05 -- 128
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DIAGNOSTICS
ECD SYSTEM (1ND -- TV)
COROLLA Supplement (RM1129E)
DTC P0642 SENSOR REFERENCE VOLTAGE ” A”
CIRCUIT LOW
DTC P0643 SENSOR REFERENCE VOLTAGE ” A”
CIRCUIT HIGH
CIRCUIT DESCRIPTION
Refer to DTC P0122 on page 05 -- 77
DTC No.
DTC Detection Condition
Trouble A rea
P0642
Power v oltages (5 V as s tandard) supplied from E CM to both
intake shutter position and accelerator pedal position s ensors
are l ower than appropriate thresholds
(The MIL i s illuminated as well as a DTC being set i mmediately
malfunction is detected)
S
Intake shutter position s ensor
S
Open or short i n i ntake s hutter position s ensor circuit
S
Accelerator pedal position s ensor
S
Open or short i n accelerator pedal position s ensor circuit
S
ECM
P0643
Power v oltages (5 V as s tandard) supplied from E CM to both
intake shutter position and accelerator pedal position s ensors
are higher than appropriate thresholds
(The MIL i s illuminated as well as a DTC being set i mmediately
malfunction is detected)
S
Intake shutter position s ensor
S
Open or short i n i ntake s hutter position s ensor circuit
S
Accelerator pedal position s ensor
S
Open or short i n accelerator pedal position s ensor circuit
S
ECM
HINT:
These DTCs are set when the ignition switch is in the ON position.
WIRING DIAGRAM
Refer to DTC P0122 on page 05 -- 77
INSPECTION PROCEDURE
1 CHECK OTHER DTC OUTPUT(IN ADDITION TO DTC P0642 AND/OR P0643)
(a) Connect an intelligent tester ll to the DLC3.
(b) Turn the ignition switch to ON and turn the intelligent tester ll ON.
(c)
Select the following menu items: Powertrain / Engine and ECT / DTC.
(d)
Read DTCs.
Result:
Display (DTC Output)
Proceed To
P0642 and/or P0643
A
P0642 and/or P0643 and other DTCs
B
HINT:
If any DTCs other than P0642 and/or P0634 are output, troubleshoot those DTCs first.
B
GO TO RELEVANT DTC CHART
A
05MS3--01
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TOYOTA COROLLA REPAIR MANUAL SUPP 1129E