Engine Controls - Tests W/codes Toyota Celica T180

INTRODUCTION

If no faults were found while performing BASIC TESTING , proceed with self-diagnostics. If no fault codes or only pass codes are present after entering self-diagnostics, proceed to TESTS W/O CODES article in the ENGINE PERFORMANCE Section for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.).

HARD FAILURES

Hard failures cause malfunction light to illuminate and remain on until problem is repaired. If light comes on and remains on (light may flash) during vehicle operation, cause of malfunction must be determined using diagnostic (code) charts. If a sensor fails, control unit will use a substitute value in its calculations to continue engine operation. In this condition, commonly known as limp-in mode, the vehicle runs but driveability will not be optimum.

INTERMITTENT FAILURES

Intermittent failures may cause CHECK ENGINE light to flicker or illuminate and go out after the intermittent fault goes away. However, the corresponding trouble code will be retained in ECU memory. If related fault does not reoccur within a certain time frame, related trouble code will be erased from ECU memory. Intermittent failures may be caused by a sensor, connector or wiring related problems. See INTERMITTENTS in TESTS W/O CODES article in the ENGINE PERFORMANCE Section.

Scheme 28

Scheme 29

1. Before retrieving codes, verify CHECK ENGINE light comes on with ignition on and engine off. The CHECK ENGINE light should go off when engine is started. If CHECK ENGINE light does not come on, see appropriate DIAGNOSTIC CIRCUIT CHECK under CODE CHARTS. If light remains on, system has detected a malfunction or abnormality.
2. Ensure battery voltage is greater than 11 volts and charging system is okay. Engine should be at normal operating temperature.
3. Apply parking brake. Shift transaxle to Neutral (M/T) or Park (A/T). Turn A/C and all accessories off. Close throttle valve.
4. Turn ignition on with engine off. Install jumper wire between terminals TE1 (or T) and E1 in engine check connector. (Scheme 28)and (Scheme 29).
5. Count number of flashes from CHECK ENGINE light. If system is operating properly (with no codes), CHECK ENGINE light will flash continuously and evenly. (Scheme 29) NOTE: If CHECK ENGINE light will not flash diagnostic codes, see appropriate DIAGNOSTIC CIRCUIT CHECK under «CODE CHARTS»(/toyota/celica/t180-1989-1993/remont/testing-diagnostics/#engine-controls-tests-wcodes__code-charts).
6. If code exists, digits of each code will flash at 1/2-second intervals, with a 1 1/2-second pause between first and second digits. (Scheme 29)
7. If more than one code is stored, a 2 1/2-second pause will occur before next code is flashed. Once all codes are displayed, a 4 1/2-second pause will occur then code(s) will be repeated.
8. Codes are displayed from the smallest to largest code. After codes are retrieved, remove jumper wire to exit diagnostic mode.

NOTES ON CODES

1. No other code will appear with Code 11.
2. When Codes, 25, 26, 27 and 71 initially happen, they will be temporarily stored in ECU memory, but CHECK ENGINE light will not come on. The second time code is detected, CHECK ENGINE light will then come on. This is referred to as the 2 trip detection logic.
3. After malfunction is repaired, CHECK ENGINE light will go off, but codes (except 51 and 53) will remain in ECU memory until code is cleared.

CLEARING CODES

1. After repairs are performed, clear ECU memory of all stored codes. To clear memory, turn ignition off. Remove EFI (15 amp) fuse from main fuse block in engine compartment fuse/relay box for approximately 30 seconds or more.
2. Depending on ambient temperature, fuse may need to be removed for more than 30 seconds. Replace fuse and exit diagnostic mode. Codes can also be cleared by disconnecting vehicle battery. However, other memory functions (clock, radio, etc.) will need to be reset.

ECU LOCATION

ECU is located at bottom center of dash, in front of console.

SUMMARY

If no hard fault codes (or only pass codes) are present, driveability symptoms exist or intermittent codes exist, proceed to TESTS W/O CODES article in the ENGINE PERFORMANCE Section for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures.

SELF-DIAGNOSTICS

Note. Code diagnostic hints table may be used to determine a common cause for a code to be set.

