Code 51 + no spark

3.0 GT

2JZ Holset Mafia
Nov 30, 2008
381
1
0
Franklin, Tn
Hey, I just got a 88 turbo that needed a new headgasket. It started up fine but there was a bhg. so I tore it all down and put a new oem headgasket in and all other top end gaskets. Put it all back together and now there is no spark. I checked all wires and grounds and all is good. I checked fuses and all are good. I tried a coil pack off another supra and still no spark. I checked my diagnostic codes and it came up with code 51. Will someone who knows what could possibly be wrong please help me! I am so frustrated and I just want to drive the car LOL.
 

IJ.

Grumpy Old Man
Mar 30, 2005
38,728
1
0
63
I come from a land down under
51 Switch Signal
Diagnosis
No "IDL" signal, "NSW" signal or "A/C" signal to ECU, during diagnosis check.
Trouble Area
A/C switch circuit
A/C switch
A/C amplifier
Throttle position sensor circuit
Throttle position sensor
ECU