Air Conditioning System - Diagnostics: Other Toyota 4Runner IV

TERMINALS OF ECU

Air Conditioning Amplifier

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Air Conditioning Control Assy

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ECM

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(*3): Oscilloscope waveform: Terminal to be measured: BLC of A/C amplifier Setting for measurement: 2 V DIV 500 m sec./DIV Condition: Ignition switch ON

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(*4): Oscilloscope waveform: Terminal to be measured

TW2 of A/C amplifier and TWHO of ECM Setting for measurement: 5 V DIV 0.1 sec./DIV Condition: Ignition switch ON

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(*5): Oscilloscope waveform

Terminal to be measured: LCKI of A/C amplifier and ECM Setting for measurement: 200 mV DIV 10 m sec./DIV Condition: Ignition switch ON

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Circuit Diagram

Note. For complete System Wiring Diagrams, see SYSTEM WIRING DIAGRAMS .

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1. INSPECT AIR CONDITIONING AMPLIFIER (TR, SG) Remove the A/C amplifier with the connectors being connected. Turn ignition switch to ON. Measure voltage between terminal TR and SG of the A/C amplifier connector at each temperature. Voltage: at 25 °C (77 °F) : 1.8 - 2.2 V at 40 °C (104 °F) : 1.2 - 1.6 V NOTE: As the temperature increases, the voltage decreases. OK : Proceed To Next Circuit Inspection Shown On Problem Symptoms Table NG : Go to Next Step
2. Inspect Cooler Thermistor Remove the cooler thermistor (room temp. sensor). Measure resistance between terminals of the cooler thermistor (Room temp. sensor) connector at each temperature. Resistance: at 25 °C (77 °F): 1.65 - 1.75 kohm at 40 °C (104 °F): 0.55 - 0.65 kohm NOTE: As the temperature increases, the resistance decreases, as shown in the illustration. NG : Replace Cooler Thermistor OK : Go To Next Step
3. Check Harness And Connector (Between Cooler Thermistor (Room Temp. Sensor) And Air Conditioning Amplifier) Check for open and short circuit in the harness and the connector between the cooler thermistor (room temp. sensor) and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-190050-S42441265552005091300000) ). NG : Repair Or Replace Harness Or Connector OK : Go To Next Step
4. Check Diagnostic Trouble Code Start up the DTC check mode. Check that DTC 11 is not output again. Standard: DTC 11 is not output. OK : System OK NG : Go to Next Step

Note. For complete System Wiring Diagrams, see SYSTEM WIRING DIAGRAMS .

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1. Inspect Air Conditioning Amplifier (TAM, SG) Remove the A/C amplifier with the connectors being connected. Turn the ignition switch to ON. Measure voltage between terminal TAM and SG of the A/C amplifier connector at each temperature. Voltage: at 25 °C (77 °F) : 1.4 - 1.8 V at 40 °C (104 °F) : 0.9 - 1.3 V NOTE: As the temperature increases, the voltage decreases. NG : Proceed To Next Circuit Inspection Shown On Problem Symptoms Table OK : Go To Next Step
2. Inspect Thermistor Assy Remove the thermistor assy (ambient temp. sensor). Measure resistance between terminal of the thermistor assy (ambient temp. sensor) connector at each temperature. Resistance: at 25 °C (77 °F) : 1.65 - 1.75 kohm at 40 °C (104 °F) : 0.85 - 0.95 kohm NOTE: As the temperature increases, the resistance decreases as shown in the illustration. NG : Replace Thermistor Assy OK : Go To Next Step
3. Check Harness And Connector (Between Thermistor Assy (Ambient Temp. Sensor) And Air Conditioning Amplifier) Check for open and short circuit in the harness and the connector between the thermistor assy (ambient temp. sensor) and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-190050-S42441265552005091300000) ). NG : Repair Or Replace Harness Or Connector OK : Go To Next Step
4. Check Diagnostic Trouble Code Start up the DTC check mode. Check that the DTC 12 is not output again. Standard: DTC 12 is not output. NG : System OK OK : Check And Replace Air Conditioning Amplifier

Note. For complete System Wiring Diagrams, see SYSTEM WIRING DIAGRAMS .

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1. Inspect Air Conditioning Amplifier (TE, SG) Remove the A/C amplifier with the connectors still connected. Turn ignition switch to ON. Measure voltage between terminal TE and SG of the A/C amplifier connector at each temperature. Voltage at 0 °C (32 °F) : 2.0 - 2.4 V at 15 °C (59 °F) : 1.4 - 1.8 V NG : Proceed To Next Circuit Inspection Shown On Problem Symptoms Table OK : Go To Next Step
2. Inspect Cooler Thermistor No. 1 Remove the cooler thermistor No. 1 (evaporator temp. sensor). Measure resistance between terminal of the cooler thermistor No. 1 (evaporator temp. sensor) at each temperature, as shown in the chart. NOTE: As the temperature increases, the resistance decreases as shown in the illustration. Resistance: NG : Replace Cooler Thermistor No. 1 OK : Go To Next Step
3. Check Harness And Connector (Between Cooler Thermistor No. 1 (Evaporator Temp. Sensor) And Air Conditioning Amplifier) Check for open and short in the harness and the connector between the cooler thermistor No. 1 (evaporator temp. sensor) and the A/C amplifier (See page «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-190050-S42441265552005091300000) ). NG : Repair Or Replace Harness Or Connector OK : Go To Next Step
4. Check Diagnostic Trouble Code Start up the DTC check mode. Check that DTC 11 is not output again. Standard: DTC 11 is not output. NG : System OK OK : Check And Replace Air Conditioning Amplifier

Note. For complete System Wiring Diagrams, see SYSTEM WIRING DIAGRAMS .

