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3S-GTE & 5S-FE Check Engine light and Engine Codes:

PDF File of more information also available by clicking here.

The ECU contains a built-in, self-diagnosis system which detects troubles within the engine signal network and which gives a warning by flashing the "CHECK" engine light on the instrument panel.

System malfunctions can be analyzed by reading the code(s) reproduced by this warning light. For example, if the warning light blinks _|¯|_|¯|__|¯|_ this means code 21, indicating trouble with the Oxygen Sensor.

OUTPUT OF DIAGNOSTIC CODES

To obtain an output of diagnostic codes, proceed as follows:

1. Initial conditions

(a) Battery voltage 11V or more
(b) Throttle valve fully closed (throttle position sensor IDL points closed)
(c) Transmission in neutral position
(d) Accessories switched OFF
(e) Engine at normal operating temperature

2. Turn the ignition switch to ON. Do not start the engine.

3. Using SST (09843-18020) [or a piece of plain electrical wire], connect terminals TE1 and E1 of the check connector.

4. Read the diagnostic code as indicated by the number of flashes of the "CHECK" engine warning light.

DIAGNOSTIC CODES (3S-GTE)

Code no.	System	Diagnosis	Trouble area	See page
-	normal	This appears when none of the other codes are identified.	-	-
12	RPM signal	No NE or G signal to ECU within 2 seconds after engine has been cranked.	distributor circuit distributor starter signal circuit ECU	IG-4
13	RPM signal	No NE signal to ECU when engine speed is above 1000 rpm.	distributor ignition coil distributor ECU	-
14	Ignition signal	No IGF signal to ECU 8 - 11 times in succession.	igniter and ignition coil circuit igniter and ignition coil ECU	FI-45
21	Oxygen sensor signal	During air-fuel ratio feedback correction, voltage output from the oxygen sensor does not exceed a set value on the lean side and the rich side continuously for a certain period.	oxygen sensor circuit oxygen sensor ECU	FI-50
21	Oxygen sensor heater circuit	Open or short circuit in oxygen sensor heater.	oxygen sensor heater circuit oxygen sensor heater ECU	FI-50
22	Water temp. sensor signal	Open or short circuit in water temp. sensor signal (THW).	water temp. sensor circuit water temp. sensor ECU	FI-43
24	Intake air temp. sensor signal	Open or short circuit in intake air temp. sensor signal (THA).	intake air temp. sensor circuit intake air temp. sensor ECU	FI-42
25	Air-fuel ratio lean malfunction	When air-fuel ratio feedback correction valve or adaptive control value continued at the upper (lean) or lower (rich) limit renewed for a certain period of time. When air-fuel ratio feedback correction value or adaptive control value feedback frequency is abnormally high during feedback condition. Open or short circuit in oxygen sensor signal.	injector circuit injector oxygen sensor circuit ECU fuel line pressure Air Flow Meter Air intake system ignition system	-
26	Air-fuel ratio rich malfunction		injector circuit injector fuel line pressure cold start injector Air Flow Meter ECU	-
31	Air Flow Meter signal	Open circuit in VC signal or short circuit between VC and E2 when idle contacts are closed.	Air Flow Meter circuit Air Flow Meter ECU	FI-40
32	Air Flow Meter signal	Open circuit in E2 or short circuit between VC and VS.	Air Flow Meter circuit Air Flow Meter ECU	FI-40
34	Turbocharging pressure signal	Excessive turbocharging pressure.	turbocharger turbocharging pressure sensor circuit turbocharging pressure sensor ECU	-
35	Turbocharging Pressure Sensor signal	Open or short circuit in turbocharging sensor pressure sensor signal (PIM).	Turbocharging pressure sensor circuit Turbocharging pressure sensor ECU	FI-48
41	Throttle Position Sensor signal	Open or short circuit in throttle position sensor signal (VTA).	throttle position sensor circuit throttle position sensor ECU	FI-38
42	Vehicle Speed Sensor signal	No SPD signal for 8 seconds when engine speed is between 2500 rpm and 5000 rpm and coolant temp. is below 80°C (176°F) except when racing the engine.	Vehicle speed sensor circuit Vehicle speed sensor ECU	-
43	Starter signal	No STA signal to ECU until engine speed reaches 800 rpm with vehicle not moving.	Ignition switch circuit Ignition switch ECU	FI-44
52	Knock Sensor signal	Open or short circuit in knock sensor signal (KNK).	Knock sensor circuit Knock sensor ECU	-
53	Knock Control signal in ECU	Knock control in ECU faulty.	ECU	-
71	EGR malfunction (CALIF. only)	EGR gas temp. below predetermined level for during EGR control.	EGR system (EGR valve, EGR hose etc.) EGR gas temp. sensor circuit EGR gas temp. sensor EGR control VSV EGR control VSV circuit ECU	FI-51

