running on one...electrical problems driving me crazy
#1
running on one...electrical problems driving me crazy
My car is running on one rotor and the map sensor reading is off.
I've got compression. I tested the coils, they're good, getting power just not all firing. I've tested the ecu in another FD and it works fine.
On my PowerFC in 'map trace' mode the marker only moves horizontally across the map. It will drop down a row or two if I get into boost, but then it continues the same horizontal only path, not moving through the load points.
I'm thinking I have an issue with the dash harness, or something it connects to, but I'm really not sure what the next step is, electrical isn't my strong suit.
I had previous issues with a pin in the B1-01 connector melting at either 1A or 1C
I've got compression. I tested the coils, they're good, getting power just not all firing. I've tested the ecu in another FD and it works fine.
On my PowerFC in 'map trace' mode the marker only moves horizontally across the map. It will drop down a row or two if I get into boost, but then it continues the same horizontal only path, not moving through the load points.
I'm thinking I have an issue with the dash harness, or something it connects to, but I'm really not sure what the next step is, electrical isn't my strong suit.
I had previous issues with a pin in the B1-01 connector melting at either 1A or 1C
#2
RX-7 Bad Ass
iTrader: (55)
First off, I hope you don't have a check valve between the boost sensor and the throttle body. There should be a filter there.
Also, I assume the vacuum line to the MAP sensor is actually hooked up?
Dale
Also, I assume the vacuum line to the MAP sensor is actually hooked up?
Dale
#4
I havent been driving the car since it runs on one...i definitely wouldnt boost it that way. That was a previous issue I had before running on one rotor, I just realized that they're (map and coils) both on the pinout for the same connector so I thought I'd include that info.
Dale, I have the filter and the vacuum line is hooked up. I've tried a spare oem map, an apexi map. This issue is related to my wiring
Dale, I have the filter and the vacuum line is hooked up. I've tried a spare oem map, an apexi map. This issue is related to my wiring
Last edited by sukimoto; 05-15-16 at 11:32 AM.
#5
RX-7 Bad Ass
iTrader: (55)
Just trying to eliminate possibilities, I've seen people kill themselves chasing a problem when it's something simple!
Do you know for a fact it's spark and not fuel?
Dale
Do you know for a fact it's spark and not fuel?
Dale
#6
I took off the UIM and tested the coils out. I know for a fact I have issues with spark, I haven't ruled fuel out yet but if its tied into that harness at all I'm willing to bet I have issues there too. The sensor check screen on my powerfc was lit up with black highlights and 4.99V readings
#7
RX-7 Bad Ass
iTrader: (55)
If you're getting 4.99v readings, you need to start with that. May want to post a pic of the sensor check screen.
Dale
Dale
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#9
RX-7 Bad Ass
iTrader: (55)
OK, so it's amazing the car is running AT ALL. Those 4.99 volt readings are your problem.
PIM - that's the MAP sensor
VTA1 - half of the TPS sensor
VMOP - oil metering pump, if you're not using it (like premix) no biggie, but if you are, biggie.
WTRT - Water temp
AIRT - Air temp
FUEL - Fuel temp sensor
Basically, ALL the inputs to the ECU that it needs to run aren't responding. It might be the 5v power going to all the inputs that could be at fault. There's going to be some common reason, either that or a ground isn't connected or something.
Dale
PIM - that's the MAP sensor
VTA1 - half of the TPS sensor
VMOP - oil metering pump, if you're not using it (like premix) no biggie, but if you are, biggie.
WTRT - Water temp
AIRT - Air temp
FUEL - Fuel temp sensor
Basically, ALL the inputs to the ECU that it needs to run aren't responding. It might be the 5v power going to all the inputs that could be at fault. There's going to be some common reason, either that or a ground isn't connected or something.
Dale
#10
grounds have all been gone through and cleaned up where needed. extras added.
is there a way i can test that dash harness to rule it out as the problem?Do the ignition coils or any of the affected sensors tie into connectors X-05, X-07 or X-14?
is there a way i can test that dash harness to rule it out as the problem?Do the ignition coils or any of the affected sensors tie into connectors X-05, X-07 or X-14?
Last edited by sukimoto; 05-15-16 at 03:23 PM.
#14
RX-7 Bad Ass
iTrader: (55)
You most likely have a major problem of some kind with the ECU harness. I doubt it's the dash harness.
Do you have a stock or aftermarket ECU harness?
What happened between when the car was running right and now? Might be something that was done to the car.
You're in for major electrical work, and this is way more tricky than something we can tell you. You may need to find someone that can help with this problem. If none of the sensors are reporting to the ECU, you've got some common problem with that 5v feed, and that could be most anything.
Dale
Do you have a stock or aftermarket ECU harness?
What happened between when the car was running right and now? Might be something that was done to the car.
You're in for major electrical work, and this is way more tricky than something we can tell you. You may need to find someone that can help with this problem. If none of the sensors are reporting to the ECU, you've got some common problem with that 5v feed, and that could be most anything.
Dale
#15
endless build
iTrader: (15)
x-05 & x-14
x-05 has : - 1st gear switch
- magnetic cluth a/p
- pressure sensor (x2)
- a/p magnetic clutch
- Injectors
- Cooling Relays
- Soloneid Valves
- 2nd gear switch
- clutch switch
- clutch interlock
----------------------
X-14 has : -Speedo input (x2)
- Rev Light Power to light
- ground neutral
- Temp gauge
- Fuel Thermo Sensor
- Cluster Ground
- Rev light power to switch
- ground 2nd gear
- ground 1st gear
- h20 thermo fan switch
- Neutral
- Electrical load input
But i personally think that if you fried the computer at B1-01 is that you had a problem with the EC/AT computer.
i would try to change that first and then the Firewall harness (not to be confuse with DASH harness).
either way you have to remove your dash if you suspect the culprit is in there.
check the resistance, you might have a short somewhere that is affecting the car severely.
All the connectors your talking about are on the Firewall harness & are **critical**.
did you perform a auto to manual swap in the past ?
- magnetic cluth a/p
- pressure sensor (x2)
- a/p magnetic clutch
- Injectors
- Cooling Relays
- Soloneid Valves
- 2nd gear switch
- clutch switch
- clutch interlock
----------------------
X-14 has : -Speedo input (x2)
- Rev Light Power to light
- ground neutral
- Temp gauge
- Fuel Thermo Sensor
- Cluster Ground
- Rev light power to switch
- ground 2nd gear
- ground 1st gear
- h20 thermo fan switch
- Neutral
- Electrical load input
But i personally think that if you fried the computer at B1-01 is that you had a problem with the EC/AT computer.
i would try to change that first and then the Firewall harness (not to be confuse with DASH harness).
either way you have to remove your dash if you suspect the culprit is in there.
check the resistance, you might have a short somewhere that is affecting the car severely.
All the connectors your talking about are on the Firewall harness & are **critical**.
did you perform a auto to manual swap in the past ?
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