Engine - DIAGNOSTICS

Description:

Categories: MR2 Mk3 Articles -> Engine

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[url=https://imoc.co.uk/app.php/kb/viewarticle?a=157&sid=3550c93cbbab1fad3c29bb4769ac04c0]Knowledge Base - Engine - DIAGNOSTICS[/url]

\PROBLEM SYMPTOMS TABLE\

When the malfunction is not confirmed in the diagnostic trouble code check and the problem still can not be
confirmed in the basic inspection, proceed to this problem symptoms table and troubleshoot according to
the numbered order given below.

Engine does not crank (Does not start)
Suspected Area:-
* Starter
* Starter relay
* Body ECU

No initial combustion (Does not start)
Suspected Area:-
* ECM power source circuit
* Ignition coil with igniter
* Fuel control circuit
* Injector circuit

No complete combustion (Does not start)
Suspected Area:-
* Ignition coil with igniter
* Fuel control circuit
* Injector circuit

Engine cranks normally (Difficult to start)
Suspected Area:-
* Starter signal circuit
* Ignition coil with igniter
* Spark plug
* Compression
* Injector circuit
* Fuel control circuit
* IAC valve circuit

Cold engine (Difficult to start)
Suspected Area:-
* Starter signal circuit
* Injector circuit
* Ignition coil with igniter
* Spark plug
* Fuel control circuit
* IAC valve circuit

Hot engine (Difficult to start)
Suspected Area:-
* Starter signal circuit
* Injector circuit
* Ignition coil
* Spark plug
* Fuel control circuit
* IAC valve circuit

High engine idle speed (Poor idling)
Suspected Area:-
* ECM power source circuit
* Back up power source circuit
* IAC valve circuit

Low engine idle speed (Poor idling)
Suspected Area:-
* Injector circuit
* Back up power source circuit
* Fuel control circuit
* IAC valve circuit

Rough idling (Poor idling)
Suspected Area:-
* IAC valve circuit
* Injector circuit
* Fuel control circuit
* Ignition coil with igniter
* Compression

Hunting (Poor idling)
Suspected Area:-
* ECM power source circuit
* Fuel control circuit
* IAC valve circuit

Hesitation/Poor acceleration (Poor driveability)
Suspected Area:-
* Injector circuit
* Ignition coil with igniter
* Fuel control circuit

Muffler explosion, after fire (Poor driveability)
Suspected Area:-
* Ignition coil
* Spark plug
* Injector circuit

Surging (Poor driveability)
Suspected Area:-
* Spark plug
* Injector circuit

Engine stall (Soon after starting)
Suspected Area:-
* Fuel control circuit
* IAC valve circuit

Engine stall (After accelerator pedal depressed)
Suspected Area:-
* Injector circuit
* IAC valve circuit
* ECM

Engine stall (After accelerator pedal released)
Suspected Area:-
* ECM
* IAC valve circuit

Engine stall (During A/C operation)
Suspected Area:-
* A/C signal circuit (Compressor circuit)
* ECM




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