Starting Problems With Hot Engine Toyota1.6 1999

[Jorgen]

At first the car refused to start when hot, after it had cooled down for 30-45 min. it started without problems. The startermotor is turning the engine without any problems. The latest development now is, that the car stops after 5 to 10 miles. Again it starts after 30-45 min. The yellow engine sign is on. I have checked the coolant temp. sensor on the hose connection point. Also the airfilter sensor is ok. According to my rep. handbook (Haynes) there is another coolant temp. sensor somewhwere else on the engine. but I have nor been able to locate it.

[Jorgen]

The car in question is an Avensis 1999 1.6 petrol. There is some doubt about the read-out of the trouble-codes. Does anyone know if the reading is in Flash, or in OBD2. The car is fitted with the 16 pin OBD2 plug, but some other suggest that the reading could be in Flash on the 99 model.

[Avensis luna 03]

See below re Carina with relevant changes for the Avensis up to 2001.

CHECK ENGINE LIGHT

Turn ignition on. The "CHECK ENGINE" light will activate with

ignition on and engine not running. Start engine and note that light

is not activated. If light remains activated, a system malfunction or

abnormality exists.

RETRIEVING TROUBLE CODES

1) Ensure Battery voltage is greater than 11 volts and

throttle valve is fully closed. Place transmission or transaxle in

Neutral and turn off all accessory switches.

2) To enter diagnostic mode, turn ignition on. DO NOT start

engine. Install jumper wire between terminals of engine check

connector. (Pins 4 and 13 on the Avensis i.e. Pin 4 from the left on the top row and pin 5 from the left on the bottom row) You must get this right or you risk damage to the ECU or other components, you do this at your own risk.

3) Count number of flashes from "CHECK ENGINE" light. If

system is operating properly (with no codes), "CHECK ENGINE" light

will blink continuously and evenly.

4) On all models, a code will be identified by a .5 second

flash on and off for the first number. A 1.5 second pause will occur

followed by the second number. See Fig. 10.

5) If more than one code is stored, a 2.5 second pause willoccur prior to the flashing of the second code. Once all codes have

been displayed, a 4.5 second pause will occur and code(s) will repeat.

7) On all models, trouble codes are given from smallest value

in order to largest value. After code(s) are retrieved, remove jumper

wire to exit diagnostic mode.

8) Compare trouble code to that listed to locate probable

cause. See appropriate TROUBLE CODE IDENTIFICATION and TROUBLE CODES &

PROBABLE CAUSE tables.

CAUTION: Ensure trouble codes are cleared after performing repair.

Road test and recheck that trouble code does not exist.

Clearing Trouble Codes

1) After repairs are performed, clear ECU memory of all

stored trouble codes. To clear memory, turn ignition off and remove

EFI 15 Amp fuse from fuse block for 30 seconds or more.

2) Fuse may require to be removed longer depending on the

ambient temperature. Replace fuse and exit diagnostic mode. Trouble

codes can also be cleared by disconnecting vehicle Battery. However,

other memory functions (clock, etc.), will need to be reset.

Fig. 10: Example of Trouble Codes

Courtesy of Toyota Motor Sales, U.S.A., Inc.

SYSTEM TESTING 1) If trouble codes exist and diagnostic circuit check has

been performed, compare code with appropriate code chart for circuits

and components associated with trouble code(s). Trouble code flow

charts are arranged in alphabetical order by each model. A test No.

has been assigned each chart. The test No. and trouble code are in

numerical order for each model. All ECU pin identifications are at end

of TROUBLE CODES & PROBABLE CAUSE charts.

2) If no code is present, circuit checking is necessary. Each

model has an ECU PIN VOLTAGE TEST table after DIAGNOSTIC CIRCUIT CHECK

flow chart. DIAGNOSTIC CIRCUIT CHECK flow chart is the first flow

chart on each model. Using ECU PIN VOLTAGE TEST table, check

appropriate circuits using the test No. in the right column of the

appropriate table.

