Electronic Stability Program: 4F-28
DTC 1020: Master Cylinder Pressure Sensor Power Supply Failure
S5JB0E4604028
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
1) Turn ignition switch to OFF position.
2) Check for proper connection from harness to ESP® control module.
3) If OK, substitute an ESP® hydraulic unit / control module assembly with correct part number.
4) Recheck system.
DTC C1021, C1022 / C1025, C1026 / C1031, C1032 / C1035, C1036: Right-Front / Left-Front / Right-
Rear / Left-Rear Wheel Speed Sensor Circuit or Encoder Failure
S5JB0E4604014
Refer to “DTC C1021, C1022 / C1025, C1026 / C1031, C1032 / C1035, C1036: Right-Front / Left-Front / Right-Rear /
Left-Rear Wheel Speed Sensor Circuit or Encoder Failure: in Section 4E”.
DTC C1024: Steering Angle Sensor Circuit Failure
S5JB0E4604029
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
5 Check brake fluid level switch circuit
1) Disconnect BCM connector.
2) Check for proper connection to BCM connector at “G31-
7” terminal.
3) If OK, then check resistance between “G31-7” terminal
and vehicle body ground.
Is resistance infinity?
Go to Step 6. “BLKL/RED” wire circuit
is shorted to ground.
6 Check BCM
1) Connect brake fluid level switch connector and BCM
connector.
2) Check voltage at “G31-7” terminal of BCM referring to
“Inspection of BCM and its Circuits: in Section 10B in
related manual”.
Is voltage in good condition?
Substitute a known-
good ESP® hydraulic
unit / control module
assembly and recheck.
Check BCM power and
ground circuit. If circuit
is OK, substitute a
known-good BCM and
recheck.
Step Action Yes No
DTC Detecting Condition Trouble Area
Power supply voltage to master cylinder pressure sensor
in ESP® hydraulic unit / control module assembly is too
low.
• ESP® control module
DTC Detecting Condition Trouble Area
• Steering angle sensor internal defect is detected by
CPU in steering angle sensor.
• Steering angle sensor signal is out of specified range.
• Steering angle sensor
• ESP® control module
Step Action Yes No
1 Was “Electronic Stability Program Check” performed? Go to Step 2. Go to “Electronic
Stability Program
Check: ”.
2 DTC check for ESP®
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Turn ignition switch ON and check DTC for ESP®.
Are DTC C1037, U1073 and/or U1126 detected?
Go to applicable DTC
diag. flow.
Go to Step 3.
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