Toyota 1RZ Supplement Manual page 109

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DI- -20
DTC
CIRCUIT DESCRIPTION
The IIA in the Engine Control System contains signal plate and a pickup coil for NE signal.
The NE signal plate has 4 teeth on its outer circumference. The NE signal sensor generates 4 signals for
every engine revolution. The ECU detects the engine speed by the NE signals.
DTC No.
12 No NE signal to ECU during cranking
NE Signal Waveforms
NE
20m sec./Division(Idling)
WIRING DIAGRAM
NE Signal Sensor
DIAGNOSTICS
12 NE Signal Circuit
Detection Item
Reference: INSPECTION USING OSILLOSCOPE
During cranking or idling, check between terminals NE+ and
2 V/
NE-- of engine ECU.
Division
(Idling)
HINT:
The correct wavaforms are as shown.
A00505
2
16
4
16
3RZ-F,3RZ-FE
- - ENGINE (1RZ- -E)
S Open or short in NE circuit
S IIA
S Open or short in STA circuit
S Engine ECU
R
G
CONTINUED
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TO MODEL INDEX
DI1HN- -01
Trouble Area
Engine ECU
21
NE+
E4
9
NE--
E4
E1
A02470