Air Conditioning System (Automatic) (Diagnostics - Introduction): Diagnosis Toyota 4Runner V

HOW TO PROCEED WITH TROUBLESHOOTING

HINT

1. Use these procedures to troubleshoot the air conditioning system.
2. *: Use the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP NEXT: Go to next step
2. CUSTOMER PROBLEM ANALYSIS AND SYMPTOM CHECK NEXT: Go to next step
3. INSPECT BATTERY VOLTAGE Measure the voltage of the battery. Standard voltage 11 to 14 V If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step. NEXT: Go to next step
4. CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM* Use the Techstream to check if the CAN communication system is functioning normally. RESULT Result Proceed to CAN DTC is not output A CAN DTC is output B B --> Go to CAN COMMUNICATION SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-422172-S35406285762011092600000) A: Go to next step
5. CHECK PANEL DIAGNOSIS Check panel diagnosis. Refer to «DIAGNOSIS SYSTEM»(ref-422144-S14758009192011092600000) . Indicator Check Sensor Check NEXT: Go to next step
6. CHECK FOR DTC* Check for DTCs and note any codes that are output. Refer to «DTC CHECK / CLEAR»(ref-422144-S22143148882011092600000) . Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-422144-S22143148882011092600000) . Based on the DTCs output above, try to force output of the air conditioning system DTC by simulating the conditions indicated by the DTC. Then recheck for DTCs. RESULT Result Proceed to DTC is not output A DTC is output B B --> Go to DIAGNOSTIC TROUBLE CODE CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-422144-S23081782792011092600000) A: Go to next step
7. PROBLEM SYMPTOMS TABLE Refer to Problem Symptoms Table. Refer to «PROBLEM SYMPTOMS TABLE»(ref-422144-S39567940892011092600000) . RESULT Result Proceed to Fault is not listed in problem symptoms table A Fault is listed in problem symptoms table B B --> Go to step 9 A: Go to next step
8. OVERALL ANALYSIS AND TROUBLESHOOTING* Terminals of ECU. Refer to «TERMINALS OF ECU»(ref-422144-S40775864582011092600000) Data List / Active Test. Refer to «DATA LIST / ACTIVE TEST»(ref-422144-S07427586662011092600000) On-vehicle Inspection Inspection NEXT: Go to next step
9. ADJUST, REPAIR OR REPLACE NEXT: Go to next step
10. CONFIRMATION TEST NEXT --> END

PROBLEM SYMPTOMS TABLE

HINT

1. Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
2. Inspect the fuses and relays related to this system before inspecting the suspected areas below.

