Engine Controls - Tests W/codes Toyota Camry V30

INTRODUCTION

If no faults were found while performing BASIC DIAGNOSTIC PROCEDURES, 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 this section for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.).

HARD FAILURES

Hard failures cause CHECK ENGINE 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 problem. See INTERMITTENTS in TESTS W/O CODES article in this section.

RETRIEVING CODES

Note. If CHECK ENGINE light will not flash diagnostic codes, see appropriate DIAGNOSTIC CIRCUIT CHECK under CODE CHARTS.

Scheme 1

Scheme 2

Note. Camry has a Normal Mode and a Test Mode for retrieving codes. To prevent damage to ECU, connect only specified terminals.

Scheme 3

1. Before retrieving codes, verify CHECK ENGINE light comes on with ignition on and engine off. 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 and place transmission in Park. Turn A/C and all accessories off. Throttle valve must be closed.
4. To enter normal mode, turn ignition on with engine off. Install jumper wire between terminals TE1 and E1 in Toyota Diagnostic Communication Link (TDCL), located under left side of instrument panel. (Scheme 3)
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 2) NOTE: If CHECK ENGINE light will not flash diagnostic codes, see appropriate DIAGNOSTIC CIRCUIT CHECK under CODE CHARTS.
6. If a code exists, digits of code will flash at 1/2-second intervals, with a 1 1/2-second pause between first and second digits. (Scheme 2)
7. If more than one code is stored, a 2 1/2-second pause will occur before next code is flashed. Once all fault codes are displayed, a4 1/2-second pause will occur, then code(s) will be repeated.
8. Codes are displayed from lowest to highest code number. After codes are retrieved, remove jumper wire to exit diagnostic mode.

Note. Test mode can be used to check for codes when operating vehicle. This will simulate conditions in which codes were set.

Test Mode

1. Before retrieving codes, verify CHECK ENGINE light comes on with ignition on and engine off. 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 and place transmission in Park. Turn air conditioner and all accessories off. Throttle valve must be closed.
4. To enter test mode, install jumper wire between terminals TE2 and E1 terminals in Toyota Diagnostic Communication Link (TDCL), located under left side of instrument panel. (Scheme 3)
5. Turn ignition on. Test mode is operational if CHECK ENGINE light flashes with key on and engine off.
6. Start engine. Drive vehicle at a speed greater than 10 MPH. The ECU will set a Code 42 and 43 if vehicle is not driven. Try to simulate the driveability complaint. Stop vehicle, but DO NOT turn engine off.
7. Using jumper wire, connect terminals TE1 and E1 of TDCL. (Scheme 3) Count number of flashes from CHECK ENGINE light. If system is operating properly (no codes exist), CHECK ENGINE light will flash continuously and evenly in 1/4 second increments. (Scheme 2)
8. If a code exists, digits of code will flash at 1/2-second intervals, with a 1 1/2-second pause between first and second digits. (Scheme 2)
9. If more than one code is stored, a 2 1/2-second pause will occur before next code is flashed. Once all fault codes are displayed, a4 1/2-second pause will occur, then code(s) display will be repeated.
10. Codes are displayed from the lowest to highest number. After codes are retrieved, remove jumper wire to exit diagnostic mode. See NOTES ON CODES. For extra help in understanding code diagnostics, see «CODE DIAGNOSTIC HINTS»(/toyota/camry/v30-1990-1994/remont/testing-diagnostics/#engine-controls-tests-wcodes) table.

NOTES ON CODES

1. No other code will appear with Code 11.
2. When Codes 21 (Camry V6), 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. When in Normal Mode, CHECK ENGINE light will go off once malfunction is repaired. Fault codes (except for Codes 16, 43, 51 and 53) will remain in ECU memory until codes are cleared.
4. When in Test Mode, codes will remain in ECU memory as long as ignition remains on, even if malfunction is repaired (except for Codes 43, 51 and 53). Once ignition is turned off, codes will be erased from ECU memory. During Test Mode, if vehicle is not driven at a speed greater than 10 MPH, ECU will set a Code 42 and 43.

