Rodeo (2WD) L4-2559cc 2.6L SOHC (4ZE1) (1991)
Fuel Injection Circuits
IG COIL AND ECM (L4.2.6L)
GENERAL DESCRIPTION
The Electronic Control Module (ECM) to mainly controls the following items:
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Fuel control
The ECM controls the Air/fuel delivery to the combustion chamber by controlling the fuel flow through the injector(s).
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Electronic spark timing
This system is controlled by the ECM which controls spark advance (timing).
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Exhaust gas recirculation
This system uses a valve to feed a small amount of exhaust gas back into the intake manifold to control formation of NOx.
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Idle air control
The ECM controls the engine idle speed to the desired rpm, for different operating conditions.
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Diagnosis
If a sensor reading is not what the ECM thinks it should be, the ECM will turn on the "CHECK ENGINE" light and store a trouble code in the
memory. The trouble code tells which circuit the trouble is in. To get a trouble code out of the ECM, use the Assembly Line Diagnosis Linkage
(ALDL) connector.
Refer to Section 6 "ENGINE DIAGNOSIS" for details.