AIR CONDITIONING SYSTEM

1. *: w/ PTC Heater

Scheme 164

Scheme 165

Scheme 166

Scheme 167

Scheme 168

1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY Disconnect the F42 amplifier connector. Measure the voltage and resistance according to the value(s) in the table below. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition F42-21 (B) - F42-14 (GND) V - W-B Battery power source Always 11 to 14 V F42-1 (IG+) - F42-14 (GND) L - W-B Ignition power supply Ignition switch ON 11 to 14 V Ignition switch off Below 1 V F42-14 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 ohms If the result is not as specified, there may be a malfunction on the wire harness side. Reconnect the F42 amplifier connector. Measure the voltage and resistance according to the value(s) in the table below. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition F42-3 (PTC1) - Body ground*1 V - Body ground PTC NO. 1 relay operation signal Engine running (1250 RPM or more) Temperature setting MAX HOT Outside temperature 10°C (50°F) or less Engine coolant temperature 79°C (174°F) or less Headlight dimmer switch off Blower switch on 11 to 14 V*2 F42-4 (PTC3) - Body ground*1 P - Body ground PTC NO. 3 relay operation signal Engine running (1250 RPM or more) Temperature setting MAX HOT Outside temperature 10°C (50°F) or less Engine coolant temperature 73°C (163°F) or less Headlight dimmer switch off Blower switch on 11 to 14 V*2 F42-5 (TAM) - F42-13 (SG-2) V - G Cooler thermistor (ambient temperature sensor) signal Ignition switch ON Ambient temperature 25°C (77°F) 1.35 to 1.75 V F42-5 (TAM) - F42-13 (SG-2) V - G Cooler thermistor (ambient temperature sensor) signal Ignition switch ON Ambient temperature 40°C (104°F) 0.9 to 1.2 V F42-8 (LOCK) - F42-13 (SG-2) R - G A/C compressor lock sensor signal Engine running Blower switch LO A/C switch on Pulse generation (Scheme 165) F42-9 (PRE) - Body Ground G - Body Ground No. 1 pressure switch signal Ignition switch ON Refrigerant pressure normal (below 3.14 MPa [32.0 kgf/cm 2, 455 psi] and higher than 0.196 MPa [2.0 kgf/cm 2, 28 psi]) Below 1 V F42-9 (PRE) - Body Ground G - Body Ground No. 1 pressure switch signal Ignition switch ON Refrigerant pressure abnormal (below 0.196 MPa [2.0 kgf/cm 2, 28 psi] or higher than 3.14 MPa [32.0 kgf/cm 2, 455 psi]) 4.69 V or higher F42-17 (AC1) - F42-14 (GND) LG - W-B Compressor operation signal Ignition switch ON A/C switch on Below 1 V F42-18 (MHTR) - F42-14 (GND) G - W-B MIR HTR relay signal Ignition switch ON Mirror heater switch on Below 1 V F42-20 (MGC) - F42-14 (GND) R - W-B Magnet clutch assembly operation signal Ignition switch ON Blower switch LO A/C switch on Below 1 V F42-22 (PTC2) - Body ground*1 LG - Body ground PTC NO. 2 relay operation signal Engine running (1250 RPM or more) Temperature setting MAX HOT Outside temperature 10°C (50°F) or less Engine coolant temperature 76°C (169°F) or less Headlight dimmer switch off Blower switch on 11 to 14 V*2 F42-23 (BLW) - F42-14 (GND) LG - W-B Blower with fan motor sub-assembly control signal Ignition switch ON Blower switch LO Pulse generation (Scheme 166) F42-25 (ALT) - F42-14 (GND)*1 L - W-B Generator signal (PTC heater control) Engine started Pulse generation F42-27 (ACT) - F42-14 (GND) SB - W-B Compressor operation signal Ignition switch ON A/C switch on 4.75 to 5.25 V F42-29 (TR) - F42-34 (SG-1) GR - SB Cooler thermistor (room temperature sensor) signal Ignition switch ON Cabin temperature at 25°C (77°F) 1.8 to 2.2 V Ignition switch ON Cabin temperature at 40°C (104°F) 1.2 to 1.6 V F42-32 (TSP) - F42-14 (GND) B - W-B Automatic light control sensor (solar sensor) power signal (for front passenger side) Ignition switch ON Solar sensor subjected to electric light Vehicle indoors 0.8 to 4.3 V Ignition switch ON Automatic light control sensor (solar sensor) covered with cloth Vehicle indoors Below 0.8 V F42-33 (TSD) - F42-14 (GND) GR - W-B Automatic light control sensor (solar sensor) power signal (for driver side) Ignition switch ON Solar sensor subjected to electric light Vehicle indoors 0.8 to 4.3 V Ignition switch ON Automatic light control sensor (solar sensor) covered with cloth Vehicle indoors Below 0.8 V z14-2 (BUS G) - Body ground - Ground for BUS IC Always Below 1 V z14-3 (BUS) - z14-2 (BUS G) - BUS IC control signal Ignition switch ON Pulse generation z14-4 (B BUS) - z14-2 (BUS G) - Power supply for BUS IC Always 11 to 14 V z14-6 (TE) - z14-5 (SG) - No. 1 cooler thermistor signal Ignition switch ON Evaporator temperature 0°C (32°F) 1.7 to 2.1 V Ignition switch ON Evaporator temperature 15°C (59°F) 0.9 to 1.3 V *1: w/ PTC Heater HINT: *2: After the measurement conditions are met, wait 30 seconds before performing measurements. If the result is not as specified, the air conditioning amplifier assembly may have a malfunction. Using an oscilloscope, check waveform 1. A/C COMPRESSOR LOCK SENSOR SIGNAL Item Content Terminal No. (Symbol) F42-8 (LOCK) - F42-13 (SG-2) Tool Setting 200 mV/DIV., 10 ms./DIV. Condition Engine running A/C switch on Blower switch LO Using an oscilloscope, check waveform 2. BLOWER MOTOR CONTROL SIGNAL Item Content Terminal No. (Symbol) F42-23 (BLW) - F42-14 (GND) Tool Setting 1 V/DIV., 500 μs/DIV. Condition Ignition switch ON Blower switch LO HINT: When the blower level is increased, the duty ratio changes accordingly.
2. CHECK HEATER CONTROL ASSEMBLY Disconnect the F29 control connector. Measure the resistance and voltage according to the value(s) in the table below. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition F29-4 (IG+) - F29-11 (GND) L - W-B IG power supply Ignition switch ON 11 to 14 V F29-11 (GND) - Body ground W-B - Body ground Ground Always Below 1 ohms If the result is not as specified, there may be a malfunction on the wire harness side.
3. CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Remove the main body ECU. Refer to «REMOVAL»(ref-422214-S08215784352011092600000). Measure the voltage and resistance according to the value(s) in the table below. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition A-11 (GND1) - Body ground - Ground Always Below 1 ohms A-29 (ACC) - Body ground - ACC power supply Ignition switch ACC 11 to 14 V A-31 (ALTB) - Body ground - Battery power supply Always 11 to 14 V A-32 (IG) - Body ground - Ignition switch power supply Ignition switch ON 11 to 14 V If the result is not as specified, there may be a malfunction in the wire harness. Install the main body ECU. Refer to «INSTALLATION»(ref-422214-S32344201202011092600000). Measure the voltage according to the value(s) in the table below. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition F9-20 (CLTB) - Body ground P - Body ground Automatic light control sensor power supply output Ignition switch off Below 1 V Ignition switch ON 11 to 14 V F9-22 (CLTE) - Body ground L - Body ground Automatic light control sensor ground Always Below 1 ohms If the result is not as specified, the main body ECU or driver side junction block assembly may have a malfunction.