CLEARING CODES

1. After repairs are performed, clear ECU memory of all stored codes. To clear memory, turn ignition off. Remove proper fuse from main fuse block for approximately 30 seconds or more. See «MAIN FUSE BLOCK LOCATION»(/toyota/camry/v30-1990-1994/remont/testing-diagnostics/#engine-controls-tests-wcodes) table. See «CLEARING CODES»(/toyota/camry/v30-1990-1994/remont/testing-diagnostics/#engine-controls-tests-wcodes) table for proper fuse to be removed.
2. Depending on ambient temperature, fuse may need to be removed for more than 30 seconds. (Colder temperatures require longer time.) Install fuse and enter diagnostic mode to check for any codes that may not have cleared.
3. Codes can also be cleared by disconnecting vehicle battery. However, other memory functions (clock, radio, alarm, seats, etc.) will need to be reset.

MAIN FUSE BLOCK LOCATION

CLEARING CODES

ECU LOCATION

ECU LOCATION

SUMMARY

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

Note. To determine a common cause for a code to be set, see CODE DIAGNOSTIC HINTS table.

CODE DIAGNOSTIC HINTS

TROUBLE CODE IDENTIFICATION CHARTS

CAMRY CODE IDENTIFICATION

CODE CHARTS DIAGNOSTIC CIRCUIT CHECK

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

ECU Connector Terminal Identification (5S-FE With M/TX). Scheme 4

ECU Connector Terminal Identification (5S-FE With A/TX). Scheme 5

ECU Connector Terminal Identification (3VZ-FE). Scheme 6

DIAGNOSTIC CIRCUIT CHECK

Diagnostic Circuit Check Schematic (5S-FE 4-Cylinder). Scheme 7

Diagnostic Circuit Check Flow Chart. Scheme 8

Diagnostic Circuit Check Schematic (3VZ-FE V6). Scheme 9

TEST NO. 1-ECU POWER SOURCE

TEST NO. 1-ECU POWER SOURCE TROUBLE

Test No. 1 Schematic ECU Power Source. Scheme 10

Test No. 1 Flow Chart ECU Power Source. Scheme 11

TEST NO. 2-ECU (+B) CIRCUIT

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

Test No. 2 Schematic (5S-FE) ECU (+B) Circuit. Scheme 12

Test No. 2 Flow Chart (5S-FE) ECU (+B) Circuit. Scheme 13

Test No. 2 Schematic (3VZ-FE) ECU (+B) Circuit. Scheme 14

Test No. 2 Flow Chart-Terminals BATT - E1 (3VZ-FE) ECU (+B) Circuit. Scheme 15

Test No. 2 Flow Chart-Terminals IG SW - E1 (3VZ-FE) ECU (+B) Circuit. Scheme 16

Test No. 2 Flow Chart-Terminals M-REL - E1 (3VZ-FE) ECU (+B) Circuit. Scheme 17

Test No. 2 Flow Chart-Terminals +B (+B) - E1 (3VZ-FE) ECU (+B) Circuit. Scheme 18

CODE 12, 13-RPM SIGNAL

Code 12 is caused by loss of "G" or "NE" signal from distributor to ECU for at least 2 seconds after starter signal is received at ECU. Check distributor and ignition system components. See I - SYS/COMP TESTS article in this section. Ensure starter signal (STA) exists at ECU. See CAMRY TEST NO. 9 OR CODE 43.

Code 13 is caused by loss of "NE" signal from distributor to ECU when engine RPM exceeds 1500 RPM. Check distributor and ignition system components. See I - SYS/COMP TESTS article in this section.

Note. Diagnostic chart for Code 12 or 13 is not available from manufacturer.

