Inspection Procedure

1. Connect the intelligent tester to the DLC3.
2. Turn the engine switch on (IG) and turn the intelligent tester main switch on.
3. Select the items below in the DATA LIST, and read the displays on the intelligent tester.

   AFS ECU 

   DATA LIST - AFS ECU
   
   

   Item	Measurement Item / Display (Range)	Normal Condition	Diagnostic Note
   FR HEIGHT SENS	Front height sensor signal value / 0 to 5 V	Approx. 2.5 V	-
   RR HEIGHT SENS	Rear height sensor signal value / 0 to 5 V	Approx. 2.5 V	-

   OK: 

   Condition sign can be displayed. 

Result 

B: REPLACE AFS ECU 

C: Go to step 2 

A: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

1. Disconnect the A20 height control sensor connector.
2. Measure the voltage of the wire harness side connector.

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   A20-1 - A20-3	Engine switch on (IG)	4.5 to 5.5 V

Fig 1: Identifying Height Control Sensor Connector Terminals - Front LH

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG:  Go to step  8

OK: Go to next step 

1. Disconnect the o2 height control sensor connector.
2. Measure the voltage of the wire harness side connector.

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   o2-1 - o2-3	Engine switch on (IG)	4.5 to 5.5 V

Fig 2: Identifying Height Control Sensor Connector Terminals - Rear LH

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG:  Go to step  9

OK: Go to next step 

1. Disconnect the A28 AFS ECU connector.
2. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   A28-2 (SHFL) - A20-2 (SHFL)	Always	Below 1 Ω
   A28-2 (SHFL) - Body ground	Always	10 kΩ or higher

Fig 3: Checking Wire Harness (AFS ECU - Height Control Sensor Front)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: Go to next step 

1. Disconnect the o2 sensor connector.
2. Disconnect the A29 AFS ECU connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   A29-9 (SHRL) - o2-2 (SHFL)	Always	Below 1 Ω
   A29-9 (SHRL) - Body ground	Always	10 kΩ or higher

Fig 4: Checking Wire Harness (AFS ECU - Height Control Sensor Rear)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: Go to next step 

1. Connect the 3 dry cell batteries (1.5 V) in series.
2. Remove the height control sensor assembly front.
3. Connect the positive (+) lead from the battery to terminal 3 and the negative (-) lead from the battery to terminal 1.
4. Measure the voltage between terminals 2 and 1 while slowly moving the link up and down.

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   A20-2 (SHFL) - A20-1 (SHG)	+45°	Approx. 4.5 V
   A20-2 (SHFL) - A20-1 (SHG)	0° (Normal)	Approx. 2.5 V
   A20-2 (SHFL) - A20-1 (SHG)	-45° (Low)	Approx. 0.5 V

Fig 5: Inspecting Height Control Sensor (Front LH)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE HEIGHT CONTROL SENSOR (FRONT LH) 

OK: Go to next step 

1. Connect the 3 dry cell batteries (1.5 V) in series.
2. Remove the height control sensor assembly rear.
3. Connect the positive (+) lead from the battery to terminal 3 and the negative (-) lead from the battery to terminal 1.
4. Measure the voltage between terminals 2 and 1 while slowly moving the link up and down.

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   o2-2 (SHFL) - o2-1 (SHG)	+45°	Approx. 4.5 V
   o2-2 (SHFL) - o2-1 (SHG)	0° (Normal)	Approx. 2.5 V
   o2-2 (SHFL) - o2-1 (SHG)	-45° (Low)	Approx. 0.5 V

   Result 

   RESULT REFERENCE
   
   

   OK (When checking from DIAGNOSTICS TROUBLE CODE CHART)	A
   OK (When checking from PROBLEM SYMPTOMS TABLE)	B
   NG	C

Fig 6: Connecting Positive Lead From Battery To Terminal 3 And Negative From Battery To Terminal 1

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

C: REPLACE HEIGHT CONTROL SENSOR (REAR LH) 

A: REPLACE AFS ECU 

1. Measure the voltage of the connector.

Fig 7: Checking AFS ECU

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard voltage 

Result 

B: REPLACE AFS ECU 

C: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

A: REPAIR OR REPLACE HARNESS AND CONNECTOR (AFS ECU - HEIGHT CONTROL SENSOR FRONT) 

1. Measure the voltage of the connector.

Fig 8: Checking AFS ECU

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard voltage 

Result 

B: REPLACE AFS ECU 

C: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

A: REPAIR OR REPLACE HARNESS AND CONNECTOR (AFS ECU - HEIGHT CONTROL SENSOR REAR)