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A84847
E21
Wire Harness Side:
EGR Valve Connector
Front View
G34805
ECM C onnector
E24
EGR2
EGR1
EGR4
EGR3
A84847
E21
Wire Harness Side:
EGR Valve Connector
Front View
A09818
Signal Waveform
10 V/
Division
GND
0.5 msec./Division
--
DIAGNOSTICS
ECD SYSTEM (1ND -- TV)
05 -- 119
COROLLA Supplement (RM1129E)
3 CHECK HARNESS AND CONNECTOR(EGR VALVE ASSY -- ECM)
(a) Disconnect the E21 EGR valve c onnector.
(b) Disconnect the E24 ECM connector.
(c) Check the resistance.
Standard (Check for open):
Tester Connection
Specified Condition
EGR1 (E24 -- 12) -- (E21 -- 4)
Below 1
Ω
EGR2 (E24 -- 11) -- (E21 -- 1)
Below 1
Ω
EGR3 (E24 -- 31) -- (E21 -- 6)
Below 1
Ω
EGR4 (E24 -- 30) -- (E21 -- 3)
Below 1
Ω
Standard (Check for short):
Tester Connection
Specified Condition
EGR1 (E24 -- 12) or (E21 -- 4) -- Body ground
10 k
Ω
or higher
EGR2 (E24 -- 11) or (E21 -- 1) -- B ody ground
10 k
Ω
or higher
EGR3 (E24 -- 31) or (E21 -- 6) -- Body ground
10 k
Ω
or higher
EGR4 (E24 -- 30) or (E21 -- 3) -- Body ground
10 k
Ω
or higher
(d) Reconnect the EGR v alve connector.
(e) Reconnect the ECM c onnector.
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
4 I NSPECT ECM(EGR VALVE ASSY VOLTAGE)
(a) Disconnect the E21 EGR valve c onnector.
(b) Inspect the ECM using an oscilloscope.
(c) While repeating quick engine RPM accelerations, c heck
the waveform between the terminals of the E21 EGR
valve c onnector.
Standard:
Tester Connection
Specified Condition
(E21 -- 6) -- Body ground
Correct waveform shown
(E21--5) -- Body ground
Correct waveform shown
(E21--4) -- Body ground
Correct waveform shown
(E21--3) -- Body ground
Correct waveform shown
(d)
Reconnect the EGR valve connector.
OK
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TOYOTA COROLLA REPAIR MANUAL SUPP 1129E