1989 toyota 4runner tests with codes v6

�G - TESTS W/CODES - V6

�1989 Toyota 4Runner

ENGINE PERFORMANCE Toyota Self-Diagnostics - Fuel Injected

Pickup & 4Runner With 3VZ-E Engine

INTRODUCTION

If no faults were found while performing F - BASIC TESTING,proceed with G - TESTS W/CODES. If no trouble codes or only pass codesare present, proceed to H - TESTS W/O CODES for diagnosis by symptom(i.e. ROUGH IDLE, NO START, etc.).

ECU LOCATION

The ECU is located behind the right kick panel.

"HARD FAILURES"

Hard failures cause "CHECK ENGINE" light to illuminate andremain on until the malfunction is repaired. If light comes on andremains on (light may flash) during vehicle operation, cause ofmalfunction must be determined using diagnostic (code) charts. If asensor fails, control unit will use a substitute value in itscalculations to continue engine operation. In this condition, vehicleis functional, but loss of good driveability will most likely beencountered.

"INTERMITTENT FAILURES"

Intermittent failures may cause "CHECK ENGINE" light toflicker or illuminate and go out after the intermittent fault goesaway. The corresponding trouble code, however, will be retained incontrol unit memory. If related fault does not reoccur within acertain time frame, related trouble code will be erased from controlunit memory. Intermittent failures may be caused by sensor, connectoror wiring related problems. See INTERMITTENTS in H - TESTS W/O CODESsection.

CHECK ENGINE LIGHT

1) Check engine light will come on when ignition switch is in"ON" position and engine is not running. When engine is started,"CHECK ENGINE" light should go off. If light remains on while engineis running, trouble code is present. 2) If light did not come on with key on and engine off, the"CHECK ENGINE" light circuit must be checked before continuing.Perform the "DIAGNOSTIC CIRCUIT CHECK" for the particular model.Circuit checks are located with the trouble code charts.

RETRIEVING TROUBLE CODES

CAUTION: DO NOT enter self-diagnostic system until all basic engine checks (engine, fuel and spark) have been performed. See F - BASIC TESTING article in this section.

1) Verify "CHECK ENGINE" light circuit is operational. Ensurebattery voltage is above 11 volts and charging system is okay. Enginemust be at normal operating temperature. 2) Transmission/transaxle must be in Neutral or Park. Airconditioner and other accessories must be off. Throttle valve must beclosed (throttle position idle contacts closed). 3) Turn ignition switch to "ON" position with engine off.Place jumper wire across "TE1" (or "T") and "E1" terminals in enginecheck connector. See Fig. 1 or 2.

Fig. 1: Installing Engine Check Connector Jumper Wire (Pickup)Courtesy of Toyota Motor Sales, U.S.A., Inc.

Fig. 2: Installing Engine Check Connector Jumper Wire (4Runner)Courtesy of Toyota Motor Sales, U.S.A., Inc.

4) Count number of flashes from "CHECK ENGINE" light. Ifsystem is operating properly (with no codes), "CHECK ENGINE" lightwill blink continuously and evenly. See Fig. 3.

NOTE: If "CHECK ENGINE" light stays on and will not blink codes, verify battery voltage is present at "TE1" (or "T") with key on and engine off. Ensure "E1" has continuity to ground or self-diagnostics will not work. If ground ("E1") is open, jumper "TE1" (or "T") to battery ground.

5) A trouble code will be identified by a .5 second flash onand off for the first number. A 1.5 second pause will occur followedby the second number. See Fig. 3. 6) If more than one code is stored, a 2.5 second pause willoccur before second code is flashed. Once all codes have beendisplayed, a 4.5 second pause will occur and code(s) will repeat. 7) Trouble codes are given from smallest number code tolargest number code. After codes are retrieved, remove jumper wire toexit diagnostic mode.

Fig. 3: Example of Toyota Trouble CodesCourtesy of Toyota Motor Sales, U.S.A., Inc.

NOTES ON TROUBLE CODES

1) No other code will appear with code 11. 2) When the malfunction in the system is repaired, the "CHECKENGINE" light will go off but, the trouble code will remain in memoryuntil the code is cleared. 3) If trouble code 51 is still displayed after clearing theECU memory, check if A/C switch is "OFF" and throttle valve is fullyclosed. Place gearshift lever in "P" or "N". Clear trouble code again.If code will not clear, recheck switches and circuit. 4) If a malfunction occurs in test mode, the "CHECK ENGINE"light will remain on (all except code 51). ECU will erase all troublecodes when the ignition switch is turned off in test mode.

