Electronic Stability Program: 4F-26
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
[A]: ESP® control module connector (viewed from terminal side) 3. Junction block assembly 7. CAN driver
[B]: ECM connector (viewed from harness side) 4. Stop lamp switch 8. ESP® hydraulic unit control module assembly
1. Battery 5. Stop lamp
2. Main fuse box 6. ECM
DTC Detecting Condition Trouble Area
Vehicle behavior and stop lamp switch signal is disagreed
for specified time.
• Back up light switch circuit
• Back up light switch
•ECM
• 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®.
Is DTC U1073 and/or U1100 detected?
Go to applicable DTC
diag. flow.
Go to Step 3.
3 Check stop lamp switch
1) Check stop lamp (brake pedal) switch referring to “Stop
(Brake) Lamp Switch Inspection: in Section 9B in
related manual”.
Is it in good condition?
Go to Step 4. Replace stop lamp
switch.
4 Check stop lamp switch circuit
1) Disconnect connector from stop lamp switch connector
with ignition switch turned OFF.
2) Check for proper connection to switch connector.
3) If connection are OK, measure voltage between “GRN”
wire terminal of stop lamp switch connector and vehicle
body ground.
Is it 10 – 14 V?
Go to Step 5. Replace fuse and/or
repair “GRN” wire
circuit.
5 Check stop lamp switch circuit
1) Disconnect connectors from ECM.
2) Check for proper connection to “E23-20” wire of ECM
connector.
3) If connections are OK, check stop lamp switch circuit for
the following.
• Resistance of “GRN/WHT” wire terminal of stop lamp
switch between stop lamp switch connector and ECM
connector is less than 1Ω (continuity check)
• Resistance between “GRN/WHT” wire terminal of stop
lamp switch connector and vehicle body ground is
infinity (ground short check)
• Voltage of between “GRN/WHT” wire terminal of stop
switch connector and vehicle body ground is 0 V with
ignition switch tuned ON (power short check)
Is it in good condition?
Substitute a known-
good ECM and recheck.
If DTC C1016 is still
detected, substitute a
known-good ESP®
hydraulic unit / control
module assembly and
recheck.
Repair or replace
defective wire.
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