CODE DIAGNOSTIC HINTS

CODE IDENTIFICATION

CODE IDENTIFICATION

CODE CHARTS

Note. All schematics and diagnostic flow charts are courtesy of Toyota Motor Sales, U.S.A., Inc.

ECU TERMINAL IDENTIFICATION

Scheme 30

Scheme 31

Scheme 32

Scheme 33

Diagnostic Circuit Check Schematic. Scheme 34

Diagnostic Circuit Check Flow Chart. Scheme 35

TEST NO. 1 - ECU POWER SOURCE

TEST NO. 1-ECU POWER SOURCE TROUBLE

Test No. 1 Schematic ECU Power Source. Scheme 36

Test No. 1 Flow Chart ECU Power Source. Scheme 37

TEST NO. 2 - ECU (+B) CIRCUIT

TEST NO. 2-ECU (+B) CIRCUIT TROUBLE

Test No. 2 Schematic ECU (+B) Circuit. Scheme 38

Test No. 2 Flow Chart ECU (+B) Circuit. Scheme 39

CODE 12, 13 - RPM SIGNAL

Code 12 is caused by loss of signal "G2", "G1", or "NE" (3S-GTE) or "G" or "NE" (all others) from distributor to ECU for at least 2 seconds after starter signal is received at ECU. Ensure starter signal exists at ECU. See TEST NO. 10 OR CODE 43.

Code 13 is caused by loss of "NE" signal from distributor to ECU when engine RPM exceeds 1000 RPM.

Note. Diagnostic chart not available from manufacturer.

CODE 14/TEST NO. 3 - IGNITION SIGNAL

Note. To check ignition system components, see I - SYS/COMP TESTS article in the ENGINE PERFORMANCE Section.

CODE 14/TEST NO. 3-IGNITION SIGNAL TROUBLE

CODE 14/TEST NO. 3-IGNITION SIGNAL TROUBLE

Code 14/Test No. 3 Schematic (3S-GTE & 5S-FE) Ignition Signal. Scheme 40

Code 14/Test No. 3 Schematic (4A-FE) Ignition Signal. Scheme 41

Code 14/Test No. 3 Flow Chart (All Engines) Ignition Signal. Scheme 42

CODE 21, 27/TEST NO. 4 - OXYGEN SENSOR SIGNAL

Note. Code 27 applies to 5S-FE only.

Code 21/Test No. 4 Schematic (3S-GTE) Oxygen Sensor Signal. Scheme 43

Code 21/Test No. 4 Schematic (4A-FE) Oxygen Sensor Signal. Scheme 44

Code 21, 27/Test No. 4 Schematic (5S-FE) Oxygen Sensor Signal. Scheme 45

Code 21/Test No. 4 Flow Chart (3S-GTE) Oxygen Sensor Signal. Scheme 46

Code 21, 27/Test No. 4 Flow Chart (4A-FE & 5S-FE) Oxygen Sensor Signal. Scheme 47

CODE 22/TEST NO. 5 - COOLANT TEMPERATURE SENSOR SIGNAL

Note. Water temperature sensor is also referred to as coolant temperature sensor.

CODE 22/TEST NO. 5-CTS SENSOR SIGNAL TROUBLE

CODE 22/TEST NO. 5-CTS SENSOR SIGNAL TROUBLE

Code 22/Test No. 5 Schematic Coolant Temperature Sensor Signal. Scheme 48

Code 22/Test No. 5 Flow Chart Coolant Temperature Sensor Signal. Scheme 49

CODE 24/TEST NO. 6 - INTAKE AIR TEMPERATURE SENSOR SIGNAL

CODE 24/TEST NO. 6-IAT SENSOR SIGNAL TROUBLE

CODE 24/TEST NO. 6-IAT SENSOR SIGNAL TROUBLE

CODE 24/TEST NO. 6-IAT SENSOR SIGNAL TROUBLE

Code 24/Test No. 6 Schematic (3S-GTE) Intake Air Temperature Sensor Signal. Scheme 50

Code 24/Test No. 6 Schematic (4A-FE & 5S-FE) Intake Air Temperature Sensor Signal. Scheme 51

Code 24/Test No. 6 Flow Chart (3S-GTE) Intake Air Temperature Sensor Signal. Scheme 52

Code 24/Test No. 6 Flow Chart (4A-FE & FS-FE) Intake Air Temperature Sensor Signal. Scheme 53

Probable Causes

1. Airflow Meter
2. Air Intake System
3. Coolant Temperature Sensor
4. ECU
5. Fuel Pressure
6. Ignition System
7. Injector Circuit or Injector
8. Oxygen Sensor or Sensor Circuit
9. Vacuum Sensor

Note. Diagnostic chart not available from manufacturer.