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1. Diagnostic Trouble Code Check Check that the DTC P0115 is not output. Standard: DTC P0115 is not output. NG : Go To Engine Control System (See ENGINE CONTROL SYSTEM ) OK : Go To Next Step
2. Inspect ECM (THWO) Remove ECM with the connectors being connected. Turn the ignition switch to ON. Check the signal waveform between terminal THWO of the ECM connector and body ground. Standard: The correct signal waveform appears, as shown in the illustration. NOTE: The waveform "A" becomes longer as the engine coolant temperature becomes higher. ECM WAVEFORM Engine Coolant temp. Below 30 °C (86 °F) Approx. 75 °C (167 °F) 90 °C - 100 °C (194 - 212 °F) A 16 ms 102 ms 262 ms NG : Check And Replace ECM OK : Go To Next Step
3. Check Harness And Connector (Between ECM And Air Conditioning Amplifier) Check for open and short circuit in the harness and the connector between ECM and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-190050-S42441265552005091300000) ). Result: ECM RESULT A OK (when checking using DTC) B OK (when checking using PROBLEM SYMPTOMS TABLE) C NG B : Proceed To Next Circuit Inspection Shown On Problem Symptoms Table C : Repair Or Replace Harness Or Connector A : Check And Replace Air Conditioning Amplifier

Note. For complete System Wiring Diagrams, see SYSTEM WIRING DIAGRAMS .

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1. Inspect Air Conditioning Amplifier (TS, TSP, S5) Remove the A/C amplifier assy with the connectors being connected. Turn the ignition switch to ON Check voltage. SR-5 grade: Measure voltage between terminal TS and S5 of the A/C amplifier connector when the cooler (solar sensor) thermistor is subjected to an electric light and when the cooler (solar sensor) thermistor is covered by a cloth. Voltage: Sensor is subjected to electrical light: 0.8 - 3.3 V Sensor is covered by a cloth: Below 0.8 V Limited grade: Measure voltage between terminal TSPA and S5 of the A/C amplifier connector when the cooler (solar sensor) thermistor is subjected to an electric light and when the cooler (solar sensor) thermistor is covered by a cloth. Voltage: Sensor is subjected to electrical light: 0.8 - 3.3 V Sensor is covered by a cloth: Below 0.8 V NG : Proceed To Next Circuit Inspection Shown On Problem Symptoms Table OK : Go To Next Step
2. Inspect Cooler (Solar Sensor) Thermistor Remove the cooler (solar sensor) thermistor. Cover sensor with a cloth, and check and measure resistance between terminal 1 and 2 of the cooler (solar sensor) thermistor. Resistance: infinite ohm (No continuity) NOTE: Connect the ohmmeter positive (+) lead to terminal 2 and the ohmmeter negative (-) lead to terminal 1 of the cooler (solar sensor) thermistor. Remove the cloth from the cooler (solar sensor) thermistor and subject the sensor to the electric light and measure resistance between terminal 1 and 2 of the cooler (solar sensor) thermistor. Resistance: Approx. 10 kohm (Continuity) NOTE: Connect the ohmmeter positive (+) lead to terminal 2 and the ohmmeter negative (-) lead to terminal 1 of the cooler (solar sensor) thermistor. NG : Replace Cooler (Solar Sensor) Thermistor OK : Go To Next Step
3. Check Harness And Connector (Between Cooler (Solar Sensor) Thermistor And Air Conditioning Amplifier) Check for open and short circuit in the harness and the connector between the cooler (solar sensor) thermistor and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-190050-S42441265552005091300000) ). NG : Repair Or Replace Harness Or Connector OK : Go To Next Step
4. Check Diagnostic Trouble Code Start up the DTC check mode. Check that DTC 21 is not output again. Standard: DTC 21 is not output. NG : System OK OK : Check And Replace Air Conditioning Amplifier

Note. For complete System Wiring Diagrams, see SYSTEM WIRING DIAGRAMS .

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1. Inspect ECM (LCKI) Remove ECM with the connectors being connected. Start the engine. Operate the A/C system. Check the signal waveform between terminal LCKI of ECM and body ground. Standard: The correct waveform appears as shown in the illustration. OK : Go to step 6 NG : Go To Next Step
2. Check Cooler Compressor Assy Check and adjust the compressor drive belt tension (See «COOLER COMPRESSOR ASSY»(ref-190124-S18696947742005091500000) ). Check if the cooler compressor assy does not lock while running the engine and operating the A/C system. Standard: Cooler compressor assy does not lock during the operation. NG : Replace Cooler Compressor Assy OK : Go To Next Step
3. Inspect Cooler Compressor Assy (Compressor Lock Sensor) Disconnect the cooler compressor assy connector. Measure resistance between terminal 1 and 2 of the cooler compressor assy connector. Resistance: at 20 °C (68 °F): 165 - 205 ohm NG : Replace Cooler Compressor Assy OK : Go To Next Step
4. Check Harness And Connector (Between ECM And Air Conditioning Amplifier) Check for open and short circuit in the harness and the connector between the cooler compressor assy and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-190050-S42441265552005091300000) ). NG : Repair Or Replace Harness Or Connector OK : Go To Next Step
5. Check Harness And Connector (Between Cooler Compressor Assy And Body Ground) Check for open and short circuit in the harness and the connector between the cooler compressor assy and body ground (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-190050-S42441265552005091300000) ). NG : Repair Or Replace Harness Or Connector OK : Check And Replace ECM
6. Inspect ECM (ACLD) Remove ECM with the connectors being connected. Operate A/C system. Measure voltage between terminal ACLD of ECM and body ground under each condition. Voltage: Magnetic clutch is engaged: Below 1.0 V Magnetic clutch is not engaged: 10 - 14 V NG : Check And Replace ECM OK : Go To Next Step
7. Inspect Air Conditioning Amplifier (ACLD) Remove the A/C amplifier assy with the connectors being connected. Operate the A/C system. Measure voltage between terminal ACLD of the A/C amplifier assy and body ground under each condition. Voltage: Magnetic clutch is engaged: Below 1.0 V Magnetic clutch is not engaged: 10 - 14 V Result: ACLD RESULT A NG B OK (when checking using PROBLEM SYMPTOM TABLE) C OK (when checking using DTC) B : Proceed To Next Circuit Inspection Shown On Problem Symptoms Table C : Check And Replace Air Conditioning Amplifier A : Repair Or Replace Harness Or Connector

