Subaru 2002 IMPREZA Service Manual page 714

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
CF:DTC P1698 — ENGINE TORQUE CONTROL CUT SIGNAL CIRCUIT LOW IN-
PUT —
• DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN-49, OPERATION,
Clear Memory Mode.> and Inspection Mode <Ref. to EN-42, OPERATION, Inspection Mode.> .
• WIRING DIAGRAM:
B55
B134 ECM
Step
1 CHECK OUTPUT SIGNAL FROM ECM.
1)Start the engine and warm-up engine.
2)Turn the ignition switch to OFF.
3)Turn the ignition switch to ON.
4)Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B134) No. 31 (+) — Chassis ground ( − − − − ):
TCM
Is the voltage more than 3 V?
1 2 3 4
10 11 12
19 20 21
1 2
8 9
20 21
Check
EN-282
B55
5 6 7 8 9
13 14 15 16 17 18
22 23 24
B135
3 4 5 6 7
10 11 12 13 14 15 16 17 18 19
26 27 28
22 23 24 25
Yes
Repair the poor Go to step 2.
contact in ECM
connector.
EN0890
No