Circuit Inspection; Erence - Toyota 1KZ-TE Repair Manual

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IN- -18
6 . CI RCUI T I NSPECTION
How to read and use each page is shown below.
D Diagnostic Trouble Code No. and Detection Item
DTC
CIRCUIT DESCRIPTION
The crankshaft position sensor in the Engine Control System contains signal plate and a pickup coil for TDC signal.
The TDC signal plate has 1 tooth on its outer circumference. The TDC signal sensor generates 1 signal for every engine
revolution. The engine ECU detects the top dead center by the TDC signals. The NE signal plate has 52 teeth and is
mounted in the supply pump. The NE signal sensor generates 52 signals of engine 2 revolutions. The engine ECU detects
the engine speed and cam lift position of the supply pump. The engine ECU uses TDC signal and NE signals for injection
control. And NE signal is used for injection volume control, also.
DTC No.
12
No TDC signal to engine ECU at 500 rpm or more
WIRING DIAGRAM
Crankshaft Position Sensor
1
2
1
2
Engine Speed Sensor
(inside the Suppy Pump)
INTRODUCTION
Crankshaft Position Sensor Circuit Malfunc-
12
tion
DTC Detecting Condition
Engine ECU
6
G22+
B- -W
E7
L
5
B- -R
B- -R
E7
6
BR L
E7
NE- -
- - HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
D Circuit Description
The major role and operation, etc. of the circuit
and its component parts are explained.
Trouble Area
D Open or short in crankshaft position sensor
circuit
D Crankshaft position sensor
D Engine ECU
D Indicates the diagnostic trouble code, diagnostic
trouble code set parameter and suspect area of
the problem.
D Wiring Diagram
This shows a wiring diagram of the circuit.
Use this diagram together with ELECTRICAL
WIRING DIAGRAM to thoroughly understand the
circuit.
Wire colors are indicated by an alphabetical code.
B = Black, L = Blue, R = Red, BR = Brown,
LG = Light Green, V = Violet, G = Green,
O = Orange, W = White, GR = Gray, P = Pink,
NE+
Y = Yellow
The first letter indicates the basic wire color and the
second letter indicates the color of the stripe.
E2
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