INSPECTION PROCEDURE 1 Check voltage between terminals KS and E1 of engine control module connector. START SST ECM B 69, 66 E1 KS BE6653 FI6502 P Connect SST (check harness "A"). (See page EG–404) SST 09990–01000 C Measure voltage between terminals KS and E1 of engine control module connector while engine is cranked. OK Voltage: 2.0 — 4.0 V (Neither 0 V nor 5 V) Reference INSPECTION USING OSCILLOSCOPE KS Signal Waveform 1 V/Div. 0 V 10 msec./Division (Idling) FI6512 • During cranking or idling, measure waveform between terminals KS and E1 of engine control module. HINT: The correct waveform is as shown. NG OK When diagnostic trouble code 31 is displayed, check and replace engine control module. 2 Check for open and short in harness and connector between engine control module and volume air flow meter (See page IN–30). OK NG Repair or replace harness or connector.