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Check Engine Light On

Written by Kevin Stoelb

Sunday, 12 June 2005

If the check engine light stays on after your Daihatsu Rocky (aka Daihatsu Feroza / Daihatsu Sportrak) is started the computer in your truck has detected a malfunction. A self-diagnosis system is built into the ECU of your vehicle. If any abnormality should occur in the signal systems of sensors, the self-diagnosis system memorizes the malfuntion code number in the ECU.

These codes are displayed when the following procedure is performed:

1. On the battery side of the vehicle there should be a green connector.
2. If the following conditions are met, short the test terminal with the ground terminal (pins 1 and 2 - see the figure below for reference)

(i) Battery voltage is at least 11 volts
(ii) Throttle valve fully closed
(iii) All accessory switches turned off

-----
|6 1|-
|5 2|
|4 3|-
-----

NOTE: Make sure no other pins are shorted except those specified.

3. Set the ignition switch to ON, making sure not to start the engine.
4. Record the diagnostic codes that are flashed by the check engine light. There will be a series of flashes that are seperated by short off periods; the codes will be seperated by longer pauses. Keep reading until the codes repeat.

Code No.	Diagnosis Item	Diagnosis Contents	Trouble Area
1	Normal	-	-
2	Pressure Sensor	When the input signal from the pressure sensor deviates from the specified value	Pressure sensor Pressure sensor circuit ECU
3	Ignition signal	When the ignition signal fails to be inputted	Distributor Ignitor Ignition coil Ignition system circuit ECU
4	Water temperature sensor	When the input signal from the water temperature sensor deviates from the specified value	Water temperature sensor Water temperature sensor circuit ECU
5	Oxygen sensor signal	When the input signal from the oygen sensor fails to be inputted under the certain conditions	Oxygen sensor Oxygen sensor circuit ECU
7	Throttle position sensor	When both idle switch and power switch enter"ON" conditions	Throttle position sensor Throttle position sensor circuit ECU
8	Intake air temperature sensor	When the input signal from the intake air temperature sensor deviates from the specified value	Intake air temperature sensor Intake air temperature sensor circuit ECU
9	Vehicle speed sensor	When the input signal from the vehicle speed sensor fails to be inputted under the certain conditions	Vehicle speed sensor Vehicle speed sensor circuit ECU
10	Starter signal	When the input signal from the starter fails to be inputted, until the certain conditions are satisfied: However, it should be noted that this code may be memorized when the vehicle is started by being pushed.	Starter Starter circuit ECU
11	Switch signal	When even one even one of the following conditions is satisfied with the test terminal shorted with the ground terminal: when the airconditioner is funtioning. when the idle switch is turned OFF	Air conditioner circuit Throttle position sensor Throttle position sensor circuit ECU
12	EGR control system	When it is judged that the EGR control system is not functioning normally under the certain conditions	EGR valve Modulator EGR VSV Water temperature sensor
15	Air-to-fuel ratio (rich fail)	When the feedback function performs reduction compensation beyond the specified level	Injector circuit Injector Fuel Pressure Pressure regulator Pressure sensor Water temperature sensor Water temperature sensor circuit Intake air temperature sensor Intake air temperature sensor circuit
16	Air-to-fuel ratio (lean fail)	When the feedback function performs increase compensation below the specified level	Injector circuit Injector Fuel Pressure Pressure regulator Pressure sensor Water temperature sensor Water temperature sensor circuit Intake air temperature sensor Intake air temperature sensor circuit

NOTE: if your check engine light doesn't flash, your diagnostic system may be having problems

Last Updated ( Monday, 31 October 2005 )

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Hello
Have a 92 feroza who engine light comes on intermittently while driving and loses power. Trying to locate check terminal to retrieve code but can only find diagnostics terminal on passenger side firewall, this has different pin configuration to diagrams in manual and this article. Any help would be appreciated.

Posted by Ryan Francis, on 09/01/2008 at 13:42

excelent site easy to follow and well set out. Gets straight to the point this site has helped me out and im a machanic thanks heaps

Posted by aaron, on 07/15/2008 at 13:19

what pins would you short (or what else can you do) to actually reset the check engine light?

Posted by James, on 02/17/2008 at 19:36

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