Z17008
C SHORT
1
2
B
1
2
1
2
A
Fig. 5
Z17009
Fig. 6
Sensor
C
B
A
ECU
1
2
1
2
2
1
Z17808
Fig. 7
Sensor
B2
A
1
1
1
C
B1
1
ECU
2
2
2
2
--
INTRODUCTION
HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
01--35
COROLLA Supplement (RM1129E)
3.
CHECK SHORT CIRCUIT
(a)
If the wire harness is ground shorted (Fig. 5), locate the
section by conducting a resistance check with the body
ground (below).
(b)
Check the resistance with the body ground.
(1)
Disconnect connectors A and C, and measure the
resistance.
Standard (Fig. 6):
Tester Connection
Specified Condition
Connector A terminal 1 -- Body ground
Below 1
Ω
Connector A terminal 2 -- Body ground
10 k
Ω
or higher
HINT:
Measure the resistance while lightly shaking the wire harness
vertically and horizontally.
If your results match the examples above, a short circuit exists
between terminal 1 of connector A and terminal 1 of connector
C.
(2)
Disconnect connector B and measure the resis-
tance.
Standard (Fig. 7):
Tester Connection
Specified Condition
Connector A terminal 1 -- Body ground
10 k
Ω
or higher
Connector B2 terminal 1 -- Body ground
Below 1
Ω
If your results match the examples above, a short circuit exists
between terminal 1 of connector B2 and terminal 1 of connector
C.
4.
CHECK AND REPLACE ECU
NOTICE:
S
The connector should not be disconnected from the
ECU. Perform the inspection from the backside of the
connector on the wire harness side.
S
When no measuring condition is specified, perform
the inspection with the engine stopped and the igni-
tion switch ON.
S
Check that the connectors are fully seated. Check for
loose, corroded or broken wires.
(a)
First, check the ECU ground circuit. If it is faulty, repair it.
If it is normal, the ECU could be faulty. Replace the ECU
with a functioning one and check if the symptoms occur.
If the trouble symptoms stop, replace the ECU.
To Alphabetical Index
To Sub Index
TOYOTA COROLLA REPAIR MANUAL SUPP 1129E