VVT sensor (VVT signal) consist of a signal plate and pickup coil. The VVT signal plate has 1 tooth on its ... Trouble Area. No VVT sensor signal to ECM during ...
VVT Sensor/Camshaft Position Sensor Circuit Malfunction
CIRCUIT DESCRIPTION VVT sensor (VVT signal) consist of a signal plate and pickup coil. The VVT signal plate has 1 tooth on its outer circumference and is mounted on the intake camshafts. When the camshafts rotate, the protrusion on the signal plate and the air gap on the pickup coil change, causing fluctuations in the magnetic field and generating an electromotive force in the pickup coil. The actual camshaft angle is detected by the VVT sensor and it provides feedback to the ECM to control the intake valve timing in response to during condition. DTC No.
DTC Detecting Condition
Trouble Area
No VVT sensor signal to ECM during cranking at 4 sec. or more P13450
Open or short in VVT sensor circuit VVT sensor ECM
No VVT sensor signal to ECM with 5 sec. or more engine speed 600 rpm or more While the crankshaft rotates twice, VVT sensor signal will be input to ECM 5 times
WIRING DIAGRAM
C1 Camshaft Position Sensor
ECM
1 2
18 G2 E7
B W (Shielded)
2
W
1
O
C2 Crankshaft Position Sensor
(Shielded)
W
16 NEE7 17 NE E7
E1
BR EB
A09056
2002 ECHO (RM884U)
Author:
Date:
289
DI-120 DIAGNOSTICS
-
ENGINE
INSPECTION PROCEDURE HINT: Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame records the engine conditions when the malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.
1
Check resistance of VVT sensor (See page IG-1 ).
G2 Signal Waveform
5 V/ Division
G2
NE-
NE+
NE20 msec./Division
A03961
Reference: INSPECTION USING OSCILLOSCOPE During cranking or idling, check between terminals G2 and NE-, and NE+ and NE- of the ECM connector. HINT: The correct waveform is as shown. The waveform frequency is shortened as the engine speed becomes higher. NG
Replace VVT sensor.
OK
2
Check for open and short in harness and connector between ECM and VVT sensor (See page IN-29 ).
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