, now I have found the wiring diagram (thanks Cooper) it doesnt look too bad, famous last words maybe.

OK. I wil, but keep in touch just in case I forget. :-)

 

TBH, now I have found the wiring diagram (thanks Cooper) it doesnt look too bad, famous last words maybe.

 

cheers