AW11 No Start (not even cranking).
Posted: Wed Dec 07, 2016 6:32 pm
So another AW11 no start issue. This one is maybe a little different..
Firstly my car is a JDM 1985 AW11. No AC, Originally automatic.
Just a brief background: I recently replaced the engine with another bigport 4age. At the same time I did a manual swap.
I went to test start the engine but it doesn't even crank at all. Can't even hear the click of the starter solenoid push the gear out into the flywheel. I believe this is due to me messing up the neutral safety switch wiring (which has to be modified when swapping to manual). The reasons for why I believe this to be the problem are provided below.
I have done some basic diagnostics as follows:
- All ground wires are fine; the engine, transmission and chassis are grounded. I checked this with a multi meter (probe on battery "+" and other probe on engine, then chassis, then transmission. By doing this I got +12V at all these points).
- Fusible link is fine. I am getting +12V at starter motor cable all the time and also at the alternator. Also my headlights and indicators work fine.
- Starter motor is fine. I checked this by connecting it to the battery and the solenoid pushes the gear out, the motor also seems to spin fine.
- Starting relay is fine. I checked by providing +12V across the coil terminals and I can hear it click. I also checked the relay coil continuity with a multi meter.
So! This only leaves the Neutral Safety Switch wiring?? I suppose I messed it up because the online picture I found to help me had different wire colours.
What I need help with:
* So now basically what I want to know is if it is possible to send a signal the the ECU connector directly to get it to think the car is in neutral/park.
* I found an ECU diagram which shows the top right pin on the 10p connector being for the NSW (Neutral Safety Switch).
* If I put this pin to ground will the car start up (or at least crank)??
Basically I just want to see if I can get it to crank/start before digging into the wiring again.
Oh and one more piece of information: I tested the starting relay by removing its cover and manually engaging it (by pressing together the switch terminals). When I did this the multi meter shows +12V being provided to the small starter motor connector (Not the battery + cable the starter solenoid cable).
I also hear a click from the boot which means the relay next to ECU is working I think.
Sorry for the long post, just wanted to provide as much info as possible. Any help is appreciated.
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Some extra pictures:
Starter testing:
0V at the starter solenoid connector normally EXCEPT when I manually actuate the starting relay and then it shows +12V. NOTE: It's hard to see but one probe is on battery "-" and other probe is in the starter solenoid connector:
This is how I manually activated the starting relay (Obviously has to remove the cover):
Firstly my car is a JDM 1985 AW11. No AC, Originally automatic.
Just a brief background: I recently replaced the engine with another bigport 4age. At the same time I did a manual swap.
I went to test start the engine but it doesn't even crank at all. Can't even hear the click of the starter solenoid push the gear out into the flywheel. I believe this is due to me messing up the neutral safety switch wiring (which has to be modified when swapping to manual). The reasons for why I believe this to be the problem are provided below.
I have done some basic diagnostics as follows:
- All ground wires are fine; the engine, transmission and chassis are grounded. I checked this with a multi meter (probe on battery "+" and other probe on engine, then chassis, then transmission. By doing this I got +12V at all these points).
- Fusible link is fine. I am getting +12V at starter motor cable all the time and also at the alternator. Also my headlights and indicators work fine.
- Starter motor is fine. I checked this by connecting it to the battery and the solenoid pushes the gear out, the motor also seems to spin fine.
- Starting relay is fine. I checked by providing +12V across the coil terminals and I can hear it click. I also checked the relay coil continuity with a multi meter.
So! This only leaves the Neutral Safety Switch wiring?? I suppose I messed it up because the online picture I found to help me had different wire colours.
What I need help with:
* So now basically what I want to know is if it is possible to send a signal the the ECU connector directly to get it to think the car is in neutral/park.
* I found an ECU diagram which shows the top right pin on the 10p connector being for the NSW (Neutral Safety Switch).
* If I put this pin to ground will the car start up (or at least crank)??
Basically I just want to see if I can get it to crank/start before digging into the wiring again.
Oh and one more piece of information: I tested the starting relay by removing its cover and manually engaging it (by pressing together the switch terminals). When I did this the multi meter shows +12V being provided to the small starter motor connector (Not the battery + cable the starter solenoid cable).
I also hear a click from the boot which means the relay next to ECU is working I think.
Sorry for the long post, just wanted to provide as much info as possible. Any help is appreciated.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
Some extra pictures:
Starter testing:
0V at the starter solenoid connector normally EXCEPT when I manually actuate the starting relay and then it shows +12V. NOTE: It's hard to see but one probe is on battery "-" and other probe is in the starter solenoid connector:
This is how I manually activated the starting relay (Obviously has to remove the cover):