C1741

SUSPENSION CONTROL: AIR SUSPENSION SYSTEM: C1741/41: Air Suspension Relay Circuit

DTC C1741/41 - Air Suspension Relay Circuit

DESCRIPTION

The signal from the suspension control ECU switches ON the AIR SUS relay, and then the height control compressor motor starts.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. RECONFIRM DTC
(a) Check DTCs .
(1) Confirm if the DTC C1761/61 and/or C1774/74 is recorded.
OK:
DTC C1761/61 and/or C1774/74 is not output.
HINT: If either DTCC1761/61 (ECU malfunction) C1761 or C1774/74 (power source circuit) C1774 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.

NG -- REPAIR CIRCUIT INDICATED BY OUTPUT CODE
OK -- Continue to next step.
2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER
HINT: When not using intelligent tester, go to step 3.
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch to the ON position, and push the intelligent tester main switch ON.
(c) Select the item below in the ACTIVE TEST, and operate it with the intelligent tester.
AIRSUS:





(d) Check the operation sound of the AIR SUS relay when operating it with the intelligent tester.
OK:
The operation sound of the AIR SUS relay can be head.
NG -- INSPECT AIR SUS RELAY
OK -- REPLACE SUSPENSION CONTROL ECU
3. INSPECT AIR SUS RELAY





(a) Remove the AIR SUS relay from the engine room R/B.
(b) Remove the AIR SUS relay from the engine room R/B.
Standard resistance:






NG -- REPLACE AIR SUS RELAY
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - AIR SUS RELAY)





(a) Disconnect the suspension control ECU S14 connector.
(b) Measure the resistance according to the values in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (AIR SUS RELAY - BODY GROUND)





(a) Measure the resistance according to the values in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE SUSPENSION CONTROL ECU