Nissan 200SX 1994 - 1998 - Reading ECU Codes

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Modified on 2011/12/18 23:01 by Robert Categorized as Featured, Maintenance, Nissan, Service

(10) » Mitsubishi Lancer Evolution 2007 - Present Maintenance, Service Instructions, and Manuals » Nissan 200SX 1994 - 1998 Maintenance, Service Instructions, and Manuals » Nissan 200SX 1994 - 1998 - Reading ECU Codes

This is a guide on how to manually read the ECU codes and what those codes mean on a Nissan 200SX SE-R.

Tools Needed¶

Flat head screw driver
Pencil and paper to record the numbers

Supplies Needed¶

Instructions¶

Reading the Codes¶

Locate the ECU (under your dash in the center) and look for a small screw next to a LED (towards the back end).
Turn the ignition to the ON position (engine not running).
Turn the screw fully clockwise, wait 2 seconds, and then turn it fully counter-clockwise.
The LED will start to display the code by a series of long flashes, followed by a series of short flashes. Your check engine light on the instrument cluster will also flash in the same sequence. This sequence will repeat.

Check Engine Light Codes and Meanings¶

Long blinks	Short blinks	Problem	Probable Cause
5	5	No self diagnostic codes present
1	1	Camshaft position sensor	Check the camshaft sensor or the circuit.
1	2	Mass airflow sensor/circuit	Mass airflow sensor source or ground circuit(s) may be shorted or open. Check the mass airflow sensor or circuit.
1	3	Coolant temperature sensor	The coolant sensor or circuit may be shorted or open. Check the coolant temperature sensor & circuit.
1	4	Vehicle speed sensor	Vehicle speed sensor signal circuit is open.
1	11	EVAP purge flow monitoring system	Have the vehicle diagnosed by a dealer service department.
1	14	Fuel system rich	Check the injector, fuel pressure, fuel pressure regulator, oxygen sensor &/or the MAF sensor.
1	15	Fuel system lean	Check the injector, fuel pressure, fuel pressure regulator, oxygen sensor &/or the MAF sensor.
2	1	Ignition signal	Ignition signal in the primary circuit is not entered during engine cranking or running (see a dealer service department or other qualified repair shop).
2	3	Closed throttle switch	Check throttle position sensor.
2	5	IACV/AAC valve	Check the IACV/AAC valve & circuit.
2	8	Overheating	Cooling fan or system is not operating correctly.
2	13	EVAP system	Check for small leak in system.
2	14	Purge volume control valve	Have the vehicle diagnosed be a dealer service department or other qualified repair shop.
3	1	ECM control unit	The ECM input signal is beyond “normal” range (see a dealer service department or other qualified repair shop).
3	2	EGR function	EGR control valve does not operate.
3	3	Front heated oxygen sensor malfunction	Check the component & its circuit.
3	4	Knock sensor	The knock sensor is open or shorted.
3	5	Exhaust gas temperature sensor	Exhaust gas temperature sensor circuit is open or shorted.
3	6	EGRC BPT valve	Check the EGRC BPT valve.
3	7	Closed loop operation	ECM does not enter closed loop operation. Check front oxygen sensor &/or heater.
3	9	Vent control valve	Check EVAP canister vent control valve.
3	11	Vacuum cut valve bypass valve	Have the vehicle diagnosed be a dealer service department.
3	12	EVAP system purge control valve	Have the vehicle diagnosed be a dealer service department or other qualified repair shop.
4	1	Intake air temperature sensor	IAT circuit is open or shorted.
4	2	Fuel temperature sensor or circuit	Check the component & its circuit.
4	3	Throttle position sensor	The TPS circuit is open or shorted.
4	9	Front oxygen sensor	Check the component & its circuit.
4	10	Front oxygen sensor	Check the component & its circuit.
4	11	Front oxygen sensor	Check the component & its circuit.
4	12	Front oxygen sensor	Check the component & its circuit.
5	3	Front oxygen sensor	Defective oxygen sensor, shorted oxygen sensor circuit, defective injectors or incorrect fuel pressure.
5	10	Rear oxygen sensor	Check the rear oxygen sensor & circuit.
5	11	Rear oxygen sensor	Check the rear oxygen sensor & circuit.
5	12	Rear oxygen sensor	Check the rear oxygen sensor & circuit.
5	14	EGR system	Have vehicle diagnosed by a dealer service department.
6	5	Cylinder 4 misfire	Check number 4 spark plug, ignition wire, compression or injector.