3) Component testing will also be necessary. All component

testing available from manufacturer and pertaining to CEC, follow the

CEC flow charts. For components not covered, see appropriate article

in FUEL or DISTRIBUTORS & IGNITION SYSTEMS.

TROUBLE CODE I.D.

TROUBLE CODE IDENTIFICATION

Code No. Circuit Affected

No Code .................................... System Normal

11 .............................................. ECU (B+)

12 & 13 ....................................... RPM Signal

14 ....................................... Ignition Signal

21 .................................. Oxygen Sensor Signal

22 ........................... Coolant Temp. Sensor Signal

23 ........................ Intake Air Temp. Sensor Signal

24 ........................ Intake Air Temp. Sensor Signal

25 (1) ............................. Lean Air/Fuel Mixture

26 (1) ............................. Rich Air/Fuel Mixture

31 .................................. Airflow Meter Signal

32 .................................. Airflow Meter Signal

(2) HAC Sensor Signal

34 (2) ............................. Turbocharger Pressure

35 (3) ............................. Turbocharger Pressure

41 ....................... Throttle Position Sensor Signal

42 ........................... Vehicle Speed Sensor Signal

43 ........................................ Starter Signal

51 ......................................... Switch Signal

52 (4) ............................... Knock Sensor Signal

53 (4) ........................ Knock Sensor Control (ECU)

54 (3) ............................ Intercooler ECU Signal

71 (5) ............................ EGR System Malfunction

(1) - Only applicable to 3S-GE and 4WD models.

(2) - Only applicable to 4WD models.

(3) - Only applicable to 4WD models.

(4) - Only applicable to 4WD models.

(5) - Only applicable to 3S-GE and Calif. applications of

4WD models.

11 ............................ Main Relay and/or Circuit,

Ignition Switch and/or Circuit, ECU

12 ....... Distributor and/or Circuit, Starter Signal, ECU

13 ....................... Distributor and/or Circuit, ECU

14 ............ Ignition Coil, Ignitor and/or Circuit, ECU

21 ..................... O2 Sensor and/or O2 Heater Signal

and/or Circuit, ECU

22 .............. Coolant Temp. Sensor and/or Circuit, ECU

24 ............... Intake Air Temp. Sensor or Circuit, ECU

25 (1) ........ Injector and/or Circuit, O2 Sensor and/or,

Circuit, Fuel Line Pressure, Airflow Meter,

Coolant Temp. Sensor, Ignition System, ECU

26 (1) ...... Injector and/or Circuit, Fuel Line Pressure,

Cold Start Injector, Airflow Meter,

Coolant Temp. Sensor, ECU

31 ..................... Airflow Meter and/or Circuit, ECU

34 (2) ...................... Turbo, Turbo Pressure Sensor

and/or Circuit, ECU

35 (2) ............. Turbo Pressure Sensor and/or Circuit,

Airflow Meter, ECU, Intercooler

41 .......... Throttle Position Sensor and/or Circuit, ECU

42 ...................... Speed Sensor and/or Circuit, ECU

43 ................... Ignition Switch and/or Circuit, ECU

51 ............... Throttle Position Sensor and/or Circuit

A/C Switch Circuit, A/C Amplifier, ECU

Neutral/Start Switch and/or Circuit,

Accelerator Pedal and/or Cable

52 (3) ...................... Knock Sensor or Circuit, ECU

53 (3) ............................................... ECU

54 (4) ................. Intercooler, Coolant Level Sensor

and/or Circuit, Intercooler Water Pump

and/or Circuit, Intercooler ECU, ECU

71 (5) ........... EGR System, EGR Gas Temp. Sensor and/or

Circuit, BVSV for EGR and/or Circuit, ECU

(1) - 4WD & 3S-GE California models only.

(2) - On 4WD models.

(3) - On 4WD models.

(4) - On 4WD models.

(5) - 4WD California models only.

[Jorgen]

Thank you very much for a very detailed test procedure. First thing tomorrow.