Note. For complete System Wiring Diagrams, see SYSTEM WIRING DIAGRAMS .

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1. Inspect Air Conditioning Amplifier (PSW) Install the manifold gauge set. Remove the A/C amplifier with the connectors being connected. Turn the ignition switch to ON. Check voltage between terminal PSW of the A/C amplifier assy connector and body ground when refrigerant pressure is changed. The voltage changes with refrigerant pressure as shown in the diagram below. Voltage: OK : Proceed To Next Circuit Inspection Shown On Problem Symptoms Table NG : Go To Next Step
2. Inspect Condenser Assy (Pressure SW) Turn the ignition switch to ON. Check continuity between terminal 1 and 4 of the pressure switch when refrigerant pressure is changed. The continuity changes with refrigerant pressure as shown in the diagram below. Continuity: NG : Replace Condenser Assy OK : Go To Next Step
3. Check Harness And Connector (Between Pressure Switch And Air Conditioning Amplifier) Check for open and short circuit in the harness and the connector between the pressure switch and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-190050-S42441265552005091300000) ). NG : Repair Or Replace Harness Or Connector OK : Go To Next Step
4. Check Diagnostic Trouble Code Start up the DTC check mode. Check that DTC 23 is not output again. Standard: DTC 23 is not output. OK : System OK NG : Check And Replace Air Conditioning Amplifier

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A photo diode in the solar sensor detects solar radiation and sends signals to the A/C amplifier.

Note. This DTC is indicated only for limited grade (right/left independent temperature control system).

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Note. For complete System Wiring Diagrams, see SYSTEM WIRING DIAGRAMS .

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1. Inspect Air Conditioning Amplifier (TS, S5) Remove the A/C amplifier with the connectors still connected. Turn the ignition switch to ON. Measure voltage between terminal TSDR and S5 of the A/C amplifier connector when the cooler (solar sensor) thermistor is subjected to an electric light and when the cooler (solar sensor) thermistor is covered by a cloth. Voltage: Sensor is subjected to electrical light: 0.8 - 3.3 V Sensor is covered by a cloth: Below 0.8 V OK : Proceed To Next Circuit Inspection Shown On Problem Symptoms Table NG : Go To Next Step
2. Inspect Cooler (Solar Sensor) Thermistor Remove cooler (solar sensor) thermistor. Cover the sensor with a cloth, and check the cooler (solar sensor) thermistor resistance. Measure resistance between terminals 1 and 3 of the cooler (solar sensor) thermistor. Resistance: infinite ohm (No continuity) NOTE: Connect the ohmmeter positive (+) lead to terminal 3 and the ohmmeter negative (-) lead to terminal 1 of the cooler (solar sensor) thermistor. Remove the cloth from the cooler (solar sensor) thermistor, and subject the sensor to the electric light and check the cooler (solar sensor) thermistor resistance. Measure resistance between terminal 1 and 3 of the cooler (solar sensor) thermistor. Resistance: Approx. 10 kohm (Continuity) NOTE: Connect the positive (+) lead to ohmmeter to terminal 3 and negative (-) lead to terminal 1 of the cooler (solar sensor) thermistor. NG : Replace Cooler (Solar Sensor) Thermistor OK : Go To Next Step
3. Check Harness And Connector (Between Cooler (Solar Sensor) Thermistor And Air Conditioning Amplifier) Check for open and short circuit in the harness and the connector between the cooler (solar sensor) thermistor and the air conditioning amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-190050-S42441265552005091300000) ). NG : Repair Or Replace Harness Or Connector OK : Go To Next Step
4. Check Diagnostic Trouble Code Start up the DTC check mode. Check that DTC 24 is not output again. Standard: DTC 24 is not output OK : System OK NG : Check And Replace Air Conditioning Amplifier

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This sensor detects the position of the air mix damper and sends the appropriate signals to the A/C amplifier. The position sensor is built into the damper servo sub-assy (air mix control servomotor.

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Note. For complete System Wiring Diagrams, see SYSTEM WIRING DIAGRAMS .