Scheme 169

Scheme 170

Scheme 171

Scheme 172

1. DESCRIPTION Air conditioning system data and Diagnostic Trouble Codes (DTCs) can be read through the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform troubleshooting.
2. CHECK DLC3 Check the DLC3. Refer to «DTC CHECK / CLEAR»(ref-422144-S22143148882011092600000) .
3. LIST OF OPERATION METHODS By operating each of the air conditioning control switches as shown in the diagram below, it is possible to enter the diagnostic check mode.
4. INDICATOR CHECK Turn the ignition switch off. Turn the ignition switch to ACC and wait at least 5 seconds. Press and hold the air conditioning control "AUTO" switch and "recirculation/fresh" switch simultaneously, and turn the ignition switch to ON. Continue holding the 2 switches until panel diagnosis mode begins. Check that all indicators turn on and off 4 times in succession at 1 second intervals. HINT: After the indicator check is completed, the system enters DTC check mode automatically. Press the "OFF" switch to cancel the check mode.
5. DTC CHECK (SENSOR CHECK) Start the engine and warm it up. Perform the indicator check. HINT: After the indicator check is completed, the system enters DTC check mode automatically. Read the code displayed on the panel. NOTE: In sensor check mode, which is automatically entered after indicator check mode, troubleshooting may be only partially completed. HINT: Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-422144-S23081782792011092600000) . When there are no problems, DTC 00 is output. As an example, the illustration shows that DTC 22 is output. If the codes are difficult to read because they change automatically, operate the driver temperature up switch to display the codes one at a time so that they can be read easily. The items are displayed one by one each time the driver temperature up switch is operated. HINT: Push the "OFF" switch to finish panel diagnosis.