CODE 14/TEST NO. 3 - IGNITION SIGNAL

Note. To check ignition system components, see I - SYS/COMP TESTS article in this section.

CODE 14/TEST NO. 3-IGNITION SIGNAL TROUBLE

Code 14/Test No. 3 Schematic (5S-FE) Ignition Signal. Scheme 19

Code 14/Test No. 3 Flow Chart Ignition Signal. Scheme 20

Code 14/Test No. 3 Schematic (3VZ-FE) Ignition Signal. Scheme 21

Code 21, 27/Test No. 4 Schematic Oxygen Sensor Signal. Scheme 22

Code 21, 27/Test No. 4 Flow Chart Oxygen Sensor Signal. Scheme 23

Code 21, 27/Test No. 4 Component Diagram Oxygen Sensor Signal. Scheme 24

Code 21, 27, 28/Test No. 4 Left Oxygen Sensor Test Schematic. Scheme 25

Code 21, 27, 28/Test No. 4 Left Oxygen Sensor Test Flow Chart. Scheme 26

Code 21, 27, 28/Test No. 4 Component Diagram Left Oxygen Sensor Test. Scheme 27

Code 21, 27, 28/Test No. 4 Right Oxygen Sensor Test Schematic. Scheme 28

Code 21, 27, 28/Test No. 4 Right Oxygen Sensor Test Flow Chart. Scheme 29

Code 21, 27, 28/Test No. 4 Component Diagram Right Oxygen Sensor Test. Scheme 30

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 Schematic Coolant Temperature Sensor Signal. Scheme 31

Code 22/Test No. 5 Flow Chart Coolant Temperature Sensor Signal. Scheme 32

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

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

Code 24/Test No. 6 Schematic (5S-FE) Intake Air Temperature Sensor Signal. Scheme 33

Code 24/Test No. 6 Flow Chart Intake Air Temperature Sensor Signal. Scheme 34

Code 24/Test No. 6 Schematic (3VZ-FE) Intake Air Temperature Sensor Signal. Scheme 35

Probable Causes

1. Loose Engine Ground
2. Open E1 Circuit
3. Open Injector Circuit
4. Fuel Line Pressure (Blocked Injector)
5. Open Or Short In Oxygen Sensor Or Circuit
6. Ignition System
7. Coolant Temperature Sensor
8. Airflow Meter Or Air Intake System (3VZ-FE)
9. Vacuum Sensor (5S-FE)
10. ECU

For oxygen sensor or circuit testing, see Code 21. For injector or circuit testing, see TEST NO. 12.

Note. Diagnostic chart is not available from manufacturer.

1. Loose Engine Ground
2. Open E1 Circuit
3. Short In Injector Circuit Or Injector
4. Fuel Line Pressure (Leaking Injector)
5. Open Or Short In Cold Start Injector Or Circuit
6. Open Or Short In Oxygen Sensor Or Circuit
7. Coolant Temperature Sensor
8. Airflow Meter (3VZ-FE)
9. Vacuum Sensor (5S-FE)
10. Compression Pressure
11. ECU

For oxygen sensor or circuit testing, see Code 21. For injector or circuit testing, see TEST NO. 12.

Note. Diagnostic chart is not available from manufacturer.

CODE 31, 32/TEST NO. 7 VACUUM SENSOR SIGNAL (5S-FE)

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

Code 31, 32/Test No. 7 (5S-FE) Schematic, Vacuum Sensor Signal. Scheme 36

Code 31, 32/Test No. 7 (5S-FE) Flow Chart, Vacuum Sens Signal. Scheme 37

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

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

Code 31, 32/Test No. 7 (3VZ-FE) Schematic, Airflow Meter Signal. Scheme 38

Code 31, 32/Test No. 7 (3VZ-FE) Flow Chart, Airflow Meter Signal. Scheme 39

CODE 41/TEST NO. 8 - TPS SENSOR SIGNAL

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

CODE 41/TEST NO. 8-TPS SENSOR SIGNAL (3VZ-FE)