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1. Inspect Air Conditioning Amplifier (TP, TPPA, SG) Remove the A/C amplifier with the connectors being connected. Turn ignition switch to ON. Check voltage. SR-5 grade: Change the set temperature to activate the air mix damper, and measure the voltage between terminal TP and SG of the A/C amplifier. Voltage: Max. Cold: 3.5 - 4.5 V Max. Hot: 0.5 - 1.8 V Limited grade: Change the set temperature to activate the air mix damper, and measure the voltage between terminal TPPA and SG of the A/C amplifier. Voltage: Max. Cold: 3.5 - 4.5 V Max. Hot: 0.5 - 1.8 V NOTE: As the set temperature increases, the voltage decreases gradually without interruption. OK : Proceed To Next Circuit Inspection Shown On Problem Symptoms Table NG : Go To Next Step
2. Inspect Damper Servo Sub-Assy Remove the damper servo sub-assy. Measure resistance between terminal 1 and 2 of damper servo sub-assy connector. Resistance: 4.2 - 7.8 k ohm While operating the damper servo sub-assy as shown in the procedure on «DTC 41 AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT (PASSENGER SIDE)»(ref-190085-S30845654152005091300000) , measure resistance between terminal 1 and 3 of the damper servo sub-assy. Resistance: Max. Cold: 3.4 - 6.2 Kohm Max. Hot: 0.8 - 1.6 Kohm NOTE: As the damper servo sub-assy moves from COLD side to HOT side, the resistance decreases gradually without interruption. NG : Replace Damper Servo Sub-Assy OK : Go To Next Step
3. Check Harness And Connector (Between Air Mix Damper Position Sensor And Air Conditioning Amplifier) Check for open and short in the harness and the connector between the damper servo sub-assy (air mix damper position sensor) and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-190050-S42441265552005091300000) ). NG : Repair Or Replace Harness Or Connector OK : Go To Next Step
4. Check Diagnostic Trouble Code Start up the DTC check mode. Check that DTC 11 is not output again. Standard: DTC 11 is not output. OK : System OK NG : Check And Replace Air Conditioning Amplifier

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This sensor detects the position of the air inlet damper and sends appropriate signals to the A/C amplifier. The position sensor is built into the blower damper servo sub-assy (air inlet damper control servomotor).

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Note. For complete System Wiring Diagrams, see SYSTEM WIRING DIAGRAMS .

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1. Inspect Air Conditioning Amplifier (TPI, SG) Remove the A/C amplifier with the connectors being connected. Turn ignition switch to ON. Change the set RECIRCULATION/FRESH to activate the blower damper servo sub-assy, and measure the voltage between terminal TPI and SG of the A/C amplifier. Voltage: Recirculation: 3.5 - 4.5 V Fresh: 0.5 - 1.8 V NOTE: As the recirculation damper servo sub-assy is moved from recirculation side to fresh side, the voltage decreases gradually without interruption. OK : Proceed To Next Circuit Inspection Shown On Problem Symptoms Table NG : Go To Next Step
2. Inspect Blower Damper Servo Sub-Assy Remove the blower damper servo sub-assy. Measure resistance between terminal 1 and 2 of the blower damper servomotor connector. Resistance: 4.2 - 7.8 Kohm While operating blower damper servo sub-assy as shown in the procedure on «DTC 42 Air Inlet Damper Control Servomotor Circuit»(ref-190085-S20023389762005091300000) , Measure resistance between terminal 1 and 3 of the blower damper servo sub-assy. Resistance: Fresh: 3.4 - 6.2 Kohm Recirculation: 0.8 - 1.6 Kohm NOTE: As the blower damper servo sub-assy moves from FRESH side to RECIRCULATION side, the resistance decreases gradually without interruption. NG : Replace Blower Damper Servo Sub-Assy OK : Go To Next Step
3. Check Harness And Connector (Between Air Inlet Damper Position Sensor And Air Conditioning Amplifier) Check for open and short circuit in the harness and the connector between the blower damper servo sub-assy (air inlet damper position sensor) and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-190050-S42441265552005091300000) ). NG : Repair Or Replace Harness Or Connector OK : Go To Next Step
4. Check Diagnostic Trouble Code Start up the DTC check mode. Check that DTC 32 is not output again. Standard: DTC 32 is not output. OK : System OK NG : Check And Replace Air Conditioning Amplifier

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This sensor detects the position of the air outlet damper and sends appropriate signals to the A/C amplifier. The position sensor is built into the mode damper servo sub-assy (air outlet servomotor).

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Note. For complete System Wiring Diagrams, see SYSTEM WIRING DIAGRAMS .

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1. Inspect Air Conditioning Amplifier (TPO, SG) Remove the A/C amplifier with the connectors being connected. Turn the ignition switch to ON. Change the set air flow mode to activate the mode damper servo sub-assy, and measure voltage between terminal TPO and SG of the A/C amplifier. Voltage: FACE: 3.5 - 4.5 V DEF: 0.5 - 1.5 V NOTE: As the mode damper is moved from FACE side to DEF side, the voltage decreases gradually without interruption. OK : Proceed To Next Circuit Inspection Shown On Problem Symptoms Table NG : Go To Next Step
2. Inspect Mode Damper Servo Sub-Assy Remove the mode damper servo sub-assy. Measure resistance between terminal 1 and 2 of the mode damper servo sub-assy connector. Resistance: 4.2 - 7.8 kohm While operating the mode damper servo sub-assy as in the procedure on «DTC 43 AIR OUTLET DAMPER CONTROL SERVOMOTOR CIRCUIT»(ref-190085-S13795635732005091300000) , measure resistance between terminal 1 and 3 of mode damper servo sub-assy. Resistance: DEF: 3.4 - 6.2 kohm FACE: 0.8 - 1.6 kohm NOTE: As the mode damper servo sub-assy moved from DEF side to FACE side, the resistance decreases gradually without interruption. NG : Replace Mode Damper Servo Sub-Assy OK : Go To Next Step
3. Check Harness And Connector (Between Air Outlet Damper Position Sensor And Air Conditioning Amplifier) Check for open and short circuit in the harness and the connector between the mode damper servo sub-assy (air outlet damper position sensor) and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-190050-S42441265552005091300000) ). NG : Repair Or Replace Harness Or Connector OK : Go To Next Step
4. Check Diagnostic Trouble Code Start up the DTC check mode. Check that DTC 33 is not output again. Standard: DTC 33 is not output. OK : System OK NG : Check And Replace Air Conditioning Amplifier

Note. For complete System Wiring Diagrams, see SYSTEM WIRING DIAGRAMS .

