Specifications

ON-BOARD DIAGNOSTIC
F157
F
4 INSPECT BRAKE SWITCH CONNECTOR FOR
POOR CONNECTION
• Turn ignition switch to OFF.
• Disconnect brake switch connector.
• Inspect for poor connection (damaged/pulled-
out terminals, corrosion, etc.).
• Is there malfunction?
Yes Repair or replace terminal, then go to Step 14.
No Go to next step.
5 CLASSIFY BRAKE SWITCH OR CIRCUIT
• Connect WDS or equivalent to DLC-2.
• Access BOO PID.
• Connect a jumper wire between brake switch
terminal A and B.
• Is BOO PID on?
Yes Go to next step.
No Go to Step 7.
6 INSPECT BRAKE SWITCH
• Perform brake switch inspection.
(See P8 BRAKE SWITCH INSPECTION.)
• Is brake switch okay?
Yes Go to Step 14.
No Replace brake switch, then go to Step 14.
7 INSPECT BRAKE SWITCH POWER CIRCUIT
FOR OPEN CIRCUIT
• Measure voltage between brake switch
connector terminal B and body ground.
• Is voltage B+?
Yes Go to next step.
No Repair or replace brake switch power circuit for open, then
Go to Step 14.
8 INSPECT PCM CONNECTOR FOR POOR
CONNECTION
• Turn ignition switch to OFF.
• Disconnect PCM connector.
• Inspect for poor connection (damaged/pulled-
out terminals, corrosion, etc.).
• Is there malfunction?
Yes Repair or replace terminal, then go to Step 14.
No Go to next step.
9 INSPECT BRAKE SWITCH SIGNAL CIRCUIT
FOR OPEN CIRCUIT
• Inspect continuity between brake switch
terminal D and PCM terminal 1K.
• Is there any continuity?
Yes Repair or replace harness for open, then go to Step 14.
No Go to Step 14.
10 INSPECT BRAKE SWITCH CONNECTOR FOR
POOR CONNECTION
• Turn ignition switch to OFF.
• Disconnect brake switch connector.
• Inspect for poor connection (damaged/pulled-
out terminals, corrosion, etc.).
• Is there malfunction?
Yes Repair or replace terminal, then go to Step 14.
No Go to next step.
11 CLASSIFY BRAKE SWITCH OR CIRCUIT
• Connect WDS or equivalent to DLC-2.
• Access BOO PID.
• Verify that BOO PID changes from ON to OFF
when brake switch connector disconnected.
• Does BOO PID change from ON to OFF?
Yes Go to next step.
No Go to Step 13.
12 INSPECT BRAKE SWITCH
• Perform brake switch inspection.
(See P8 BRAKE SWITCH INSPECTION.)
• Is brake switch okay?
Yes Go to Step 14.
No Replace brake switch, then go to Step 14.
13 INSPECT BRAKE SWITCH SIGNAL CIRCUIT
FOR SHORT TO POWER
• Measure voltage between brake switch
connector terminal D and body ground.
• Is voltage B+?
Yes Repair or replace harness for short to power, then go to
Step 14.
No Go to next step.
STEP INSPECTION ACTION