1. Airflow Meter
2. Cold Start Injector
3. Coolant Temperature Sensor
4. ECU
5. Fuel Pressure
6. Injector Circuit or Injector
7. Oxygen Sensor or Sensor Circuit
8. Vacuum Sensor Circuit

Note. Diagnostic chart not available from manufacturer.

CODE 31/TEST NO. 7 - VACUUM SENSOR SIGNAL (4A-FE & 5S-FE)

CODE 31/TEST NO. 7-VACUUM SENSOR SIGNAL TROUBLE

Code 31/Test No. 7 Schematic (4A-FE & 5S-FE) Vacuum Sensor Signal. Scheme 54

Code 31/Test No. 7 Flow Chart (4A-FE & 5S-FE) Vacuum Sensor Signal. Scheme 55

CODE 31, 32/TEST NO. 7 - AIRFLOW METER SIGNAL (3S-GTE)

CODE 31,32/TEST NO. 7-AIRFLOW METER SIGNAL TROUBLE

Code 31, 32/Test No. 7 Schematic (3S-GTE) Airflow Meter Signal. Scheme 56

Code 31, 32/Test No. 7 Flow Chart (3S-GTE) Airflow Meter Signal. Scheme 57

CODE 34, 35/TEST NO. 8 - TURBOCHARGER PRESSURE (3S-GTE)

CODE 34, 35/TEST NO. 8-TURBOCHARGER PRESSURE TROUBLE

Code 34, 35/Test No. 8 Schematic (3S-GTE) Turbocharger Pressure. Scheme 58

Code 34, 35/Test No. 8 Flow Chart (3S-GTE) Turbocharger Pressure. Scheme 59

CODE 41/TEST NO. 9 - THROTTLE POSITION SENSOR SIGNAL (3S-GTE)

CODE 41/TEST NO. 8-TPS SENSOR SIGNAL TROUBLE

Code 41/Test No. 9 Schematic (3S-GTE) Throttle Position Sensor Signal. Scheme 60

Code 41/Test No. 9 Flow Chart, Terminals IDL - E2 (3S-GTE) Throttle Position Sensor Signal. Scheme 61

Code 41/Test No. 9 Flow Chart, Terminals VC - E2 (3S-GTE) Throttle Position Sensor Signal. Scheme 62

Code 41/Test No. 9 Flow Chart, Terminals VTA - E2 (3S-GTE) Throttle Position Sensor Signal. Scheme 63

CODE 41/TEST NO. 9 - THROTTLE POSITION SENSOR SIGNAL (4A-FE)

CODE 41/TEST NO. 9-TPS SENSOR SIGNAL TROUBLE

Code 41/Test No. 9 Schematic (4A-FE) Throttle Position Sensor Signal. Scheme 64

Code 41/Test No. 9 Flow Chart (4A-FE) Throttle Position Sensor Signal. Scheme 65

5S-FE Without Electronically Controlled Transaxle (ECT)

Note. The following table is for models WITHOUT Electronically Controlled Transaxle (ECT).

CODE 41/TEST NO. 8-TPS SENSOR SIGNAL TROUBLE (5S-FE WITHOUT ECT)

Code 41/Test No. 9 Schematic (5S-FE W/O ECT) Throttle Position Sensor Signal. Scheme 66

Code 41/Test No. 9 Flow Chart (5S-FE W/O ECT) Throttle Position Sensor Signal. Scheme 67

5S-FE With Electronically Controlled Transaxle (ECT)

Note. The following table is for models WITH Electronically Controlled Transaxle (ECT).