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1. Inspect Air Conditioning Amplifier (TPDR, SG) Remove the A/C amplifier with the connectors being connected. Turn the ignition switch to ON. Change the set temperature to activate the air mix damper, and measure the voltage between terminal TPDR and SG of the A/C amplifier. Voltage: MAX. COLD: 3.5 - 4.5 V MAX. HOT: 0.5 - 1.8 V NOTE: As the set temperature increases, the voltage decreases gradually without interruption. OK : Proceed To Next Circuit Inspection Shown On Problem Symptoms Table NG : Go To Next Step
2. Inspect Damper Servo Sub-Assy Remove the damper servo sub-assy. Measure resistance between terminal 1 and 2 of the damper servo sub-assy connector. Resistance: 4.2 - 7.8 kohm While operating damper servo sub-assy as shown in the procedure on «DTC 46 AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT (DRIVER SIDE)»(ref-190085-S16638158402005091300000) , measure resistance between terminal 1 and 3 of damper servo sub-assy. Resistance: MAX. COLD: 3.4 - 6.2 kohm MAX. HOT: 0.8 - 1.6 kohm NOTE: As the damper servo sub-assy moves from COLD side to HOT side, the resistance decreases gradually without interruption. NG : Replace Damper Servo Sub-Assy OK : Go To Next Step
3. Check Harness And Connector (Between Air Mix Damper Position Sensor And Air Conditioning Amplifier) Check for open and short circuit in the harness and the connector between the damper servo sub-assy (air mix damper position sensor) and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-190050-S42441265552005091300000) NG : Repair Or Replace Harness Or Connector OK : Go To Next Step
4. Check Diagnostic Trouble Code Start up the DTC check mode Check that DTC 36 is not output again. Standard: DTC 36 is not output. OK : System OK NG : Check And Replace Air Conditioning Amplifier

Note. For complete System Wiring Diagrams, see SYSTEM WIRING DIAGRAMS .

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1. Perform Actuator Check Operate A/C control panel to enter the actuator check mode (See «PRE-CHECK»(ref-190085-S30534238632005091300000) ). Press the DEF switch to enter the step operation. Check the air flow temperature by hand. Standard: DISPLAY CODE Display Code Air Mix Damper Operation 0 COLD side (0 % open) 1 COLD side (0 % open) 2 COLD side (0 % open) 3 COLD/HOT (50 % open) 4 COLD/HOT (50 % open) 5 COLD/HOT (50 % open) 6 HOT side (100 % open) 7 HOT side (100 % open) 8 HOT side (100 % open) 9 HOT side (100 % open) OK : Proceed To Next Circuit Inspection Shown On Problem Symptoms Table NG : Go To Next Step
2. Inspect Damper Servo Sub-Assy Remove the damper servo sub-assy (LH). Connect the battery positive (+) lead to terminal 4 and the battery negative (-) lead to terminal 5, then check that the lever turns to "COLD" side smoothly. Connect the battery positive (+) lead to terminal 5 and the battery negative (-) lead to terminal 4, then check that the lever turns to "HOT" side smoothly. Standard: Motor operates is smoothly. NG : Replace Damper Servo Sub-Assy OK : Go To Next Step
3. Check Harness And Connector (Between Damper Servo Sub-Assy And Air Conditioning Amplifier) Check for open and short circuit in the harness and the connector between the damper servo sub-assy (air mix damper control servomotor) and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-190050-S42441265552005091300000) ). NG : Repair Or Replace Harness Or Connector OK : Go To Next Step
4. Check Diagnostic Trouble Code Start up the DTC check mode. Check that DTC 41 is not output again. Standard: DTC 41 is not output. OK : System OK NG : Check And Replace Air Conditioning Amplifier

Note. For complete System Wiring Diagrams, see SYSTEM WIRING DIAGRAMS .

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1. Perform Actuator Check Remove the glove compartment to see and check the recirculation damper operation. Operate A/C control panel to enter the actuator check mode (See «PRE-CHECK»(ref-190085-S30534238632005091300000) ). Press the DEF switch and change it to step operation. Press the DEF switch in order, and visually check the recirculation damper operation. Standard: DISPLAY CODE Display code Recirculation damper position 0 RECIRCULATION 1 RECIRCULATION 2 FRESH/RECIRCULATION 3 FRESH/RECIRCULATION 4 FRESH 5 FRESH 6 FRESH 7 FRESH 8 FRESH 9 FRESH OK : Proceed To Next Circuit Inspection Shown On Problem Symptoms Table NG : Go To Next Step
2. Inspect Blower Damper Servo Sub-Assy Remove the blower damper servo sub-assy. Connect the battery positive (+) lead to terminal 4 and the battery negative (-) lead to terminal 5, then check that the lever turns to "RECIRCULATION" side smoothly. Connect the battery positive (+) lead to terminal 5 and the battery negative (-) lead to terminal 4, then check that the lever turns to "FRESH" side smoothly. Standard: Motor operates smoothly. NG : Replace Blower Damper Servo Sub-Assy OK : Go To Next Step
3. Check Harness And Connector (Between Blower Damper Servo Sub-Assy And Air Conditioner Amplifier Assy) Check for open and short circuit in the harness and the connector between the blower damper servo sub-assy (air inlet damper control servomotor) and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-190050-S42441265552005091300000) ). NG : Repair Or Replace Harness Or Connector OK : Go To Next Step
4. Check Diagnostic Trouble Code Start up the DTC check mode. Check that DTC 42 is not output again. Standard: DTC 42 is not output. OK : System OK NG : Check And Replace Air Conditioning Amplifier

Note. For complete System Wiring Diagrams, see SYSTEM WIRING DIAGRAMS .