DTC CHECK / CLEAR

1. CHECK FOR DTC Connect the Techstream to the DLC3. Turn the ignition switch to ON. Turn the Techstream on. Enter the following menus: Body Electrical / Air Conditioner / Trouble Codes. Check for DTCs.
2. CLEAR DTC Connect the Techstream to the DLC3. Turn the ignition switch to ON. Turn the Techstream on. Enter the following menus: Body Electrical / Air Conditioner / Trouble Codes. Clear the DTCs.

DATA LIST / ACTIVE TEST

1. DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time. NOTE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. Connect the Techstream to the DLC3. Turn the ignition switch to ON. Turn the Techstream on. Enter the following menus: Body Electrical / Air Conditioner / Data List. Powertrain / Engine and ECT / Data List. According to the display on the Techstream, read the Data List. AIR CONDITIONER Tester Display Measurement Item/Range Normal Condition Diagnostic Note Room Temperature Sensor Cooler thermistor (room temperature sensor) / Min.: -6.5°C (20.3°F) Max.: 57.25°C (135.05°F) Actual room temperature for front seat displayed Open in the circuit: -6.5°C (20.3°F). Short in the circuit: 57.25°C (135.05°F). Ambient Temp Sensor Cooler thermistor (ambient temperature sensor) / Min.: -23.3°C (-9.94°F) Max.: 65.95°C (150.71°F) Actual ambient temperature displayed Open in the circuit: -23.3°C (-9.94°F). Short in the circuit: 65.95°C (150.71°F). Adjusted Ambient Temp Adjusted ambient temperature / Min.: -30.8°C (-23.44°F) Max.: 50.8°C (123.44°F) Adjusted ambient temperature displayed - Evaporator Fin Thermistor No. 1 cooler thermistor / Min.: -29.7°C (-21.46°F) Max.: 59.55°C (139.19°F) Actual evaporator temperature displayed Open in the circuit: -29.7°C (-21.46°F). Short in the circuit: 59.55°C (139.19°F). Evaporator Target Temp Target evaporator temperature / Min.: -327.68°C (-557.82°F) Max.: 327.67°C (621.81°F) Target evaporator temperature displayed - Solar Sensor (D Side) Automatic light control sensor (solar sensor) / Min.: 0, Max.: 255 Driver side solar sensor voltage increases as brightness increases Open in the circuit: 0. Short in the circuit: 255. Solar Sensor (P Side) Automatic light control sensor (solar sensor) / Min.: 0, Max.: 255 Passenger side solar sensor voltage increases as brightness increases Open in the circuit: 0. Short in the circuit: 255. Engine Coolant Temp Engine coolant temperature / Min.: 1.3°C (34.34°F) Max.: 90.55°C (194.99°F) Actual engine coolant temperature displayed - Set Temperature (D Side) Driver side set temperature / MAX COLD: 17.5°C (63.5°F) MAX HOT: 32.5°C (90.5°F) Driver side set temperature displayed - Set Temperature (P Side) Passenger side set temperature / MAX COLD: 17.5°C (63.5°F) MAX HOT: 32.5°C (90.5°F) Passenger side set temperature displayed - Blower Motor Speed Level Blower with fan motor sub-assembly speed level / Min.: 0, Max.: 31 Increases in range from 0 to 31 as blower with fan motor sub-assembly speed increases - Air Mix Servo Targ Pulse (D) Damper servo sub-assembly (driver side air mix damper servo) target pulse / Min.: 0, Max.: 255 107 (pulse): MAX COOL 26 (pulse): MAX HOT - Air Mix Servo Actual Pulse (D) Damper servo sub-assembly (driver side air mix damper servo) actual pulse / Min.: 0, Max.: 255 107 (pulse): MAX COOL 26 (pulse): MAX HOT - Air Mix Servo Targ Pulse (P) Damper servo sub-assembly (front passenger side air mix damper servo) target pulse / Min.: 0, Max.: 255 112 or 127 (pulse): MAX COOL 21 or 31 (pulse): MAX HOT - Air Mix Servo