DTC C1020-00: Ignition Switch On/Start Position Malfunction [11/2023 - ]: Procedure
WARNING: This page is about a different variant/trim than selected.
- CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)
- Make sure that there is no looseness at the locking part and the connecting part of the connector.
*a Front view of wire harness connector
(to No. 1 Skid Control ECU (Brake Booster with Master Cylinder Assembly))OK
The connector is securely connected.
- Disconnect the A44 No. 1 skid control ECU (brake booster with master cylinder assembly) connector.
- Check both the connector case and the terminals for deformation and corrosion.
OK
No deformation or corrosion.
- Turn the ignition switch to ON.
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition A44-31 (IG1) - Body ground Ignition switch ON 11 to 14 V Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result:
OK
See step 2
- Make sure that there is no looseness at the locking part and the connecting part of the connector.
- CHECK HARNESS AND CONNECTOR (GND1 TERMINAL)
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition A44-28 (GND1) - Body ground 1 minute or more after disconnecting the cable from the negative (-) auxiliary battery terminal Below 1 Ω Result
Proceed to OK NG
Result:
OK
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to REMOVAL [11/2023 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
- Measure the resistance according to the value(s) in the table below.
