Subaru SVX 1992 Manual page 563

3-2 [T5G0I
AUTOMATIC TRANSMISSION AND DIFFERENTIAL
G: TROUBLE CODE 23 - ENGINE REVOLUTION SIGNAL -
CONTENT OF DIAGNOSIS :
Engine revolution input signal circuit is open or
shorted .
TROUBLE SYMPTOM :
No lockup occurs (after engine warm-up)
Power indicator remains on when vehicle speed
,. .
1 Measure signal voltage input of TCU .
OK
Repair TCU terminal poor contact. (Replace TCU .)
Not OK
Not OK
2 Check harness between TCU and ECU (MPFI).
h- [Repair harness .
OK
Conduct troubleshooting for MPFI's ignition system .
861 B67
ECU
YDI
(for MPFl)
TCU
B61 (Y e I I ow) B67 (B I ack)
12345678 123456
191101 11 1 12113 114 115 116 1 1 7 1 8 1 9 10111
C3-173
Fig. 290
190