Timing Chart - Toyota 1NZ-FE User Manual

EG-58
Operation
D As indicated in the following timing chart, when the ECM detects a start signal from the ignition switch,
it energizes the starter relay to operate the starter. If the engine is already running, the ECM will not
energize the starter relay.
D After the starter operates and the engine speed becomes higher than approximately 500 rpm, the ECM
determines that the engine has started and stops the operation of the starter.
D If the engine has any failure and does not work, the starter operates as long as its maximum continuous
operation time and stops automatically. The maximum continuous operation time is approximately 2
seconds through 25 seconds depending on the engine coolant temperature condition. When the engine
coolant temperature is extremely low, it is approximately 25 seconds and when the engine is warmed up
sufficiently, it is approximately 2 seconds.
D In case that the starter begins to operate, but cannot detect the engine speed signal, the ECM will stop
the starter operation immediately.
" A

Timing Chart

START
Ignition Switch
Position
ON
ON
Starter Relay
OFF
ON
Accessory Power
OFF
Engine Speed Signal
(NE)
ENGINE - 1NZ-FE ENGINE
Cranking Limit
Approx. 2 - 25 sec.
ECM determines that the engine has started
successfully when the engine speed is
approximately 500 rpm.
Successful
Starting of Engine
Failed Starting of
Engine
00SEG57Y