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1. Perform Actuator Check Warm up engine. Operate A/C control panel to enter actuator check mode (See «PRE-CHECK»(ref-190085-S30534238632005091300000) ). Press the DEF switch to enter the step operation. Press the DEF switch, and check the air flow by hand. Standard: DISPLAY CODE Display Code Air Flow Condition 0 FACE 1 FACE 2 B/L 3 B/L 4 FOOT 5 FOOT 6 FOOT 7 FOOT 8 FOOT/DEF 9 DEF OK : Proceed To Next Circuit Inspection Shown On Problem Symptoms Table NG : Go To Next Step
2. Inspect Mode Damper Servo Sub-Assy Remove the mode damper servo sub-assy. Connect the battery positive (+) lead to terminal 4 and the battery negative (-) lead to terminal 5, then check that the lever turns to "DEF" position smoothly. Connect the battery positive (+) lead to terminal 5 and the battery negative (-) lead to terminal 4, then check that the lever turn to "FACE" position smoothly. Standard: Motor operates is smoothly. NG : Replace Mode Damper Servo Sub-Assy OK : Go To Next Step
3. Check Harness And Connector (Between Mode Damper Servo Sub-Assy And Air Conditioning Amplifier) Check for open and short circuit in the harness and the connector between the mode damper servo sub-assy (air outlet damper control servomotor) and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-190050-S42441265552005091300000) ). NG : Repair Or Replace Harness Or Connector OK : Go To Next Step
4. Check Diagnostic Trouble Code Start up the DTC check mode. Check that DTC 43 is not output again. Standard: DTC 43 is not output. NG : System OK NG : Check And Replace Air Conditioning Amplifier

Note. For complete System Wiring Diagrams, see SYSTEM WIRING DIAGRAMS .

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1. Perform Actuator Check Operate A/C control panel to enter the actuator check mode (See «PRE-CHECK»(ref-190085-S30534238632005091300000) ). Press the DEF switch and change to step operation. Check the air flow temperature by hand. Standard: DISPLAY CODE Display Code Air Mix Damper Operation 0 COLD side (0 % open) 1 COLD side (0 % open) 2 COLD side (0 % open) 3 COLD/HOT (50 % open) 4 COLD/HOT (50 % open) 5 COLD/HOT (50 % open) 6 COLD/HOT (50 % open) 7 HOT side (100 % open) 8 HOT side (100 % open) 9 HOT side (100 % open) OK : Proceed To Next Circuit Inspection Shown On Problem Symptoms Table NG : Go To Next Step
2. Inspect Damper Servo Sub-Assy Remove the damper servo sub-assy. Connect the battery positive (+) lead to terminal 4 and the battery negative (-) lead to terminal 5, then check that the lever turns to "COLD" side smoothly. Connect the battery positive (+) lead to terminal 5 and the battery negative (-) lead to terminal 4, then check that the lever turns to "HOT" side smoothly. Standard: Motor operates smoothly. NG : Replace Damper Servo Sub-Assy OK : Go To Next Step
3. Check Harness And Connector (Between Damper Servo Sub-Assy And Air Conditioning Amplifier) Check for open and short in the harness and the connector between the damper servo sub-assy (air mix damper control servomotor) and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-190050-S42441265552005091300000) ). NG : Repair Or Replace Harness Or Connector OK : Go To Next Step
4. Check Diagnostic Trouble Code Start up the DTC check mode. Check that DTC 46 is not output again. Standard: DTC 46 is not output. OK : System OK NG : Check And Replace Air Conditioning Amplifier

Note. For complete System Wiring Diagrams, see SYSTEM WIRING DIAGRAMS .

Scheme 116

Scheme 117

Scheme 118

Scheme 119

1. Check Fuse (IG1) Remove the IG1 fuse from the driver side J/B. Check that continuity exists in the IG1 fuse. Standard: Continuity exists. NG : Replace Fuse OK : Go To Next Step
2. Check Harness And Connector (Between Air Conditioning Amplifier And Battery) Disconnect the "A16" connector from the A/C amplifier. Turn the ignition switch to ON. Measure voltage between terminal IG+ of the A/C amplifier and body ground. Voltage: 10 - 14 V NG : Repair Or Replace Harness Or Connector OK : Go To Next Step
3. Check Harness And Connector (Between Air Conditioning Amplifier And Body Ground) Disconnect the "A16" connector from the A/C amplifier assy. Measure resistance between terminal GND of the A/C amplifier and body ground. Resistance: Below 1.0 ohm (Continuity) NG : Repair Or Replace Harness Or Connector OK : Proceed To Next Circuit Inspection Shown On Problem Symptoms Table

Note. For complete System Wiring Diagrams, see SYSTEM WIRING DIAGRAMS .