6	6	Cylinder 3 misfire	Check number 3 spark plug, ignition wire, compression or injector.
6	7	Cylinder 2 misfire	Check number 2 spark plug, ignition wire, compression or injector.
6	8	Cylinder 1 misfire	Check number 1 spark plug, ignition wire, compression or injector.
7	1	Multiple cylinder misfire	Check the spark plugs, ignition wires, injectors & compression readings for each cylinder.
7	2	Catalytic converter	Possible three way catalytic converter defective. Check for injector problems, damaged exhaust tube or intake manifold leak.
7	4	EVAP system	Check the EVAP control system pressure sensor.
7	5	EVAP system	Check for a small leak.
7	6	Fuel injection system malfunction	Mixture is too lean or too rich.
7	7	Rear oxygen sensor	Check the rear oxygen sensor & circuit.
8	1	Vacuum cut valve bypass valve or circuit	Have vehicle diagnosed by dealer service department or other qualified repair shop.
8	2	Crankshaft sensor	Check crankshaft sensor & circuit.
8	3	Absolute pressure sensor	Check component & its circuit.
8	4	A/T diagnosis comm line	Possible dead battery. Harness connectors between the ECM and automatic transaxle damaged.
8	7	EVAP canister purge control	Have vehicle diagnosed by dealer service department or otherqualified repair shop.
9	1	Front oxygen sensor heater	Check the front oxygen sensor heater and circuit.
9	2	Rear oxygen sensor heater	Check rear oxygen sensor heater and circuit.
9	3	Vent control valve	Check EVAP canister vent control valve.
9	5	Crankshaft position sensor	Possible damaged flywheel. Check crank sensor and/or circuit.
9	8	Coolant temperature sensor	Check ECT sensor & circuit.
10	3	Park/neutral switch	Check park/neutral switch circuit.
10	5	EGR solenoid valve circuit	EGR valve & EVAP canister purge control solenoid valve is open or shorted
10	8	EVAP system	Check EVAP canister purge control valve.
11	1	Inhibitor switch	Check inhibitor switch and circuit.
11	2	A/T vehicle speed sensor	Check vehicle speed sensor and circuit for the automatic transaxle.
11	3	A/T first signal	Have vehicle diagnosed by dealer service department or other qualified repair shop.
11	4	A/T second signal	Have vehicle diagnosed by dealer service department or other qualified repair shop.
11	5	A/T third signal	Have vehicle diagnosed by dealer service department or other qualified repair shop.
11	6	A/T fourth signal	Have vehicle diagnosed by dealer service department or other qualified repair shop.
11	7	A/T torque converter clutch	Have vehicle diagnosed by dealer service department or other qualified repair shop.
11	8	Shift solenoid A	Have vehicle diagnosed by dealer service department or other qualified repair shop.
12	1	Shift solenoid B	Have vehicle diagnosed by dealer service department or other qualified repair shop.
12	3	Overrun clutch solenoid	Have vehicle diagnosed by dealer service department or other qualified repair shop.
12	4	TCC solenoid	Have vehicle diagnosed by dealer service department or other qualified repair shop.
12	5	Line pressure solenoid	Have vehicle diagnosed by dealer service department or other qualified repair shop.
12	6	TPS for A/T	Have vehicle diagnosed by dealer service department or other qualified repair shop.
12	7	Speed signal A/T	Have vehicle diagnosed by dealer service department or other qualified repair shop.
12	8	A/T fluid temperature sensor	Have vehicle diagnosed by dealer service department or other qualified repair shop.
13	2	MAP/BAR switch solenoid valve or circuit	Have vehicle diagnosed by dealer service department or other qualified repair shop.
13	5	Fuel pump control module or circuit	Have vehicle diagnosed by dealer service department or other qualified repair shop.
13	8	Cooling fan	Have vehicle diagnosed by dealer service department or other qualified repair shop.

Resetting the ECU¶

Once the screw is turned fully clockwise and counter-clockwise again, the ECU will be reset.

Please use care and common sense when working on your car. Experience and proper tools are always required when performing maintenance on your vehicle. Any instructions or definitions of car repair on this site are to be followed at your own risk. If you have questions or concerns about a procedure, please consult a professional before doing the work. WikiAuto is not responsible for damage or injury caused by following instructions on this site.