ENGINE AND EMISSION CONTROL SYSTEM
6E1-29
CODE NO.19 (P0115) ECT SENSOR CIRCUIT
(SIGNAL VOLTAGE HIGH OR LOW)
1. ECM
2. ECT sensor
3. ECT sensor coupler
4. To other sensors
5. To combination meter
NOTE:
When Code No.11 (P0105), 13 (P0120), 18 (P0110)
and 19 (P0115) are indicated together, it is pos-
sible that “B/G” wire is open or “E34-22” terminal
connection is poor.
STEP
ACTION
YES
NO
1
1) Disconnect ECT sensor coupler with ignition
switch OFF.
2) Check voltage between “Lg/B” wire terminal
of ECT sensor coupler and ground with igni-
tion switch ON.
Is voltage about 4 – 5 V?
Go to Step 2.
“Lg/W” wire open or short.
Poor “C52-8” connection.
2
1) Connect ECT sensor couple terminals using
service wire.
2) Check voltage between “Lg/B” wire terminal
of ECT sensor coupler and ground with igni-
tion switch ON.
Is voltage 0.15 V or less?
Go to Step 3.
“B/G” wire open or poor
“C51-22” connection.
If wire and connection are OK,
substitute a known-good ECM
and recheck.
3
1) Perform ECT SENSOR INSPECTION in this
section.
Is ECT sensor in good condition?
Poor connection of
ECT sensor coupler
terminals.
If connection is OK,
substitute a known-
good ECM and re-
check.
Faulty ECT sensor.
Fig. for STEP 1
Fig. for STEP 2
1. ECT sensor coupler disconnected
2. Engine ground
1. ECT sensor coupler disconnected
2. Service wire
3. Engine ground
NOTE:
Upon completion of inspection and repair work, perform DTC Confirmation Procedure, referring to page
6E1-30 to confirm that the trouble has been corrected.