CLEARING TROUBLE CODES

1) After repairs are performed, clear ECU memory. To clearmemory, turn ignition off. Remove fuse from main fuse block for about30 seconds or more. 2) Fuse block is located in the engine compartment fuse/relaybox. See CLEARING CODES table for the appropriate fuse. 3) Fuse may be required to be removed longer, depending onthe ambient temperature. Replace fuse and exit diagnostic mode.Trouble codes can also be cleared by disconnecting vehicle battery.However, other memory functions (clock, radio, etc.), will need to bereset.

CLEARING CODES TABLE��

Application Fuse (Amperage)

Pickup/4Runner ........................ EFI (15)��

REPAIR PROCEDURE

CAUTION: Ensure trouble codes are cleared after performing repair. Road test and recheck that trouble codes do not exist.

Locate and repair cause of trouble code. See appropriateTROUBLE CODE IDENTIFICATION table. Always repair faults in order fromlowest numbered trouble code to highest numbered code. Test drivevehicle after repairs are made to ensure no new codes are set.

SUMMARY

No Codes Present, Driveability Complaint Still Present 1) If no codes are present but driveability complaint isstill present, go to H - TESTS W/O CODES article in this section. 2) Also check fuel system pressure. See "I - SYS/COMP TESTS"article in this section. 3) Circuit voltages may also be checked at the computer. See J - PIN VOLTAGES CHARTS article.

NOTE: To check voltages at ECU pin connectors, see J - PIN VOLTAGES CHARTS article in this section. For more testing information, see I - SYS/COMP TESTS article in this section.

TROUBLE CODE CHARTS - EFI MODELS

PICKUP (EXCEPT 22R), 4RUNNER TROUBLE CODE IDENTIFICATION TABLE��

Code No. System Affected Probable Cause

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

11 (1) ........ ECU (B+) ............. Ignition Switch, Main Relay or Circuit, ECU��

12 ........... RPM Signal ........ Distributor or Circuit, Starter Signal, Ignitor, ECU��

13 ........... RPM Signal ... Distributor, Ignitor or Circuit, ECU��

14 ........ Ignition Signal ............... Ignition Coil, Ignitor or Circuit, ECU��

21 .. O2 Sensor or O2 Heater Signal ..... O2 Sensor, O2 Heater Signal or Circuit, ECU��

22 ... Coolant Temp. Sensor Signal ........... Coolant Temp. Sensor or Circuit, ECU��

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

25 ....... Lean Air/Fuel Mixture ... Injector or Circuit, O2 Sensor,

O2 Sensor Circuit, Fuel Line Pressure, Airflow Meter, ECU, Air Intake System, Ignition System��

26 ...... Rich Air/Fuel Mixture ...... Inj or Circuit, Fuel Pressure, Cold Start Injector, Airflow Meter, O2 Sensor or Circuit, ECU��

27 (2) ... Sub-O2 Sensor Signal ... O2 Sensor/Heater or Circuit, ECU��

31 ....... Airflow Meter Signal ...... Airflow Meter or Circuit, ECU��

32 (1) ... Airflow Meter Signal ...... Airflow Meter or Circuit, ECU��

35 (3) ... HAC Sensor Signal ........... HAC Sensor or Circuit, ECU��

41 ........ TPS Signal ....................... TPS or Circuit, ECU��

42 .. Vehicle Speed Sensor Signal ...... Speed Sensor or Circuit,ECU��

43 ...... Starter Signal ............. Ignition Switch or Circuit, Starter Signal Circuit, ECU��

51 ....... Switch Signal ............. Accelerator Pedal or Cable, A/C Switch Circuit, A/C Amplifier, ECU, Neutral/Start Switch or Circuit, TPS Sensor or Circuit��

52 ..... Knock Sensor Signal .......... Knock Sensor or Circuit, ECU��

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

71 (4) .. EGR System Malfunction ..... EGR System, EGR Temp. Sensor, Sensor Circuit, EGR BVSV or VSV, BVSV or VSV Circuit, ECU

(1) - Only applicable to Pickup and 4Runner (3VZ-E).(2) - Only applicable to Pickup (Calif. 22R-E).(3) - Only applicable to Pickup (3VZ-E) cab and chassis models.(4) - Only applicable to California models.��

DIAGNOSTIC HINTS - EFI MODELS

TROUBLE CODE DIAGNOSTIC HINTS (FUEL INJECTED VEHICLES) TABLE��

Trouble Code Diagnostic Hints

11 ................... Momentary Interruption Of Power Supply To ECU Could Also Indicate Loss Of ECU E1 Ground Connection��

12 ................... No "Ne" (RPM) Ignition Signal To ECU Within 2 Seconds After Engine Is Cranked No "G" Ignition Signal To ECU 2 Times In A Row When Engine Speed Is Between 500-4000 RPM��

13 ....................... No "Ne" (RPM) Ignition Signal To ECU When Engine Speed Is Above 1500 RPM Signal Is Generated By Pick-Up Coils In Distributor��

14 ............................ No "IGF" Ignition Signal To ECU From

Ignitor Several Times In Succession��

21 ...................... (1) Detects Deterioration Of Oxygen Sensor Open Or Short In Oxygen Sensor Circuit��

22 ............. Open Or Short In Coolant Temp. Sensor/Switch Signal��

24 ......... Open Or Short Circuit In Intake Air Temp. Sensor Signal��

25 ................................ Open Circuit In O2 Sensor Signal Lean Signal Sent By O2 Sensor For Several Seconds During Air/Fuel Ratio Feedback Correction��

26 ............... Rich Signal Sent By O2 Sensor For Several Seconds During Air/Fuel Ratio Feedback Correction��

27 ........................... Open Or Short In Sub-O2 Sensor Signal��

31 & 32 ........... Short Circuit Between Terminals Of Airflow Meter��

34 ............................... Turbocharger Pressure Is Abnormal Code May Also Set If Airflow Meter Is Faulty��

35 ................ Open Circuit In High Altitude Compensator Signal��

41 ................ Open Or Short In Throttle Position Sensor Signal "IDL" & "PSW" Signals Are Output At Same Time For Several Seconds��

42 ....................... No "SPD" Signal From Vehicle Speed Sensor For 8 Seconds With Engine Speed Between 2300-5500 RPM & Coolant Temp. Is Below 176

�

F (80�

C) Except When Racing The Engine��

43 ..................... No "STA" Signal To ECU Until Engine Reaches 800 RPM With Vehicle Not Moving��

51 ...................... Problem In One Of 3 Switches ECU Monitors, Throttle Position Sensor ("IDL" Signal) Neutral Safety Switch ("NSW" Signal On A/T) A/C Signal To ECU Occurs When TPS Is At Idle & A/C Switch Is "ON" And Check Connector "E1" And "TE1" Is Jumpered��

52 .................... Open Or Short Circuit In Knock Sensor Signal��

53 .................................. Knock Control In ECU Is Faulty��

71 ...................... EGR Valve Normally Closed, Or Clogged Hose Open Circuit In EGR Temperature Sensor Signal EGR Gas Below Predetermined Level During EGR Control��

72 ........................ Open Circuit In Fuel-Cut Solenoid Signal

(1) - Also detects faults in O2 sensor heater, if equipped.��

DIAGNOSTIC CIRCUIT CHECK

Fig. 4: Diagnostic Circuit Check (3VZ-E)Courtesy of Toyota Motor Sales, U.S.A., Inc.

3VZ-E ECU TERMINAL IDENTIFICATION

Fig. 5: ECU Terminal ID (Pickup With M/T Except Cab & Chassis)Courtesy of Toyota Motor Sales, U.S.A., Inc.

Fig. 6: ECU Terminal ID (Pickup With A/T, Cab & Chassis With M/T)Courtesy of Toyota Motor Sales, U.S.A., Inc.

Fig. 7: ECU Terminal Identification (4Runner)Courtesy of Toyota Motor Sales, U.S.A., Inc.

TEST 1 OR CODE 11 - ECU (B+) CIRCUIT

Fig. 8: Test 1 or Code 11, BATT- E1 Diagram & Flow Chart (1 of 2)Courtesy of Toyota Motor Sales, U.S.A., Inc.

Fig. 9: Test 1 or Code 11, +B (+B1) - E Diagram & Flow Chart (2 of 2)Courtesy of Toyota Motor Sales, U.S.A., Inc.

TEST 2 OR CODE 12, 13, 14 - IGNITION & RPM SIGNAL

Fig. 10: Test 2 or Code 12, 13, 14 Diagram & Flow Chart (3VZ-E)Courtesy of Toyota Motor Sales, U.S.A., Inc.