41/Test No. 8 Component Diagram Throttle Position Sensor Signal. Scheme 40

Code 41/Test No. 8 Schematic (W/ECT) Throttle Position Sensor Signal. Scheme 41

Code 41/Test No. 8 Flow Chart (W/ECT)-Terminals IDL - E2 Throttle Position Sensor Signal. Scheme 42

Code 41/Test No. 8 Flow Chart (W/ECT)-Terminals VC - E2 Throttle Position Sensor Signal. Scheme 43

Code 41/Test No. 8 Flow Chart (W/ECT)-Terminals VTA - E2 Throttle Position Sensor Signal. Scheme 44

1. Open Or Short In Vehicle Speed Sensor Or Circuit
2. ECU Defective

Note. Diagnostic chart is not available from manufacturer.

CODE 43/TEST NO. 9 - STARTER SIGNAL

CODE 43/TEST NO. 9-STARTER SIGNAL TROUBLE

Code 43/Test No. 9 Schematic Starter Signal. Scheme 45

Code 43/Test No. 9 Flow Chart Starter Signal. Scheme 46

Code 43/Test No. 9 Component Diagram Starter Signal. Scheme 47

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 throttle position sensor circuit, see Code 41.

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

CODE 51-SWITCH SIGNAL TROUBLE

Code 51/Test No. 10 Schematic Switch Signal. Scheme 48

Code 51/Test No. 10 Flow Chart Switch Signal. Scheme 49

1. Knock Sensor
2. Open Or Short In Knock Sensor Circuit
3. ECU Defective

Note. Diagnostic chart is not available from manufacturer.

1. ECU Defective

Note. Diagnostic chart is not available from manufacturer.

Code 71/Test No. 11 Schematic EGR System Malfunction. Scheme 50

Code 71/Test No. 11 Flow Chart EGR System Malfunction. Scheme 51

TEST NO. 12 - INJECTOR CIRCUIT

TEST NO. 12-INJECTOR CIRCUIT TROUBLE (5S-FE)

Test No. 12 Schematic (5S-FE) Injector Circuit. Scheme 52

Test No. 12 Flow Chart (5S-FE) Injector Circuit. Scheme 53

TEST NO. 12-INJECTOR CIRCUIT TROUBLE (3VZ-FE)

Test No. 12 Schematic (3VZ-FE) Injector Circuit. Scheme 54

Test No. 12 Flow Chart (3VZ-FE) Injector Circuit. Scheme 55

TEST NO. 13 - IDLE SPEED CONTROL CIRCUIT

TEST NO. 13-IDLE SPEED CONTROL CIRCUIT TROUBLE (5S-FE)

Test No. 13 Schematic (5S-FE) Idle Speed Control Circuit. Scheme 56

Test No. 13 Component Diagram (5S-FE) Idle Speed Control Circuit. Scheme 57

Test No. 13 Flow Chart (5S-FE) Idle Speed Control Circuit. Scheme 58

TEST NO. 13-IDLE SPEED CONTROL CIRCUIT TROUBLE (3VZ-FE)

Test No. 13 Schematic (3VZ-FE) Idle Speed Control Circuit. Scheme 59

Test No. 13 Flow Chart (3VZ-FE) Idle Speed Control Circuit. Scheme 60

TEST NO. 14 - CHECK ENGINE LIGHT CIRCUIT

TEST NO. 14-CHECK ENGINE LIGHT CIRCUIT TROUBLE

Test No. 14 Schematic Check Engine Light Circuit. Scheme 61

Test No. 14 Flow Chart Check Engine Light Circuit. Scheme 62

See also:
• CODE DIAGNOSTIC HINTS
• 12 & 13
• 14
• 22
• 24
• 31 (2.2L)
• 31 & 32 (3.0L)
• 41
• 43