DTC C1737/31: Right Front Height Control Solenoid Valve Circuit; DTC C1738/32: Left Front Height Control Solenoid Valve Circuit; DTC C1739/33: Right Rear Height Control Solenoid Valve Circuit; DTC C1740/34: Left Rear Height Control Solenoid Valve Circuit: Procedure
- RECONFIRM DTC
- Check DTCs. Refer to DTC CHECK / CLEAR
.
- Confirm if the DTC C1761/61 and/or C1774/74 is recorded.
OK
DTC C1761/61 and/or C1774/74 is output.
HINT:
If either DTCC1761/61 (ECU malfunction). Refer to DTC C1761/61: ECU Malfunction or C1774/74 (power source circuit). Refer to DTC C1774/74: Power Source Circuit is displayed, carry out the necessary inspection. If they are output at the same time, carry out the necessary inspection for DTC C1774/74 first.
- Confirm if the DTC C1761/61 and/or C1774/74 is recorded.
NG → REPAIR CIRCUIT INDICATED BY OUTPUT CODE
OK: Go to next step
- Check DTCs. Refer to DTC CHECK / CLEAR
.
- PERFORM ACTIVE TEST USING TECHSTREAM
HINT:
When not using Techstream, go to step 3.
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON position, and push the Techstream main switch on.
- Select the item below in the ACTIVE TEST, and operate it with the Techstream.
Air suspension
Item Vehicle Condition / Test Details Diagnostic Note FR Solenoid Turn OFF right front solenoid valve one second after turning it ON Operation of solenoid (clicking sound) can be heard FL Solenoid Turn OFF left front solenoid valve one second after turning it ON Operation of solenoid (clicking sound) can be heard RR Solenoid Turn OFF right rear solenoid valve one second after turning it ON Operation of solenoid (clicking sound) can be heard RL Solenoid Turn OFF left rear solenoid valve one second after turning it ON Operation of solenoid (clicking sound) can be heard - Check whether the height control solenoid valve has continuity (will vibrate).
OK
The solenoid makes sound, and the height control solenoid valve has continuity (will vibrate).
NG → Go to next step
OK → REPLACE SUSPENSION CONTROL ECU
- INSPECT HEIGHT CONTROL SOLENOID VALVE
- HEIGHT CONTROL SOLENOID VALVE FRONT:
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- Disconnect the height control solenoid valve connector.
- Measure the resistance according to the values in the table below.
Standard resistance (RH): (C1737/31)
Tester Connection Specified Condition 2 (E) - 3 (RH+) 12 +- 2 Ω Standard resistance (LH): (C1738/32)
Tester Connection Specified Condition 1 (LH+) - 2 (E) 12 +- 2 Ω - Check the operating sound of the height control solenoid valve when positive battery voltage is applied to the terminals.RH: (C1737/31)
Battery Positive Battery Negative 3 (RH+) 2 (E) LH: (C1738/32)Battery Positive Battery Negative 1 (LH+) 2 (E) OK
It should make an operating sound (click).
Result
Result Proceed to OK A NG B HINT:
When a malfunction is found in the front solenoid valve, replace the height control valve sub-assembly No. 1.
- HEIGHT CONTROL SOLENOID VALVE REAR:
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- Disconnect the height control solenoid valve connector.
- Measure the resistance according to the values in the table below.
Standard resistance (RH): (C1739/33)
Tester Connection Specified Condition 1 (RH+) - 2 (E) 12 +- 2 Ω Standard resistance (LH): (C1740/34)
Tester Connection Specified Condition 2 (E) - 3 (LH+) 12 +- 2 Ω Standard resistance
12 +- 2 Ω
- Check the operating sound of the height control solenoid valve when positive battery voltage is applied to the terminals.RH: (C1739/39)
Battery Positive Battery Negative 1 (RH+) 2 (E) LH: (C1740/34)Battery Positive Battery Negative 3 (LH+) 2 (E) OK
It should make an operating sound (click).
Result
Result Proceed to OK A NG C HINT:
When a malfunction is found in the front solenoid valve, replace the height control valve sub-assembly No. 2.
C → REPLACE HEIGHT CONTROL VALVE SUB-ASSEMBLY NO. 2
B → REPLACE HEIGHT CONTROL VALVE SUB-ASSEMBLY NO. 1
A: Go to next step
- HEIGHT CONTROL SOLENOID VALVE FRONT:
- CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - HEIGHT CONTROL SOLENOID VALVE)
- Disconnect the suspension control ECU S14 connector.
- Measure the resistance according to the values in the table below.
Standard resistance (Front RH): (C1737/31)
Tester Connection Specified Condition S14-9 (SLFR) - H14-3 (RH+) Below 1 Ω S14-9 (SLFR) - Body ground 10 kΩ or higher Standard resistance (Front LH): (C1738/32)
Tester Connection Specified Condition S14-10 (SLFL) - H14-1 (LH+) Below 1 Ω S14-10 (SLFL) - Body ground 10 kΩ or higher Standard resistance (Rear RH): (C1739/33)
Tester Connection Specified Condition S14-2 (SLRR) - H27-1 (RH+) Below 1 Ω S14-2 (SLRR) - Body ground 10 kΩ or higher Standard resistance (Rear LH): (C1740/34)
Tester Connection Specified Condition S14-1 (SLRL) - H27-3 (LH+) Below 1 Ω S14-1 (SLRL) - Body ground 10 kΩ or higher
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to next step
- CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL SOLENOID VALVE - BODY GROUND)
- Measure the resistance according to the values in the table below.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Standard resistance (Front RH): (C1737/31)
Tester Connection Specified Condition H14-3 (RH+) - Body ground Below 1 Ω Standard resistance (Front LH): (C1738/32)
Tester Connection Specified Condition H14-1 (LH+) - Body ground Below 1 Ω Standard resistance (Rear RH): (C1739/33)
Tester Connection Specified Condition H27-1 (RH+) - Body ground Below 1 Ω Standard resistance (Rear LH): (C1740/34)
Tester Connection Specified Condition H27-3 (LH+) - Body ground Below 1 Ω
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK → REPLACE SUSPENSION CONTROL ECU
- Measure the resistance according to the values in the table below.