NOTE: To check ignition system components, see IGNITION SYSTEMS under I - SYS/COMP TESTS article.

NOTE: Code 12 is caused by loss of "NE" or "G" signal to distributor or ECU during cranking. Code 13 is caused by loss of "NE" signal to distributor or ECU when engine RPM exceeds 1000 RPM

TEST 3 OR CODE 21 - OXYGEN SENSOR SIGNAL

Fig. 11: Test 3 or Code 21 Diagram & Flow Chart (3VZ-E)Courtesy of Toyota Motor Sales, U.S.A., Inc.

TEST 4 OR CODE 22 - COOLANT TEMPERATURE SENSOR SIGNAL


NOTE: Water temperature sensor is also referred to as coolant temperature sensor.

TEST 5 OR CODE 24, 31, 32 - AIR TEMP SENSOR/AIRFLOW METER

INTAKE AIR TEMPERATURE SENSOR & AIRFLOW METER SIGNAL

Fig. 13: Test 5 or Code 24, 31, 32, Vs-E2 Diagram & Flow Chart (1of 3)Courtesy of Toyota Motor Sales, U.S.A., Inc.

Fig. 14: Test 5 or Code 24, 31, 32, Vc - E2 Diagram & Flow Chart(2 of 3)Courtesy of Toyota Motor Sales, U.S.A., Inc.

Fig. 15: Test 5 or Code 24, 31, 32, THA - E2 Diagram & Flow Chart(3 of 3)Courtesy of Toyota Motor Sales, U.S.A., Inc.

CODE 25 - LEAN AIR/FUEL MIXTURE (3VZ-E)

Probable Causes

* Airflow Meter * Air Intake System * Coolant Temperature Sensor * ECU * Fuel Pressure * Ignition System * Injector Circuit or Injector * Oxygen Sensor or Sensor Circuit

NOTE: Diagnostic chart not available from manufacturer.

CODE 26 - RICH AIR/FUEL MIXTURE (3VZ-E)

Probable Causes

* Airflow Meter * Cold Start Injector * Coolant Temperature Sensor * ECU * Fuel Pressure * Injector Circuit or Injector * Oxygen Sensor or Sensor Circuit


CODE 35 - HAC SENSOR SIGNAL (3VZ-E)

NOTE: Pickup - cab and chassis only

Probable Causes

* ECU


TEST 6 OR CODE 41 - THROTTLE POSITION SENSOR SIGNAL

Fig. 16: Test 6 or Code 41, VTA - E2 Diagram & Flow Chart (1 of 3)Courtesy of Toyota Motor Sales, U.S.A., Inc.

Fig. 17: Test 6 or Code 41, IDL - E2 Diagram & Flow Chart (2 of 3)Courtesy of Toyota Motor Sales, U.S.A., Inc.

Fig. 18: Test 6 or Code 41, Vc - E2 Diagram & Flow Chart (3 of 3)Courtesy of Toyota Motor Sales, U.S.A., Inc.

CODE 42 - VEHICLE SPEED SENSOR SIGNAL (3VZ-E)

Probable Causes

* Vehicle Speed Sensor or Sensor Circuit * ECU


TEST 7 OR CODE 43 - STARTER SIGNAL


CODE 51 - SWITCH SIGNAL (3VZ-E)

Probable Causes

* A/C Switch or Switch Circuit * A/C Amplifier * Accelerator Pedal or Cable * ECU * Neutral/Start Switch or Switch Circuit * Throttle Position Sensor or Sensor Circuit


CODE 52 - KNOCK SENSOR SIGNAL (3VZ-E)

Probable Causes

* Knock Sensor or Sensor Circuit * ECU


CODE 53 - KNOCK SENSOR CONTROL (ECU) (3VZ-E)

Probable Causes

* ECU


TEST 8 OR CODE 71 - EGR SYSTEM MALFUNCTION


TEST 9 - INJECTOR CIRCUIT

Fig. 21: Test 9 Diagram & Flow Chart (3VZ-E)Courtesy of Toyota Motor Sales, U.S.A., Inc.

TEST 10 - COLD START INJECTOR CIRCUIT


TEST 11 - "CHECK ENGINE" LIGHT CIRCUIT


TEST 12 - STOPLIGHT SWITCH CIRCUIT

1989 toyota 4runner tests with codes v6

Documents