CODE 41/TEST NO. 8-TPS SENSOR SIGNAL TROUBLE (5S-FE WITH ECT)

Code 41/Test No. 9 Schematic (5S-FE W/ECT) Throttle Position Sensor Signal. Scheme 68

Code 41/Test No. 9 Flow Chart Terms. VCC - E2 (5S-FE W/ECT) Throttle Position Sensor Signal. Scheme 69

Code 41/Test No. 9 Flow Chart Terms. VTA - E2 (5S-FE W/ECT) Throttle Position Sensor Signal. Scheme 70

1. Vehicle Speed Sensor or Sensor Circuit
2. ECU

Note. Diagnostic chart not available from manufacturer.

CODE 43/TEST NO. 10 - STARTER SIGNAL

CODE 43/TEST NO. 10-STARTER SIGNAL TROUBLE

Code 43/Test No. 10 Schematic Starter Signal. Scheme 71

Code 43/Test No. 10 Component Diagram Starter Signal. Scheme 72

Code 43/Test No. 10 Flow Chart Starter Signal. Scheme 73

1. A/C Switch or Switch Circuit
2. Accelerator Pedal or Cable
3. Neutral/Start Switch or Switch Circuit
4. Throttle Position Sensor IDL Circuit
5. ECU

To check A/C switch signal, use the following procedure.

CODE 51/TEST NO. 11-SWITCH SIGNAL TROUBLE

Code 51/Test No. 11 Schematic (3S-GTE) Switch Signal. Scheme 74

Code 51/Test No. 11 Flow Chart (3S-GTE) Switch Signal. Scheme 75

CODE 51/TEST NO. 11-SWITCH SIGNAL TROUBLE

Code 51/Test No. 11 Schematic (4A-FE & 5S-FE) Switch Signal. Scheme 76

Code 51/Test No. 11 Flow Chart (4A-FE & 5S-FE) Switch Signal. Scheme 77

1. Knock Sensor or Sensor Circuit
2. ECU

Note. Diagnostic chart is not available from manufacturer.

1. ECU

Note. Diagnostic chart not available from manufacturer.

Code 71/Test No. 12 Schematic EGR System Malfunction. Scheme 78

Code 71/Test No. 12 Flow Chart EGR System Malfunction. Scheme 79

TEST NO. 13 - INJECTOR CIRCUIT

TEST NO. 13-INJECTOR CIRCUIT TROUBLE

Test No. 13 Schematic (3S-GTE) Injector Circuit. Scheme 80

Test No. 13 Component Diagram (3S-GTE) Injector Circuit. Scheme 81

Test No. 13 Flow Chart (3S-GTE) Injector Circuit. Scheme 82

TEST NO. 13-INJECTOR CIRCUIT TROUBLE

Test No. 13 Schematic (4A-FE & 5S-FE) Injector Circuit. Scheme 83

Test No. 13 Flow Chart (4A-FE & 5S-FE) Injector Circuit. Scheme 84

TEST NO. 14 - IDLE SPEED CONTROL CIRCUIT

TEST NO. 14-IDLE SPEED CONTROL CIRCUIT TROUBLE

Test No. 14 Schematic (3S-GTE) Idle Speed Control Circuit. Scheme 85

Test No. 14 Component Diagram (3S-GTE) Idle Speed Control Circuit. Scheme 86

Test No. 14 Flow Chart (3S-GTE) Idle Speed Control Circuit. Scheme 87

TEST NO. 14-IDLE SPEED CONTROL CIRCUIT TROUBLE

Test No. 14 Schematic (5S-FE) Idle Speed Control Circuit. Scheme 88

Test No. 14 Component Diagram (5S-FE) Idle Speed Control Circuit. Scheme 89

Test No. 14 Flow Chart (5S-FE) Idle Speed Control Circuit. Scheme 90

TEST NO. 15 - CHECK ENGINE LIGHT CIRCUIT

TEST NO. 14-CHECK ENGINE LIGHT CIRCUIT TROUBLE

Test No. 15 Schematic Check Engine Light Circuit. Scheme 91

Test No. 15 Flow Chart Check Engine Light Circuit. Scheme 92

See also:
• CODE CHARTS
• 12
• 14
• 21
• 22
• 24
• 25
• 31 (1.6L, 2.2L)
• 31 (2.0L)
• 34
• 41 (1.6L)
• 43