Scheme 120

Scheme 121

Scheme 122

1. Check Fuse (ECU-B) Remove the ECU-B fuse from the engine room R/B. Check that the continuity exists of ECU-B fuse. Standard: Continuity exists. NG : Replace Fuse OK : Go To Next Step
2. Check Harness And Connector (Between Air Conditioning Amplifier And Battery) Disconnect the "A16" connector from the A/C amplifier assy. Measure voltage between terminal +B of the A/C amplifier assy and body ground. Voltage: 10 - 14 V NG : Repair Or Replace Harness Or Connector OK : Proceed To Next Circuit Inspection Shown On Problem Symptoms Table

Note. For complete System Wiring Diagrams, see SYSTEM WIRING DIAGRAMS .

Scheme 123

Scheme 124

Scheme 125

Scheme 126

Scheme 127

1. Check Fuse (HTR) Remove the HTR fuse from the engine room R/B. Check that the continuity exists in the HTR fuse. Standard: Continuity exists. NG : Replace Fuse OK : Go To Next Step
2. Inspect Heater Blower Motor Relay Assy Check that the continuity exists between each pair of terminals on the heater blower motor relay assy, as shown in the chart. Standard: TERMINALS CONTINUITY Tester Connection Specified Condition 3 - 5 No continuity 3 - 4 Continuity 1 - 2 62.5 - 90.9 ohm Apply battery voltage between terminal 1 and 2. Check continuity each pair of terminals as shown in the chart. Standard: TERMINALS CONTINUITY Tester Connection Specified Condition 3 - 4 Continuity 3 - 5 No continuity NG : Replace Heater Blower Motor Relay Assy OK : Go To Next Step
3. Check Harness And Connector (Between Heater Blower Motor Relay And Battery) Remove the heater blower motor relay assy from the engine room R/B. Measure voltage between each terminal of engine room R/B and body ground under each condition, as shown in the chart below. Voltage: TERMINALS CONTINUITY Tester Connection Condition Voltage (V) 1 - Body ground Turn ignition switch to ON 10 - 14 V 5 - Body ground Always 10 - 14 V NG : Repair Or Replace Harness Or Connector OK : Go To Next Step
4. Check Harness And Connector (Between Heater Blower Motor Relay And Body Ground) Remove the heater blower motor relay assy from the engine room R/B Measure resistance between terminal 4 of the engine room R/B and body ground. Resistance: Below 1.0 ohm (Continuity) NG : Repair Or Replace Harness Or Connector OK : Go To Next Step
5. Check Harness And Connector (Between Heater Blower Motor Relay And Air Conditioning Amplifier) Check for open and short circuit in the harness and the connector between the heater blower motor relay and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-190050-S42441265552005091300000) NG : Repair Or Replace Harness Or Connector OK : Proceed To Next Circuit Inspection Shown On Problem Symptoms Table

Note. For complete System Wiring Diagrams, see SYSTEM WIRING DIAGRAMS .

Scheme 128

Scheme 129

Scheme 130

Scheme 131

Scheme 132

1. Perform Actuator Check Operate A/C control panel to enter the actuator check mode (See «PRE-CHECK»(ref-190085-S30534238632005091300000) ). Press the blower switch and change to step operation. Check the air flow level by hand. Standard: DISPLAY CODE Display Code Blower level 0 0 (No blower) 1 1 (LO) 2 17 (Medium) 3 17 (Medium) 4 17 (Medium) 5 17 (Medium) 6 17 (Medium) 7 17 (Medium) 8 17 (Medium) 9 31 (HI) OK : Proceed To Next Circuit Inspection Shown On Problem Symptoms Table NG : Go To Next Step
2. Check Fuse (HTR No. 2) Remove the HTR No. 2 fuse from the engine room R/B. Check that the continuity exists in the HTR No. 2 fuse. Standard: Continuity exists. NG : Replace Fuse OK : Go To Next Step
3. Inspect Blower W/Fan Motor Sub-Assy Remove the blower w/ fan motor sub-assy. Connect the battery positive (+) lead to terminal 2 and the battery negative (-) lead to terminal 1. Standard: Blower motor operates smoothly. NG : Replace Blower W/Fan Motor Sub-Assy OK : Go To Next Step
4. Check Harness And Connector (Between Heater Blower Motor Relay And Blower Motor Control) Check for open and short circuit in the harness and the connector between the blower motor relay and the blower motor control (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-190050-S42441265552005091300000) NG : Repair Or Replace Harness Or Connector OK : Go To Next Step
5. Check Harness And Connector (Between Blower Motor Control And Body Ground) Check for open and short circuit in the harness and the connector between the blower motor control and body ground (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-190050-S42441265552005091300000) ). NG : Repair Or Replace Harness Or Connector OK : Go To Next Step
6. Inspect Air Conditioning Amplifier Assy (BLW) Remove the A/C amplifier with the connectors being connected. Turn the ignition switch to ON. Set blower speed to LO. Check the waveform between terminal BLW of the A/C amplifier and body ground. Standard: The correct waveform appears as shown in the illustration. NG : Check And Replace Air Conditioning Amplifier Assy OK : Go To Next Step
7. Check Harness Or Connector (Between Blower Motor Control And Air Conditioning Amplifier) Check for open and short circuit in the harness and the connector between the blower motor control and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-190050-S42441265552005091300000) ). NG : Repair Or Replace Harness Or Connector OK : Replace Blower Motor Control

Note. For complete System Wiring Diagrams, see SYSTEM WIRING DIAGRAMS .

