That's what I figured, was
bgpzfm142;c-160386 wroteNo RPM sensor signal will set code 2-1-4 on the EZ-K (socket #6) and may set code 1-3-1 on the ECU (socket #2).
RPM sensor wiring
[1] = Red, +12V - to EZ-K pin 10
[2] = Blue, signal - to EZ-K pin 23
[3] = Black, ground - to EZ-K pin 11
If you test the resistance using an ohm meter between terminals 1 and 2 of the RPM sensor when disconnected :
* RPM sensor p/n 1389567 (early) should read about 240 ohms - max 400 ohms when the engine is warm
* RPM sensor p/n 3547847 (later) should read about 170 ohms - max 350 ohms when the engine is warm
Testing the RPM sensor with a voltmeter - RPM sensor in circuit
Connecting a voltmeter between terminals [1] of the RPM sensor (EZ-K pin 10) and [2] of the RPM sensor (EZ-K pin 23) should display 500mV or thereabout when cranking.
See - TPH 32043/1, pages 104 and 105, test process FE
Thanks for this, invaluable info as always! New sensor did the trick.