DIAGNOSTIC CODES (5S-FE)

Code no.	System	Diagnosis	Trouble area	See page
-	normal	This appears when none of the other codes are identified.	-	-
12	RPM signal	No NE or G signal to ECU within several seconds after engine is cranked.	distributor circuit distributor starter signal circuit ECU	IG-4
13	RPM signal	No NE signal to ECU when engine speed is above 1000 rpm and within 50msec. after engine is cranked.	distributor circuit distributor ECU	-
14	Ignition signal	No IGF signal to ECU 4 - 5 times in succession.	ignition circuit (+B, IGT, IGF) igniter ECU	FI-62 or FI-79
21	Oxygen sensor signal	During air-fuel ratio feedback correction, voltage output from the oxygen sensor does not exceed a set value on the lean side and the rich side continuously for a certain period.	oxygen sensor circuit oxygen sensor ECU	FI-66 or FI-83
22	Water temp. sensor signal	Open or short circuit in water temp. sensor signal (THW).	water temp. sensor circuit water temp. sensor ECU	FI-60 or FI-77
24	Intake air temp. sensor signal	Open or short circuit in intake air temp. sensor signal (THA).	intake air temp. sensor circuit intake air temp. sensor ECU	FI-59 or FI-76
25	Air-fuel ratio lean malfunction	When FAF (air fuel compensation ratio) is not removed for a certain period during feedback condition. When marked variation is detected in engine revolutions for each cylinder during idle switch on and feedback condition. Open or short circuit in oxygen sensor signal.	injector circuit injector oxygen sensor circuit oxygen sensor ECU fuel line pressure vacuum sensor water temp. sensor ignition system ECU	-
26	Air-fuel ratio rich malfunction		injector circuit injector fuel line pressure cold start injector vacuum sensor water temp. sensor ECU	-
27*	sub-oxygen sensor signal	Open or short circuit in sub-oxygen sensor signal (OX2).	sub-oxygen sensor circuit sub-oxygen sensor ECU	FI-66 or FI-83
31	Vacuum sensor signal	Open or short circuit in vacuum sensor signal.	vacuum sensor circuit vacuum sensor ECU	FI-57 or FI-74
41	Throttle Position Sensor signal	(M/T) IDL and PSW signals being output simultaneously for several seconds. (A/T) Open or short circuit in throttle position sensor signal (VTA).	throttle position sensor circuit throttle position sensor ECU	FI-56 or FI-72
42	Vehicle Speed Sensor signal	(M/T) No pulse is input from the speed sensor (SP1) bult into the meter during input of a 4-pulse signal from the vehicle speed sensor (SP2) on the transmission (A/T) No SPD signal for several seconds when engine speed is between 2300 rpm and 5500 rpm and coolant temp. is below 80°C (176°F) except when racing the engine.	Vehicle speed sensor circuit Vehicle speed sensor ECU	-
43	Starter signal	No STA signal to ECU until engine speed reaches 800 rpm with vehicle not moving.	Ignition switch circuit Ignition switch ECU	FI-61 or FI-78
71	EGR malfunction	EGR gas temp. below 70°C during EGR operation.	EGR system (EGR valve, EGR hose etc.) EGR gas temp. sensor circuit EGR gas temp. sensor BVSV for EGR BVSV for EGR circuit ECU	FI-67 or FI-84

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