Scheme 133

Scheme 134

Scheme 135

Scheme 136

Scheme 137

Scheme 138

Scheme 139

1. Read Value Of Hand-Held Tester Connect the hand-held tester to the DLC3. Turn the ignition switch ON and push the hand-held tester main SW ON. Check the A/C magnet clutch input signal using DATA LIST. ECM: ECM DATA LIST Description Tester Display Check Condition Magnet clutch input signal A/C SIG ON - OFF NG : Go to step 7 OK : Go To Next Step
2. Inspect Cooler Relay Assy Remove the cooler relay assy from the engine room J/B. Check continuity between each pair of terminals as shown in the chart. Standard: TERMINALS CONTINUITY Tester Connection Specified Condition 1 - 2 Continuity 3 - 5 No continuity Apply battery voltage between terminal 1 and 2. Check that continuity exists between terminal 3 and 5. Standard: Continuity exists. NG : Replace Cooler Relay Assy OK : Go To Next Step
3. Read Value Of Hand-Held Tester Connect the hand-held tester to DLC3. Turn the ignition switch ON and push the hand-held tester main SW ON. Check the A/C magnet clutch using DATA LIST. ECM: ECM DATA LIST Description Tester Display Check Condition Magnet clutch output signal A/C MAG CLUTCH ON - OFF NG : Go to step 9 OK : Go To Next Step
4. Inspect Magnet Clutch Assy Disconnect the connector from the compressor. Connect the battery positive (+) lead to terminal 3 and the battery negative (-) lead to terminal body ground, then check that the magnetic clutch is engaged. Standard: Magnetic clutch is engaged. NG : Replace Magnet Clutch Assy OK : Go To Next Step
5. Check Harness And Connector (Between Battery And Cooler Relay Assy) Remove the cooler relay assy from the engine room R/B. Turn the ignition switch to ON. Measure voltage between terminal 5, 6 of the engine room J/B and body ground. Voltage: 10 - 14 V NG : Repair Or Replace Harness Or Connector OK : Go To Next Step
6. Check Harness And Connector (Between Cooler Relay Assy And Body Ground) Remove the cooler relay assy from the engine room R/B. Measure resistance between terminal 3 of the engine room R/B and body ground. Resistance: Below 1.0 ohm (Continuity) NG : Repair Or Replace Harness Or Connector OK : Proceed To Next Circuit Inspection Shown On Problem Symptoms Table
7. Inspect Air Conditioning Amplifier (ACS, THE) Remove the A/C amplifier with the connectors being connected. Start the engine and push AUTO switch. Measure voltage between terminal THE and ACS of the A/C amplifier and body ground when the magnetic clutch is turned ON and OFF by operating the A/C switch. Voltage: VOLTAGE SPECIFICATION CONDITION Switch Operation Tester Connection Specified Condition ON THE - Body ground 1.3 - 2.6 V OFF THE - Body ground 3.7 - 4.5 V ON ACS - Body ground 10 - 14 V OFF ACS - Body ground Below 1 V NG : Check And Replace Air Conditioning Amplifier OK : Go To Next Step
8. Check Harness And Connector Check for open and short circuit in the harness and the connector between ECM and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-190050-S42441265552005091300000) ). NG : Repair Or Replace Harness Or Connector OK : Check And Replace ECM
9. Check Harness And Connector Disconnect the "E7" connector from ECM. Turn the ignition switch to ON. Measure voltage between terminal ACMG of ECM and body ground. Voltage: 10 - 14 V NG : Repair Or Replace Harness Or Connector OK : Check And Replace ECM

Note. For complete System Wiring Diagrams, see SYSTEM WIRING DIAGRAMS .

Scheme 140

Scheme 141

Scheme 142

1. Inspect Air Conditioning Amplifier (SPD) Remove the A/C amplifier assy with the connector being connected. Shift the shift lever to neutral. Lift up the vehicle. Turn the ignition switch to ON. Measure voltage between terminal SPD of the A/C amplifier assy connector and body ground when turning the rear wheel slowly. Standard: Voltage is generated intermittently. OK : Proceed To Next Circuit Inspection Shown On Problem Symptoms Table NG : Go To Next Step
2. Check Harness And Connector (Between Combination Meter Assy And Air Conditioning Amplifier) Check for open and short circuit in the harness and the connector between the combination meter assy and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-190050-S42441265552005091300000) ). NG : Repair Or Replace Harness Or Connector OK : Check And Replace Combination Meter Assy

Note. For complete System Wiring Diagrams, see SYSTEM WIRING DIAGRAMS .

Scheme 143

Scheme 144

Scheme 145

1. Check Harness And Connector (Between Air Conditioning Control Assy And Battery) Disconnect the connector form air conditioning control panel assy. Check voltage (B, +IG). Measure voltage between terminal B of the air conditioning control panel assy and body ground. Voltage: 10 - 14 V Turn the ignition switch to ON, and measure voltage between terminal IG+ of the air conditioning control panel assy and body ground. Voltage: 10 - 14 V NG : Repair Or Replace Harness Or Connector OK : Go To Next Step
2. Check Harness And Connector (Between Air Conditioning Control Assy And Body Ground) Disconnect the connector form the air conditioning control panel assy. Measure resistance between terminal GND of the air conditioning control panel assy and body ground. Resistance: Below 1.0 ohm (Continuity) NG : Repair Or Replace Harness Or Connector OK : Proceed To Next Circuit Inspection Shown On Problem Symptoms Table

Note. For complete System Wiring Diagrams, see SYSTEM WIRING DIAGRAMS .

Scheme 146