Actual Pulse (P) Damper servo sub-assembly (front passenger side air mix damper servo) actual pulse / Min.: 0, Max.: 255 112 or 127 (pulse): MAX COOL 21 or 31 (pulse): MAX HOT - Air Outlet Servo Pulse (D) Damper servo sub-assembly (mode damper servo) target pulse / Min.: 0, Max.: 255 15 (pulse): FACE 1 23 (pulse): FACE 2 41 (pulse): B/L 65 or 73 (pulse): FOOT 83 or 95 (pulse): F/D 113 (pulse): DEF - Air Outlet Servo Actu Pulse (D) Damper servo sub-assembly (mode damper servo) actual pulse / Min.: 0, Max.: 255 15 (pulse): FACE 1 23 (pulse): FACE 2 41 (pulse): B/L 65 or 73 (pulse): FOOT 83 or 95 (pulse): F/D 113 (pulse): DEF - Air Inlet Damper Targ Pulse Recirculation damper servo sub-assembly target pulse / Min.: 0, Max.: 255 7 (pulse): Recirculation 28 (pulse): Fresh - Air Inlet Damper Actual Pulse Recirculation damper servo sub-assembly actual pulse / Min.: 0, Max.: 255 7 (pulse): Recirculation 28 (pulse): Fresh - Electric Heater Active Level* Number of electric heaters operating / Min.: 0, Max.: 3 - - Shift Set Temperature Set temperature shift / 2C incr, 1C incr, Normal, 1C decr or 2C decr Customized value displayed - Air Inlet Mode Air inlet mode / Auto or Manual Customized setting displayed - Compressor Mode Compressor mode / Auto or Manual Customized setting displayed - Add Foot Air in FACE Mode Add foot air in face mode / ON or OFF Customized setting displayed - Button Press Buzzer Button press buzzer / ON or OFF Customized setting displayed - Foot/DEF Auto Mode Foot/Def auto mode / ON or OFF Customized setting displayed - Foot/DEF Auto Blow Up Foot/Def auto blower level function / ON or OFF Customized setting displayed - Pls Servo Test Sts Pulse servo motor test status / 00, 01, 02, 03, 04 00: Wait 01: Move 02: Comp 03: Error 04: Stop - Number of Trouble Codes Number of trouble codes / Min.: 0, Max.: 255 Number of DTCs stored - *: w/ PTC Heater ENGINE AND ECT Tester Display Measurement Item/Range Normal Condition Diagnostic Note A/C Signal A/C signal / ON or OFF ON: A/C switch on OFF: A/C switch off
2. ACTIVE TEST HINT: Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests. Connect the Techstream to the DLC3. Turn the ignition switch to ON. Turn the Techstream on. Enter the following menus: Body Electrical / Air Conditioner / Active Test. According to the display on the Techstream, perform the Active Test. AIR CONDITIONER Tester Display Test Part Control Range Diagnostic Note Blower Motor Blower with fan motor sub-assembly Min.: 0, Max.: 31 - Magnetic Clutch Relay Magnet clutch relay operation ON or OFF - Defogger Relay (Rear) Rear window defogger relay operation ON or OFF - Heater Active Level* Heater level Min.: 0, Max.: 3 - Air Mix Servo Targ Pulse (D) Damper servo sub-assembly (driver side air mix damper servo) target pulse Min.: 0, Max.: 255 - Air Mix Servo Targ Pulse (P) Damper servo sub-assembly (front passenger side air mix damper servo) target pulse Min.: 0, Max.: 255 - Air Outlet Servo Pulse (D) Damper servo sub-assembly (mode damper servo) pulse Min.: 0, Max.: 255 - Air Inlet Damper Targ Pulse Recirculation damper servo sub-assembly target pulse Min.: 0, Max.: 255 - *: w/ PTC Heater

DIAGNOSTIC TROUBLE CODE CHART

HINT

1. If a trouble code is output during the DTC check, inspect the trouble areas listed for that code. For details of the code, refer to the "See" below.
2. *: The air conditioning amplifier stores the DTC of the respective malfunction that has been detected for the period of time indicated in parentheses.